Merge branch 'master' into perspective_correction

Conflicts: src/testing/main.c
2013-06-11 17:35:53 +02:00 · 2013-06-11 17:35:53 +02:00 · feb422cd11
commit feb422cd11
parent a02f82c13a b15ea439d2
45 changed files with 1736 additions and 412 deletions
--- a/2
+++ b/2
@ -1,4 +1,5 @@
 Technology Preview 2 :
+- Implement perspective correction for coordinate mapping of rasterized polygons.
 - Finalize terrain editor.
   => Add a generation dialog for base noise (overwriting changes).
 - Get rid of noise dialogs, for simpler settings.
@ -15,6 +16,7 @@ Technology Preview 2 :

 Technlogy Preview 3 :
 - Start an undo/redo system ?
+- Alter aerial perspective using estimation of the amount of light left after cloud layers traversal.
 - Add a map preview to terrain editor.
 - Better time selection widget for atmosphere.
 - Clouds should keep distance to ground.
--- a/data/ui_pictures.qrc
+++ b/data/ui_pictures.qrc
@ -6,6 +6,9 @@
        <file>images/explore.png</file>
        <file>images/render.png</file>
        <file>images/about.png</file>
+        <file>images/load.png</file>
+        <file>images/new.png</file>
+        <file>images/save.png</file>
    </qresource>
    <qresource prefix="/tabs">
        <file>images/tab_atmosphere.png</file>
@ -15,4 +18,10 @@
        <file>images/tab_textures.png</file>
        <file>images/tab_water.png</file>
    </qresource>
+    <qresource prefix="/logo">
+        <file>images/logo_16.png</file>
+        <file>images/logo_32.png</file>
+        <file>images/logo_64.png</file>
+        <file>images/logo_256.png</file>
+    </qresource>
 </RCC>
--- a/src/editing/common/freeformhelper.cpp
+++ b/src/editing/common/freeformhelper.cpp
@ -2,11 +2,16 @@

 #include <QDialog>
 #include <QVariant>
+#include <QResizeEvent>
+#include <QSlider>
+#include <QPushButton>
 #include <cmath>
+#include <qt4/QtGui/qwidget.h>
 #include "dialogrender.h"
 #include "dialogexplorer.h"
 #include "rendering/scenery.h"
 #include "rendering/renderer.h"
+#include "tools.h"

 Q_DECLARE_METATYPE(double*)

@ -24,8 +29,43 @@ FreeFormHelper::~FreeFormHelper()
 {
 }

+bool FreeFormHelper::eventFilter(QObject* object, QEvent* event)
+{
+    if (event->type() == QEvent::Resize && object == _form_widget)
+    {
+        QSize form_size = ((QResizeEvent*) event)->size();
+        QSize preview_size;
+
+        if (form_size.width() > 1400 && form_size.height() > 900)
+        {
+            preview_size = QSize(300, 300);
+        }
+        else if (form_size.width() < 1000 || form_size.height() < 700)
+        {
+            preview_size = QSize(160, 160);
+        }
+        else
+        {
+            preview_size = QSize(220, 220);
+        }
+
+        for (int i = 0; i < _previews.size(); i++)
+        {
+            if (_previews[i]->size() != preview_size)
+            {
+                _previews[i]->setMinimumSize(preview_size);
+                _previews[i]->setMaximumSize(preview_size);
+                _previews[i]->resize(preview_size);
+            }
+        }
+    }
+    return false;
+}
+
 void FreeFormHelper::startManaging()
 {
+    _form_widget->installEventFilter(this);
+
    connect(this, SIGNAL(needLocalRefreshing()), _form_widget, SLOT(refreshFromLocalData()));
    connect(this, SIGNAL(needGlobalRefreshing()), _form_widget, SLOT(refreshFromFellowData()));
    connect(this, SIGNAL(needReverting()), _form_widget, SLOT(updateLocalDataFromScenery()));
--- a/src/editing/common/freeformhelper.h
+++ b/src/editing/common/freeformhelper.h
@ -1,11 +1,12 @@
 #ifndef FREEFORMHELPER_H
 #define FREEFORMHELPER_H

-#include <QSlider>
-#include <QPushButton>
 #include "widgetsliderdecimal.h"
 #include "../basepreview.h"

+class QSlider;
+class QPushButton;
+
 class FreeFormHelper:public QObject
 {
    Q_OBJECT
@ -57,6 +58,9 @@ public slots:
    void processRenderClicked();
    void processDecimalChange(double value);

+protected:
+    bool eventFilter(QObject* object, QEvent* event);
+
 private:
    QWidget* _form_widget;

--- a/src/editing/common/mainwindow.cpp
+++ b/src/editing/common/mainwindow.cpp
@ -1,10 +1,10 @@
 #include "mainwindow.h"
+#include "ui_mainwindow.h"

 #include <QApplication>
 #include <QMenuBar>
 #include <QMenu>
 #include <QIcon>
-#include <QToolBar>
 #include <QFileDialog>
 #include <QTabWidget>
 #include <QTranslator>
@ -64,6 +64,7 @@ int main(int argc, char** argv)

    window = new MainWindow();
    window->show();
+    //window->showMaximized();
    splash->finish(window);

    delete splash;
@ -79,68 +80,60 @@ int main(int argc, char** argv)
 }

 MainWindow::MainWindow(QWidget *parent) :
-QMainWindow(parent)
+    QMainWindow(parent),
+    ui(new Ui::MainWindow)
 {
+    ui->setupUi(this);
+
    BaseForm* form;
-    QTabWidget* tabs;
-    QToolBar* toolbar;

-    tabs = new QTabWidget(this);
-    tabs->setIconSize(QSize(32, 32));
+    connect(ui->action_explore, SIGNAL(triggered()), this, SLOT(explore3D()));
+    connect(ui->action_quick_render, SIGNAL(triggered()), this, SLOT(quickPreview()));
+    connect(ui->action_final_render, SIGNAL(triggered()), this, SLOT(finalRender()));
+    connect(ui->action_file_new, SIGNAL(triggered()), this, SLOT(fileNew()));
+    connect(ui->action_file_save, SIGNAL(triggered()), this, SLOT(fileSave()));
+    connect(ui->action_file_load, SIGNAL(triggered()), this, SLOT(fileLoad()));
+    connect(ui->action_about, SIGNAL(triggered()), this, SLOT(showAboutDialog()));

-    tabs->addTab(new MainTerrainForm(tabs), QIcon(getDataPath("images/tab_terrain.png")), tr("Landscape shape"));
-
-    form = new FormTextures(tabs);
-    tabs->addTab(form, QIcon(getDataPath("images/tab_textures.png")), tr("Textures"));
+    form = new FormTextures(ui->tabs);
+    ui->tabs->addTab(form, QIcon(getDataPath("images/tab_textures.png")), tr("Textures"));
    QObject::connect(form, SIGNAL(configApplied()), this, SLOT(refreshAll()), Qt::QueuedConnection);
    _forms.append(form);

-    form = new FormWater(tabs);
-    tabs->addTab(form, QIcon(getDataPath("images/tab_water.png")), tr("Water"));
+    form = new FormWater(ui->tabs);
+    ui->tabs->addTab(form, QIcon(getDataPath("images/tab_water.png")), tr("Water"));
    QObject::connect(form, SIGNAL(configApplied()), this, SLOT(refreshAll()), Qt::QueuedConnection);
    _forms.append(form);

-    form = new FormAtmosphere(tabs);
-    tabs->addTab(form, QIcon(getDataPath("images/tab_atmosphere.png")), tr("Atmosphere"));
+    form = new FormAtmosphere(ui->tabs);
+    ui->tabs->addTab(form, QIcon(getDataPath("images/tab_atmosphere.png")), tr("Atmosphere"));
    QObject::connect(form, SIGNAL(configApplied()), this, SLOT(refreshAll()), Qt::QueuedConnection);
    _forms.append(form);

-    form = new FormClouds(tabs);
-    tabs->addTab(form, QIcon(getDataPath("images/tab_clouds.png")), tr("Clouds"));
+    form = new FormClouds(ui->tabs);
+    ui->tabs->addTab(form, QIcon(getDataPath("images/tab_clouds.png")), tr("Clouds"));
    QObject::connect(form, SIGNAL(configApplied()), this, SLOT(refreshAll()), Qt::QueuedConnection);
    _forms.append(form);

-    _form_render = new FormRender(tabs);
-    tabs->addTab(_form_render, QIcon(getDataPath("images/tab_render.png")), tr("Render"));
+    _form_render = new FormRender(ui->tabs);
+    ui->tabs->addTab(_form_render, QIcon(getDataPath("images/tab_render.png")), tr("Render"));
    _forms.append(_form_render);

-    toolbar = new QToolBar(this);
-    toolbar->setOrientation(Qt::Vertical);
-    toolbar->setAllowedAreas(Qt::LeftToolBarArea);
-    toolbar->setMovable(false);
-    toolbar->setFloatable(false);
-    toolbar->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
-    toolbar->toggleViewAction()->setEnabled(false);
-    toolbar->setIconSize(QSize(32, 32));
-    addToolBar(Qt::LeftToolBarArea, toolbar);
-
-    toolbar->addAction(QIcon(getDataPath("images/new.png")), tr("&New"), this, SLOT(fileNew()))->setShortcut(QKeySequence(tr("Crtl+N")));
-    toolbar->addAction(QIcon(getDataPath("images/save.png")), tr("&Save"), this, SLOT(fileSave()))->setShortcut(QKeySequence(tr("Crtl+S")));
-    toolbar->addAction(QIcon(getDataPath("images/load.png")), tr("&Load"), this, SLOT(fileLoad()))->setShortcut(QKeySequence(tr("Crtl+L")));
-    toolbar->addAction(QIcon(getDataPath("images/explore.png")), tr("&Explore (F2)"), this, SLOT(explore3D()))->setShortcut(QKeySequence(tr("F2")));
-    toolbar->addAction(QIcon(getDataPath("images/render.png")), tr("&Quick\nrender (F5)"), this, SLOT(quickPreview()))->setShortcut(QKeySequence(tr("F5")));
-    toolbar->addAction(QIcon(getDataPath("images/about.png")), tr("&About"), this, SLOT(showAboutDialog()));
-
-    setCentralWidget(tabs);
-
-    setWindowTitle("Paysages 3D");
-    setWindowIcon(QIcon(getDataPath("images/logo_32.png")));
+    // TODO Decide this according to platform / screen size
+    //ui->toolBar->hide();
+    ui->tool_panel->hide();
+    ui->menuBar->hide();

    scenerySetCustomDataCallback(MainWindow::guiSaveCallback, MainWindow::guiLoadCallback, this);

    refreshAll();
 }

+MainWindow::~MainWindow()
+{
+    delete ui;
+}
+
 bool MainWindow::event(QEvent* event)
 {
    if (event->type() == QEvent::WindowActivate)
@ -160,6 +153,7 @@ void MainWindow::refreshAll()
    {
        _forms[i]->revertConfig();
    }
+    // TODO Refresh free forms

    // Refresh preview OSD
    CameraDefinition* camera = cameraCreateDefinition();
@ -244,6 +238,16 @@ void MainWindow::quickPreview()
    _form_render->startQuickRender();
 }

+void MainWindow::finalRender()
+{
+    _form_render->startRender();
+}
+
+void MainWindow::showLastRender()
+{
+    _form_render->showRender();
+}
+
 void MainWindow::explore3D()
 {
    CameraDefinition* camera;
--- a/src/editing/common/mainwindow.h
+++ b/src/editing/common/mainwindow.h
@ -1,16 +1,25 @@
-#ifndef _PAYSAGES_QT_MAINWINDOW_H_
-#define _PAYSAGES_QT_MAINWINDOW_H_
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H

 #include <QMainWindow>
-#include "formrender.h"
+#include <QVector>
 #include "rendering/tools/pack.h"

+class BaseForm;
+class FormRender;
+
+namespace Ui {
+class MainWindow;
+}
+
 class MainWindow : public QMainWindow
 {
    Q_OBJECT
    
 public:
    explicit MainWindow(QWidget *parent = 0);
+    ~MainWindow();
+
    virtual bool event(QEvent* event);

    static void guiSaveCallback(PackStream* stream, void* data);
@ -26,9 +35,14 @@ public slots:
    void showAboutDialog();

    void quickPreview();
+    void finalRender();
+    void showLastRender();
+
    void explore3D();

 private:
+    Ui::MainWindow *ui;
+
    void guiSave(PackStream* stream);
    void guiLoad(PackStream* stream);

@ -36,4 +50,4 @@ private:
    FormRender* _form_render;
 };

-#endif
+#endif // MAINWINDOW_H
--- a/src/editing/common/mainwindow.ui
+++ b/src/editing/common/mainwindow.ui
@ -0,0 +1,572 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>946</width>
+    <height>651</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Paysages 3D</string>
+  </property>
+  <property name="windowIcon">
+   <iconset resource="../../../data/ui_pictures.qrc">
+    <normaloff>:/logo/images/logo_32.png</normaloff>:/logo/images/logo_32.png</iconset>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QHBoxLayout" name="horizontalLayout">
+    <property name="leftMargin">
+     <number>0</number>
+    </property>
+    <property name="topMargin">
+     <number>0</number>
+    </property>
+    <property name="rightMargin">
+     <number>0</number>
+    </property>
+    <property name="bottomMargin">
+     <number>0</number>
+    </property>
+    <item>
+     <widget class="QWidget" name="tool_panel" native="true">
+      <layout class="QVBoxLayout" name="verticalLayout">
+       <item>
+        <widget class="QLabel" name="label">
+         <property name="text">
+          <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;&lt;span style=&quot; font-size:14pt; font-weight:600;&quot;&gt;Paysages 3D&lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;img src=&quot;:/logo/images/logo_32.png&quot;/&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+         </property>
+         <property name="textFormat">
+          <enum>Qt::RichText</enum>
+         </property>
+         <property name="alignment">
+          <set>Qt::AlignCenter</set>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacer_3">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item>
+        <layout class="QHBoxLayout" name="horizontalLayout_2">
+         <item>
+          <widget class="QRadioButton" name="radioButton_3">
+           <property name="text">
+            <string>Preview</string>
+           </property>
+           <property name="checked">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QRadioButton" name="radioButton_2">
+           <property name="text">
+            <string>3D</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QRadioButton" name="radioButton">
+           <property name="text">
+            <string>Top</string>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
+       <item>
+        <widget class="QFrame" name="frame">
+         <property name="frameShape">
+          <enum>QFrame::Panel</enum>
+         </property>
+         <property name="frameShadow">
+          <enum>QFrame::Raised</enum>
+         </property>
+         <property name="lineWidth">
+          <number>3</number>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_2">
+          <property name="spacing">
+           <number>0</number>
+          </property>
+          <property name="sizeConstraint">
+           <enum>QLayout::SetMinimumSize</enum>
+          </property>
+          <property name="leftMargin">
+           <number>0</number>
+          </property>
+          <property name="topMargin">
+           <number>0</number>
+          </property>
+          <property name="rightMargin">
+           <number>0</number>
+          </property>
+          <property name="bottomMargin">
+           <number>0</number>
+          </property>
+          <item>
+           <widget class="QWidget" name="widget" native="true">
+            <property name="minimumSize">
+             <size>
+              <width>200</width>
+              <height>150</height>
+             </size>
+            </property>
+            <property name="maximumSize">
+             <size>
+              <width>400</width>
+              <height>300</height>
+             </size>
+            </property>
+           </widget>
+          </item>
+         </layout>
+         <zorder>widget</zorder>
+         <zorder>widget</zorder>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacer_4">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="groupBox_2">
+         <property name="title">
+          <string>Actions</string>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_3">
+          <item>
+           <widget class="QPushButton" name="button_explore">
+            <property name="text">
+             <string>Explore in 3D</string>
+            </property>
+            <property name="icon">
+             <iconset resource="../../../data/ui_pictures.qrc">
+              <normaloff>:/buttons/logo/images/explore.png</normaloff>:/buttons/logo/images/explore.png</iconset>
+            </property>
+            <property name="shortcut">
+             <string>F2</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="button_render">
+            <property name="text">
+             <string>Render</string>
+            </property>
+            <property name="icon">
+             <iconset resource="../../../data/ui_pictures.qrc">
+              <normaloff>:/buttons/logo/images/render.png</normaloff>:/buttons/logo/images/render.png</iconset>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacer_2">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="groupBox">
+         <property name="title">
+          <string>File</string>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_4">
+          <item>
+           <widget class="QPushButton" name="button_file_new">
+            <property name="text">
+             <string>New</string>
+            </property>
+            <property name="icon">
+             <iconset resource="../../../data/ui_pictures.qrc">
+              <normaloff>:/buttons/logo/images/new.png</normaloff>:/buttons/logo/images/new.png</iconset>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="button_file_save">
+            <property name="text">
+             <string>Save</string>
+            </property>
+            <property name="icon">
+             <iconset resource="../../../data/ui_pictures.qrc">
+              <normaloff>:/buttons/logo/images/save.png</normaloff>:/buttons/logo/images/save.png</iconset>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="button_file_load">
+            <property name="text">
+             <string>Load</string>
+            </property>
+            <property name="icon">
+             <iconset resource="../../../data/ui_pictures.qrc">
+              <normaloff>:/buttons/logo/images/load.png</normaloff>:/buttons/logo/images/load.png</iconset>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
+    </item>
+    <item>
+     <widget class="QTabWidget" name="tabs">
+      <property name="currentIndex">
+       <number>0</number>
+      </property>
+      <property name="iconSize">
+       <size>
+        <width>32</width>
+        <height>32</height>
+       </size>
+      </property>
+      <widget class="MainTerrainForm" name="tab_terrain">
+       <attribute name="icon">
+        <iconset resource="../../../data/ui_pictures.qrc">
+         <normaloff>:/tabs/images/tab_terrain.png</normaloff>:/tabs/images/tab_terrain.png</iconset>
+       </attribute>
+       <attribute name="title">
+        <string>Lanscape shape</string>
+       </attribute>
+      </widget>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+  <widget class="QToolBar" name="toolBar">
+   <property name="windowTitle">
+    <string>toolBar</string>
+   </property>
+   <property name="movable">
+    <bool>false</bool>
+   </property>
+   <property name="allowedAreas">
+    <set>Qt::LeftToolBarArea</set>
+   </property>
+   <property name="iconSize">
+    <size>
+     <width>32</width>
+     <height>32</height>
+    </size>
+   </property>
+   <property name="toolButtonStyle">
+    <enum>Qt::ToolButtonTextUnderIcon</enum>
+   </property>
+   <property name="floatable">
+    <bool>false</bool>
+   </property>
+   <attribute name="toolBarArea">
+    <enum>LeftToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+   <addaction name="action_file_new"/>
+   <addaction name="action_file_save"/>
+   <addaction name="action_file_load"/>
+   <addaction name="separator"/>
+   <addaction name="action_explore"/>
+   <addaction name="action_quick_render"/>
+   <addaction name="action_final_render"/>
+   <addaction name="separator"/>
+   <addaction name="action_about"/>
+  </widget>
+  <widget class="QMenuBar" name="menuBar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>946</width>
+     <height>25</height>
+    </rect>
+   </property>
+   <widget class="QMenu" name="menuFile">
+    <property name="title">
+     <string>File</string>
+    </property>
+    <addaction name="action_file_new"/>
+    <addaction name="action_file_save"/>
+    <addaction name="action_file_load"/>
+   </widget>
+   <widget class="QMenu" name="menuActions">
+    <property name="title">
+     <string>Actions</string>
+    </property>
+    <addaction name="action_explore"/>
+    <addaction name="action_quick_render"/>
+    <addaction name="action_final_render"/>
+    <addaction name="action_last_render"/>
+   </widget>
+   <widget class="QMenu" name="menuHelp">
+    <property name="title">
+     <string>Help</string>
+    </property>
+    <addaction name="action_about"/>
+   </widget>
+   <addaction name="menuFile"/>
+   <addaction name="menuActions"/>
+   <addaction name="menuHelp"/>
+  </widget>
+  <action name="action_explore">
+   <property name="icon">
+    <iconset resource="../../../data/ui_pictures.qrc">
+     <normaloff>:/buttons/logo/images/explore.png</normaloff>:/buttons/logo/images/explore.png</iconset>
+   </property>
+   <property name="text">
+    <string>Explore in 3D</string>
+   </property>
+   <property name="toolTip">
+    <string>Start exploring your scenery in real-time 3D</string>
+   </property>
+   <property name="shortcut">
+    <string>F2</string>
+   </property>
+  </action>
+  <action name="action_file_new">
+   <property name="icon">
+    <iconset resource="../../../data/ui_pictures.qrc">
+     <normaloff>:/buttons/logo/images/new.png</normaloff>:/buttons/logo/images/new.png</iconset>
+   </property>
+   <property name="text">
+    <string>New scene</string>
+   </property>
+   <property name="toolTip">
+    <string>Create a virgin scene</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+N</string>
+   </property>
+  </action>
+  <action name="action_file_load">
+   <property name="icon">
+    <iconset resource="../../../data/ui_pictures.qrc">
+     <normaloff>:/buttons/logo/images/load.png</normaloff>:/buttons/logo/images/load.png</iconset>
+   </property>
+   <property name="text">
+    <string>Load scene</string>
+   </property>
+   <property name="toolTip">
+    <string>Load a scenery from a file</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+O</string>
+   </property>
+  </action>
+  <action name="action_file_save">
+   <property name="icon">
+    <iconset resource="../../../data/ui_pictures.qrc">
+     <normaloff>:/buttons/logo/images/save.png</normaloff>:/buttons/logo/images/save.png</iconset>
+   </property>
+   <property name="text">
+    <string>Save scene</string>
+   </property>
+   <property name="toolTip">
+    <string>Save a scenery to a file</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+S</string>
+   </property>
+  </action>
+  <action name="action_quick_render">
+   <property name="icon">
+    <iconset resource="../../../data/ui_pictures.qrc">
+     <normaloff>:/buttons/logo/images/render.png</normaloff>:/buttons/logo/images/render.png</iconset>
+   </property>
+   <property name="text">
+    <string>Quick render</string>
+   </property>
+   <property name="toolTip">
+    <string>Start a quick render</string>
+   </property>
+   <property name="shortcut">
+    <string>F5</string>
+   </property>
+  </action>
+  <action name="action_final_render">
+   <property name="icon">
+    <iconset resource="../../../data/ui_pictures.qrc">
+     <normaloff>:/buttons/logo/images/render.png</normaloff>:/buttons/logo/images/render.png</iconset>
+   </property>
+   <property name="text">
+    <string>Final render</string>
+   </property>
+   <property name="toolTip">
+    <string>Start the final rendering processs</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+F5</string>
+   </property>
+  </action>
+  <action name="action_about">
+   <property name="icon">
+    <iconset resource="../../../data/ui_pictures.qrc">
+     <normaloff>:/buttons/logo/images/about.png</normaloff>:/buttons/logo/images/about.png</iconset>
+   </property>
+   <property name="text">
+    <string>About</string>
+   </property>
+   <property name="toolTip">
+    <string>Display information on this software</string>
+   </property>
+   <property name="shortcut">
+    <string>F1</string>
+   </property>
+  </action>
+  <action name="action_last_render">
+   <property name="icon">
+    <iconset resource="../../../data/ui_pictures.qrc">
+     <normaloff>:/buttons/logo/images/render.png</normaloff>:/buttons/logo/images/render.png</iconset>
+   </property>
+   <property name="text">
+    <string>Show last render</string>
+   </property>
+   <property name="toolTip">
+    <string>Display the last render done</string>
+   </property>
+   <property name="shortcut">
+    <string>F6</string>
+   </property>
+  </action>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>MainTerrainForm</class>
+   <extends>QWidget</extends>
+   <header>terrain/mainterrainform.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <resources>
+  <include location="../../../data/ui_pictures.qrc"/>
+ </resources>
+ <connections>
+  <connection>
+   <sender>button_explore</sender>
+   <signal>clicked()</signal>
+   <receiver>action_explore</receiver>
+   <slot>trigger()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>127</x>
+     <y>380</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>-1</x>
+     <y>-1</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>button_render</sender>
+   <signal>clicked()</signal>
+   <receiver>action_final_render</receiver>
+   <slot>trigger()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>213</x>
+     <y>425</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>213</x>
+     <y>425</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>button_file_new</sender>
+   <signal>clicked()</signal>
+   <receiver>action_file_new</receiver>
+   <slot>trigger()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>213</x>
+     <y>522</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>-1</x>
+     <y>-1</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>button_file_load</sender>
+   <signal>clicked()</signal>
+   <receiver>action_file_load</receiver>
+   <slot>trigger()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>213</x>
+     <y>588</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>-1</x>
+     <y>-1</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>button_file_save</sender>
+   <signal>clicked()</signal>
+   <receiver>action_file_save</receiver>
+   <slot>trigger()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>213</x>
+     <y>555</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>-1</x>
+     <y>-1</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>
--- a/src/editing/dialogrender.cpp
+++ b/src/editing/dialogrender.cpp
@ -133,7 +133,7 @@ DialogRender::DialogRender(QWidget *parent, Renderer* renderer):
    _actions->layout()->addWidget(_save_button);

    // Connections
-    connect(this, SIGNAL(renderSizeChanged(int, int)), this, SLOT(applyRenderSize(int, int)));
+    //connect(this, SIGNAL(renderSizeChanged(int, int)), this, SLOT(applyRenderSize(int, int)));
    connect(this, SIGNAL(progressChanged(double)), this, SLOT(applyProgress(double)));
    connect(this, SIGNAL(renderEnded()), this, SLOT(applyRenderEnded()));
    connect(_save_button, SIGNAL(clicked()), this, SLOT(saveRender()));
@ -173,7 +173,7 @@ void DialogRender::startRender(RenderParams params)
 {
    _started = time(NULL);

-    //applyRenderSize(params.width, params.height);
+    applyRenderSize(params.width, params.height);
    rendererSetPreviewCallbacks(_renderer, _renderStart, _renderDraw, _renderUpdate);

    _render_thread = new RenderThread(this, _renderer, params);
@ -217,9 +217,10 @@ void DialogRender::toneMappingChanged()

 void DialogRender::loadLastRender()
 {
-    //applyRenderSize(_renderer->render_width, _renderer->render_height);
+    applyRenderSize(_renderer->render_width, _renderer->render_height);
    rendererSetPreviewCallbacks(_renderer, _renderStart, _renderDraw, _renderUpdate);
    renderEnded();
+    toneMappingChanged();

    exec();
 }
--- a/src/editing/formclouds.cpp
+++ b/src/editing/formclouds.cpp
@ -1,5 +1,6 @@
 #include "formclouds.h"

+#include "rendering/clouds/clo_preview.h"
 #include "rendering/tools/color.h"
 #include "rendering/tools/euclid.h"
 #include "rendering/scenery.h"
@ -12,24 +13,22 @@ class PreviewCloudsCoverage:public BasePreview
 public:
    PreviewCloudsCoverage(QWidget* parent, CloudsLayerDefinition* layer):BasePreview(parent)
    {
-        _renderer = cloudsCreatePreviewCoverageRenderer();
+        _renderer = cloudsPreviewCoverageCreateRenderer();
        _3d = true;

        _original_layer = layer;
-        _preview_definition = (CloudsDefinition*)CloudsDefinitionClass.create();

        addToggle("3d", tr("Perspective"), true);
        configScaling(100.0, 1000.0, 20.0, 200.0);
    }
    ~PreviewCloudsCoverage()
    {
-        CloudsDefinitionClass.destroy(_preview_definition);
        rendererDelete(_renderer);
    }
 protected:
    Color getColor(double x, double y)
    {
-        return cloudsGetPreviewCoverage(_renderer, x, y, scaling, _3d);
+        return cloudsPreviewCoverageGetPixel(_renderer, x, y, scaling, _3d);
    }
    virtual void toggleChangeEvent(QString key, bool value)
    {
@ -41,15 +40,12 @@ protected:
    }
    void updateData()
    {
-        layersDeleteLayer(_preview_definition->layers, 0);
-        layersAddLayer(_preview_definition->layers, _original_layer);
-        CloudsRendererClass.bind(_renderer, _preview_definition);
+        cloudsPreviewCoverageBindLayer(_renderer, _original_layer);
    }

 private:
    Renderer* _renderer;
    CloudsLayerDefinition* _original_layer;
-    CloudsDefinition* _preview_definition;
    bool _3d;
 };

@ -59,27 +55,28 @@ public:
    PreviewCloudsColor(QWidget* parent, CloudsLayerDefinition* layer):BasePreview(parent)
    {
        _original_layer = layer;
-        _preview_definition = (CloudsDefinition*)CloudsDefinitionClass.create();

-        _renderer = cloudsCreatePreviewColorRenderer();
+        _renderer = cloudsPreviewMaterialCreateRenderer();

        configScaling(0.5, 2.0, 0.1, 2.0);
    }
+
+    ~PreviewCloudsColor()
+    {
+        rendererDelete(_renderer);
+    }
 protected:
    Color getColor(double x, double y)
    {
-        return cloudsGetPreviewColor(_renderer, x, y);
+        return cloudsPreviewMaterialGetPixel(_renderer, x, y);
    }
    void updateData()
    {
-        layersDeleteLayer(_preview_definition->layers, 0);
-        layersAddLayer(_preview_definition->layers, _original_layer);
-        CloudsRendererClass.bind(_renderer, _preview_definition);
+        cloudsPreviewMaterialBindLayer(_renderer, _original_layer);
    }
 private:
    Renderer* _renderer;
    CloudsLayerDefinition* _original_layer;
-    CloudsDefinition* _preview_definition;
 };

 /**************** Form ****************/
--- a/src/editing/formrender.h
+++ b/src/editing/formrender.h
@ -21,14 +21,12 @@ public slots:
    virtual void revertConfig();
    virtual void applyConfig();
    void startQuickRender();
+    void startRender();
+    void showRender();

 protected slots:
    virtual void configChangeEvent();

-private slots:
-    void startRender();
-    void showRender();
-
 private:
    RenderParams _params;
    CameraDefinition* _camera;
--- a/src/editing/paysages-qt.pro
+++ b/src/editing/paysages-qt.pro
@ -24,14 +24,13 @@ win32:LIBS += ../libpaysages.a ../libpaysages_exploring.a -lDevIL -lILU -lILUT -
 TRANSLATIONS = $$PROJECT_PATH/data/i18n/paysages_fr.ts

 HEADERS += \
-    widgetheightmap.h \
+    terrain/widgetheightmap.h \
    widgetexplorer.h \
    widgetcurveeditor.h \
    tools.h \
    previewosd.h \
    previewmaterial.h \
    previewcolorgradation.h \
-    mainwindow.h \
    inputnoise.h \
    inputmaterial.h \
    inputlayers.h \
@ -70,17 +69,19 @@ HEADERS += \
    common/freeformhelper.h \
    terrain/previewterrainshape.h \
    common/widgetsliderdecimal.h \
-    common/previewrenderer.h
+    common/previewrenderer.h \
+    terrain/widgetterrainbasenoisepreview.h \
+    common/mainwindow.h \
+    terrain/dialogbaseterrainnoise.h

 SOURCES += \
-    widgetheightmap.cpp \
+    terrain/widgetheightmap.cpp \
    widgetexplorer.cpp \
    widgetcurveeditor.cpp \
    tools.cpp \
    previewosd.cpp \
    previewmaterial.cpp \
    previewcolorgradation.cpp \
-    mainwindow.cpp \
    inputnoise.cpp \
    inputmaterial.cpp \
    inputlayers.cpp \
@ -119,12 +120,17 @@ SOURCES += \
    common/freeformhelper.cpp \
    terrain/previewterrainshape.cpp \
    common/widgetsliderdecimal.cpp \
-    common/previewrenderer.cpp
+    common/previewrenderer.cpp \
+    terrain/widgetterrainbasenoisepreview.cpp \
+    common/mainwindow.cpp \
+    terrain/dialogbaseterrainnoise.cpp

 FORMS += \
    terrain/dialogterrainpainting.ui \
    common/widgetglobalformbuttons.ui \
-    terrain/mainterrainform.ui
+    terrain/mainterrainform.ui \
+    common/mainwindow.ui \
+    terrain/dialogbaseterrainnoise.ui

 RESOURCES += \
    ../../data/ui_pictures.qrc
--- a/src/editing/terrain/dialogbaseterrainnoise.cpp
+++ b/src/editing/terrain/dialogbaseterrainnoise.cpp
@ -0,0 +1,31 @@
+#include "dialogbaseterrainnoise.h"
+#include "ui_dialogbaseterrainnoise.h"
+
+DialogBaseTerrainNoise::DialogBaseTerrainNoise(QWidget *parent) :
+    QDialog(parent),
+    ui(new Ui::DialogBaseTerrainNoise)
+{
+    ui->setupUi(this);
+
+    _original = 0;
+    _modified = noiseCreateGenerator();
+}
+
+DialogBaseTerrainNoise::~DialogBaseTerrainNoise()
+{
+    delete ui;
+    noiseDeleteGenerator(_modified);
+}
+
+void DialogBaseTerrainNoise::setNoise(NoiseGenerator* noise)
+{
+    _original = noise;
+    noiseCopy(noise, _modified);
+}
+
+int DialogBaseTerrainNoise::editNoise(QWidget* parent, NoiseGenerator* noise)
+{
+    DialogBaseTerrainNoise dialog(parent);
+    dialog.setNoise(noise);
+    return dialog.exec();
+}
--- a/src/editing/terrain/dialogbaseterrainnoise.h
+++ b/src/editing/terrain/dialogbaseterrainnoise.h
@ -0,0 +1,29 @@
+#ifndef DIALOGBASETERRAINNOISE_H
+#define DIALOGBASETERRAINNOISE_H
+
+#include <QDialog>
+#include "rendering/noise.h"
+
+namespace Ui {
+class DialogBaseTerrainNoise;
+}
+
+class DialogBaseTerrainNoise : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit DialogBaseTerrainNoise(QWidget *parent = 0);
+    ~DialogBaseTerrainNoise();
+
+    void setNoise(NoiseGenerator* noise);
+
+    static int editNoise(QWidget* parent, NoiseGenerator* noise);
+
+private:
+    Ui::DialogBaseTerrainNoise *ui;
+    NoiseGenerator* _original;
+    NoiseGenerator* _modified;
+};
+
+#endif // DIALOGBASETERRAINNOISE_H
--- a/src/editing/terrain/dialogbaseterrainnoise.ui
+++ b/src/editing/terrain/dialogbaseterrainnoise.ui
@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>DialogBaseTerrainNoise</class>
+ <widget class="QDialog" name="DialogBaseTerrainNoise">
+  <property name="windowModality">
+   <enum>Qt::ApplicationModal</enum>
+  </property>
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Paysages 3D - Base terrain noise</string>
+  </property>
+  <property name="modal">
+   <bool>true</bool>
+  </property>
+  <layout class="QHBoxLayout" name="horizontalLayout">
+   <item>
+    <widget class="WidgetGlobalFormButtons" name="widget" native="true"/>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>WidgetGlobalFormButtons</class>
+   <extends>QWidget</extends>
+   <header>common/widgetglobalformbuttons.h</header>
+   <container>1</container>
+   <slots>
+    <signal>okClicked()</signal>
+    <signal>revertClicked()</signal>
+    <signal>cancelClicked()</signal>
+   </slots>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections/>
+</ui>
--- a/src/editing/terrain/dialogterrainpainting.ui
+++ b/src/editing/terrain/dialogterrainpainting.ui
@ -789,7 +789,7 @@
  <customwidget>
   <class>WidgetHeightMap</class>
   <extends>QWidget</extends>
-   <header>widgetheightmap.h</header>
+   <header>terrain/widgetheightmap.h</header>
   <container>1</container>
   <slots>
    <signal>heightmapChanged()</signal>
--- a/src/editing/terrain/mainterrainform.cpp
+++ b/src/editing/terrain/mainterrainform.cpp
@ -1,6 +1,8 @@
 #include "mainterrainform.h"
 #include "ui_mainterrainform.h"

+#include <QMessageBox>
+#include "dialogbaseterrainnoise.h"
 #include "dialogterrainpainting.h"
 #include "previewterrainshape.h"
 #include "tools.h"
@ -20,15 +22,16 @@ MainTerrainForm::MainTerrainForm(QWidget *parent) :
    _form_helper->addPreview(ui->preview_shape, _renderer_shape);

    _form_helper->addDoubleInputSlider(ui->input_scaling, &_terrain->scaling, 0.1, 3.0, 0.03, 0.3);
-    _form_helper->addDoubleInputSlider(ui->input_height, &_terrain->height, 1.0, 45.0, 0.3, 3.0);
+    _form_helper->addDoubleInputSlider(ui->input_height, &_terrain->height, 1.0, 90.0, 0.5, 5.0);
    _form_helper->addDoubleInputSlider(ui->input_shadow_smoothing, &_terrain->shadow_smoothing, 0.0, 0.3, 0.003, 0.03);
-    _form_helper->addDoubleInputSlider(ui->input_water_height, &_terrain->water_height, -2.0, 2.0, 0.01, 0.1);
+    _form_helper->addDoubleInputSlider(ui->input_water_height, &_terrain->water_height, -1.0, 1.0, 0.01, 0.1);

    _form_helper->setApplyButton(ui->button_apply);
    _form_helper->setRevertButton(ui->button_revert);
    _form_helper->setExploreButton(ui->button_explore);
    _form_helper->setRenderButton(ui->button_render);

+    connect(ui->button_dialog_basenoise, SIGNAL(clicked()), this, SLOT(buttonBaseNoisePressed()));
    connect(ui->button_dialog_painting, SIGNAL(clicked()), this, SLOT(buttonPaintingPressed()));
    connect(ui->button_goto_textures, SIGNAL(clicked()), this, SLOT(buttonTexturesPressed()));

@ -55,6 +58,8 @@ void MainTerrainForm::refreshFromLocalData()
    {
        _form_helper->setLabelText("label_painting_info", tr("No manual scuplting done"));
    }
+
+    ui->widget_base_noise_preview->setNoise(_terrain->_height_noise);
 }

 void MainTerrainForm::refreshFromFellowData()
@ -77,6 +82,27 @@ void MainTerrainForm::alterRenderer(Renderer* renderer)
    TerrainRendererClass.bind(renderer, _terrain);
 }

+void MainTerrainForm::buttonBaseNoisePressed()
+{
+    int erase;
+    if (terrainGetMemoryStats(_terrain) > 0)
+    {
+        erase = QMessageBox::question(this, tr("Paysages 3D - Base noise edition"), tr("You have manual modifications on this terrain, regenerating base noise may produce weird results."), tr("Keep my changes anyway"), tr("Erase my changes"));
+    }
+    else
+    {
+        erase = 0;
+    }
+
+    if (DialogBaseTerrainNoise::editNoise(this, _terrain->_height_noise))
+    {
+        if (erase)
+        {
+            terrainClearPainting(_terrain->height_map);
+        }
+    }
+}
+
 void MainTerrainForm::buttonPaintingPressed()
 {
    DialogTerrainPainting dialog(this, _terrain);
--- a/src/editing/terrain/mainterrainform.h
+++ b/src/editing/terrain/mainterrainform.h
@ -26,6 +26,7 @@ public slots:
    void commitLocalDataToScenery();
    void alterRenderer(Renderer* renderer);

+    void buttonBaseNoisePressed();
    void buttonPaintingPressed();
    void buttonTexturesPressed();

--- a/src/editing/terrain/mainterrainform.ui
+++ b/src/editing/terrain/mainterrainform.ui
@ -44,7 +44,7 @@
        <item>
         <layout class="QHBoxLayout" name="horizontalLayout_4">
          <item>
-           <widget class="QPushButton" name="pushButton">
+           <widget class="QPushButton" name="button_dialog_basenoise">
            <property name="text">
             <string>Generate base noise</string>
            </property>
@ -54,7 +54,7 @@
           </widget>
          </item>
          <item>
-           <widget class="QWidget" name="widget" native="true">
+           <widget class="WidgetTerrainBaseNoisePreview" name="widget_base_noise_preview" native="true">
            <property name="sizePolicy">
             <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
              <horstretch>1</horstretch>
@ -447,6 +447,12 @@
   <extends>QSlider</extends>
   <header>common/widgetsliderdecimal.h</header>
  </customwidget>
+  <customwidget>
+   <class>WidgetTerrainBaseNoisePreview</class>
+   <extends>QWidget</extends>
+   <header>terrain/widgetterrainbasenoisepreview.h</header>
+   <container>1</container>
+  </customwidget>
 </customwidgets>
 <resources>
  <include location="../../../data/ui_pictures.qrc"/>
--- a/src/editing/terrain/previewterrainshape.cpp
+++ b/src/editing/terrain/previewterrainshape.cpp
@ -5,6 +5,7 @@
 PreviewTerrainShape::PreviewTerrainShape(TerrainDefinition* terrain)
 {
    _terrain = terrain;
+    _highlight_enabled = true;

    // TODO Don't delete the base renderer, just alter it
    rendererDelete(renderer);
@ -14,6 +15,7 @@ PreviewTerrainShape::PreviewTerrainShape(TerrainDefinition* terrain)
 void PreviewTerrainShape::bindEvent(BasePreview* preview)
 {
    preview->addOsd(QString("geolocation"));
+    //preview->addToggle("highlight", tr("Coverage highlight"), true);

    preview->configScaling(20.0, 1000.0, 20.0, 50.0);
    preview->configScrolling(-1000.0, 1000.0, 0.0, -1000.0, 1000.0, 0.0);
@ -26,5 +28,13 @@ void PreviewTerrainShape::updateEvent()

 Color PreviewTerrainShape::getColor2D(double x, double y, double scaling)
 {
-    return terrainGetPreviewColor(renderer, x, y, scaling);
+    return waterGetPreviewCoverage(renderer, x, y, scaling, _highlight_enabled ? 1 : 0);
+}
+
+void PreviewTerrainShape::toggleChangeEvent(QString key, bool value)
+{
+    if (key == "highlight")
+    {
+        _highlight_enabled = value;
+    }
 }
--- a/src/editing/terrain/previewterrainshape.h
+++ b/src/editing/terrain/previewterrainshape.h
@ -15,9 +15,12 @@ protected:
    virtual void bindEvent(BasePreview* preview);
    virtual void updateEvent();
    virtual Color getColor2D(double x, double y, double scaling);
+    virtual void toggleChangeEvent(QString key, bool value);

 private:
    TerrainDefinition* _terrain;
+    bool _highlight_enabled;
+    double _water_height;
 };

 #endif // PREVIEWTERRAINSHAPE_H
--- a/src/editing/terrain/widgetheightmap.cpp
+++ b/src/editing/terrain/widgetheightmap.cpp
@ -35,8 +35,8 @@ QGLWidget(parent)
    _average_frame_time = 0.0;

    _last_brush_action = 0;
-    _last_mouse_x = 0;
-    _last_mouse_y = 0;
+    _last_mouse_x = 250;
+    _last_mouse_y = 250;
    _last_time = QDateTime::currentDateTime();
    _mouse_moved = false;

--- a/src/editing/terrain/widgetheightmap.h
+++ b/src/editing/terrain/widgetheightmap.h
--- a/src/editing/terrain/widgetterrainbasenoisepreview.cpp
+++ b/src/editing/terrain/widgetterrainbasenoisepreview.cpp
@ -0,0 +1,45 @@
+#include "widgetterrainbasenoisepreview.h"
+
+#include <QPainter>
+#include <QPaintEvent>
+#include "tools.h"
+
+WidgetTerrainBaseNoisePreview::WidgetTerrainBaseNoisePreview(QWidget* parent) :
+    QWidget(parent)
+{
+    _noise = NULL;
+}
+
+void WidgetTerrainBaseNoisePreview::setNoise(NoiseGenerator* noise)
+{
+    _noise = noise;
+    update();
+}
+
+void WidgetTerrainBaseNoisePreview::paintEvent(QPaintEvent* event)
+{
+    QPainter painter(this);
+
+    painter.setBrush(Qt::SolidPattern);
+    painter.drawRect(rect());
+
+    int height = this->height();
+
+    if (_noise)
+    {
+        QRect boundaries = event->region().boundingRect();
+        double value, factor;
+        double minvalue, maxvalue;
+
+        noiseGetRange(_noise, &minvalue, &maxvalue);
+        factor = ((double)height) / (maxvalue - minvalue);
+
+        for (int x = boundaries.left(); x <= boundaries.right(); x++)
+        {
+            value = noiseGet1DTotal(_noise, 100.0 * ((double)x) / factor);
+
+            painter.setPen(Qt::white);
+            painter.drawLine(x, height - 1 - (value - minvalue) * factor, x, height - 1);
+        }
+    }
+}
--- a/src/editing/terrain/widgetterrainbasenoisepreview.h
+++ b/src/editing/terrain/widgetterrainbasenoisepreview.h
@ -0,0 +1,26 @@
+#ifndef _PAYSAGES_EDITING_TERRAIN_WIDGETTERRAINBASENOISEPREVIEW_H_
+#define _PAYSAGES_EDITING_TERRAIN_WIDGETTERRAINBASENOISEPREVIEW_H_
+
+#include <QWidget>
+#include "rendering/noise.h"
+
+class WidgetTerrainBaseNoisePreview : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit WidgetTerrainBaseNoisePreview(QWidget* parent = 0);
+
+    void setNoise(NoiseGenerator* noise);
+
+protected:
+    virtual void paintEvent(QPaintEvent* event);
+
+signals:
+    
+public slots:
+
+private:
+    NoiseGenerator* _noise;
+};
+
+#endif
--- a/src/rendering/atmosphere/atm_bruneton.c
+++ b/src/rendering/atmosphere/atm_bruneton.c
@ -922,6 +922,8 @@ static Color _getInscatterColor(Vector3* _x, double* _t, Vector3 v, Vector3 s, d
 static Color _sunColor(Vector3 v, Vector3 s, double r, double mu, double radius)
 {
    Color transmittance = r <= Rt ? _transmittanceWithShadow(r, mu) : COLOR_WHITE; /* T(x,xo) */
+    double d = _limit(r, mu);
+    radius *= (1.0 + 10.0 * d / Rt); /* Inflating due to lens effect near horizon */
    double isun = step(cos(radius * M_PI / 180.0), v3Dot(v, s)) * ISun; /* Lsun */
    transmittance.r *= isun;
    transmittance.g *= isun;
--- a/src/rendering/clouds/clo_definition.c
+++ b/src/rendering/clouds/clo_definition.c
@ -112,7 +112,7 @@ void cloudsLayerValidateDefinition(CloudsLayerDefinition* definition)
            break;
    }

-    noiseNormalizeAmplitude(definition->_coverage_noise, 0.0, 1.0, 0);
+    noiseNormalizeAmplitude(definition->_coverage_noise, -1.0, 3.0, 0);
    noiseNormalizeAmplitude(definition->_shape_noise, -0.5, 0.5, 0);
 }

--- a/src/rendering/clouds/clo_preview.c
+++ b/src/rendering/clouds/clo_preview.c
@ -18,7 +18,7 @@ Color _fakeApplyLightingToSurface(Renderer* renderer, Vector3 location, Vector3
    return COLOR_WHITE;
 }

-Renderer* cloudsCreatePreviewCoverageRenderer()
+Renderer* cloudsPreviewCoverageCreateRenderer()
 {
    Renderer* result = rendererCreate();
    result->render_quality = 5;
@ -26,7 +26,15 @@ Renderer* cloudsCreatePreviewCoverageRenderer()
    return result;
 }

-Color cloudsGetPreviewCoverage(Renderer* renderer, double x, double y, double scaling, int perspective)
+void cloudsPreviewCoverageBindLayer(Renderer* renderer, CloudsLayerDefinition* layer)
+{
+    CloudsDefinition* definition = (CloudsDefinition*)CloudsDefinitionClass.create();
+    layersAddLayer(definition->layers, layer);
+    CloudsRendererClass.bind(renderer, definition);
+    CloudsDefinitionClass.destroy(definition);
+}
+
+Color cloudsPreviewCoverageGetPixel(Renderer* renderer, double x, double y, double scaling, int perspective)
 {
    if (perspective)
    {
@ -55,25 +63,91 @@ Color cloudsGetPreviewCoverage(Renderer* renderer, double x, double y, double sc
    }
 }

-Renderer* cloudsCreatePreviewColorRenderer()
+static void _getLightingStatus(Renderer* renderer, LightStatus* status, Vector3 normal, int opaque)
+{
+    LightDefinition light;
+
+    UNUSED(renderer);
+    UNUSED(normal);
+    UNUSED(opaque);
+
+    light.color.r = 1.0;
+    light.color.g = 1.0;
+    light.color.b = 1.0;
+    light.direction.x = -1.0;
+    light.direction.y = -0.5;
+    light.direction.z = 1.0;
+    light.direction = v3Normalize(light.direction);
+    light.altered = 1;
+    light.reflection = 0.0;
+    lightingPushLight(status, &light);
+
+    light.color.r = 0.2;
+    light.color.g = 0.2;
+    light.color.b = 0.2;
+    light.direction.x = 1.0;
+    light.direction.y = -0.5;
+    light.direction.z = -1.0;
+    light.direction = v3Normalize(light.direction);
+    light.altered = 0;
+    light.reflection = 0.0;
+    lightingPushLight(status, &light);
+}
+
+Renderer* cloudsPreviewMaterialCreateRenderer()
 {
    Renderer* result = rendererCreate();
    result->render_quality = 8;
+    result->atmosphere->getLightingStatus = _getLightingStatus;
    return result;
 }

-Color cloudsGetPreviewColor(Renderer* renderer, double x, double y)
+static double _getDensity(Renderer* renderer, CloudsLayerDefinition* layer, Vector3 location)
+{
+    UNUSED(renderer);
+    UNUSED(layer);
+
+    double distance = v3Norm(location);
+    if (distance > 1.0)
+    {
+        return 0.0;
+    }
+    else if (distance < 0.8)
+    {
+        return 1.0;
+    }
+    else
+    {
+        return (1.0 - distance) / 0.2;
+    }
+}
+
+void cloudsPreviewMaterialBindLayer(Renderer* renderer, CloudsLayerDefinition* layer)
+{
+    CloudsDefinition* definition = (CloudsDefinition*)CloudsDefinitionClass.create();
+    layersAddLayer(definition->layers, layer);
+    CloudsRendererClass.bind(renderer, definition);
+    CloudsDefinitionClass.destroy(definition);
+
+    layer = layersGetLayer(renderer->clouds->definition->layers, 0);
+    layer->lower_altitude = -1.0;
+    layer->thickness = 2.0;
+
+    renderer->clouds->getLayerDensity = _getDensity;
+}
+
+Color cloudsPreviewMaterialGetPixel(Renderer* renderer, double x, double y)
 {
    Vector3 start, end;
-    double thickness = 0.5;
+    double thickness = 2.0;

    start.x = x * thickness * 0.5;
-    start.y = -y * thickness * 0.5;
-    start.z = thickness * 0.5;
+    start.z = y * thickness * 0.5;
+    start.y = thickness * 0.5;

    end.x = start.x;
-    end.y = start.y;
-    end.z = -start.z;
+    end.z = start.z;
+    end.y = -start.y;

    return renderer->clouds->getColor(renderer, COLOR_BLUE, start, end);
 }
--- a/src/rendering/clouds/clo_preview.h
+++ b/src/rendering/clouds/clo_preview.h
@ -0,0 +1,28 @@
+#ifndef _PAYSAGES_CLOUDS_PREVIEW_H_
+#define _PAYSAGES_CLOUDS_PREVIEW_H_
+
+#include "public.h"
+#include "../tools/euclid.h"
+
+/**
+ * Cloud preview helpers.
+ */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+Renderer* cloudsPreviewCoverageCreateRenderer();
+void cloudsPreviewCoverageBindLayer(Renderer* renderer, CloudsLayerDefinition* layer);
+Color cloudsPreviewCoverageGetPixel(Renderer* renderer, double x, double y, double scaling, int perspective);
+
+Renderer* cloudsPreviewMaterialCreateRenderer();
+void cloudsPreviewMaterialBindLayer(Renderer* renderer, CloudsLayerDefinition* layer);
+Color cloudsPreviewMaterialGetPixel(Renderer* renderer, double x, double y);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
--- a/src/rendering/clouds/clo_rendering.c
+++ b/src/rendering/clouds/clo_rendering.c
@ -1,9 +1,11 @@
 #include "private.h"

+#include <assert.h>
 #include <stdlib.h>
 #include "../tools.h"
 #include "../renderer.h"
 #include "clo_density.h"
+#include "clo_walking.h"

 /******************** Fake ********************/
 static int _fakeAlterLight(Renderer* renderer, LightDefinition* light, Vector3 location)
@ -25,24 +27,117 @@ static Color _fakeGetColor(Renderer* renderer, Color base, Vector3 start, Vector
 }

 /******************** Real ********************/
-/*static int _cmpLayer(const void* layer1, const void* layer2)
+typedef struct
 {
-    return (((CloudsLayerDefinition*)layer1)->lower_altitude > ((CloudsLayerDefinition*)layer2)->lower_altitude) ? -1 : 1;
-}*/
+    double light_power;
+    double out_scattering; /* Amount of light scattered away by heavy particles */
+} AccumulatedLightData;
+
+static void _walkerFilterCallback(CloudsWalker* walker)
+{
+    CloudWalkerStepInfo* segment = cloudsWalkerGetLastSegment(walker);
+    AccumulatedLightData* data = (AccumulatedLightData*)segment->data;
+
+    assert(data != NULL);
+
+    double density_integral = segment->length * (segment->start.global_density + segment->end.global_density) / 2.0;
+
+    data->out_scattering += 0.3 * density_integral;
+
+    if (data->out_scattering > data->light_power)
+    {
+        cloudsWalkerOrderStop(walker);
+    }
+}

 static int _alterLight(Renderer* renderer, LightDefinition* light, Vector3 location)
 {
    CloudsDefinition* definition = renderer->clouds->definition;
    int i, n;

+    AccumulatedLightData data;
+    data.out_scattering = 0.0;
+    data.light_power = colorGetPower(&light->color);
+
    /* TODO Iter layers in sorted order */
    n = layersCount(definition->layers);
    for (i = 0; i < n; i++)
    {
-        light->color = cloudsLayerFilterLight(layersGetLayer(definition->layers, i), renderer, light->color, location, v3Add(location, v3Scale(light->direction, -10000.0)), v3Scale(light->direction, -1.0));
-        /* TODO Reduce light->reflection too */
+        CloudsLayerDefinition* layer = (CloudsLayerDefinition*)layersGetLayer(renderer->clouds->definition->layers, i);
+        Vector3 ostart, oend;
+
+        ostart = location;
+        oend = v3Add(location, v3Scale(light->direction, -10000.0));
+        if (!cloudsOptimizeWalkingBounds(layer, &ostart, &oend))
+        {
+            continue;
        }
-    return n > 0;
+        else
+        {
+            CloudsWalker* walker;
+
+            walker = cloudsCreateWalker(renderer, layer, ostart, oend);
+            cloudsWalkerSetStepSize(walker, -1.0);
+            cloudsStartWalking(walker, _walkerFilterCallback, &data);
+            cloudsDeleteWalker(walker);
+        }
+    }
+
+    double max_power = colorGetPower(&light->color) - data.out_scattering;
+    if (max_power < 0.0)
+    {
+        light->color = COLOR_BLACK;
+    }
+    else
+    {
+        colorLimitPower(&light->color, max_power);
+    }
+
+    return data.out_scattering > 0.0;
+}
+
+typedef struct
+{
+    double out_scattering; /* Amount of light scattered away by heavy particles */
+    Color in_scattering; /* Amount of light redirected toward the viewer */
+} AccumulatedMaterialData;
+
+static inline void _applyOutScattering(Color* col, double out_scattering)
+{
+    if (out_scattering >= 1.0)
+    {
+        col->r = col->g = col->b = 0.0;
+    }
+    else
+    {
+        col->r *= (1.0 - out_scattering);
+        col->g *= (1.0 - out_scattering);
+        col->b *= (1.0 - out_scattering);
+    }
+}
+
+static void _walkerMaterialCallback(CloudsWalker* walker)
+{
+    CloudWalkerStepInfo* segment = cloudsWalkerGetLastSegment(walker);
+    AccumulatedMaterialData* data = (AccumulatedMaterialData*)segment->data;
+    Renderer* renderer = segment->renderer;
+    CloudsLayerDefinition* layer = segment->layer;
+
+    assert(data != NULL);
+
+    double density_integral = segment->length * (segment->start.global_density + segment->end.global_density) / 2.0;
+
+    data->out_scattering += 0.5 * density_integral;
+
+    Color in_scattering = renderer->applyLightingToSurface(renderer, segment->start.location, VECTOR_UP, &layer->material);
+    in_scattering.r *= density_integral * 5.0;
+    in_scattering.g *= density_integral * 5.0;
+    in_scattering.b *= density_integral * 5.0;
+    _applyOutScattering(&in_scattering, data->out_scattering);
+
+    data->in_scattering.r += in_scattering.r;
+    data->in_scattering.g += in_scattering.g;
+    data->in_scattering.b += in_scattering.b;
 }

 static Color _getColor(Renderer* renderer, Color base, Vector3 start, Vector3 end)
@ -59,7 +154,39 @@ static Color _getColor(Renderer* renderer, Color base, Vector3 start, Vector3 en
    /* TODO Iter layers in sorted order */
    for (i = 0; i < n; i++)
    {
-        base = cloudsApplyLayer(layersGetLayer(definition->layers, i), base, renderer, start, end);
+        CloudsLayerDefinition* layer = (CloudsLayerDefinition*)layersGetLayer(renderer->clouds->definition->layers, i);
+        Vector3 ostart, oend;
+
+        ostart = start;
+        oend = end;
+        if (!cloudsOptimizeWalkingBounds(layer, &ostart, &oend))
+        {
+            continue;
+        }
+        else
+        {
+            CloudsWalker* walker;
+            AccumulatedMaterialData data;
+            data.out_scattering = 0.0;
+            data.in_scattering = COLOR_BLACK;
+
+            walker = cloudsCreateWalker(renderer, layer, ostart, oend);
+            cloudsWalkerSetStepSize(walker, -1.0);
+            cloudsStartWalking(walker, _walkerMaterialCallback, &data);
+            cloudsDeleteWalker(walker);
+
+            /* Apply final out_scattering to base */
+            _applyOutScattering(&base, data.out_scattering);
+
+            /* Apply in_scattering */
+            base.r += data.in_scattering.r;
+            base.g += data.in_scattering.g;
+            base.b += data.in_scattering.b;
+
+            /* Apply aerial perspective approximation */
+            /* TODO This should be done at cloud entry */
+            base = renderer->atmosphere->applyAerialPerspective(renderer, ostart, base).final;
+        }
    }

    return base;
--- a/src/rendering/clouds/clo_tools.c
+++ b/src/rendering/clouds/clo_tools.c
@ -1,149 +0,0 @@
-#include "private.h"
-
-/*
- * Clouds tools.
- */
-
-#include "clo_walking.h"
-#include "../renderer.h"
-#include "../tools.h"
-
-static inline Vector3 _getNormal(CloudsLayerDefinition* layer, Vector3 position, double detail)
-{
-    Vector3 result = {0.0, 0.0, 0.0};
-    /*Vector3 dposition;
-    double val, dval;
-
-    val = _getDistanceToBorder(layer, position);
-
-    dposition.x = position.x + detail;
-    dposition.y = position.y;
-    dposition.z = position.z;
-    dval = val - _getDistanceToBorder(layer, dposition);
-    result.x += dval;
-
-    dposition.x = position.x - detail;
-    dval = val - _getDistanceToBorder(layer, dposition);
-    result.x -= dval;
-
-    dposition.x = position.x;
-    dposition.y = position.y + detail;
-    dval = val - _getDistanceToBorder(layer, dposition);
-    result.y += dval;
-
-    dposition.y = position.y - detail;
-    dval = val - _getDistanceToBorder(layer, dposition);
-    result.y -= dval;
-
-    dposition.y = position.y;
-    dposition.z = position.z + detail;
-    dval = val - _getDistanceToBorder(layer, dposition);
-    result.z += dval;
-
-    dposition.z = position.z - detail;
-    dval = val - _getDistanceToBorder(layer, dposition);
-    result.z -= dval;*/
-
-    return v3Normalize(result);
-}
-
-static Color _applyLayerLighting(CloudsLayerDefinition* definition, Renderer* renderer, Vector3 location, double detail)
-{
-    Vector3 normal;
-    Color col1, col2;
-    LightStatus* lighting;
-
-    normal = _getNormal(definition, location, 3.0);
-    if (renderer->render_quality > 3)
-    {
-        normal = v3Add(normal, _getNormal(definition, location, 2.0));
-        normal = v3Add(normal, _getNormal(definition, location, 1.0));
-    }
-    if (renderer->render_quality > 5)
-    {
-        normal = v3Add(normal, _getNormal(definition, location, 0.5));
-    }
-    if (renderer->render_quality > 8)
-    {
-        normal = v3Add(normal, _getNormal(definition, location, 0.75));
-        normal = v3Add(normal, _getNormal(definition, location, 1.25));
-        normal = v3Add(normal, _getNormal(definition, location, 2.5));
-    }
-    normal = v3Scale(v3Normalize(normal), definition->hardness);
-
-    return renderer->applyLightingToSurface(renderer, location, normal, &definition->material);
-
-    lighting = lightingCreateStatus(renderer->lighting, location, renderer->getCameraLocation(renderer, location));
-    renderer->atmosphere->getLightingStatus(renderer, lighting, normal, 0);
-    col1 = lightingApplyStatus(lighting, normal, &definition->material);
-    col2 = lightingApplyStatus(lighting, v3Scale(normal, -1.0), &definition->material);
-    lightingDeleteStatus(lighting);
-
-    col1.r = (col1.r + col2.r) / 2.0;
-    col1.g = (col1.g + col2.g) / 2.0;
-    col1.b = (col1.b + col2.b) / 2.0;
-    col1.a = (col1.a + col2.a) / 2.0;
-
-    return col1;
-}
-
-Color cloudsApplyLayer(CloudsLayerDefinition* definition, Color base, Renderer* renderer, Vector3 start, Vector3 end)
-{
-    int segment_count;
-    Color col;
-    CloudPrimarySegment segments[MAX_SEGMENT_COUNT];
-
-    segment_count = cloudsGetLayerPrimarySegments(renderer, definition, start, end, MAX_SEGMENT_COUNT, segments);
-    /* TODO Crawl in segments for render */
-
-    col = definition->material.base;
-    /*if (definition->transparencydepth == 0 || inside_length >= definition->transparencydepth)
-    {
-        col.a = 1.0;
-    }
-    else
-    {
-        col.a = inside_length / definition->transparencydepth;
-    }*/
-
-    col = renderer->atmosphere->applyAerialPerspective(renderer, start, col).final;
-    col.a = 0.0;
-
-    colorMask(&base, &col);
-
-    return base;
-}
-
-Color cloudsLayerFilterLight(CloudsLayerDefinition* definition, Renderer* renderer, Color light, Vector3 location, Vector3 light_location, Vector3 direction_to_light)
-{
-    /*double inside_depth, total_depth, factor;
-    CloudSegment segments[MAX_SEGMENT_COUNT];
-
-    if (!cloudsOptimizeWalkingBounds(definition, &location, &light_location))
-    {
-        return light;
-    }
-
-    _getPrimarySegments(definition, renderer, location, direction_to_light, MAX_SEGMENT_COUNT, definition->lighttraversal, v3Norm(v3Sub(light_location, location)), &inside_depth, &total_depth, segments);
-
-    if (definition->lighttraversal < 0.0001)
-    {
-        factor = 0.0;
-    }
-    else
-    {
-        factor = inside_depth / definition->lighttraversal;
-        if (factor > 1.0)
-        {
-            factor = 1.0;
-        }
-    }
-
-    factor = 1.0 - (1.0 - definition->minimumlight) * factor;
-
-    light.r = light.r * factor;
-    light.g = light.g * factor;
-    light.b = light.b * factor;*/
-
-    return light;
-}
--- a/src/rendering/clouds/clo_walking.c
+++ b/src/rendering/clouds/clo_walking.c
@ -2,6 +2,47 @@

 #include "../renderer.h"

+/**
+ * Control of the next walking order.
+ */
+typedef enum
+{
+    CLOUD_WALKING_CONTINUE,
+    CLOUD_WALKING_STOP,
+    CLOUD_WALKING_REFINE,
+    CLOUD_WALKING_SUBDIVIDE
+} CloudWalkingOrder;
+
+/**
+ * Additional info for walking orders.
+ */
+typedef struct
+{
+    CloudWalkingOrder order;
+    double precision;
+    int max_segments;
+} CloudWalkingNextAction;
+
+/*
+ * Private structure for the walker.
+ */
+struct CloudsWalker
+{
+    Vector3 start;
+    Vector3 end;
+    Vector3 diff;
+
+    double cursor;
+    double max_length;
+    double step_size;
+
+    int started;
+    CloudWalkerStepInfo last_segment;
+
+    CloudWalkingNextAction next_action;
+};
+
+
 int cloudsOptimizeWalkingBounds(CloudsLayerDefinition* layer, Vector3* start, Vector3* end)
 {
    Vector3 diff;
@ -51,107 +92,176 @@ int cloudsOptimizeWalkingBounds(CloudsLayerDefinition* layer, Vector3* start, Ve
        }
    }

-    /* TODO Limit the search length */
    return 1;
 }

-int cloudsGetLayerPrimarySegments(Renderer* renderer, CloudsLayerDefinition* layer, Vector3 start, Vector3 end, int max_segments, CloudPrimarySegment* out_segments)
+CloudsWalker* cloudsCreateWalker(Renderer* renderer, CloudsLayerDefinition* layer, Vector3 start, Vector3 end)
 {
-    int inside, segment_count;
-    double step_length, segment_length;
-    Vector3 diff, walker, segment_start;
-    double render_precision, density;
-    double diff_length, progress;
+    CloudsWalker* result;

-    if (max_segments <= 0)
-    {
-        return 0;
-    }
+    result = (CloudsWalker*)malloc(sizeof (CloudsWalker));

-    if (!cloudsOptimizeWalkingBounds(layer, &start, &end))
-    {
-        return 0;
-    }
+    result->start = start;
+    result->end = end;
+    result->diff = v3Sub(end, start);
+    result->max_length = v3Norm(result->diff);
+    result->cursor = 0.0;
+    result->step_size = 1.0;

-    diff = v3Sub(end, start);
-    diff_length = v3Norm(diff);
+    result->started = 0;
+    result->last_segment.renderer = renderer;
+    result->last_segment.layer = layer;

-    if (diff_length < 0.000001)
-    {
-        return 0;
-    }
+    result->next_action.order = CLOUD_WALKING_CONTINUE;

-    render_precision = 1.005 - 0.01 * (double)(renderer->render_quality * renderer->render_quality);
-    /*if (render_precision > max_total_length / 10.0)
-    {
-        render_precision = max_total_length / 10.0;
-    }
-    else if (render_precision < max_total_length / 10000.0)
-    {
-        render_precision = max_total_length / 10000.0;
-    }*/
-
-    segment_count = 0;
-    segment_length = 0.0;
-    density = renderer->clouds->getLayerDensity(renderer, layer, start);
-    progress = 0.0;
-    step_length = render_precision;
-    inside = (density > 0.0);
-
-    do
-    {
-        progress += step_length;
-        walker = v3Add(start, v3Scale(diff, progress / diff_length));
-
-        if (progress >= diff_length)
-        {
-            density = 0.0;
-        }
-        else
-        {
-            density = renderer->clouds->getLayerDensity(renderer, layer, walker);
-        }
-
-        if (density > 0.0)
-        {
-            if (inside)
-            {
-                /* inside the cloud */
-                segment_length += step_length;
-            }
-            else
-            {
-                /* entering the cloud */
-                segment_length = step_length;
-                segment_start = v3Add(start, v3Scale(diff, (progress - step_length) / diff_length));
-                /* TODO Refine entry position */
-
-                inside = 1;
-            }
-        }
-        else
-        {
-            if (inside)
-            {
-                /* exiting the cloud */
-                segment_length += step_length;
-
-                out_segments->enter = segment_start;
-                out_segments->exit = walker;
-                out_segments->length = segment_length;
-                out_segments++;
-                if (++segment_count >= max_segments)
-                {
-                    break;
-                }
-                /* TODO Refine exit position */
-
-                inside = 0;
-            }
-        }
-        /* step = v3Scale(direction, (info.distance_to_edge < render_precision) ? render_precision : info.distance_to_edge); */
-    }
-    while (inside || (walker.y <= layer->lower_altitude + layer->thickness + 0.001 && walker.y >= layer->lower_altitude - 0.001 && progress < diff_length));
-
-    return segment_count;
+    return result;
+}
+
+void cloudsDeleteWalker(CloudsWalker* walker)
+{
+    free(walker);
+}
+
+void cloudsWalkerSetStepSize(CloudsWalker* walker, double step)
+{
+    if (step > 0.0)
+    {
+        walker->step_size = step;
+    }
+    else
+    {
+        /* TODO Automatic settings (using rendering quality and cloud feature size) */
+        walker->step_size = 1.0;
+    }
+}
+
+static void _getPoint(CloudsWalker* walker, double cursor, CloudWalkerPoint* out_point)
+{
+    out_point->distance_from_start = cursor;
+    out_point->location = v3Add(walker->start, v3Scale(walker->diff, out_point->distance_from_start / walker->max_length));
+
+    Renderer* renderer = walker->last_segment.renderer;
+    CloudsLayerDefinition* layer = walker->last_segment.layer;
+    out_point->global_density = renderer->clouds->getLayerDensity(renderer, layer, out_point->location);
+}
+
+static void _refineSegment(CloudsWalker* walker, double start_cursor, double start_density, double end_cursor, double end_density, double precision, CloudWalkerPoint* result)
+{
+    CloudWalkerPoint middle;
+
+    _getPoint(walker, (start_cursor + end_cursor) / 2.0, &middle);
+
+    if (start_density == 0.0)
+    {
+        /* Looking for entry */
+        if (middle.distance_from_start - start_cursor < precision)
+        {
+            *result = middle;
+        }
+        else if (middle.global_density == 0.0)
+        {
+            _refineSegment(walker, middle.distance_from_start, middle.global_density, end_cursor, end_density, precision, result);
+        }
+        else
+        {
+            _refineSegment(walker, start_cursor, start_density, middle.distance_from_start, middle.global_density, precision, result);
+        }
+    }
+    else
+    {
+        /* Looking for exit */
+        if (end_cursor - middle.distance_from_start < precision)
+        {
+            *result = middle;
+        }
+        else if (middle.global_density == 0.0)
+        {
+            _refineSegment(walker, start_cursor, start_density, middle.distance_from_start, middle.global_density, precision, result);
+        }
+        else
+        {
+            _refineSegment(walker, middle.distance_from_start, middle.global_density, end_cursor, end_density, precision, result);
+        }
+    }
+}
+
+int cloudsWalkerPerformStep(CloudsWalker* walker)
+{
+    if (!walker->started)
+    {
+        _getPoint(walker, 0.0, &walker->last_segment.end);
+        walker->started = 1;
+    }
+
+    if (walker->next_action.order == CLOUD_WALKING_STOP || walker->cursor >= walker->max_length)
+    {
+        walker->next_action.order = CLOUD_WALKING_STOP;
+        return 0;
+    }
+    else if (walker->next_action.order == CLOUD_WALKING_CONTINUE)
+    {
+        /* TODO Limit to end */
+        walker->last_segment.start = walker->last_segment.end;
+
+        walker->cursor += walker->step_size;
+
+        _getPoint(walker, walker->cursor, &walker->last_segment.end);
+        walker->last_segment.length = walker->step_size;
+        walker->last_segment.refined = 0;
+
+        return 1;
+    }
+    else if (walker->next_action.order == CLOUD_WALKING_REFINE)
+    {
+        /* Refine segment with dichotomy */
+        _refineSegment(walker,
+                       walker->last_segment.start.distance_from_start,
+                       walker->last_segment.start.global_density,
+                       walker->last_segment.end.distance_from_start,
+                       walker->last_segment.end.global_density,
+                       walker->next_action.precision,
+                       (walker->last_segment.start.global_density == 0.0) ? (&walker->last_segment.start) : (&walker->last_segment.end));
+        walker->last_segment.length = walker->last_segment.end.distance_from_start - walker->last_segment.start.distance_from_start;
+        walker->last_segment.refined = 1;
+
+        walker->next_action.order = CLOUD_WALKING_CONTINUE;
+
+        return 1;
+    }
+    else
+    {
+        /* TODO */
+        return 0;
+    }
+}
+
+void cloudsWalkerOrderStop(CloudsWalker* walker)
+{
+    walker->next_action.order = CLOUD_WALKING_STOP;
+}
+
+void cloudsWalkerOrderRefine(CloudsWalker* walker, double precision)
+{
+    walker->next_action.order = CLOUD_WALKING_REFINE;
+    walker->next_action.precision = precision;
+}
+
+void cloudsWalkerOrderSubdivide(CloudsWalker* walker, double max_segments)
+{
+    walker->next_action.order = CLOUD_WALKING_SUBDIVIDE;
+    walker->next_action.max_segments = max_segments;
+}
+
+CloudWalkerStepInfo* cloudsWalkerGetLastSegment(CloudsWalker* walker)
+{
+    return &walker->last_segment;
+}
+
+void cloudsStartWalking(CloudsWalker* walker, FuncCloudsWalkingCallback callback, void* data)
+{
+    walker->last_segment.data = data;
+    while (cloudsWalkerPerformStep(walker))
+    {
+        callback(walker);
+    }
 }
--- a/src/rendering/clouds/clo_walking.h
+++ b/src/rendering/clouds/clo_walking.h
@ -15,10 +15,33 @@ extern "C"

 typedef struct
 {
-    Vector3 enter;
-    Vector3 exit;
+    double distance_from_start;
+    Vector3 location;
+    double global_density;
+} CloudWalkerPoint;
+
+/**
+ * Information on a segment yielded by walking.
+ */
+typedef struct
+{
+    Renderer* renderer;
+    CloudsLayerDefinition* layer;
+
+    CloudWalkerPoint start;
+    CloudWalkerPoint end;
    double length;
-} CloudPrimarySegment;
+
+    int refined;
+    /*int subdivision_level;
+    double precision_asked;*/
+
+    void* data;
+} CloudWalkerStepInfo;
+
+typedef struct CloudsWalker CloudsWalker;
+
+typedef void (*FuncCloudsWalkingCallback)(CloudsWalker* walker);

 /**
 * Optimize the search limits in a layer.
@ -31,17 +54,81 @@ typedef struct
 int cloudsOptimizeWalkingBounds(CloudsLayerDefinition* layer, Vector3* start, Vector3* end);

 /**
- * Go through the cloud layer to find segments (parts of the lookup that are likely to contain cloud).
+ * Create a cloud walker.
 *
- * @param renderer The renderer environment
- * @param layer The cloud layer
- * @param start Start position of the lookup
- * @param end End position of the lookup
- * @param max_segments Maximum number of segments to collect
- * @param out_segments Allocated space to fill found segments
- * @return Number of segments found
+ * For better performance, the segment should by optimized using cloudsOptimizeWalkingBounds.
+ * @param renderer Renderer context
+ * @param layer The cloud layer to traverse
+ * @param start Start of the walk
+ * @param end End of the walk
 */
-int cloudsGetLayerPrimarySegments(Renderer* renderer, CloudsLayerDefinition* layer, Vector3 start, Vector3 end, int max_segments, CloudPrimarySegment* out_segments);
+CloudsWalker* cloudsCreateWalker(Renderer* renderer, CloudsLayerDefinition* layer, Vector3 start, Vector3 end);
+
+/**
+ * Delete a cloud walker.
+ *
+ * @param walker The walker to free
+ */
+void cloudsDeleteWalker(CloudsWalker* walker);
+
+/**
+ * Define the segment size for next steps.
+ *
+ * @param walker The walker to configure
+ * @param step The step length, negative for automatic
+ */
+void cloudsWalkerSetStepSize(CloudsWalker* walker, double step);
+
+/**
+ * Perform a single step.
+ *
+ * @param walker The walker to use
+ * @return 1 to continue the loop, 0 to stop
+ */
+int cloudsWalkerPerformStep(CloudsWalker* walker);
+
+/**
+ * Order the walker to stop.
+ *
+ * @param walker The walker to use
+ */
+void cloudsWalkerOrderStop(CloudsWalker* walker);
+
+/**
+ * Order the walker to refine the search for cloud entry or exit.
+ *
+ * The refinement will next yield a shorter version of the segment, containing only the cloud-inside portion, with a
+ * tolerance fixed by precision. For an entry point, this will discard the part before cloud entry. For en exit point,
+ * the portion after this point will be part of the next step, as normal walking resumes.
+ * @param walker The walker to use
+ * @param precision Precision wanted for the refinement
+ */
+void cloudsWalkerOrderRefine(CloudsWalker* walker, double precision);
+
+/**
+ * Order the walker to subdivide the previous segment in smaller segments.
+ *
+ * @param walker The walker to use
+ * @param max_segments Maximal number of segments
+ */
+void cloudsWalkerOrderSubdivide(CloudsWalker* walker, double max_segments);
+
+/**
+ * Get the last segment information.
+ *
+ * @param walker The walker to use
+ */
+CloudWalkerStepInfo* cloudsWalkerGetLastSegment(CloudsWalker* walker);
+
+/**
+ * Start walking automatically through a segment.
+ *
+ * The callback will be called with each segment found, giving info and asking for desired alteration on walking.
+ * @param walker The walker to use
+ * @param callback Callback to be called with each found segment
+ * @param data User data that will be passed back in the callback
+ */
+void cloudsStartWalking(CloudsWalker* walker, FuncCloudsWalkingCallback callback, void* data);

 #ifdef __cplusplus
 }
--- a/src/rendering/clouds/public.h
+++ b/src/rendering/clouds/public.h
@ -80,12 +80,6 @@ LayerType cloudsGetLayerType();
 void cloudsAutoPreset(CloudsDefinition* definition, CloudsPreset preset);
 void cloudsLayerAutoPreset(CloudsLayerDefinition* definition, CloudsLayerPreset preset);

-Renderer* cloudsCreatePreviewCoverageRenderer();
-Color cloudsGetPreviewCoverage(Renderer* renderer, double x, double y, double scaling, int perspective);
-
-Renderer* cloudsCreatePreviewColorRenderer();
-Color cloudsGetPreviewColor(Renderer* renderer, double x, double y);
-
 #ifdef __cplusplus
 }
 #endif
--- a/src/rendering/main.c
+++ b/src/rendering/main.c
@ -2,6 +2,7 @@
 #include <stdlib.h>

 #include "auto.h"
+#include "tools/data.h"
 #include "system.h"
 #include "scenery.h"
 #include "render.h"
@ -13,6 +14,12 @@
 void paysagesInit()
 {
    systemInit();
+    if (!dataInit())
+    {
+        /* TODO Add error callback (for interface) */
+        fprintf(stderr, "ERROR : Can't locate data files.\n");
+        exit(1);
+    }
    openclInit();

    sceneryInit();
--- a/src/rendering/noise.c
+++ b/src/rendering/noise.c
@ -202,17 +202,8 @@ void noiseValidate(NoiseGenerator* generator)
    generator->_max_value = generator->height_offset;
    for (x = 0; x < generator->level_count; x++)
    {
-        double min_value = generator->levels[x].minvalue;
-        double max_value = min_value + generator->levels[x].amplitude;
-
-        if (min_value < generator->_min_value)
-        {
-            generator->_min_value = min_value;
-        }
-        if (max_value > generator->_max_value)
-        {
-            generator->_max_value = max_value;
-        }
+        generator->_min_value += generator->levels[x].minvalue;
+        generator->_max_value += generator->levels[x].minvalue + generator->levels[x].amplitude;
    }
 }

@ -394,14 +385,14 @@ void noiseNormalizeAmplitude(NoiseGenerator* generator, double minvalue, double

    for (level = 0; level < generator->level_count; level++)
    {
-        generator->levels[level].minvalue = minvalue + (generator->levels[level].minvalue - current_minvalue) * factor;
+        generator->levels[level].minvalue *= factor;
        generator->levels[level].amplitude *= factor;
        if (adjust_scaling)
        {
            generator->levels[level].wavelength *= factor;
        }
    }
-    /*generator->height_offset = minvalue + (generator->height_offset - current_minvalue) * factor;*/
+    generator->height_offset = minvalue + (generator->height_offset - current_minvalue) * factor;
    noiseValidate(generator);
 }

--- a/src/rendering/terrain/public.h
+++ b/src/rendering/terrain/public.h
@ -81,6 +81,7 @@ typedef struct

 /* Heightmap manipulation */
 int terrainIsPainted(TerrainHeightMap* heightmap, int x, int z);
+void terrainClearPainting(TerrainHeightMap* heightmap);
 void terrainBrushElevation(TerrainHeightMap* heightmap, TerrainBrush* brush, double value);
 void terrainBrushSmooth(TerrainHeightMap* heightmap, TerrainBrush* brush, double value);
 void terrainBrushAddNoise(TerrainHeightMap* heightmap, TerrainBrush* brush, NoiseGenerator* generator, double value);
--- a/src/rendering/terrain/ter_definition.c
+++ b/src/rendering/terrain/ter_definition.c
@ -27,13 +27,13 @@ static TerrainDefinition* _createDefinition()
 {
    TerrainDefinition* definition = malloc(sizeof(TerrainDefinition));

-    definition->height = 0.0;
+    definition->height = 1.0;
    definition->scaling = 1.0;
    definition->shadow_smoothing = 0.0;

    definition->height_map = terrainHeightMapCreate(definition);

-    definition->water_height = -0.8;
+    definition->water_height = -0.3;

    definition->_height_noise = noiseCreateGenerator();

--- a/src/rendering/terrain/ter_painting.c
+++ b/src/rendering/terrain/ter_painting.c
@ -454,6 +454,12 @@ int terrainIsPainted(TerrainHeightMap* heightmap, int x, int z)
    return _getDataPointer(&heightmap->brush_data, x, z, NULL, NULL, 0) || _getDataPointer(&heightmap->merged_data, x, z, NULL, NULL, 0);
 }

+void terrainClearPainting(TerrainHeightMap* heightmap)
+{
+    _clearData(&heightmap->merged_data);
+    _clearData(&heightmap->brush_data);
+}
+
 typedef double (*BrushCallback)(TerrainHeightMap* heightmap, TerrainBrush* brush, double x, double z, double basevalue, double influence, double force, void* data);

 static inline void _applyBrush(TerrainHeightMap* heightmap, TerrainBrush* brush, double force, void* data, BrushCallback callback)
--- a/src/rendering/terrain/ter_presets.c
+++ b/src/rendering/terrain/ter_presets.c
@ -19,7 +19,7 @@ void terrainAutoPreset(TerrainDefinition* definition, TerrainPreset preset)
        noiseNormalizeAmplitude(definition->_height_noise, -1.0, 1.0, 0);
        noiseSetFunctionParams(definition->_height_noise, NOISE_FUNCTION_SIMPLEX, 0.0, 0.0);
        definition->scaling = 1.0;
-        definition->height = 15.0;
+        definition->height = 30.0;
        definition->shadow_smoothing = 0.03;
        break;
    default:
--- a/src/rendering/tools/data.c
+++ b/src/rendering/tools/data.c
@ -0,0 +1,34 @@
+#include "data.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static const char* _datapath = NULL;
+
+static int _tryDataPath(const char* path)
+{
+    char* buffer;
+
+    buffer = malloc(sizeof (char) * (strlen(path) + 30));
+    strcpy(buffer, path);
+    strcat(buffer, "/.paysages_data");
+
+    FILE* f = fopen(buffer, "r");
+    free(buffer);
+    if (f)
+    {
+        _datapath = path;
+        fclose(f);
+        return 1;
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+int dataInit()
+{
+    return _tryDataPath("./data");
+}
--- a/src/rendering/tools/data.h
+++ b/src/rendering/tools/data.h
@ -0,0 +1,10 @@
+#ifndef _PAYSAGES_TOOLS_DATA_H_
+#define _PAYSAGES_TOOLS_DATA_H_
+
+/*
+ * Data directory management.
+ */
+
+int dataInit();
+
+#endif
--- a/src/testing/common.h
+++ b/src/testing/common.h
@ -29,6 +29,11 @@ static inline void _add_methods_to_case(TCase* tc, ...)
    suite_add_tcase(s, tc); \
 }

+/***** Boolean assertions *****/
+#define ck_assert_true(_X_) ck_assert_int_ne((_X_), 0)
+#define ck_assert_false(_X_) ck_assert_int_eq((_X_), 0)
+
+/***** Floating point assertions *****/
 static inline int _double_equals(double x, double y)
 {
    return fabs(x - y) < 0.00000000001;
@ -39,7 +44,7 @@ static inline int _double_not_equals(double x, double y)
 }
 static inline int _double_greater(double x, double y)
 {
-    return _double_not_equals(x, y) || (x > y);
+    return _double_not_equals(x, y) && (x > y);
 }
 static inline int _double_greater_or_equal(double x, double y)
 {
@ -47,7 +52,7 @@ static inline int _double_greater_or_equal(double x, double y)
 }
 static inline int _double_less(double x, double y)
 {
-    return _double_not_equals(x, y) || (x < y);
+    return _double_not_equals(x, y) && (x < y);
 }
 static inline int _double_less_or_equal(double x, double y)
 {
@ -58,8 +63,8 @@ static inline int _double_less_or_equal(double x, double y)
 #define ck_assert_double_eq(X, Y) _ck_assert_double(_double_equals, X, ==, Y)
 #define ck_assert_double_ne(X, Y) _ck_assert_double(_double_not_equals, X, !=, Y)
 #define ck_assert_double_gt(X, Y) _ck_assert_double(_double_greater, X, >, Y)
-#define ck_assert_double_lt(X, Y) _ck_assert_double(_double_greater_or_equal, X, >=, Y)
-#define ck_assert_double_gte(X, Y) _ck_assert_double(_double_less, X, <, Y)
+#define ck_assert_double_lt(X, Y) _ck_assert_double(_double_less, X, <, Y)
+#define ck_assert_double_gte(X, Y) _ck_assert_double(_double_greater_or_equal, X, >=, Y)
 #define ck_assert_double_lte(X, Y) _ck_assert_double(_double_less_or_equal, X, <=, Y)


--- a/src/testing/main.c
+++ b/src/testing/main.c
@ -9,6 +9,7 @@ extern void test_euclid_case(Suite* s);
 extern void test_camera_case(Suite* s);
 extern void test_clouds_case(Suite* s);
 extern void test_render_case(Suite* s);
+extern void test_noise_case(Suite* s);

 int main(int argc, char** argv)
 {
@ -24,6 +25,7 @@ int main(int argc, char** argv)
    test_camera_case(s);
    test_clouds_case(s);
    test_render_case(s);
+    test_noise_case(s);

    SRunner *sr = srunner_create(s);
    srunner_run_all(sr, CK_NORMAL);
--- a/src/testing/test_clouds.c
+++ b/src/testing/test_clouds.c
@ -200,11 +200,9 @@ static double _getLayerDensitySinX(Renderer* renderer, CloudsLayerDefinition* la
    return (density > 0.0) ? density : 0.0;
 }

-START_TEST(test_clouds_primary_segments)
+START_TEST(test_clouds_walking)
 {
-    int segment_count, i;
-    CloudPrimarySegment segments[10];
-
+    /* Init */
    CloudsLayerDefinition* layer;
    layer = cloudsGetLayerType().callback_create();
    layer->lower_altitude = -1.0;
@ -217,36 +215,88 @@ START_TEST(test_clouds_primary_segments)
    renderer->render_quality = 8;
    renderer->clouds->getLayerDensity = _getLayerDensitySinX;

-    segment_count = cloudsGetLayerPrimarySegments(renderer, layer, v3(-0.4, 0.0, 0.0), v3(1.9, 0.0, 0.0), 10, segments);
-    ck_assert_int_eq(segment_count, 2);
-    for (i = 0; i < segment_count; i++)
-    {
-        ck_assert_double_eq(segments[i].enter.y, 0.0);
-        ck_assert_double_eq(segments[i].enter.z, 0.0);
-        ck_assert_double_eq(segments[i].exit.y, 0.0);
-        ck_assert_double_eq(segments[i].exit.z, 0.0);
-    }
-    ck_assert_double_in_range(segments[0].enter.x, -0.5, 0.0);
-    ck_assert_double_in_range(segments[0].exit.x, 0.5, 1.0);
-    ck_assert_double_in_range(segments[0].length, 0.5, 1.5);
-    ck_assert_double_gte(segments[1].enter.x, segments[0].exit.x);
-    ck_assert_double_in_range(segments[1].enter.x, 0.5, 1.0);
-    ck_assert_double_in_range(segments[1].exit.x, 1.5, 2.0);
-    ck_assert_double_in_range(segments[1].length, 0.5, 1.5);
+    CloudsWalker* walker = cloudsCreateWalker(renderer, layer, v3(-0.4, 0.0, 0.0), v3(10.0, 0.0, 0.0));
+    CloudWalkerStepInfo* segment;
+    int result;
+
+    /* First step */
+    cloudsWalkerSetStepSize(walker, 0.3);
+    result = cloudsWalkerPerformStep(walker);
+    segment = cloudsWalkerGetLastSegment(walker);
+    ck_assert_int_eq(result, 1);
+    ck_assert_false(segment->refined);
+    ck_assert_double_eq(segment->length, 0.3);
+    ck_assert_double_eq(segment->start.distance_from_start, 0.0);
+    ck_assert_vector_values(segment->start.location, -0.4, 0.0, 0.0);
+    ck_assert_double_eq(segment->start.global_density, 0.0);
+    ck_assert_double_eq(segment->end.distance_from_start, 0.3);
+    ck_assert_vector_values(segment->end.location, -0.1, 0.0, 0.0);
+    ck_assert_double_eq(segment->end.global_density, 0.0);
+
+    /* Second step */
+    result = cloudsWalkerPerformStep(walker);
+    segment = cloudsWalkerGetLastSegment(walker);
+    ck_assert_int_eq(result, 1);
+    ck_assert_false(segment->refined);
+    ck_assert_double_eq(segment->length, 0.3);
+    ck_assert_double_eq(segment->start.distance_from_start, 0.3);
+    ck_assert_vector_values(segment->start.location, -0.1, 0.0, 0.0);
+    ck_assert_double_eq(segment->start.global_density, 0.0);
+    ck_assert_double_eq(segment->end.distance_from_start, 0.6);
+    ck_assert_vector_values(segment->end.location, 0.2, 0.0, 0.0);
+    ck_assert_double_gt(segment->end.global_density, 0.9);
+
+    /* Order to refine second step around the entry point */
+    cloudsWalkerOrderRefine(walker, 0.01);
+    result = cloudsWalkerPerformStep(walker);
+    segment = cloudsWalkerGetLastSegment(walker);
+    ck_assert_int_eq(result, 1);
+    ck_assert_true(segment->refined);
+    ck_assert_double_in_range(segment->length, 0.19, 0.20);
+    ck_assert_double_in_range(segment->start.distance_from_start, 0.40, 0.41);
+    ck_assert_double_in_range(segment->start.location.x, 0.0, 0.01);
+    ck_assert_double_gt(segment->start.global_density, 0.0);
+    ck_assert_double_eq(segment->end.distance_from_start, 0.6);
+    ck_assert_vector_values(segment->end.location, 0.2, 0.0, 0.0);
+    ck_assert_double_gt(segment->end.global_density, 0.9);
+
+    /* Third step, change step size */
+    cloudsWalkerSetStepSize(walker, 0.4);
+    result = cloudsWalkerPerformStep(walker);
+    segment = cloudsWalkerGetLastSegment(walker);
+    ck_assert_int_eq(result, 1);
+    ck_assert_false(segment->refined);
+    ck_assert_double_eq(segment->length, 0.4);
+    ck_assert_double_eq(segment->start.distance_from_start, 0.6);
+    ck_assert_vector_values(segment->start.location, 0.2, 0.0, 0.0);
+    ck_assert_double_gt(segment->start.global_density, 0.9);
+    ck_assert_double_eq(segment->end.distance_from_start, 1.0);
+    ck_assert_vector_values(segment->end.location, 0.6, 0.0, 0.0);
+    ck_assert_double_eq(segment->end.global_density, 0.0);
+
+    /* Refine exit point */
+    cloudsWalkerOrderRefine(walker, 0.001);
+    result = cloudsWalkerPerformStep(walker);
+    segment = cloudsWalkerGetLastSegment(walker);
+    ck_assert_int_eq(result, 1);
+    ck_assert_true(segment->refined);
+    ck_assert_double_in_range(segment->length, 0.3, 0.301);
+    ck_assert_double_eq(segment->start.distance_from_start, 0.6);
+    ck_assert_vector_values(segment->start.location, 0.2, 0.0, 0.0);
+    ck_assert_double_gt(segment->start.global_density, 0.9);
+    ck_assert_double_in_range(segment->end.distance_from_start, 0.9, 0.901);
+    ck_assert_double_in_range(segment->end.location.x, 0.5, 0.501);
+    ck_assert_double_lt(segment->end.global_density, 0.1);
+
+    /* Clean up */
+    cloudsDeleteWalker(walker);

    cloudsGetLayerType().callback_delete(layer);
    rendererDelete(renderer);
 }
 END_TEST

-START_TEST(test_clouds_preview_color)
-{
-    Renderer* renderer = cloudsCreatePreviewColorRenderer();
-
-    /* TODO Test the density overriding */
-
-    rendererDelete(renderer);
-}
-END_TEST
-
-TEST_CASE(clouds, test_clouds_density, test_clouds_walking_boundaries, test_clouds_primary_segments, test_clouds_preview_color)
+TEST_CASE(clouds,
+          test_clouds_density,
+          test_clouds_walking_boundaries,
+          test_clouds_walking)
--- a/src/testing/test_noise.c
+++ b/src/testing/test_noise.c
@ -0,0 +1,78 @@
+#include "testing/common.h"
+
+#include "rendering/noise.h"
+
+START_TEST(test_noise_range)
+{
+    NoiseGenerator* noise;
+    double minvalue, maxvalue;
+
+    noise = noiseCreateGenerator();
+
+    noiseAddLevelSimple(noise, 0.1, -1.0, 1.0);
+    noiseAddLevelSimple(noise, 0.2, -0.5, 0.2);
+    noiseAddLevelSimple(noise, 0.4, -0.3, 1.2);
+    noiseValidate(noise);
+    noiseGetRange(noise, &minvalue, &maxvalue);
+
+    ck_assert_double_eq(minvalue, -1.8);
+    ck_assert_double_eq(maxvalue, 2.4);
+}
+END_TEST
+
+START_TEST(test_noise_normalize)
+{
+    int x;
+    NoiseGenerator* noise;
+
+    noise = noiseCreateGenerator();
+
+    /* Symmetric case */
+    noiseAddLevelsSimple(noise, 10, 1.0, -4.0, 4.0, 0.5);
+    noiseValidate(noise);
+    noiseNormalizeAmplitude(noise, -1.0, 1.0, 0);
+    for (x = 0; x < 1000; x++)
+    {
+        double value = noiseGet1DTotal(noise, 0.01 * (double)x);
+        ck_assert_double_in_range(value, -1.0, 1.0);
+    }
+
+    /* Target center differs from current center */
+    noiseClearLevels(noise);
+    noiseAddLevelsSimple(noise, 10, 1.0, -5.0, 5.0, 0.5);
+    noiseValidate(noise);
+    noiseNormalizeAmplitude(noise, 0.0, 1.0, 0);
+    for (x = 0; x < 1000; x++)
+    {
+        double value = noiseGet1DTotal(noise, 0.01 * (double)x);
+        ck_assert_double_in_range(value, 0.0, 1.0);
+    }
+
+    /* Asymmetric range */
+    noiseClearLevels(noise);
+    noiseAddLevelsSimple(noise, 10, 1.0, 0.0, 10.0, 0.0);
+    noiseValidate(noise);
+    noiseNormalizeAmplitude(noise, 0.0, 1.0, 0);
+    for (x = 0; x < 1000; x++)
+    {
+        double value = noiseGet1DTotal(noise, 0.01 * (double)x);
+        ck_assert_double_in_range(value, 0.0, 1.0);
+    }
+
+    /* Complex asymmetric case */
+    noiseClearLevels(noise);
+    noiseAddLevelsSimple(noise, 3, 1.0, -2.0, 8.0, 0.3);
+    noiseValidate(noise);
+    noiseNormalizeAmplitude(noise, -2.0, 4.0, 0.0);
+    for (x = 0; x < 1000; x++)
+    {
+        double value = noiseGet1DTotal(noise, 0.01 * (double)x);
+        ck_assert_double_in_range(value, -2.0, 4.0);
+    }
+
+    noiseDeleteGenerator(noise);
+}
+END_TEST
+
+TEST_CASE(noise, test_noise_range, test_noise_normalize)
+