diff --git a/TODO b/TODO
index e5547c4..b1c6ce5 100644
--- a/TODO
+++ b/TODO
@@ -1,4 +1,5 @@
 Technology Preview 2 :
+- Create a StandardPreviewClass (with renderer, updateData, changeView, getColor, choices and toggles).
 - Replace terrain canvas editor by full sculpting editor.
    => Add a generation dialog, with fixed resolution.
    => Store local terrain modifications in fully dynamic canvas.
diff --git a/gui_qt/formrender.cpp b/gui_qt/formrender.cpp
index 143481a..a7d35bc 100644
--- a/gui_qt/formrender.cpp
+++ b/gui_qt/formrender.cpp
@@ -17,14 +17,12 @@ public:
         _renderer->getCameraLocation = _getCameraLocation;
 
         _textures = texturesCreateDefinition();
-        _water = waterCreateDefinition();
 
         _atmosphere = (AtmosphereDefinition*)AtmosphereDefinitionClass.create();
         _terrain = (TerrainDefinition*)TerrainDefinitionClass.create();
+        _water = (WaterDefinition*)WaterDefinitionClass.create();
 
-        _renderer->customData[0] = &_terrain;
-        _renderer->customData[1] = &_textures;
-        _renderer->customData[3] = &_water;
+        _renderer->customData[0] = &_textures;
 
         addOsd(QString("geolocation"));
 
@@ -35,16 +33,12 @@ public:
 protected:
     Color getColor(double x, double y)
     {
-        Vector3 down = {0.0, -1.0, 0.0};
         Vector3 location;
         double height = _renderer->terrain->getHeight(_renderer, x, y, 1);
 
-        if (height < _water.height)
+        if (height < _water->height)
         {
-            location.x = x;
-            location.y = _water.height;
-            location.z = y;
-            return waterGetColor(&_water, _renderer, location, down);
+            return _renderer->water->getResult(_renderer, x, y).final;
         }
         else
         {
@@ -57,7 +51,9 @@ protected:
     void updateData()
     {
         sceneryGetTextures(&_textures);
-        sceneryGetWater(&_water);
+
+        sceneryGetWater(_water);
+        WaterRendererClass.bind(_renderer, _water);
 
         sceneryGetAtmosphere(_atmosphere);
         AtmosphereRendererClass.bind(_renderer, _atmosphere);
@@ -69,13 +65,13 @@ protected:
 private:
     Renderer* _renderer;
     TerrainDefinition* _terrain;
-    WaterDefinition _water;
+    WaterDefinition *_water;
     TexturesDefinition _textures;
     AtmosphereDefinition* _atmosphere;
 
     static Color _applyTextures(Renderer* renderer, Vector3 location, double precision)
     {
-        return texturesGetColor((TexturesDefinition*)(renderer->customData[1]), renderer, location.x, location.z, precision);
+        return texturesGetColor((TexturesDefinition*)(renderer->customData[0]), renderer, location.x, location.z, precision);
     }
 
     static Vector3 _getCameraLocation(Renderer*, Vector3 location)
diff --git a/gui_qt/formwater.cpp b/gui_qt/formwater.cpp
index 6650379..bfc0c45 100644
--- a/gui_qt/formwater.cpp
+++ b/gui_qt/formwater.cpp
@@ -3,6 +3,7 @@
 
 #include <QColor>
 #include <QSlider>
+#include <math.h>
 
 #include "../lib_paysages/tools/euclid.h"
 #include "../lib_paysages/tools/lighting.h"
@@ -64,13 +65,10 @@ public:
         _background = 0;
         _lighting_enabled = false;
 
-        _water = waterCreateDefinition();
-
         _renderer = rendererCreate();
         _renderer->atmosphere->getLightingStatus = _getLightingStatus;
         _renderer->rayWalking = _rayWalking;
-        _renderer->customData[0] = &_water;
-        _renderer->customData[2] = this;
+        _renderer->customData[0] = this;
 
         configScaling(10.0, 1000.0, 10.0, 250.0);
         //configScrolling(-30.0, 30.0, 0.0, -20.0, 20.0, 0.0);
@@ -83,7 +81,8 @@ public:
 protected:
     Color getColor(double x, double y)
     {
-        Vector3 eye, look, location;
+        Vector3 eye, look;
+        double target_x, target_z;
 
         // TODO Camera location
         eye.x = 0.0;
@@ -99,20 +98,19 @@ protected:
             return _rayWalking(_renderer, eye, look, 0, 0, 0, 0).hit_color;
         }
 
-        location.x = eye.x - look.x * eye.y / look.y;
-        location.y = 0.0;
-        location.z = eye.z - look.z * eye.y / look.y;
+        target_x = eye.x - look.x * eye.y / look.y;
+        target_z = eye.z - look.z * eye.y / look.y;
 
-        if (location.z > 0.0)
+        if (target_z > 0.0)
         {
             return _rayWalking(_renderer, eye, look, 0, 0, 0, 0).hit_color;
         }
 
-        return waterGetColor(&_water, _renderer, location, look);
+        return _renderer->water->getResult(_renderer, target_x, target_z).final;
     }
     void updateData()
     {
-        waterCopyDefinition(&_definition, &_water);
+        WaterRendererClass.bind(_renderer, _definition);
         _water.height = 0.0;
     }
     void choiceChangeEvent(const QString& key, int position)
@@ -139,7 +137,7 @@ private:
     static RayCastingResult _rayWalking(Renderer* renderer, Vector3 location, Vector3 direction, int, int, int, int)
     {
         RayCastingResult result;
-        PreviewWaterColor* preview = (PreviewWaterColor*)renderer->customData[2];
+        PreviewWaterColor* preview = (PreviewWaterColor*)renderer->customData[0];
         double x, y;
 
         result.hit = 1;
@@ -199,51 +197,51 @@ FormWater::FormWater(QWidget *parent):
     addAutoPreset(tr("Lake surface"));
     addAutoPreset(tr("Standard sea"));
 
-    _definition = waterCreateDefinition();
+    _definition = (WaterDefinition*)WaterDefinitionClass.create();
 
     previewCoverage = new PreviewWaterCoverage(this);
     previewColor = new PreviewWaterColor(this);
     addPreview(previewCoverage, tr("Coverage preview"));
     addPreview(previewColor, tr("Rendered preview"));
 
-    addInputDouble(tr("Height"), &_definition.height, -15.0, 15.0, 0.1, 1.0);
-    addInputMaterial(tr("Surface material"), &_definition.material);
-    addInputColor(tr("Depth color"), &_definition.depth_color);
-    addInputDouble(tr("Transparency"), &_definition.transparency, 0.0, 1.0, 0.001, 0.1);
-    addInputDouble(tr("Reflection"), &_definition.reflection, 0.0, 1.0, 0.001, 0.1);
-    addInputDouble(tr("Transparency distance"), &_definition.transparency_depth, 0.0, 20.0, 0.1, 1.0);
-    addInputDouble(tr("Light-through distance"), &_definition.lighting_depth, 0.0, 20.0, 0.1, 1.0);
-    addInputDouble(tr("Waves scaling"), &_definition.scaling, 0.02, 2.0, 0.02, 0.2);
-    addInputDouble(tr("Waves height"), &_definition.waves_height, 0.0, 2.0, 0.02, 0.2);
-    addInputDouble(tr("Waves detail"), &_definition.detail_height, 0.0, 0.3, 0.003, 0.03);
-    addInputDouble(tr("Waves turbulence"), &_definition.turbulence, 0.0, 0.5, 0.005, 0.05);
-    addInputDouble(tr("Foam coverage"), &_definition.foam_coverage, 0.0, 1.0, 0.01, 0.1);
-    addInputMaterial(tr("Foam material"), &_definition.foam_material);
+    addInputDouble(tr("Height"), &_definition->height, -15.0, 15.0, 0.1, 1.0);
+    addInputMaterial(tr("Surface material"), &_definition->material);
+    addInputColor(tr("Depth color"), &_definition->depth_color);
+    addInputDouble(tr("Transparency"), &_definition->transparency, 0.0, 1.0, 0.001, 0.1);
+    addInputDouble(tr("Reflection"), &_definition->reflection, 0.0, 1.0, 0.001, 0.1);
+    addInputDouble(tr("Transparency distance"), &_definition->transparency_depth, 0.0, 20.0, 0.1, 1.0);
+    addInputDouble(tr("Light-through distance"), &_definition->lighting_depth, 0.0, 20.0, 0.1, 1.0);
+    addInputDouble(tr("Waves scaling"), &_definition->scaling, 0.02, 2.0, 0.02, 0.2);
+    addInputDouble(tr("Waves height"), &_definition->waves_height, 0.0, 2.0, 0.02, 0.2);
+    addInputDouble(tr("Waves detail"), &_definition->detail_height, 0.0, 0.3, 0.003, 0.03);
+    addInputDouble(tr("Waves turbulence"), &_definition->turbulence, 0.0, 0.5, 0.005, 0.05);
+    addInputDouble(tr("Foam coverage"), &_definition->foam_coverage, 0.0, 1.0, 0.01, 0.1);
+    addInputMaterial(tr("Foam material"), &_definition->foam_material);
 
     revertConfig();
 }
 
 void FormWater::revertConfig()
 {
-    sceneryGetWater(&_definition);
+    sceneryGetWater(_definition);
     BaseForm::revertConfig();
 }
 
 void FormWater::applyConfig()
 {
-    scenerySetWater(&_definition);
+    scenerySetWater(_definition);
     BaseForm::applyConfig();
 }
 
 void FormWater::configChangeEvent()
 {
-    waterValidateDefinition(&_definition);
+    WaterDefinitionClass.validate(_definition);
     BaseForm::configChangeEvent();
 }
 
 void FormWater::autoPresetSelected(int preset)
 {
-    waterAutoPreset(&_definition, (WaterPreset)preset);
+    waterAutoPreset(_definition, (WaterPreset)preset);
     BaseForm::autoPresetSelected(preset);
 }
 
diff --git a/gui_qt/widgetexplorer.cpp b/gui_qt/widgetexplorer.cpp
index 4009b3d..6081fa3 100644
--- a/gui_qt/widgetexplorer.cpp
+++ b/gui_qt/widgetexplorer.cpp
@@ -67,8 +67,6 @@ WidgetExplorer::WidgetExplorer(QWidget *parent, CameraDefinition* camera):
     _base_camera = camera;
     cameraCopyDefinition(camera, &_current_camera);
 
-    _water = waterCreateDefinition();
-    sceneryGetWater(&_water);
     _textures = texturesCreateDefinition();
     sceneryGetTextures(&_textures);
 
@@ -76,7 +74,6 @@ WidgetExplorer::WidgetExplorer(QWidget *parent, CameraDefinition* camera):
     _renderer->render_quality = 3;
     _renderer->customData[1] = &_textures;
     _renderer->customData[2] = _base_camera;
-    _renderer->customData[3] = &_water;
     _renderer->applyTextures = _applyTextures;
     _renderer->getCameraLocation = _getCameraLocation;
 
@@ -99,7 +96,6 @@ WidgetExplorer::~WidgetExplorer()
     {
         delete _chunks[i];
     }
-    waterDeleteDefinition(&_water);
     rendererDelete(_renderer);
 }
 
@@ -110,7 +106,7 @@ void WidgetExplorer::startRendering()
     double size = 400.0;
     double chunksize = size / (double)chunks;
     double start = -size / 2.0;
-    double water_height = _renderer->getWaterHeightInfo(_renderer).base_height;
+    double water_height = _renderer->water->getHeightInfo(_renderer).base_height;
     for (int i = 0; i < chunks; i++)
     {
         for (int j = 0; j < chunks; j++)
@@ -402,6 +398,7 @@ void WidgetExplorer::paintGL()
     GLenum error_code;
     QTime start_time;
     double frame_time;
+    WaterDefinition* water = _renderer->water->definition;
 
     cameraCopyDefinition(&_current_camera, &_renderer->render_camera);
     cameraValidateDefinition(&_current_camera, 1);
@@ -418,12 +415,12 @@ void WidgetExplorer::paintGL()
 
     // Render water
     glDisable(GL_TEXTURE_2D);
-    glColor3f(_water.material.base.r, _water.material.base.g, _water.material.base.b);
+    glColor3f(water->material.base.r, water->material.base.g, water->material.base.b);
     glBegin(GL_QUADS);
-    glVertex3f(_current_camera.location.x - 500.0, _water.height, _current_camera.location.z - 500.0);
-    glVertex3f(_current_camera.location.x - 500.0, _water.height, _current_camera.location.z + 500.0);
-    glVertex3f(_current_camera.location.x + 500.0, _water.height, _current_camera.location.z + 500.0);
-    glVertex3f(_current_camera.location.x + 500.0, _water.height, _current_camera.location.z - 500.0);
+    glVertex3f(_current_camera.location.x - 500.0, water->height, _current_camera.location.z - 500.0);
+    glVertex3f(_current_camera.location.x - 500.0, water->height, _current_camera.location.z + 500.0);
+    glVertex3f(_current_camera.location.x + 500.0, water->height, _current_camera.location.z + 500.0);
+    glVertex3f(_current_camera.location.x + 500.0, water->height, _current_camera.location.z - 500.0);
     glEnd();
 
     // Render chunks
diff --git a/gui_qt/widgetexplorer.h b/gui_qt/widgetexplorer.h
index 9133048..4d63c07 100644
--- a/gui_qt/widgetexplorer.h
+++ b/gui_qt/widgetexplorer.h
@@ -4,7 +4,6 @@
 #include <QGLWidget>
 #include "baseexplorerchunk.h"
 #include "../lib_paysages/camera.h"
-#include "../lib_paysages/water.h"
 #include "../lib_paysages/renderer.h"
 #include "../lib_paysages/textures.h"
 
@@ -48,7 +47,6 @@ private:
     bool _alive;
     QMutex _lock_chunks;
 
-    WaterDefinition _water;
     TexturesDefinition _textures;
 
     double _average_frame_time;
diff --git a/lib_paysages/Makefile b/lib_paysages/Makefile
index 0b38be3..a04a88a 100644
--- a/lib_paysages/Makefile
+++ b/lib_paysages/Makefile
@@ -1,7 +1,7 @@
 BUILDMODE = debug
 BUILDPATH = ../build/${BUILDMODE}
 OBJPATH = ./obj/${BUILDMODE}
-SOURCES = $(wildcard *.c atmosphere/*.c clouds/*.c terrain/*.c water/*.c tools/*.c)
+SOURCES = $(wildcard *.c atmosphere/*.c clouds/*.c terrain/*.c water/*.c tools/*.c shared/*.c)
 OBJECTS = ${SOURCES:%.c=${OBJPATH}/%.o}
 HEADERS = $(wildcard *.h atmosphere/*.h clouds/*.h terrain/*.h water/*.h tools/*.h shared/*.h)
 RESULT = ${BUILDPATH}/libpaysages.so
diff --git a/lib_paysages/shared/preview.c b/lib_paysages/shared/preview.c
new file mode 100644
index 0000000..279bd73
--- /dev/null
+++ b/lib_paysages/shared/preview.c
@@ -0,0 +1,49 @@
+#include "preview.h"
+#include "renderer.h"
+
+#include <stdlib.h>
+#include "../renderer.h"
+#include "../camera.h"
+
+struct PreviewRenderer
+{
+    Renderer* renderer;
+};
+
+static PreviewRenderer* _createRenderer()
+{
+    PreviewRenderer* renderer;
+
+    renderer = (PreviewRenderer*)malloc(sizeof(PreviewRenderer));
+    renderer->renderer = rendererCreate();
+
+    return renderer;
+}
+
+static void _deleteRenderer(PreviewRenderer* renderer)
+{
+    rendererDelete(renderer->renderer);
+    free(renderer);
+}
+
+static void _setCamera(PreviewRenderer* renderer, Vector3 location, Vector3 target)
+{
+    cameraSetLocation(renderer->renderer->render_camera, location);
+    cameraSetTarget(renderer->renderer->render_camera, target);
+}
+
+PreviewClass previewCreateClass(FuncPreviewCustomizeRenderer customizeRenderer, FuncPreviewBindDefinition bindDefinition, FuncPreviewGetPixelColor getPixelColor)
+{
+    PreviewClass result;
+
+    result.createRenderer = _createRenderer;
+    result.deleteRenderer = _deleteRenderer;
+
+    result.setCamera = _setCamera;
+
+    result.customizeRenderer = customizeRenderer;
+    result.bindDefinition = bindDefinition;
+    result.getPixelColor = getPixelColor;
+
+    return result;
+}
diff --git a/lib_paysages/shared/preview.h b/lib_paysages/shared/preview.h
new file mode 100644
index 0000000..47f3b77
--- /dev/null
+++ b/lib_paysages/shared/preview.h
@@ -0,0 +1,37 @@
+#ifndef _PAYSAGES_SHARED_PREVIEW_H_
+#define _PAYSAGES_SHARED_PREVIEW_H_
+
+/*
+ * Preview management.
+ */
+
+#include "types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct PreviewRenderer PreviewRenderer;
+
+typedef void (*FuncPreviewCustomizeRenderer)(PreviewRenderer* preview_renderer, Renderer* renderer);
+typedef void (*FuncPreviewBindDefinition)(PreviewRenderer* renderer, void* definition);
+typedef Color (*FuncPreviewGetPixelColor)(PreviewRenderer* renderer, double x, double y, double scaling);
+
+typedef struct {
+    PreviewRenderer* (*createRenderer)();
+    void (*deleteRenderer)(PreviewRenderer* renderer);
+
+    void (*setCamera)(PreviewRenderer* renderer, Vector3 location, Vector3 target);
+
+    FuncPreviewCustomizeRenderer customizeRenderer;
+    FuncPreviewBindDefinition bindDefinition;
+    FuncPreviewGetPixelColor getPixelColor;
+} PreviewClass;
+
+PreviewClass previewCreateClass(FuncPreviewCustomizeRenderer customizeRenderer, FuncPreviewBindDefinition bindDefinition, FuncPreviewGetPixelColor getPixelColor);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/lib_paysages/water/preview.c b/lib_paysages/water/preview.c
index af7a160..dff0644 100644
--- a/lib_paysages/water/preview.c
+++ b/lib_paysages/water/preview.c
@@ -14,7 +14,7 @@ Color waterGetPreviewCoverage(Renderer* renderer, double x, double y, double sca
     double height;
 
     height = renderer->terrain->getHeight(renderer, x, y, 1);
-    if (height > renderer->water->definition.height)
+    if (height > renderer->water->definition->height)
     {
         return terrainGetPreviewColor(renderer, x, y, scaling);
     }
@@ -34,11 +34,11 @@ Color waterGetPreviewCoverage(Renderer* renderer, double x, double y, double sca
     }
 }
 
-Renderer* waterCreatePreviewColorRenderer()
+/*Renderer* waterCreatePreviewColorRenderer()
 {
 }
 
 Color waterGetPreviewColor(Renderer* renderer, double x, double y, double scaling)
 {
 
-}
+}*/
diff --git a/lib_paysages/water/render.c b/lib_paysages/water/render.c
index 54f4e49..3b5bb05 100644
--- a/lib_paysages/water/render.c
+++ b/lib_paysages/water/render.c
@@ -297,7 +297,7 @@ static void _bindRenderer(Renderer* renderer, WaterDefinition* definition)
     lightingManagerRegisterFilter(renderer->lighting, (FuncLightingAlterLight)_alterLight, renderer);
 }
 
-StandardRenderer CloudsRendererClass = {
+StandardRenderer WaterRendererClass = {
     (FuncObjectCreate)_createRenderer,
     (FuncObjectDelete)_deleteRenderer,
     (FuncObjectBind)_bindRenderer