diff --git a/TODO b/TODO
index 7d0fe9e..f209f77 100644
--- a/TODO
+++ b/TODO
@@ -16,6 +16,7 @@ Technology Preview 2 :
    => Add detail boost (adds granularity)
    => Add step boost (for marching algorithms)
 - Waves noise should not change layers offsets each time a setting is changed (layers are reconstructed currently).
+- Fix rendering when inside a cloud layer, with other upper or lower layers.
 - Add "hardness to light" and shadow control ("minimum lighting") to material.
 
 Technlogy Preview 3 :
diff --git a/gui_qt/basepreview.cpp b/gui_qt/basepreview.cpp
index b6e1af7..a856c5d 100644
--- a/gui_qt/basepreview.cpp
+++ b/gui_qt/basepreview.cpp
@@ -427,7 +427,7 @@ void BasePreview::updateData()
 {
 }
 
-QColor BasePreview::getColor(double x, double y)
+QColor BasePreview::getColor(double, double)
 {
     return QColor(0, 0, 0);
 }
@@ -606,7 +606,7 @@ void BasePreview::choiceSelected(QAction* action)
     }
 }
 
-void BasePreview::showEvent(QShowEvent* event)
+void BasePreview::showEvent(QShowEvent*)
 {
     updateChunks();
 }
@@ -643,7 +643,7 @@ void BasePreview::resizeEvent(QResizeEvent* event)
     this->_lock_drawing->unlock();
 }
 
-void BasePreview::paintEvent(QPaintEvent* event)
+void BasePreview::paintEvent(QPaintEvent*)
 {
     QPainter painter(this);
     painter.drawImage(0, 0, *this->_pixbuf);
@@ -964,7 +964,7 @@ void BasePreview::wheelEvent(QWheelEvent* event)
     event->accept();
 }
 
-void BasePreview::leaveEvent(QEvent* event)
+void BasePreview::leaveEvent(QEvent*)
 {
     _info->setVisible(false);
 }
diff --git a/gui_qt/dialogrender.cpp b/gui_qt/dialogrender.cpp
index 46d5675..773c084 100644
--- a/gui_qt/dialogrender.cpp
+++ b/gui_qt/dialogrender.cpp
@@ -58,7 +58,7 @@ public:
         setMinimumSize(800, 600);
     }
 
-    void paintEvent(QPaintEvent* event)
+    void paintEvent(QPaintEvent*)
     {
         QPainter painter(this);
         painter.drawImage(0, 0, *_current_dialog->pixbuf);
diff --git a/gui_qt/formtextures.cpp b/gui_qt/formtextures.cpp
index bd17dad..8b4db04 100644
--- a/gui_qt/formtextures.cpp
+++ b/gui_qt/formtextures.cpp
@@ -179,10 +179,18 @@ void FormTextures::applyConfig()
 
 void FormTextures::layerGetCopy(void* layer_definition)
 {
-    texturesLayerCopyDefinition((TextureLayerDefinition*)layer_definition, _layer);
+    TextureLayerDefinition* source = (TextureLayerDefinition*)layer_definition;
+    texturesLayerCopyDefinition(source, _layer);
+
+    zoneGetHeightCurve(source->zone, _supp.height_curve);
+    zoneGetSlopeCurve(source->zone, _supp.slope_curve);
 }
 
 void FormTextures::layerApply(void* layer_definition)
 {
-    texturesLayerCopyDefinition(_layer, (TextureLayerDefinition*)layer_definition);
+    TextureLayerDefinition* destination = (TextureLayerDefinition*)layer_definition;
+    texturesLayerCopyDefinition(_layer, destination);
+    
+    zoneSetHeightCurve(destination->zone, _supp.height_curve);
+    zoneSetSlopeCurve(destination->zone, _supp.slope_curve);
 }
diff --git a/gui_qt/inputcolor.cpp b/gui_qt/inputcolor.cpp
index e858e0e..db6bdbe 100644
--- a/gui_qt/inputcolor.cpp
+++ b/gui_qt/inputcolor.cpp
@@ -4,6 +4,7 @@
 #include <QPushButton>
 #include <QPainter>
 #include <QColorDialog>
+#include "tools.h"
 
 class ColorPreview:public QWidget
 {
@@ -13,7 +14,7 @@ public:
     {
     }
 
-    void paintEvent(QPaintEvent* event)
+    void paintEvent(QPaintEvent*)
     {
         QPainter painter(this);
         painter.fillRect(this->rect(), col);
@@ -50,7 +51,7 @@ void InputColor::applyValue()
 
 void InputColor::revert()
 {
-    ((ColorPreview*)_preview)->col = QColor::fromRgbF(_value->r, _value->g, _value->b);
+    ((ColorPreview*)_preview)->col = colorToQColor(*_value);
     BaseInput::revert();
 }
 
diff --git a/gui_qt/inputcurve.cpp b/gui_qt/inputcurve.cpp
index 6058cda..baa0b15 100644
--- a/gui_qt/inputcurve.cpp
+++ b/gui_qt/inputcurve.cpp
@@ -4,6 +4,7 @@
 #include <QPushButton>
 #include <QPainter>
 #include "dialogcurve.h"
+#include "tools.h"
 
 class CurveSmallPreview:public QWidget
 {
@@ -17,13 +18,13 @@ public:
         _ymax = ymax;
     }
 
-    void paintEvent(QPaintEvent* event)
+    void paintEvent(QPaintEvent*)
     {
         if (!_curve)
         {
             return;
         }
-
+        
         QPainter painter(this);
         int width = this->width();
         int height = this->height();
diff --git a/gui_qt/inputdouble.cpp b/gui_qt/inputdouble.cpp
index 39b2226..8583dd2 100644
--- a/gui_qt/inputdouble.cpp
+++ b/gui_qt/inputdouble.cpp
@@ -39,22 +39,28 @@ void InputDouble::updatePreview()
     BaseInput::updatePreview();
 }
 
-void InputDouble::applyValue()
+double InputDouble::getValue()
 {
+    double result;
     int ivalue = _slider->value();
     if (ivalue == _slider->maximum())
     {
-        *_value = _max;
+        result = _max;
     }
     else
     {
-        *_value = _min + ((double)ivalue) * _small_step;
+        result = _min + ((double)ivalue) * _small_step;
     }
     if (fabs(*_value) < 0.0000001)
     {
-        *_value = 0.0;
+        result = 0.0;
     }
+    return result;
+}
 
+void InputDouble::applyValue()
+{
+    *_value = getValue();
     BaseInput::applyValue();
 }
 
diff --git a/gui_qt/inputdouble.h b/gui_qt/inputdouble.h
index 6df19e0..89115c5 100644
--- a/gui_qt/inputdouble.h
+++ b/gui_qt/inputdouble.h
@@ -16,6 +16,9 @@ public slots:
     virtual void updatePreview();
     virtual void applyValue();
     virtual void revert();
+    
+protected:
+    double getValue();
 
 private:
     QSlider* _slider;
diff --git a/gui_qt/inputint.cpp b/gui_qt/inputint.cpp
index 016e8bf..15ded3d 100644
--- a/gui_qt/inputint.cpp
+++ b/gui_qt/inputint.cpp
@@ -16,7 +16,7 @@ void InputInt::updatePreview()
 
 void InputInt::applyValue()
 {
-    *_value = (int)_dvalue;
+    *_value = (int)getValue();
 
     InputDouble::applyValue();
 }
diff --git a/lib_paysages/color.c b/lib_paysages/color.c
index 34bc0f3..227907c 100644
--- a/lib_paysages/color.c
+++ b/lib_paysages/color.c
@@ -127,6 +127,7 @@ double colorNormalize(Color* col)
 {
     double max = colorGetValue(col);
 
+    assert(max >= 0.0);
     assert(col->r >= 0.0);
     assert(col->g >= 0.0);
     assert(col->b >= 0.0);
diff --git a/lib_paysages/water.c b/lib_paysages/water.c
index 58a8413..f0f6aed 100644
--- a/lib_paysages/water.c
+++ b/lib_paysages/water.c
@@ -61,6 +61,8 @@ WaterDefinition waterCreateDefinition()
     result.height = -4.0;
     result._waves_noise = noiseCreateGenerator();
     
+    waterAutoPreset(&result, WATER_PRESET_LAKE);
+    
     return result;
 }
 
@@ -115,6 +117,7 @@ void waterAutoPreset(WaterDefinition* definition, WaterPreset preset)
     definition->foam_material.base.r = 0.8;
     definition->foam_material.base.g = 0.8;
     definition->foam_material.base.b = 0.8;
+    definition->foam_material.base.a = 1.0;
     definition->foam_material.reflection = 0.4;
     definition->foam_material.shininess = 1.5;