diff --git a/gui_qt/inputheightmap.cpp b/gui_qt/inputheightmap.cpp
index 640040d..036db27 100644
--- a/gui_qt/inputheightmap.cpp
+++ b/gui_qt/inputheightmap.cpp
@@ -14,8 +14,33 @@ public:
 
     void paintEvent(QPaintEvent* event)
     {
+        double min, max, value, fx, fy;
+        int ivalue;
         QPainter painter(this);
-        painter.fillRect(this->rect(), Qt::black);
+        
+        heightmapGetLimits(_value, &min, &max);
+        if (max - min < 0.000001)
+        {
+            painter.fillRect(rect(), Qt::black);
+            return;
+        }
+        
+        fx = 1.0 / (double)(width() - 1);
+        fy = 1.0 / (double)(height() - 1);
+        for (int x = 0; x < width(); x++)
+        {
+            for (int y = 0; y < height(); y++)
+            {
+                value = heightmapGetRawValue(_value, fx * x, fy * y);
+                ivalue = (int)(255.0 * (value - min) / (max - min));
+                if (ivalue > 255 || ivalue < 0)
+                {
+                    ivalue = 128;
+                }
+                painter.setPen(QColor(ivalue, ivalue, ivalue));
+                painter.drawPoint(x, y);
+            }
+        }
     }
     HeightMap* _value;
 };
@@ -25,7 +50,7 @@ InputHeightMap::InputHeightMap(QWidget* form, QString label, HeightMap* value) :
     _value = value;
     
     _preview = new SmallPreviewHeightMap(form, value);
-    _preview->setMinimumSize(100, 40);
+    _preview->setMinimumSize(100, 100);
     
     _control = new QPushButton(tr("Paint"), form);
     _control->setMaximumWidth(150);
diff --git a/gui_qt/widgetheightmap.cpp b/gui_qt/widgetheightmap.cpp
index 0737b98..26fd766 100644
--- a/gui_qt/widgetheightmap.cpp
+++ b/gui_qt/widgetheightmap.cpp
@@ -27,6 +27,7 @@ WidgetHeightMap::WidgetHeightMap(QWidget *parent, HeightMap* heightmap):
     _last_brush_action = 0;
     _last_mouse_x = 0;
     _last_mouse_y = 0;
+    _mouse_moved = false;
     
     _angle_h = 0.0;
     _angle_v = 0.3;
@@ -149,6 +150,7 @@ void WidgetHeightMap::mouseMoveEvent(QMouseEvent* event)
     
     _last_mouse_x = event->x();
     _last_mouse_y = event->y();
+    _mouse_moved = true;
 
     updateGL();
 }
@@ -238,24 +240,28 @@ void WidgetHeightMap::paintGL()
     }
     
     // Picking mouse position using z-buffer (for brush)
-    GLint viewport[4];
-    GLdouble modelview[16];
-    GLdouble projection[16];
-    GLfloat winX, winY, winZ;
-    Vector3 point;
+    if (_mouse_moved)
+    {
+        GLint viewport[4];
+        GLdouble modelview[16];
+        GLdouble projection[16];
+        GLfloat winX, winY, winZ;
+        Vector3 point;
 
-    glGetDoublev(GL_MODELVIEW_MATRIX, modelview);
-    glGetDoublev(GL_PROJECTION_MATRIX, projection);
-    glGetIntegerv(GL_VIEWPORT, viewport);
+        glGetDoublev(GL_MODELVIEW_MATRIX, modelview);
+        glGetDoublev(GL_PROJECTION_MATRIX, projection);
+        glGetIntegerv(GL_VIEWPORT, viewport);
 
-    winX = (float)_last_mouse_x;
-    winY = (float)height() - (float)_last_mouse_y;
-    glReadPixels(_last_mouse_x, (int)winY, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &winZ);
+        winX = (float)_last_mouse_x;
+        winY = (float)height() - (float)_last_mouse_y;
+        glReadPixels(_last_mouse_x, (int)winY, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &winZ);
 
-    gluUnProject(winX, winY, winZ, modelview, projection, viewport, &point.x, &point.y, &point.z);
+        gluUnProject(winX, winY, winZ, modelview, projection, viewport, &point.x, &point.y, &point.z);
 
-    _brush_x = point.x;
-    _brush_z = point.z;
+        _brush_x = point.x;
+        _brush_z = point.z;
+        _mouse_moved = false;
+    }
     
     // Place camera
     glMatrixMode(GL_MODELVIEW);
diff --git a/gui_qt/widgetheightmap.h b/gui_qt/widgetheightmap.h
index 3bddf33..89879ab 100644
--- a/gui_qt/widgetheightmap.h
+++ b/gui_qt/widgetheightmap.h
@@ -60,6 +60,7 @@ private:
     int _last_brush_action;
     int _last_mouse_x;
     int _last_mouse_y;
+    bool _mouse_moved;
     
     double _angle_h;
     double _angle_v;
diff --git a/lib_paysages/heightmap.c b/lib_paysages/heightmap.c
index ddad363..cc253e1 100644
--- a/lib_paysages/heightmap.c
+++ b/lib_paysages/heightmap.c
@@ -87,6 +87,35 @@ void heightmapChangeResolution(HeightMap* heightmap, int resolution_x, int resol
     }
 }
 
+double heightmapGetLimits(HeightMap* heightmap, double* ymin, double* ymax)
+{
+    double y;
+    int i;
+    *ymin = 1000000.0;
+    *ymax = -1000000.0;
+    /* TODO Keep the value in cache */
+    for (i = 0; i < heightmap->resolution_x * heightmap->resolution_z; i++)
+    {
+        y = heightmap->data[i];
+        if (y < *ymin)
+        {
+            *ymin = y;
+        }
+        if (y > *ymax)
+        {
+            *ymax = y;
+        }
+    }
+}
+
+double heightmapGetRawValue(HeightMap* heightmap, double x, double z)
+{
+    assert(x >= 0.0 && x <= 1.0);
+    assert(z >= 0.0 && z <= 1.0);
+    
+    return heightmap->data[((int)(z * (double)(heightmap->resolution_z - 1))) * heightmap->resolution_x + ((int)(x * (double)(heightmap->resolution_x - 1)))];
+}
+
 double heightmapGetValue(HeightMap* heightmap, double x, double z)
 {
     int xmax = heightmap->resolution_x - 1;
diff --git a/lib_paysages/heightmap.h b/lib_paysages/heightmap.h
index 16e58ba..5c89e6f 100644
--- a/lib_paysages/heightmap.h
+++ b/lib_paysages/heightmap.h
@@ -32,10 +32,12 @@ void heightmapValidate(HeightMap* heightmap);
 void heightmapSave(PackStream* stream, HeightMap* heightmap);
 void heightmapLoad(PackStream* stream, HeightMap* heightmap);
 
-void heightmapImportFromPicture(HeightMap* heightmap, const char* picturepath);
+double heightmapGetLimits(HeightMap* heightmap, double* ymin, double* ymax);
+double heightmapGetRawValue(HeightMap* heightmap, double x, double z);
+double heightmapGetValue(HeightMap* heightmap, double x, double z);
 
 void heightmapChangeResolution(HeightMap* heightmap, int resolution_x, int resolution_z);
-double heightmapGetValue(HeightMap* heightmap, double x, double z);
+void heightmapImportFromPicture(HeightMap* heightmap, const char* picturepath);
 
 void heightmapBrushElevation(HeightMap* heightmap, HeightMapBrush* brush, double value);
     
diff --git a/lib_paysages/terraincanvas.c b/lib_paysages/terraincanvas.c
index 5930841..2b7611a 100644
--- a/lib_paysages/terraincanvas.c
+++ b/lib_paysages/terraincanvas.c
@@ -128,7 +128,8 @@ Vector3 terrainCanvasApply(TerrainCanvas* canvas, Vector3 location)
         /* Apply factor */
         height = height * canvas->height_factor + canvas->offset_y;
         
-        /* TODO Apply detail noise */
+        /* Apply detail noise */
+        height += noiseGet2DTotal(canvas->detail_noise, location.x / canvas->detail_scaling, location.z / canvas->detail_scaling) * canvas->detail_height_factor;
         
         /* Apply integration mask */
         inside_x = (inside_x - 0.5) * 2.0;
@@ -147,7 +148,7 @@ Vector3 terrainCanvasApply(TerrainCanvas* canvas, Vector3 location)
         {
             location.y = height;
         }
-        else
+        else if (distance <= 1.0)
         {
             double influence = (1.0 - distance) / canvas->mask.smoothing;
             location.y = influence * height + (1.0 - influence) * location.y;