diff --git a/src/basics/Vector3.cpp b/src/basics/Vector3.cpp
index 41e84ee..de11720 100644
--- a/src/basics/Vector3.cpp
+++ b/src/basics/Vector3.cpp
@@ -117,7 +117,7 @@ Vector3 Vector3::midPointTo(const Vector3 &other) const {
 Vector3 Vector3::randomInSphere(double radius, bool only_surface, RandomGenerator &random) {
     // TODO More uniform spatial repartition
     //  The current randomization clusters result near the center and at the poles
-    VectorSpherical vec = {only_surface ? radius : random.genDouble() * radius,
-                           (random.genDouble() - 0.5) * M_PI, random.genDouble() * M_2PI};
+    VectorSpherical vec = {only_surface ? radius : random.genDouble() * radius, (random.genDouble() - 0.5) * M_PI,
+                           random.genDouble() * M_2PI};
     return Vector3(vec);
 }
diff --git a/src/basics/Vector3.h b/src/basics/Vector3.h
index c04b9d0..0776581 100644
--- a/src/basics/Vector3.h
+++ b/src/basics/Vector3.h
@@ -71,7 +71,8 @@ class BASICSSHARED_EXPORT Vector3 {
      *
      * If *only_surface* is true, produce a vector with *radius* as length.
      */
-    static Vector3 randomInSphere(double radius = 1.0, bool only_surface = false, RandomGenerator &random = RandomGeneratorDefault);
+    static Vector3 randomInSphere(double radius = 1.0, bool only_surface = false,
+                                  RandomGenerator &random = RandomGeneratorDefault);
 
   public:
     // TODO Make private
diff --git a/src/definition/AtmosphereDefinition.cpp b/src/definition/AtmosphereDefinition.cpp
index 9d4e691..8cbf3cc 100644
--- a/src/definition/AtmosphereDefinition.cpp
+++ b/src/definition/AtmosphereDefinition.cpp
@@ -153,9 +153,8 @@ void AtmosphereDefinition::generateStars(int count, RandomGenerator &random) {
     for (int i = 0; i < count; ++i) {
         Star star;
 
-        star.location =
-            Vector3((random.genDouble() - 0.5) * 100000.0, (random.genDouble() * 0.5) * 100000.0,
-                    (random.genDouble() - 0.5) * 100000.0);
+        star.location = Vector3((random.genDouble() - 0.5) * 100000.0, (random.genDouble() * 0.5) * 100000.0,
+                                (random.genDouble() - 0.5) * 100000.0);
         if (star.location.getNorm() < 30000.0) {
             i--;
             continue;
diff --git a/src/definition/Scenery.cpp b/src/definition/Scenery.cpp
index 4bb4bc2..77ee158 100644
--- a/src/definition/Scenery.cpp
+++ b/src/definition/Scenery.cpp
@@ -108,8 +108,7 @@ void Scenery::autoPreset(RandomGenerator &random) {
     Logs::debug() << "[Definition] New scenery generated from seed " << random.getSeed() << std::endl;
 }
 
-void Scenery::autoPreset(unsigned int seed)
-{
+void Scenery::autoPreset(unsigned int seed) {
     RandomGenerator random(seed);
     autoPreset(random);
 }
diff --git a/src/interface/modeler/quickapp/MainModelerWindow.cpp b/src/interface/modeler/quickapp/MainModelerWindow.cpp
index f8559b1..c1e1965 100644
--- a/src/interface/modeler/quickapp/MainModelerWindow.cpp
+++ b/src/interface/modeler/quickapp/MainModelerWindow.cpp
@@ -42,23 +42,11 @@ MainModelerWindow::MainModelerWindow() {
 
     render_process = new RenderProcess(this, render_preview_provider);
 
-    // Bind file buttons
-    QObject *button_new = findQmlObject("tool_file_new");
-    if (button_new) {
-        connect(button_new, SIGNAL(clicked()), this, SLOT(newFile()));
-    }
-    QObject *button_save = findQmlObject("tool_file_save");
-    if (button_save) {
-        connect(button_save, SIGNAL(clicked()), this, SLOT(saveFile()));
-    }
-    QObject *button_load = findQmlObject("tool_file_load");
-    if (button_load) {
-        connect(button_load, SIGNAL(clicked()), this, SLOT(loadFile()));
-    }
-    QObject *button_exit = findQmlObject("tool_file_exit");
-    if (button_exit) {
-        connect(button_exit, SIGNAL(clicked()), this, SLOT(exit()));
-    }
+    connectQmlSignal("tool_file_new", SIGNAL(clicked()), this, SLOT(newFile()));
+    connectQmlSignal("tool_file_save", SIGNAL(clicked()), this, SLOT(saveFile()));
+    connectQmlSignal("tool_file_load", SIGNAL(clicked()), this, SLOT(loadFile()));
+    connectQmlSignal("tool_file_exit", SIGNAL(clicked()), this, SLOT(exit()));
+    connectQmlSignal("root", SIGNAL(stopped()), this, SLOT(effectiveExit()));
 }
 
 MainModelerWindow::~MainModelerWindow() {
@@ -126,7 +114,7 @@ void MainModelerWindow::loadFile() {
 }
 
 void MainModelerWindow::exit() {
-    close();
+    renderer->stop();
 }
 
 void MainModelerWindow::keyReleaseEvent(QKeyEvent *event) {
@@ -178,3 +166,7 @@ void MainModelerWindow::keyReleaseEvent(QKeyEvent *event) {
         }
     }
 }
+
+void MainModelerWindow::effectiveExit() {
+    close();
+}
diff --git a/src/interface/modeler/quickapp/MainModelerWindow.h b/src/interface/modeler/quickapp/MainModelerWindow.h
index 73297ce..8850865 100644
--- a/src/interface/modeler/quickapp/MainModelerWindow.h
+++ b/src/interface/modeler/quickapp/MainModelerWindow.h
@@ -40,6 +40,9 @@ class MainModelerWindow : public QQuickView {
   protected:
     virtual void keyReleaseEvent(QKeyEvent *event) override;
 
+  protected slots:
+    void effectiveExit();
+
   private:
     Scenery *scenery;
     OpenGLRenderer *renderer;
diff --git a/src/interface/modeler/quickapp/OpenGLView.cpp b/src/interface/modeler/quickapp/OpenGLView.cpp
index 3380d4a..89d6c3d 100644
--- a/src/interface/modeler/quickapp/OpenGLView.cpp
+++ b/src/interface/modeler/quickapp/OpenGLView.cpp
@@ -41,6 +41,11 @@ void OpenGLView::paint() {
         return;
     }
 
+    if (renderer->isStopped()) {
+        emit stopped();
+        return;
+    }
+
     if (not initialized or not renderer) {
         renderer->initialize();
         initialized = true;
diff --git a/src/interface/modeler/quickapp/OpenGLView.h b/src/interface/modeler/quickapp/OpenGLView.h
index d62fd14..605b030 100644
--- a/src/interface/modeler/quickapp/OpenGLView.h
+++ b/src/interface/modeler/quickapp/OpenGLView.h
@@ -19,6 +19,9 @@ class OpenGLView : public QQuickItem {
     void handleResize();
     void handleSceneGraphReady();
 
+signals:
+    void stopped();
+
   protected:
     virtual void wheelEvent(QWheelEvent *event) override;
     virtual void mousePressEvent(QMouseEvent *event) override;
diff --git a/src/render/opengl/OpenGLPart.cpp b/src/render/opengl/OpenGLPart.cpp
index a0bc65e..997e132 100644
--- a/src/render/opengl/OpenGLPart.cpp
+++ b/src/render/opengl/OpenGLPart.cpp
@@ -1,5 +1,6 @@
 #include "OpenGLPart.h"
 
+#include "OpenGLRenderer.h"
 #include "OpenGLShaderProgram.h"
 #include "OpenGLVertexArray.h"
 
@@ -7,14 +8,25 @@ OpenGLPart::OpenGLPart(OpenGLRenderer *renderer) : renderer(renderer) {
 }
 
 OpenGLPart::~OpenGLPart() {
-    for (auto &pair: shaders) {
+    for (auto pair : shaders) {
         delete pair.second;
     }
-    for (auto &array: arrays) {
+    for (auto array : arrays) {
         delete array;
     }
 }
 
+void OpenGLPart::destroy() {
+    OpenGLFunctions *functions = getFunctions();
+
+    for (auto shader : shaders) {
+        shader.second->destroy(functions);
+    }
+    for (auto array : arrays) {
+        array->destroy(functions);
+    }
+}
+
 void OpenGLPart::interrupt() {
 }
 
@@ -29,13 +41,16 @@ OpenGLShaderProgram *OpenGLPart::createShader(const std::string &name) {
     }
 }
 
-OpenGLVertexArray *OpenGLPart::createVertexArray(bool has_uv, bool strip)
-{
+OpenGLVertexArray *OpenGLPart::createVertexArray(bool has_uv, bool strip) {
     OpenGLVertexArray *result = new OpenGLVertexArray(has_uv, strip);
     arrays.push_back(result);
     return result;
 }
 
+OpenGLFunctions *OpenGLPart::getFunctions() {
+    return renderer->getOpenGlFunctions();
+}
+
 void OpenGLPart::updateScenery(bool onlyCommon) {
     // Let subclass do its own collecting
     if (not onlyCommon) {
diff --git a/src/render/opengl/OpenGLPart.h b/src/render/opengl/OpenGLPart.h
index bea0e1a..b37a89d 100644
--- a/src/render/opengl/OpenGLPart.h
+++ b/src/render/opengl/OpenGLPart.h
@@ -26,6 +26,9 @@ class OPENGLSHARED_EXPORT OpenGLPart {
     // Do the rendering
     virtual void render() = 0;
 
+    // Free opengl resources generated in context (like textures...)
+    virtual void destroy();
+
     // Interrupt the rendering
     virtual void interrupt();
 
@@ -46,6 +49,8 @@ class OPENGLSHARED_EXPORT OpenGLPart {
      */
     OpenGLVertexArray *createVertexArray(bool has_uv, bool strip);
 
+    OpenGLFunctions *getFunctions();
+
     // Access to the main scenery renderer
     OpenGLRenderer *renderer;
 
diff --git a/src/render/opengl/OpenGLRenderer.cpp b/src/render/opengl/OpenGLRenderer.cpp
index 61ed6ed..20549bb 100644
--- a/src/render/opengl/OpenGLRenderer.cpp
+++ b/src/render/opengl/OpenGLRenderer.cpp
@@ -18,6 +18,8 @@ OpenGLRenderer::OpenGLRenderer(Scenery *scenery) : SoftwareRenderer(scenery) {
     ready = false;
     paused = false;
     displayed = false;
+    stopping = false;
+    stopped = false;
     vp_width = 1;
     vp_height = 1;
 
@@ -65,6 +67,16 @@ void OpenGLRenderer::checkForErrors(const std::string &domain) {
     }
 }
 
+void OpenGLRenderer::destroy() {
+    shared_state->destroy(functions);
+
+    skybox->destroy();
+    terrain->destroy();
+    water->destroy();
+
+    checkForErrors("stopping");
+}
+
 void OpenGLRenderer::initialize() {
     ready = functions->initializeOpenGLFunctions();
 
@@ -145,7 +157,12 @@ void OpenGLRenderer::resize(int width, int height) {
 }
 
 void OpenGLRenderer::paint(bool clear) {
-    if (ready and not paused) {
+    if (stopping) {
+        if (not stopped) {
+            destroy();
+            stopped = true;
+        }
+    } else if (ready and not paused) {
         checkForErrors("before_paint");
         if (clear) {
             functions->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
@@ -169,6 +186,11 @@ void OpenGLRenderer::paint(bool clear) {
     }
 }
 
+bool OpenGLRenderer::stop() {
+    stopping = true;
+    return stopped;
+}
+
 void OpenGLRenderer::reset() {
     if (ready) {
         skybox->updateScenery();
diff --git a/src/render/opengl/OpenGLRenderer.h b/src/render/opengl/OpenGLRenderer.h
index c7ede8b..1fac9bc 100644
--- a/src/render/opengl/OpenGLRenderer.h
+++ b/src/render/opengl/OpenGLRenderer.h
@@ -10,8 +10,8 @@ class QMatrix4x4;
 namespace paysages {
 namespace opengl {
 
-/*!
- * \brief Scenery renderer in an OpenGL context.
+/**
+ * Scenery renderer in an OpenGL context.
  */
 class OPENGLSHARED_EXPORT OpenGLRenderer : public SoftwareRenderer {
   public:
@@ -30,6 +30,12 @@ class OPENGLSHARED_EXPORT OpenGLRenderer : public SoftwareRenderer {
     inline bool isDisplayed() const {
         return displayed;
     }
+    inline bool isStopping() const {
+        return stopping;
+    }
+    inline bool isStopped() const {
+        return stopped;
+    }
 
     /**
      * Check for errors in OpenGL context.
@@ -38,10 +44,26 @@ class OPENGLSHARED_EXPORT OpenGLRenderer : public SoftwareRenderer {
      */
     void checkForErrors(const std::string &domain);
 
+    /**
+     * Release any allocated resource in the opengl context.
+     *
+     * Must be called in the opengl rendering thread, and before the destructor is called.
+     */
+    void destroy();
+
     void initialize();
-    void prepareOpenGLState(bool clear=true);
+    void prepareOpenGLState(bool clear = true);
     void resize(int width, int height);
-    void paint(bool clear=true);
+    void paint(bool clear = true);
+
+    /**
+     * Ask for the rendering to stop gracefully.
+     *
+     * Returns true if the rendering is stopped and resources freed.
+     *
+     * This should be called in an idle loop, while it returns false.
+     */
+    bool stop();
 
     /**
      * Reset the whole state (when the scenery has been massively updated).
@@ -95,6 +117,8 @@ class OPENGLSHARED_EXPORT OpenGLRenderer : public SoftwareRenderer {
     bool ready;
     bool paused;
     bool displayed;
+    bool stopping;
+    bool stopped;
     int vp_width;
     int vp_height;
 
diff --git a/src/render/opengl/OpenGLShaderProgram.cpp b/src/render/opengl/OpenGLShaderProgram.cpp
index 39c7351..da06458 100644
--- a/src/render/opengl/OpenGLShaderProgram.cpp
+++ b/src/render/opengl/OpenGLShaderProgram.cpp
@@ -41,6 +41,10 @@ void OpenGLShaderProgram::addFragmentSource(const std::string &path) {
     }
 }
 
+void OpenGLShaderProgram::destroy(OpenGLFunctions *functions) {
+    program->removeAllShaders();
+}
+
 void OpenGLShaderProgram::compile() {
     std::string prefix = std::string("#version ") + OPENGL_GLSL_VERSION + "\n\n";
 
diff --git a/src/render/opengl/OpenGLShaderProgram.h b/src/render/opengl/OpenGLShaderProgram.h
index 3eedf94..af3d93b 100644
--- a/src/render/opengl/OpenGLShaderProgram.h
+++ b/src/render/opengl/OpenGLShaderProgram.h
@@ -16,6 +16,13 @@ class OPENGLSHARED_EXPORT OpenGLShaderProgram {
     void addVertexSource(const std::string &path);
     void addFragmentSource(const std::string &path);
 
+    /**
+     * Release any allocated resource in the opengl context.
+     *
+     * Must be called in the opengl rendering thread, and before the destructor is called.
+     */
+    void destroy(OpenGLFunctions *functions);
+
     /**
      * Draw a VertexArray object.
      *
diff --git a/src/render/opengl/OpenGLSharedState.cpp b/src/render/opengl/OpenGLSharedState.cpp
index 7cd27e9..ad6eacb 100644
--- a/src/render/opengl/OpenGLSharedState.cpp
+++ b/src/render/opengl/OpenGLSharedState.cpp
@@ -15,6 +15,12 @@ void OpenGLSharedState::apply(OpenGLShaderProgram *program, int &texture_unit) {
     }
 }
 
+void OpenGLSharedState::destroy(OpenGLFunctions *functions) {
+    for (const auto &pair : variables) {
+        pair.second->destroy(functions);
+    }
+}
+
 OpenGLVariable *OpenGLSharedState::get(const std::string &name) {
     OpenGLVariable *&var = variables[name];
     if (var == NULL) {
diff --git a/src/render/opengl/OpenGLSharedState.h b/src/render/opengl/OpenGLSharedState.h
index 15bdf48..8185e6d 100644
--- a/src/render/opengl/OpenGLSharedState.h
+++ b/src/render/opengl/OpenGLSharedState.h
@@ -11,21 +11,28 @@ class QImage;
 namespace paysages {
 namespace opengl {
 
-/*!
- * \brief OpenGL variables that can be shared between shaders.
+/**
+ * OpenGL variables that can be shared between shaders.
  */
 class OPENGLSHARED_EXPORT OpenGLSharedState {
   public:
     OpenGLSharedState();
     ~OpenGLSharedState();
 
-    /*!
-     * \brief Apply the stored variables to the bound program.
+    /**
+     * Apply the stored variables to the bound program.
      */
     void apply(OpenGLShaderProgram *program, int &texture_unit);
 
-    /*!
-     * \brief Get or create a variable in the state.
+    /**
+     * Release any allocated resource in the opengl context.
+     *
+     * Must be called in the opengl rendering thread, and before the destructor is called.
+     */
+    void destroy(OpenGLFunctions *functions);
+
+    /**
+     * Get or create a variable in the state.
      */
     OpenGLVariable *get(const std::string &name);
 
diff --git a/src/render/opengl/OpenGLTerrain.cpp b/src/render/opengl/OpenGLTerrain.cpp
index 18c67a4..491a7ec 100644
--- a/src/render/opengl/OpenGLTerrain.cpp
+++ b/src/render/opengl/OpenGLTerrain.cpp
@@ -62,7 +62,7 @@ void OpenGLTerrain::initialize() {
     for (int i = 0; i < chunks; i++) {
         for (int j = 0; j < chunks; j++) {
             OpenGLTerrainChunk *chunk = new OpenGLTerrainChunk(renderer, start + chunksize * (double)i,
-                                                                   start + chunksize * (double)j, chunksize, chunks);
+                                                               start + chunksize * (double)j, chunksize, chunks);
             _chunks.append(chunk);
             _updateQueue.append(chunk);
         }
@@ -94,6 +94,13 @@ void OpenGLTerrain::interrupt() {
     }
 }
 
+void OpenGLTerrain::destroy() {
+    OpenGLFunctions *functions = getFunctions();
+    for (auto &chunk : _chunks) {
+        chunk->destroy(functions);
+    }
+}
+
 void OpenGLTerrain::pause() {
     paused = true;
     interrupt();
diff --git a/src/render/opengl/OpenGLTerrain.h b/src/render/opengl/OpenGLTerrain.h
index 2d24677..5aebb5e 100644
--- a/src/render/opengl/OpenGLTerrain.h
+++ b/src/render/opengl/OpenGLTerrain.h
@@ -22,6 +22,7 @@ class OPENGLSHARED_EXPORT OpenGLTerrain : public OpenGLPart, public DefinitionWa
     virtual void update() override;
     virtual void render() override;
     virtual void interrupt() override;
+    virtual void destroy() override;
 
     void pause();
     void resume();
diff --git a/src/render/opengl/OpenGLTerrainChunk.cpp b/src/render/opengl/OpenGLTerrainChunk.cpp
index ac07a5e..ee6d4f5 100644
--- a/src/render/opengl/OpenGLTerrainChunk.cpp
+++ b/src/render/opengl/OpenGLTerrainChunk.cpp
@@ -146,14 +146,14 @@ void OpenGLTerrainChunk::updatePriority(CameraDefinition *camera) {
     _lock_data->release();
 
     // Update wanted LOD
-    if (distance_to_camera < 60.0) {
+    if (distance_to_camera < 100.0) {
         _texture_wanted_size = _texture_max_size;
-    } else if (distance_to_camera < 140.0) {
+    } else if (distance_to_camera < 200.0) {
         _texture_wanted_size = _texture_max_size / 4;
-    } else if (distance_to_camera < 300.0) {
+    } else if (distance_to_camera < 400.0) {
         _texture_wanted_size = _texture_max_size / 8;
     } else {
-        _texture_wanted_size = 8;
+        _texture_wanted_size = _texture_max_size / 16;
     }
 
     // Update priority
@@ -195,6 +195,11 @@ void OpenGLTerrainChunk::askResume() {
     interrupt = false;
 }
 
+void OpenGLTerrainChunk::destroy(OpenGLFunctions *functions) {
+    vertices->destroy(functions);
+    glstate->destroy(functions);
+}
+
 void OpenGLTerrainChunk::setFirstStepVertices() {
     OpenGLVertexArray next(true);
     next.setVertexCount(6);
@@ -210,6 +215,9 @@ void OpenGLTerrainChunk::augmentVertices() {
     // TODO Re-use existing vertices from previous level when possible
     double quad_size = _size / (double)next_vertices_level;
     for (int iz = 0; iz < next_vertices_level; iz++) {
+        if (interrupt or _reset_topology) {
+            return;
+        }
         for (int ix = 0; ix < next_vertices_level; ix++) {
             fillVerticesFromSquare(&next, (iz * next_vertices_level + ix) * 6, _startx + quad_size * (double)ix,
                                    _startz + quad_size * (double)iz, quad_size);
diff --git a/src/render/opengl/OpenGLTerrainChunk.h b/src/render/opengl/OpenGLTerrainChunk.h
index 4eeff97..159c329 100644
--- a/src/render/opengl/OpenGLTerrainChunk.h
+++ b/src/render/opengl/OpenGLTerrainChunk.h
@@ -28,6 +28,13 @@ class OPENGLSHARED_EXPORT OpenGLTerrainChunk {
         return vertices;
     }
 
+    /**
+     * Release any allocated resource in the opengl context.
+     *
+     * Must be called in the opengl rendering thread, and before the destructor is called.
+     */
+    void destroy(OpenGLFunctions *functions);
+
     /**
      * Fill *vertices* with a quick initial set of vertices, that can be augmented later using *augmentVertices*.
      */
diff --git a/src/render/opengl/OpenGLVariable.cpp b/src/render/opengl/OpenGLVariable.cpp
index 31bad2e..b45402d 100644
--- a/src/render/opengl/OpenGLVariable.cpp
+++ b/src/render/opengl/OpenGLVariable.cpp
@@ -79,6 +79,13 @@ void OpenGLVariable::apply(OpenGLShaderProgram *program, int &texture_unit) {
     }
 }
 
+void OpenGLVariable::destroy(OpenGLFunctions *functions) {
+    if (texture_id) {
+        functions->glDeleteTextures(1, &texture_id);
+        texture_id = 0;
+    }
+}
+
 void OpenGLVariable::set(const Texture2D *texture, bool repeat, bool color) {
     assert(type == TYPE_NONE or type == TYPE_TEXTURE_2D);
 
@@ -111,8 +118,7 @@ void OpenGLVariable::set(const Texture2D *texture, bool repeat, bool color) {
     texture_color = color;
 }
 
-void OpenGLVariable::set(const QImage &texture, bool repeat, bool color)
-{
+void OpenGLVariable::set(const QImage &texture, bool repeat, bool color) {
     assert(type == TYPE_NONE or type == TYPE_TEXTURE_2D);
 
     type = TYPE_TEXTURE_2D;
@@ -272,8 +278,10 @@ void OpenGLVariable::uploadTexture(OpenGLRenderer *renderer) {
     int dest_format = texture_color ? GL_RGBA : GL_RED;
 
     if (type == TYPE_TEXTURE_2D) {
-        functions->glTexImage2D(GL_TEXTURE_2D, 0, dest_format, texture_size_x, texture_size_y, 0, GL_RGBA, GL_FLOAT, value_texture_data);
+        functions->glTexImage2D(GL_TEXTURE_2D, 0, dest_format, texture_size_x, texture_size_y, 0, GL_RGBA, GL_FLOAT,
+                                value_texture_data);
     } else {
-        functions->glTexImage3D(GL_TEXTURE_3D, 0, dest_format, texture_size_x, texture_size_y, texture_size_z, 0, GL_RGBA, GL_FLOAT, value_texture_data);
+        functions->glTexImage3D(GL_TEXTURE_3D, 0, dest_format, texture_size_x, texture_size_y, texture_size_z, 0,
+                                GL_RGBA, GL_FLOAT, value_texture_data);
     }
 }
diff --git a/src/render/opengl/OpenGLVariable.h b/src/render/opengl/OpenGLVariable.h
index 6d977a9..d2d5aa6 100644
--- a/src/render/opengl/OpenGLVariable.h
+++ b/src/render/opengl/OpenGLVariable.h
@@ -33,6 +33,13 @@ class OpenGLVariable {
 
     void apply(OpenGLShaderProgram *program, int &texture_unit);
 
+    /**
+     * Release any allocated resource in the opengl context.
+     *
+     * Must be called in the opengl rendering thread, and before the destructor is called.
+     */
+    void destroy(OpenGLFunctions *functions);
+
     void set(const Texture2D *texture, bool repeat = false, bool color = true);
     void set(const QImage &texture, bool repeat = false, bool color = true);
     void set(const Texture3D *texture, bool repeat = false, bool color = true);
diff --git a/src/render/opengl/OpenGLVertexArray.cpp b/src/render/opengl/OpenGLVertexArray.cpp
index 8d6ad34..185b786 100644
--- a/src/render/opengl/OpenGLVertexArray.cpp
+++ b/src/render/opengl/OpenGLVertexArray.cpp
@@ -30,8 +30,19 @@ OpenGLVertexArray::~OpenGLVertexArray() {
     free(array_uv);
 }
 
-void OpenGLVertexArray::destroy() {
-    // TODO
+void OpenGLVertexArray::destroy(OpenGLFunctions *functions) {
+    if (vbo_vertex) {
+        functions->glDeleteBuffers(1, &vbo_vertex);
+        vbo_vertex = 0;
+    }
+    if (vbo_uv) {
+        functions->glDeleteBuffers(1, &vbo_uv);
+        vbo_uv = 0;
+    }
+    if (vao) {
+        functions->glDeleteVertexArrays(1, &vao);
+        vao = 0;
+    }
 }
 
 void OpenGLVertexArray::render(OpenGLFunctions *functions) {
@@ -72,8 +83,7 @@ void OpenGLVertexArray::set(int index, const Vector3 &location, double u, double
     }
 }
 
-void OpenGLVertexArray::get(int index, Vector3 *location, double *u, double *v) const
-{
+void OpenGLVertexArray::get(int index, Vector3 *location, double *u, double *v) const {
     if (index >= 0 and index < vertexcount) {
         location->x = array_vertex[index * 3];
         location->y = array_vertex[index * 3 + 1];
@@ -85,8 +95,7 @@ void OpenGLVertexArray::get(int index, Vector3 *location, double *u, double *v)
     }
 }
 
-void OpenGLVertexArray::copyTo(OpenGLVertexArray *destination) const
-{
+void OpenGLVertexArray::copyTo(OpenGLVertexArray *destination) const {
     destination->setVertexCount(vertexcount);
     if (vertexcount) {
         memcpy(destination->array_vertex, array_vertex, sizeof(float) * vertexcount * 3);
diff --git a/src/render/opengl/OpenGLVertexArray.h b/src/render/opengl/OpenGLVertexArray.h
index fe9ea9b..142825b 100644
--- a/src/render/opengl/OpenGLVertexArray.h
+++ b/src/render/opengl/OpenGLVertexArray.h
@@ -25,7 +25,7 @@ class OpenGLVertexArray {
      *
      * Must be called in the opengl rendering thread, and before the destructor is called.
      */
-    void destroy();
+    void destroy(OpenGLFunctions *functions);
 
     /**
      * Render this array in current opengl context.
diff --git a/src/system/RandomGenerator.cpp b/src/system/RandomGenerator.cpp
index dcaf023..78703c8 100644
--- a/src/system/RandomGenerator.cpp
+++ b/src/system/RandomGenerator.cpp
@@ -4,11 +4,11 @@
 #include <random>
 
 static RandomGenerator _RandomGeneratorDefault;
-RandomGenerator& paysages::system::RandomGeneratorDefault = _RandomGeneratorDefault;
+RandomGenerator &paysages::system::RandomGeneratorDefault = _RandomGeneratorDefault;
 
 class RandomGenerator::RandomGeneratorPrivate {
   public:
-    RandomGeneratorPrivate(unsigned int seed): generator(seed) {
+    RandomGeneratorPrivate(unsigned int seed) : generator(seed) {
     }
 
     std::default_random_engine generator;
@@ -27,12 +27,10 @@ RandomGenerator::RandomGenerator(RandomGenerator::Seed seed) {
     data = new RandomGeneratorPrivate(seed);
 }
 
-RandomGenerator::~RandomGenerator()
-{
+RandomGenerator::~RandomGenerator() {
     delete data;
 }
 
-double RandomGenerator::genDouble()
-{
+double RandomGenerator::genDouble() {
     return data->distribution_double(data->generator);
 }
diff --git a/src/system/system_global.h b/src/system/system_global.h
index 154f1ab..0ff1270 100644
--- a/src/system/system_global.h
+++ b/src/system/system_global.h
@@ -31,7 +31,7 @@ class PictureWriter;
 class Time;
 class RandomGenerator;
 
-extern RandomGenerator& RandomGeneratorDefault;
+extern RandomGenerator &RandomGeneratorDefault;
 }
 }
 using namespace paysages::system;
diff --git a/src/tests/OpenGLTerrainChunk_Test.cpp b/src/tests/OpenGLTerrainChunk_Test.cpp
index 81f12dc..a294dfe 100644
--- a/src/tests/OpenGLTerrainChunk_Test.cpp
+++ b/src/tests/OpenGLTerrainChunk_Test.cpp
@@ -6,7 +6,8 @@
 #include "OpenGLVertexArray.h"
 #include "Vector3.h"
 
-static void checkVertex(const OpenGLVertexArray *array, int index, const Vector3 &expected_location, double expected_u, double expected_v) {
+static void checkVertex(const OpenGLVertexArray *array, int index, const Vector3 &expected_location, double expected_u,
+                        double expected_v) {
     Vector3 location;
     double u, v;