diff --git a/shaders/forward.frag.glsl b/shaders/forward.frag.glsl
index 1cd6dfe..ce955a9 100644
--- a/shaders/forward.frag.glsl
+++ b/shaders/forward.frag.glsl
@@ -42,8 +42,15 @@ in vec4 posInLightSpace;
 
 in vec2 varTexCoord;
 
+#ifndef AMBIENT_LIGHT
 in vec3 lightDirInView;
 in vec3 halfVecInView;
+#endif
+
+#ifdef POINT_LIGHT
+in vec3 lightDistInView;
+uniform float attenuation;
+#endif
 
 layout(location = 0)out vec4 outColor;
 
@@ -95,10 +102,17 @@ void main(void) {
     float shadow = 1;
 #endif
 
+    float att = 0;
+#ifdef POINT_LIGHT
+    att = length(lightDistInView)*attenuation;
+    if(att > 1)
+        discard;
+#endif
+
 #ifdef AMBIENT_LIGHT
-    outColor = vec4(0, 0, 0, 1);
+    outColor = vec4(diffuse*0.1f, 1);
 #else
     vec3 light = phongLighting(diffuse, specular, materialNs, lightColor, normal, lightDirInView, halfVecInView);
-    outColor = vec4(shadow*light, 1);
+    outColor = vec4(light*shadow*(1+cos(1.57 + att*1.57)), 1);
 #endif
 }
diff --git a/shaders/forward.vert.glsl b/shaders/forward.vert.glsl
index e4459ef..a75f137 100644
--- a/shaders/forward.vert.glsl
+++ b/shaders/forward.vert.glsl
@@ -34,6 +34,10 @@ out vec3 lightDirInView;
 out vec3 halfVecInView;
 #endif
 
+#ifdef POINT_LIGHT
+out vec3 lightDistInView;
+#endif
+
 #ifdef SHADOWMAP
 uniform mat4 lightMVP;
 out vec4 posInLightSpace;
@@ -52,8 +56,9 @@ void main(void) {
 #endif
 
 #ifdef POINT_LIGHT
-    vec4 lightPosInView = viewMatrix*vec4(pointLight, 1);
-    lightDirInView = normalize(lightPosInView.xyz - posInView);
+    vec3 lightPosInView = vec3(viewMatrix*vec4(pointLight, 1));
+    lightDistInView = lightPosInView - posInView;
+    lightDirInView = normalize(lightDistInView);
     halfVecInView = normalize(lightDirInView - normalize(posInView));
 #endif
 
diff --git a/shaders/hdr.frag.glsl b/shaders/hdr.frag.glsl
index ebf27ac..866232b 100644
--- a/shaders/hdr.frag.glsl
+++ b/shaders/hdr.frag.glsl
@@ -2,7 +2,7 @@
 
 uniform sampler2DRect colorSampler;
 
-uniform float exposition;
+uniform vec3 minMaxMean;
 uniform float gamma;
 
 layout(location = 0)out vec4 outColor;
@@ -11,8 +11,9 @@ void main(void) {
     ivec2 pos = ivec2(gl_FragCoord.xy);
     vec3 color = texelFetch(colorSampler, pos).xyz;
 
+    vec3 mapped = (color-minMaxMean.r)/(minMaxMean.g-minMaxMean.r);
     // Exposure tone mapping
-    vec3 mapped = vec3(1.0) - exp(-color * 1);
+    //vec3 mapped = vec3(1.0) - exp(-color * exposition);
 
     // Gamma correction
     mapped = pow(mapped, vec3(1.0 / gamma));
diff --git a/src/forwardmodule.cpp b/src/forwardmodule.cpp
index c128339..65c9323 100644
--- a/src/forwardmodule.cpp
+++ b/src/forwardmodule.cpp
@@ -43,6 +43,11 @@ void ForwardModule::renderGL(Camera* myCamera, Scene* scene)
 
 void ForwardModule::lightPass(Camera* myCamera, Scene* scene, Light* light)
 {
+    if(isWireframe){
+        glAssert(glPolygonMode(GL_FRONT_AND_BACK, GL_LINE));
+    }else{
+        glAssert(glPolygonMode(GL_FRONT_AND_BACK, GL_FILL));
+    }
     // loop over all types of geometry
     for(int i=0; i<geometryFlagList.size(); ++i)
     {
@@ -75,7 +80,7 @@ void ForwardModule::lightPass(Camera* myCamera, Scene* scene, Light* light)
             case Light::POINT:
                 shader->bindVec3(shader->getLocation("pointLight"), light->getPos());
                 shader->bindVec3(shader->getLocation("lightColor"), light->getColor());
-                // TODO add attenuation
+                shader->bindFloat(shader->getLocation("attenuation"), light->getAttenuation());
                 break;
             case Light::SPOT:
                 shader->bindVec3(shader->getLocation("lightColor"), light->getColor());
diff --git a/src/forwardmodule.h b/src/forwardmodule.h
index 65a28f5..f027e86 100644
--- a/src/forwardmodule.h
+++ b/src/forwardmodule.h
@@ -18,7 +18,8 @@ class ForwardModule : public Module
 public:
     ForwardModule() :
         shaderSources(NULL),
-        renderTarget(FrameBuffer::screen)
+        renderTarget(FrameBuffer::screen),
+        isWireframe(false)
     {}
 
     virtual void renderGL(Camera* myCamera, Scene* scene);
@@ -30,6 +31,7 @@ public:
     void compileShaders(Scene* scene);
 
     void setRenderTarget(const FrameBuffer* target);
+    void setWireframe(bool wireframe) {isWireframe = wireframe;}
 
 private:
     static const char* const flagStr[NB_FLAGS];
@@ -40,6 +42,8 @@ private:
     std::vector<unsigned int> lightFlagList;
     const FrameBuffer* renderTarget;
 
+    bool isWireframe;
+
     void lightPass(Camera* myCamera, Scene* scene, Light* light);
 };
 
diff --git a/src/light.cpp b/src/light.cpp
index fcc19a5..32d51ec 100644
--- a/src/light.cpp
+++ b/src/light.cpp
@@ -39,7 +39,7 @@ void Light::initDirectionnalLight(glm::vec3 dir, glm::vec3 lightColor)
     viewMatrix = glm::lookAt(position, position+direction, glm::vec3(0, 1, 0));
 }
 
-void Light::initPointLight(glm::vec3 pos, glm::vec3 lightColor)
+void Light::initPointLight(glm::vec3 pos, glm::vec3 lightColor, float att)
 {
     type = POINT;
     position = pos;
@@ -48,6 +48,7 @@ void Light::initPointLight(glm::vec3 pos, glm::vec3 lightColor)
     shadowCaster = false;
     isDir = false;
     viewMatrix = glm::mat4();
+    attenuation = att;
 }
 
 void Light::initSpotLight(glm::vec3 pos, glm::vec3 dir, float spotAngle, glm::vec3 lightColor)
@@ -95,6 +96,7 @@ void Light::initShadowMap(int resWidth, int resHeight, glm::vec3 dim)
 
 void Light::generateShadowMap(Scene* scene)
 {
+    glAssert(glPolygonMode(GL_FRONT_AND_BACK, GL_FILL));
     glAssert(glViewport(0, 0, shadowMapWidth, shadowMapHeight));
     shadowMap->bindFBO();
     glAssert(glClearDepth(1.0));
diff --git a/src/light.h b/src/light.h
index 6157c38..bd34e3c 100644
--- a/src/light.h
+++ b/src/light.h
@@ -33,7 +33,7 @@ public:
 
     Light();
     void initDirectionnalLight(glm::vec3 dir = glm::vec3(1, 0, 0), glm::vec3 lightColor = glm::vec3(1));
-    void initPointLight(glm::vec3 pos = glm::vec3(0), glm::vec3 lightColor = glm::vec3(1));
+    void initPointLight(glm::vec3 pos = glm::vec3(0), glm::vec3 lightColor = glm::vec3(1), float att = 1);
     void initSpotLight(glm::vec3 pos = glm::vec3(0), glm::vec3 dir = glm::vec3(1, 0, 0), float spotAngle = 360, glm::vec3 lightColor = glm::vec3(1));
 
     bool isDirectionnal();
@@ -41,12 +41,15 @@ public:
     glm::vec3 getDir() {return direction;}
     glm::vec3 getPos() {return position;}
     glm::vec3 getColor() {return color;}
+    float getAttenuation() {return attenuation;}
 
     bool isShadowCaster() {return shadowCaster;}
     void initShadowMap(int resWidth, int resHeight, glm::vec3 dim = glm::vec3(1));
     void generateShadowMap(Scene* scene);
     Texture* getShadowMap();
 
+    void setAttenuation(float a) {attenuation = a;}
+
     // camera inheritance
     virtual glm::mat4 getProjectionMatrix() {return projectionMatrix;}
     virtual glm::mat4 getViewMatrix() {return viewMatrix;}
diff --git a/src/mesh.cpp b/src/mesh.cpp
index 63f06ee..e508d3e 100644
--- a/src/mesh.cpp
+++ b/src/mesh.cpp
@@ -191,45 +191,57 @@ Mesh* VertexComparator::mesh = NULL;
 
 void Mesh::mergeVertices()
 {
-    std::vector<int> swapped;
+    bool *deleted = new bool[positions.size()];
+    int *offsets = new int[positions.size()];
     std::set<int, VertexComparator> vertexSet;
     VertexComparator::setMesh(this);
 
-    int swappedOffset = positions.size() - 1;
-
     for(int i=0; i<indices.size(); ++i)
     {
-        if(indices[i] >= positions.size())
-            indices[i] = swapped[swappedOffset - indices[i]];
         std::pair<std::set<int,VertexComparator>::iterator,bool> ret = vertexSet.insert(indices[i]);
-        if(!ret.second) // duplicate found
+        deleted[indices[i]] = !ret.second && *(ret.first) != indices[i];
+        if(deleted[indices[i]])
         {
-            // updating indices references
-            int toDelete = indices[i];
-            swapped.push_back(toDelete);
-            indices[i] = *(ret.first);
-            // deleting the duplicate
-            positions[toDelete] = positions.back();
-            positions.pop_back();
-            if(hasTexCoords())
-            {
-                texCoords[toDelete] = texCoords.back();
-                texCoords.pop_back();
-            }
-            if(hasNormals())
-            {
-                normals[toDelete] = normals.back();
-                normals.pop_back();
-            }
             if(hasTangents())
             {
-                tangents[indices[i]].tangent += tangents[toDelete].tangent;
-                tangents[indices[i]].binormal += tangents[toDelete].binormal;
-                tangents[toDelete] = tangents.back();
-                tangents.pop_back();
+                tangents[*(ret.first)].tangent += tangents[indices[i]].tangent;
+                tangents[*(ret.first)].binormal += tangents[indices[i]].binormal;
             }
+            indices[i] = *(ret.first);
         }
     }
+    int offset = 0;
+    int pos = 0;
+    for(int i=0; i<positions.size(); ++i)
+    {
+        if(deleted[i])
+            ++offset;
+        else
+        {
+            offsets[i] = offset;
+            if(offset != 0)
+            {
+                positions[pos] = positions[i];
+                if(hasTexCoords())
+                    texCoords[pos] = texCoords[i];
+                if(hasNormals())
+                    normals[pos] = normals[i];
+                if(hasTangents())
+                    tangents[pos] = tangents[i];
+            }
+            ++pos;
+        }
+    }
+    for(int i=0; i<indices.size(); ++i)
+        indices[i] -= offsets[indices[i]];
+
+    positions.resize(positions.size()-offset);
+    if(hasTexCoords())
+        texCoords.resize(texCoords.size()-offset);
+    if(hasNormals())
+        normals.resize(normals.size()-offset);
+    if(hasTangents())
+        tangents.resize(tangents.size()-offset);
     for(Tangents &t : tangents)
     {
         t.tangent = glm::normalize(t.tangent);
diff --git a/src/posteffectmodule.cpp b/src/posteffectmodule.cpp
index 5a32671..b1b136e 100644
--- a/src/posteffectmodule.cpp
+++ b/src/posteffectmodule.cpp
@@ -114,6 +114,7 @@ void PostEffectModule::renderGL(Camera* myCamera, Scene* scene)
 {
     if(shaders[0] != NULL)
     {
+        glAssert(glPolygonMode(GL_FRONT_AND_BACK, GL_FILL));
         glAssert(glDisable(GL_BLEND));
         glAssert(glDisable(GL_DEPTH_TEST));
 
@@ -178,7 +179,6 @@ void PostEffectModule::bloomStep()
 void PostEffectModule::hdrStep()
 {
     glm::vec3 minMaxMean = redux->redux();
-    float exposition = 1/(2*minMaxMean.z);
     float gamma = 2.2f;
 
     glAssert(glViewport(0, 0, width, height));
@@ -189,7 +189,7 @@ void PostEffectModule::hdrStep()
 
     shaders[HDR_SHADER]->bindInteger(shaders[HDR_SHADER]->getLocation("colorSampler"), 0);
     frameBuffers[BLOOM_FBO].getTexture(1)->bind(0);
-    shaders[HDR_SHADER]->bindFloat(shaders[HDR_SHADER]->getLocation("exposition"), exposition);
+    shaders[HDR_SHADER]->bindVec3(shaders[HDR_SHADER]->getLocation("minMaxMean"), minMaxMean);
     shaders[HDR_SHADER]->bindFloat(shaders[HDR_SHADER]->getLocation("gamma"), gamma);
 
     glAssert(glDrawArrays(GL_TRIANGLES, 0, 3));
diff --git a/src/scene.h b/src/scene.h
index 124f389..90a12ac 100644
--- a/src/scene.h
+++ b/src/scene.h
@@ -59,6 +59,7 @@ public:
     void clearScene() {clearLights(); clearEntities();}
     void addMesh(GeometryNode* node) {geometry.push_back(node);}
     void addLight(Light* myLight) {lights.push_back(myLight);}
+    Mesh* getMesh(int id) {return geometry[id]->mesh;}
 
     virtual SceneIterator<Light*>* getLights() {return new ArraySceneIterator<Light*>(lights);}
     virtual SceneIterator<GeometryNode*>* getGeometry() {return new ArraySceneIterator<GeometryNode*>(geometry);}