diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1cb2f6b..2ce4739 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,4 +16,6 @@ endif()
 
 file(GLOB RESOURCES_FILES src/*.h shaders/*.glsl)
 
-include(../cmaketemplate/template.cmake)
+set(CMAKE_TEMPLATE_PATH "../cmaketemplate")
+
+include(${CMAKE_TEMPLATE_PATH}/template.cmake)
diff --git a/src/buffer.cpp b/src/buffer.cpp
index a3f03d0..d8b2758 100644
--- a/src/buffer.cpp
+++ b/src/buffer.cpp
@@ -4,7 +4,7 @@
 #include <cstdio>
 
 template <typename T>
-GLenum Buffer<T>::getGLEnum(BufferType type)
+GLenum TBuffer<T>::getGLEnum(BufferType type)
 {
    GLenum typeEnum;
     
@@ -25,7 +25,7 @@ GLenum Buffer<T>::getGLEnum(BufferType type)
 }
 
 template <typename T>
-Buffer<T>::BufferEditor::BufferEditor(Buffer *b)
+TBuffer<T>::BufferEditor::BufferEditor(TBuffer *b)
 {
     if(b->isDynamic())
     {
@@ -41,14 +41,14 @@ Buffer<T>::BufferEditor::BufferEditor(Buffer *b)
 }
 
 template <typename T>
-Buffer<T>::BufferEditor::~BufferEditor()
+TBuffer<T>::BufferEditor::~BufferEditor()
 {
     glUnmapBuffer(m_typeEnum);
     glBindBuffer(m_typeEnum, 0);
 }
 
 template <typename T>
-Buffer<T>::Buffer(const std::vector<T> &data, BufferType type, bool isDynamic) :
+TBuffer<T>::TBuffer(const std::vector<T> &data, BufferType type, bool isDynamic) :
    m_type(type),
    m_isDynamic(isDynamic)
 {
@@ -62,7 +62,7 @@ Buffer<T>::Buffer(const std::vector<T> &data, BufferType type, bool isDynamic) :
 }
 
 template <typename T>
-void Buffer<T>::setVertexAttrib(int location, int nbComponents, int offset, int instanceDivisor)
+void TBuffer<T>::setVertexAttrib(int location, int nbComponents, int offset, int instanceDivisor)
 {
     if(m_type == VBO && SparrowRenderer::isModernOpenGLAvailable())
     {
@@ -76,19 +76,19 @@ void Buffer<T>::setVertexAttrib(int location, int nbComponents, int offset, int
 }
 
 template <typename T>
-void Buffer<T>::bind()
+void TBuffer<T>::bind()
 {
     glBindBuffer(getGLEnum(m_type), m_id);
 }
 
 template <typename T>
-void Buffer<T>::unbind()
+void TBuffer<T>::unbind()
 {
     glBindBuffer(getGLEnum(m_type), 0);
 }
 
 template <typename T>
-Buffer<T>::~Buffer()
+TBuffer<T>::~TBuffer()
 {
     glDeleteBuffers(1, m_id);
 }
diff --git a/src/buffer.h b/src/buffer.h
index c75ffd6..8985f60 100644
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -6,9 +6,17 @@
 
 #define BUFFER_OFFSET(i) ((char *)NULL + (i))
 
-template <typename T>
 class Buffer
 {
+public:
+    virtual ~Buffer();
+    virtual void bind() = 0;
+    virtual void unbind() = 0;
+};
+
+template <typename T>
+class TBuffer : public Buffer
+{
 public:
    enum BufferType
    {
@@ -23,19 +31,19 @@ public:
          T *ptr;
          
       public:
-         BufferEditor(Buffer *b);
+         BufferEditor(TBuffer *b);
          ~BufferEditor();
          
          T* getPointer();
    };
    
-    Buffer(const std::vector<T> &data, BufferType type, bool isDynamic = false);
-    ~Buffer();
+    TBuffer(const std::vector<T> &data, BufferType type, bool isDynamic = false);
+    ~TBuffer();
     
-    void setVertexAttrib(int location, int nbComponents, int offset = 0, int instanceDivisor = 0);
+    virtual void setVertexAttrib(int location, int nbComponents, int offset = 0, int instanceDivisor = 0);
     
-    void bind();
-    void unbind();
+    virtual void bind();
+    virtual void unbind();
 
     GLuint getId() {return m_id;}
     BufferType getType() {return m_type;}
diff --git a/src/forwardmodule.cpp b/src/forwardmodule.cpp
index 160f709..2f41af0 100644
--- a/src/forwardmodule.cpp
+++ b/src/forwardmodule.cpp
@@ -3,7 +3,7 @@
 #include "mesh.h"
 #include "shader.h"
 #include "light.h"
-
+#include "phongmaterial.h"
 #include "texture.h"
 #include <glm/ext.hpp>
 
@@ -14,91 +14,60 @@ void ForwardModule::renderGL(Camera* myCamera, Scene* scene)
     if(clearBeforeDrawing)
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
     glViewport(0, 0, width, height);
-
-    // render ambient lighting
-    glEnable(GL_DEPTH_TEST);
-    glDepthFunc(GL_LESS);
-    glDisable(GL_BLEND);
-
-    lightPass(myCamera, scene, NULL);
-
-    // render directionnal lighting and point lighting
-    glDepthFunc(GL_LEQUAL);
-    glEnable(GL_BLEND);
-    glBlendFunc(GL_ONE, GL_ONE);
-    glDepthMask(GL_FALSE);
-
-    for(SceneIterator<Light*>* lightIt = scene->getLights(); lightIt->isValid(); lightIt->next())
-        lightPass(myCamera, scene, lightIt->getItem());
-
-    glDisable(GL_BLEND);
-    glDepthFunc(GL_LESS);
-    glDepthMask(GL_TRUE);
-}
-
-void ForwardModule::lightPass(Camera* myCamera, Scene* scene, Light* light)
-{
-    if(isWireframe){
-        glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
-    }else{
-        glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
-    }
-    // loop over all types of geometry
-    for(std::size_t i=0; i<geometryFlagList.size(); ++i)
+    
+    for(const Pass &p : passes)
     {
-        std::size_t j;
-        for(j=0; j<lightFlagList.size(); ++j)
-            if(lightFlagList[j] == light->getFlags())
-                break;
-        if(j == lightFlagList.size())
+        for(Light *light : p.lights)
         {
-            fprintf(stderr, "WARNING : missing shader for the light");
-            continue;
-        }
-        Shader* shader = shaders[i*lightFlagList.size() + j];
-        shader->bind();
-
-        // bind light attributes
-        switch(light->getType())
-        {
-        case Light::AMBIENT:
-            shader->bindVec3(shader->getLocation("lightColor"), light->getColor()); // add attribute, and setter for ambient lighting
-            break;
-        case Light::DIRECTIONNAL:
-            shader->bindVec3(shader->getLocation("dirLight"), -light->getDir());
-            shader->bindVec3(shader->getLocation("lightColor"), light->getColor());
-            if(light->isShadowCaster())
+            if(light->getFlags() & Light::AMBIENT_FLAG)
             {
-                light->getShadowMap()->bind(PhongMaterial::NB_PHONG_SLOTS); // NB_PHONG_SLOTS has the value of the first available slot after the phong material texture slots
-                shader->bindInteger(shader->getLocation("shadowMap"), PhongMaterial::NB_PHONG_SLOTS);
+                // render ambient lighting (opaque)
+                glEnable(GL_DEPTH_TEST);
+                glDepthFunc(GL_LESS);
+                glDisable(GL_BLEND);
             }
-            break;
-        case Light::POINT:
-            shader->bindVec3(shader->getLocation("pointLight"), light->getPos());
-            shader->bindVec3(shader->getLocation("lightColor"), light->getColor());
-            shader->bindFloat(shader->getLocation("attenuation"), light->getAttenuation());
-            break;
-        case Light::SPOT:
-            shader->bindVec3(shader->getLocation("lightColor"), light->getColor());
-            // TODO add cutoff and attenuation
-        break;
-        }
-        unsigned int id = 2;
-        for(SceneIterator<GeometryNode*>* geometryIt = scene->getGeometry();
-            geometryIt->isValid(); geometryIt->next())
-        {
-            GeometryNode* node = geometryIt->getItem();
-            shader->bindUnsignedInteger(shader->getLocation("object_identifier"), id);
-            if(node->mesh->hasInstances())
-                id += node->mesh->instances_offsets.size();
             else
-                ++id;
-            Material* mat = node->mesh->material;
-            unsigned int flags = mat->getFlags();
-            if(node->mesh->hasInstances())
-                flags |= INSTANCING_FLAG;
-            if(flags == geometryFlagList[i]) // if flag matches material
             {
+                // render directionnal lighting and point lighting (additive light)
+                glDepthFunc(GL_LEQUAL);
+                glEnable(GL_BLEND);
+                glBlendFunc(GL_ONE, GL_ONE);
+                glDepthMask(GL_FALSE);
+            }
+            Shader *shader = p.shader;
+            shader->bind();
+            switch(light->getType())
+            {
+            case Light::AMBIENT:
+                shader->bindVec3(shader->getLocation("lightColor"), light->getColor()); // add attribute, and setter for ambient lighting
+                break;
+            case Light::DIRECTIONNAL:
+                shader->bindVec3(shader->getLocation("dirLight"), -light->getDir());
+                shader->bindVec3(shader->getLocation("lightColor"), light->getColor());
+                if(light->isShadowCaster())
+                {
+                    light->getShadowMap()->bind(PhongMaterial::NB_PHONG_SLOTS); // NB_PHONG_SLOTS has the value of the first available slot after the phong material texture slots
+                    shader->bindInteger(shader->getLocation("shadowMap"), PhongMaterial::NB_PHONG_SLOTS);
+                }
+                break;
+            case Light::POINT:
+                shader->bindVec3(shader->getLocation("pointLight"), light->getPos());
+                shader->bindVec3(shader->getLocation("lightColor"), light->getColor());
+                shader->bindFloat(shader->getLocation("attenuation"), light->getAttenuation());
+                break;
+            case Light::SPOT:
+                shader->bindVec3(shader->getLocation("lightColor"), light->getColor());
+                // TODO add cutoff and attenuation
+                break;
+            }
+            unsigned int id = 2;
+            for(GeometryNode *node : p.geometry)
+            {
+                shader->bindUnsignedInteger(shader->getLocation("object_identifier"), id);
+                if(node->mesh->instances_offsets.empty())
+                    ++id;
+                else
+                    id += node->mesh->instances_offsets.size();
                 // compute matrix attributes
                 glm::mat4 modelViewMatrix = myCamera->getViewMatrix() * node->modelMatrix;
                 glm::mat4 mvp = myCamera->getProjectionMatrix() * modelViewMatrix;
@@ -116,10 +85,12 @@ void ForwardModule::lightPass(Camera* myCamera, Scene* scene, Light* light)
             }
         }
     }
+    
+    glDisable(GL_BLEND);
+    glDepthFunc(GL_LESS);
+    glDepthMask(GL_TRUE);
 }
 
-// modern opengl methods
-
 void ForwardModule::setShaderSource(ShaderSource* source)
 {
     if(shaderSources != NULL)
@@ -129,72 +100,44 @@ void ForwardModule::setShaderSource(ShaderSource* source)
 
 void ForwardModule::compileShaders(Scene* scene)
 {
-    geometryFlagList.clear();
-    lightFlagList.clear();
-    for(Shader* s : shaders)
-        delete(s);
-    shaders.clear();
-
-    // get material flags
-    const int nb_geometry_flags = 1 << NB_FLAGS;
-    bool geometryFlags[nb_geometry_flags];
-    for(int i=0; i<nb_geometry_flags; ++i)
-        geometryFlags[i] = false;
-
+    for(Pass &p : passes)
+        delete(p.shader);
+    passes.clear();
+    // list all geometry types
+    geometry.clear();
     for(SceneIterator<GeometryNode*>* geometryIt = scene->getGeometry();
         geometryIt->isValid(); geometryIt->next())
     {
-        Mesh* m = geometryIt->getItem()->mesh;
-        unsigned int flags = m->material->getFlags();
-        if(m->hasInstances())
-            flags |= INSTANCING_FLAG;
-        geometryFlags[flags] = true;
+        GeometryNode* n = geometryIt->getItem();
+        geometry[n->mesh->getFlags()].push_back(n);
     }
-    for(int i=0; i<nb_geometry_flags; ++i)
-    {
-        if(geometryFlags[i])
-            geometryFlagList.push_back(i);
-    }
-
-    // get light flags
-    const int nb_light_flags = 1 << Light::NB_LIGHT_FLAGS;
-    bool lightFlags[nb_light_flags];
-    for(int i=0; i<nb_light_flags; ++i)
-        lightFlags[i] = false;
-
-    // ambient light
-    lightFlags[Light::getFlags(NULL)] = true;
-    // scene lights
+    // list all light types
+    lights.clear();
+    lights[ambientLight.getFlags()].push_back(&ambientLight);
     for(SceneIterator<Light*>* lightIt = scene->getLights();
         lightIt->isValid(); lightIt->next())
     {
         Light* l = lightIt->getItem();
-        lightFlags[Light::getFlags(l)] = true;
+        lights[l->getFlags()].push_back(l);
     }
-    for(int i=0; i<nb_light_flags; ++i)
+    // compile shaders and add the pass for the ambient light first
+    unsigned int ambientFlags = ambientLight.getFlags();
+    for(const auto &geomIt : geometry)
     {
-        if(lightFlags[i])
-            lightFlagList.push_back(i);
+        unsigned int geomFlags = geomIt.first;
+        passes.push_back(Pass(shaderSources->compile(geomFlags, ambientFlags), geomIt.second, lights[ambientFlags]));
     }
-
-    // shader compilation
-    for(int i : geometryFlagList)
+    // compile a shader for each combination of a geometry flag and a light flag
+    for(const auto &lightIt : lights)
     {
-        std::vector<const char*> defines;
-
-        std::size_t boundary = defines.size();
-        for(int j : lightFlagList)
+        unsigned int lightFlags = lightIt.first;
+        if(lightFlags != ambientFlags) // ambient shaders are already ready
         {
-            while(defines.size() > boundary)
-                defines.pop_back();
-            // set light defines
-            for(int k=0; k<Light::NB_LIGHT_FLAGS; ++k)
+            for(const auto &geomIt : geometry)
             {
-                if(j & (1 << k))
-                    defines.push_back(Light::flagStr[k]);
+                unsigned int geomFlags = geomIt.first;
+                passes.push_back(Pass(shaderSources->compile(geomFlags, lightFlags), geomIt.second, lightIt.second));
             }
-            // compilation
-            shaders.push_back(shaderSources->compile(defines.size(), defines.data()));
         }
     }
 }
diff --git a/src/forwardmodule.h b/src/forwardmodule.h
index 9112df0..11544f8 100644
--- a/src/forwardmodule.h
+++ b/src/forwardmodule.h
@@ -9,8 +9,10 @@
 #include "shadersource.h"
 #include "material.h"
 #include "framebuffer.h"
+#include "light.h"
+#include <unordered_map>
 
-class Light;
+class GeometryNode;
 class Scene;
 class PhongEntity;
 
@@ -20,9 +22,10 @@ public:
     ForwardModule() :
         shaderSources(NULL),
         renderTarget(FrameBuffer::screen),
-        isWireframe(false),
         clearBeforeDrawing(false)
-    {}
+    {
+        ambientLight.initAmbientLight();
+    }
 
     virtual void renderGL(Camera* myCamera, Scene* scene);
     virtual bool requiresModernOpenGL() {return true;}
@@ -34,23 +37,36 @@ public:
     void compileShaders(Scene* scene);
 
     void setRenderTarget(const FrameBuffer* target);
-    void setWireframe(bool wireframe) {isWireframe = wireframe;}
     void setClearBeforeDrawing(bool clear) {clearBeforeDrawing = clear;}
 
 private:
+    struct Pass
+    {
+        Shader* shader;
+        const std::vector<GeometryNode*> &geometry;
+        const std::vector<Light*> &lights;
+        
+        Pass(Shader *myShader,
+             const std::vector<GeometryNode*> &geomIt,
+             const std::vector<Light*> &lightIt) :
+                shader(myShader),
+                geometry(geomIt),
+                lights(lightIt)
+        {}
+    };
+
+    std::unordered_map<unsigned int, std::vector<GeometryNode*>> geometry;
+    std::unordered_map<unsigned int, std::vector<Light*>> lights;
+    Light ambientLight;
+    std::vector<Pass> passes;
     ShaderSource* shaderSources;
-    std::set<Shader*> shaders;
-    std::vector<unsigned int> geometryFlagList;
-    std::vector<unsigned int> lightFlagList;
+    
     const FrameBuffer* renderTarget;
 
     int width;
     int height;
 
-    bool isWireframe;
     bool clearBeforeDrawing;
-
-    void lightPass(Camera* myCamera, Scene* scene, Light* light);
 };
 
 #endif // FORWARDMODULE_H
diff --git a/src/light.cpp b/src/light.cpp
index 1c7d23f..8c30571 100644
--- a/src/light.cpp
+++ b/src/light.cpp
@@ -28,7 +28,7 @@ Light::Light()
     initPointLight();
 }
 
-void Light::initAmbientLight(glm::vec3 lightColor = glm::vec3(0.1f))
+void Light::initAmbientLight(glm::vec3 lightColor)
 {
     type = AMBIENT;
     position = glm::vec3(0);
@@ -99,10 +99,8 @@ void Light::initShadowMap(int resWidth, int resHeight, glm::vec3 dim)
     ShaderSource source;
     source.setSource(shadowVertSource, ShaderSource::VERTEX);
     source.setSource(shadowFragSource, ShaderSource::FRAGMENT);
-    std::vector<const char*> defines;
-    shaders[0] = source.compile(defines.size(), defines.data());
-    defines.push_back("ALPHA_MASK");
-    shaders[1] = source.compile(defines.size(), defines.data());
+    shaders[0] = source.compile(Mesh::MESH_3D, getFlags());
+    shaders[1] = source.compile(Mesh::MESH_3D & Mesh::MATERIAL_ALPHA_MASK, getFlags());
 }
 
 void Light::generateShadowMap(Scene* scene)
@@ -119,26 +117,14 @@ void Light::generateShadowMap(Scene* scene)
         geometryIt->isValid(); geometryIt->next())
     {
         GeometryNode* node = geometryIt->getItem();
-        Material* mat = node->mesh->material;
-        if(((PhongMaterial*)mat)->castShadow)
+        if(node->mesh->getFlags() & Mesh::MESH_SHADOWED)
         {
             // compute matrix attributes
             glm::mat4 lightMVP = getProjectionMatrix() * (getViewMatrix() * node->modelMatrix);
-            if(mat->getFlags() & ALPHA_MASK_FLAG)
-            {
-                PhongMaterial* pmat = (PhongMaterial*)mat;
-                shaders[1]->bind();
-                pmat->alpha_mask->bind(ALPHA_MASK);
-                shaders[1]->bindMat4(shaders[1]->getLocation("MVP"), lightMVP);
-                shaders[1]->bindInteger(shaders[1]->getLocation("alphaMask"), ALPHA_MASK);
-                node->mesh->draw(shaders[1], false, true, false);
-            }
-            else
-            {
-                shaders[0]->bind();
-                shaders[0]->bindMat4(shaders[1]->getLocation("MVP"), lightMVP);
-                node->mesh->draw(shaders[0], false, false, false);
-            }
+            int hasAlpha = (node->mesh->getFlags() & Mesh::MATERIAL_ALPHA_MASK) > 0;
+            shaders[hasAlpha]->bind();
+            shaders[hasAlpha]->bindMat4(shaders[hasAlpha]->getLocation("MVP"), lightMVP);
+            node->mesh->draw(shaders[hasAlpha], false, hasAlpha, false);
         }
     }
     glCullFace(GL_BACK);
@@ -158,7 +144,7 @@ void Light::setPosition(glm::vec3 new_pos)
 unsigned int Light::getFlags()
 {
     unsigned int flags = 0;
-    switch(l->getType())
+    switch(type)
     {
     case AMBIENT :
         flags = 1 << AMBIENT_FLAG;
@@ -173,7 +159,7 @@ unsigned int Light::getFlags()
         flags = 1 << SPOT_FLAG;
         break;
     }
-    if(l->isShadowCaster())
+    if(shadowCaster)
         flags |= 1 << SHADOWMAP_FLAG;
     return flags;
 }
diff --git a/src/light.h b/src/light.h
index b44561a..21ee895 100644
--- a/src/light.h
+++ b/src/light.h
@@ -27,7 +27,7 @@ public:
         POINT_FLAG,
         SPOT_FLAG,
         SHADOWMAP_FLAG,
-        NB_LIGHT_FLAGS
+        NB_FLAGS
     };
     static const char* flagStr[];
     static const glm::mat4 biasMatrix;
diff --git a/src/mesh.cpp b/src/mesh.cpp
index c49f4c4..5efc443 100644
--- a/src/mesh.cpp
+++ b/src/mesh.cpp
@@ -17,6 +17,7 @@ const char* const Mesh::flagStr[Mesh::NB_FLAGS] =
 
     "TANGENT_SPACE",
     "BILLBOARD",
+    "SHADOWED"
 
     "COLOR_TEXTURE",
     "ALPHA_MASK",
@@ -34,6 +35,7 @@ Mesh::Mesh() :
     material(NULL),
     isDoubleSided(false),
     isBillboard(false),
+    isShadowCaster(true),
     depth(0),
     vao(0),
     primitive_type(GL_TRIANGLES)
@@ -74,21 +76,21 @@ void Mesh::initGL()
     // init positions VBO
     if(!positions3D.empty())
     {
-        b = new Buffer(positions3D, Buffer::VBO);
+        b = new TBuffer(positions3D, TBuffer::VBO);
         b->setVertexAttrib(0, 3);
         addBuffer(b, POSITION_BUFFER);
         
         // init normals vbo
         if(!normals.empty())
         {
-            b = new Buffer(normals, Buffer::VBO);
+            b = new TBuffer(normals, TBuffer::VBO);
             b->setVertexAttrib(1, 3);
             addBuffer(b, NORMAL_BUFFER);
         }
         // init tangents vbo
         if(!tangents.empty())
         {
-            b = new Buffer(tangents, Buffer::VBO);
+            b = new TBuffer(tangents, TBuffer::VBO);
             b->setVertexAttrib(3, 3);
             b->setVertexAttrib(4, 3);
             addBuffer(b, TANGENT_BUFFER);
@@ -96,7 +98,7 @@ void Mesh::initGL()
     }
     else if(!positions2D.empty())
     {
-        b = new Buffer(positions2D, Buffer::VBO);
+        b = new TBuffer(positions2D, TBuffer::VBO);
         b->setVertexAttrib(0, 2);
         addBuffer(b, POSITION_BUFFER);
     }
@@ -108,7 +110,7 @@ void Mesh::initGL()
     // init texCoords vbo
     if(!texCoords.empty())
     {
-        b = new Buffer(texCoords, Buffer::VBO);
+        b = new TBuffer(texCoords, TBuffer::VBO);
         b->setVertexAttrib(2, 2);
         addBuffer(b, TEXCOORD_BUFFER);
     }
@@ -116,7 +118,7 @@ void Mesh::initGL()
     // init instances vbo
     if(!instances_offsets.empty())
     {
-        b = new Buffer(instances_offsets, Buffer::VBO);
+        b = new TBuffer(instances_offsets, TBuffer::VBO);
         b->setVertexAttrib(5, 3, 0, 1);
         addBuffer(b, INSTANCE_BUFFER);
     }
@@ -124,7 +126,7 @@ void Mesh::initGL()
         // init EBO
     if(!indices.empty())
     {
-        b = new Buffer(indices, Buffer::EBO);
+        b = new TBuffer(indices, TBuffer::EBO);
         addBuffer(b, INDICES_BUFFER);
     }
 
diff --git a/src/mesh.h b/src/mesh.h
index 19e9918..7540467 100644
--- a/src/mesh.h
+++ b/src/mesh.h
@@ -32,6 +32,7 @@ public:
         // 3D Geometric properties
         MESH_TANGENT_SPACE,
         MESH_BILLBOARD,
+        MESH_SHADOWED,
 
         // simple material (no lighting)
         MATERIAL_COLOR_TEXTURE,
@@ -145,6 +146,12 @@ public:
      * a billboard mesh will always follow the camera orientation
      */
     void setIsBillboard(bool val) {isBillboard = val;}
+    
+    /**
+     * @brief setIsShadowCaster allows to enable or disable,
+     * rendering of this mesh in the shadowmaps
+     */
+    void setIsShadowCaster(bool val) {isShadowCaster = val;}
 
     /*************************************************************/
     /*                      3D MESH TOOLS                        */
@@ -196,6 +203,7 @@ protected:
     Material* material;
     bool isDoubleSided;
     bool isBillboard;
+    bool isShadowCaster;
     float depth;
 
     GLenum primitive_type;
diff --git a/src/phongmaterial.h b/src/phongmaterial.h
index f4e1841..487fa91 100644
--- a/src/phongmaterial.h
+++ b/src/phongmaterial.h
@@ -9,16 +9,6 @@ class Texture;
 class PhongMaterial : public Material
 {
 private:
-    enum TextureSlots
-    {
-        DIFFUSE_SLOT,
-        AMBIENT_SLOT,
-        NORMALS_SLOT,
-        SPECULAR_SLOT,
-        ALPHA_SLOT,
-        NB_PHONG_SLOTS
-    };
-
     glm::vec3 ambient;
     glm::vec3 diffuse;
     glm::vec3 specular;
@@ -31,6 +21,15 @@ private:
     Texture* alpha_mask;
 
 public:
+    enum TextureSlots
+    {
+        DIFFUSE_SLOT,
+        AMBIENT_SLOT,
+        NORMALS_SLOT,
+        SPECULAR_SLOT,
+        ALPHA_SLOT,
+        NB_PHONG_SLOTS
+    };
 
 	PhongMaterial() :
         ambient(0),
diff --git a/src/shadersource.cpp b/src/shadersource.cpp
index 63a6617..e4d57c2 100644
--- a/src/shadersource.cpp
+++ b/src/shadersource.cpp
@@ -4,6 +4,7 @@
 #include <sstream>
 #include "shader.h"
 #include "mesh.h"
+#include "light.h"
 
 ShaderSource::ShaderSource()
 {
@@ -31,11 +32,19 @@ void ShaderSource::setSource(const char *source, SourceType type)
 Shader* ShaderSource::compile(unsigned int geomFlags, unsigned int lightFlags)
 {
     std::string header = "#version 330 core";
-    for(int i=0; i<NB_FLAGS; ++i)
+    
+    for(int i=0; i<Mesh::NB_FLAGS; ++i)
     {
         if((geomFlags >> i) & 0x00000001)
-            header += "\n#define "+std::string(flagStr[i]);
+            header += "\n#define "+std::string(Mesh::flagStr[i]);
     }
+    
+    for(int i=0; i<Light::NB_FLAGS; ++i)
+    {
+        if((lightFlags >> i) & 0x00000001)
+            header += "\n#define "+std::string(Light::flagStr[i]);
+    }
+    
     header += "\n#line 1\n";
 
     if(sources[VERTEX] == NULL || sources[FRAGMENT] == NULL)
diff --git a/src/shadersource.h b/src/shadersource.h
index 4697b9e..ed70e2e 100644
--- a/src/shadersource.h
+++ b/src/shadersource.h
@@ -21,7 +21,7 @@ public:
 
     void setSource(const char *source, SourceType type);
 
-    Shader* compile(int nbDefines = 0, const char** defines = NULL);
+    Shader* compile(unsigned int geomFlags, unsigned int lightFlags);
 
 private:
     std::string* sources[NB_TYPES];