diff --git a/CMakeLists.txt b/CMakeLists.txt
index f320646..028baba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,8 +14,7 @@ endif(WIN32)
 set(LIB_SRC_LIST
     asciientity.cpp
     asciimodule.cpp
-    framebuffer.cpp
-    gbuffermodule.cpp
+	framebuffer.cpp
     lights.cpp
     meshbuilder.cpp
     phongentity.cpp
@@ -26,6 +25,7 @@ set(LIB_SRC_LIST
     sparrowrenderer.cpp
     parametricmesh.cpp
     texture.cpp
+	scene.cpp
     entityloader.cpp
 )
 
diff --git a/camera.h b/camera.h
index 06e03c0..075f5ad 100644
--- a/camera.h
+++ b/camera.h
@@ -2,8 +2,6 @@
 #define CAMERA_H
 
 #include <glm/mat4x4.hpp>
-#include <glm/vec3.hpp>
-#include <glm/vec2.hpp>
 
 class Camera{
 public:
diff --git a/gbuffermodule.cpp b/gbuffermodule.cpp
deleted file mode 100644
index 68e7c92..0000000
--- a/gbuffermodule.cpp
+++ /dev/null
@@ -1,13 +0,0 @@
-#include "gbuffermodule.h"
-#include "camera.h"
-#include "mesh.h"
-
-void GBufferModule::addMesh(Mesh* myMesh)
-{
-
-}
-
-void GBufferModule::renderGL(Camera* myCamera)
-{
-
-}
diff --git a/gbuffermodule.h b/gbuffermodule.h
deleted file mode 100644
index e9b2b55..0000000
--- a/gbuffermodule.h
+++ /dev/null
@@ -1,23 +0,0 @@
-#ifndef GBUFFERMODULE_H
-#define GBUFFERMODULE_H
-
-#include "module.h"
-#include <vector>
-#include <cstddef>
-
-class Shader;
-class Mesh;
-
-class GBufferModule : public Module
-{
-public:
-    Shader* shader;
-    std::vector<Mesh*> meshes;
-
-    GBufferModule(Shader* myShader = NULL) : shader(myShader) {}
-
-    void addMesh(Mesh* myMesh);
-    void virtual renderGL(Camera* myCamera);
-};
-
-#endif // GBUFFERMODULE_H
diff --git a/phongbump.frag b/phongbump.frag
new file mode 100644
index 0000000..8390db7
--- /dev/null
+++ b/phongbump.frag
@@ -0,0 +1,50 @@
+#version 330 core
+
+// material
+uniform vec3 materialAmbient;
+uniform vec3 materialKd;
+uniform vec3 materialKs;
+uniform float materialNs;
+
+uniform vec3 dirLight[2];
+uniform int nbPointLights;
+uniform vec3 pointLights[8];
+
+// texture
+uniform sampler2D baseTexture;
+uniform sampler2D bumpMap;
+
+// fragment
+in vec3 varNormal;
+in vec2 varTexCoord;
+
+in vec3 lightDirInView[5];
+in vec3 halfVecInView[5];
+
+// resultat
+layout(location = 0)out vec4 outColor;
+
+// --------------------
+
+vec3 computeLight(in vec3 kd, in vec3 ks, in float ns, in vec3 color, in vec3 normal, in vec3 lightDir, in vec3 halfVec){
+	float diffuse = 0;
+	float specular = 0;
+
+	diffuse = dot(normal, lightDir);
+	diffuse = diffuse < 0 ? 0 : diffuse;
+	specular = dot(halfVec, normal);
+	specular = specular < 0 ? 0 : specular;
+
+	return color*diffuse*(kd+ks*pow(specular, ns));
+}
+
+void main(void) {
+	int i;
+	vec3 kd = vec3(texture2D(baseTexture, varTexCoord))*materialKd;
+	vec3 light = 0.1*kd + computeLight(kd, materialKs, materialNs, dirLight[1], varNormal, lightDirInView[0], halfVecInView[0]);
+	for(i=1; i<nbPointLights+1; ++i)
+		light += computeLight(kd, materialKs, materialNs, pointLights[i*2 -1], varNormal, lightDirInView[i], halfVecInView[i]);
+
+	outColor = vec4(materialAmbient + light, 1);
+}
+
diff --git a/phongbump.vert b/phongbump.vert
new file mode 100644
index 0000000..6176baa
--- /dev/null
+++ b/phongbump.vert
@@ -0,0 +1,57 @@
+#version 330 core
+
+// Matrices
+uniform mat4 modelViewMatrix;
+uniform mat4 MVP;
+uniform mat4 normalMatrix;
+uniform mat4 viewMatrix;
+
+uniform vec3 dirLight[2];
+uniform int nbPointLights;
+uniform vec3 pointLights[8];
+
+layout(location = 0)in vec3 inPosition;
+layout(location = 1)in vec3 inNormal;
+layout(location = 2)in vec2 inTexCoord;
+layout(location = 2)in vec3 inTangent[2];
+
+out vec3 lightDirInView[5];
+out vec3 halfVecInView[5];
+
+out vec3 varNormal;
+out vec2 varTexCoord;
+out vec3 varTangent;
+out vec3 varBinormal;
+
+void computeDirectionnalLightingVectorsInView(in vec3 posInView, in vec3 lightDirInWorld, out vec3 lightDir, out vec3 halfVec){
+	lightDir = mat3(viewMatrix)*lightDirInWorld;
+	halfVec = normalize(normalize(lightDir) - normalize(posInView));
+	lightDir = normalize(lightDir);
+}
+
+void computePointLightingVectorsInView(in vec3 posInView, in vec3 lightPosition, out vec3 lightDir, out vec3 halfVec){
+	lightDir = vec3(viewMatrix*vec4(lightPosition, 1.0)) - posInView;
+	halfVec = normalize(lightDir - posInView);
+	lightDir = normalize(lightDir);
+}
+
+void main(void) {
+	int i;
+	computeDirectionnalLightingVectorsInView(vec3(modelViewMatrix*vec4(inPosition, 1.0)), dirLight[0], lightDirInView[0], halfVecInView[0]);
+	for(i=1; i<nbPointLights+1; ++i)
+		computePointLightingVectorsInView(vec3(modelViewMatrix*vec4(inPosition, 1.0)),
+										  pointLights[i*2 - 2],
+										  lightDirInView[i],
+										  halfVecInView[i]);
+
+	// normales corrigees (en fonction de la vue)
+	varNormal = normalize(vec3(normalMatrix*vec4(inNormal,0)));
+
+    // coordonnees de texture
+	varTexCoord = inTexCoord.xy;
+	varTangent = inTangent[0];
+	varBinormal = inTangent[1];
+
+	// position du vertex
+	gl_Position = MVP * vec4(inPosition, 1.0);
+}
diff --git a/scene.cpp b/scene.cpp
new file mode 100644
index 0000000..69a8b3c
--- /dev/null
+++ b/scene.cpp
@@ -0,0 +1 @@
+#include "scene.h"
diff --git a/scene.h b/scene.h
new file mode 100644
index 0000000..b589a02
--- /dev/null
+++ b/scene.h
@@ -0,0 +1,76 @@
+#ifndef SCENE_H
+#define SCENE_H
+
+#include <glm/mat4x4.hpp>
+#include "camera.h"
+
+// Scene Node flags :
+
+#define CAMERA_NODE 1
+#define DIRECTIONNAL_LIGHT_NODE 2
+#define POINT_LIGHT_NODE 4
+#define PHONG_NODE 8
+#define PHONG_DIFFUSE_TEXTURED_NODE 16
+#define PHONG_SPECULAR_TEXTURED_NODE 32
+#define PHONG_NORMAL_TEXTURED_NODE 64
+#define PARTICLES_NODE 128
+// up to 24 more nodes can be added here...
+
+// Scene interface :
+
+class Scene
+{
+	// the scene is supposed to contain Scene Nodes
+public:
+	// this should draw all nodes matching the specified flags.
+	virtual draw(unsigned int flags) = 0;
+};
+
+// Some basic implementations :
+
+class Mesh;
+
+class LeafNode : public SceneNode
+{
+	glm::mat4 transform;
+	std::vector<LeafNode*> children;
+public:
+	virtual void drawChildren(glm::mat4 m, unsigned int flags)
+	{
+		for(LeafNode* node : children)
+			node->drawChildren(m*transform, flags);
+	}
+};
+
+class MeshNode : public LeafNode
+{
+	Mesh* mesh;
+public:
+	virtual void drawChildren(glm::mat4 m, unsigned int flags)
+	{
+		// TODO : draw VAOs matching the flags
+		for(LeafNode* node : children)
+			node->drawChildren(m*transform, flags);
+	}
+};
+
+class TreeScene
+{
+	LeafNode* root;
+public:
+	virtual draw(unsigned int flags)
+	{
+		root->drawChildren(glm::mat4(), flags);
+	}
+};
+
+class CameraNode : public LeafNode
+{
+public:
+    virtual glm::mat4 getProjectionMatrix() = 0;
+    virtual glm::mat4 getViewMatrix() = 0;
+
+    virtual void resize(int width, int height) = 0;
+};
+
+#endif // SCENE_H