diff --git a/lod.cpp b/lod.cpp
index 3a5e79f..02dbfc4 100644
--- a/lod.cpp
+++ b/lod.cpp
@@ -58,16 +58,17 @@ void Lod::setCamera(Vertex newCamera) {
 }
 
 void Lod::doSplit(Chose* c) {
-	if (c->split()) {
-		std::vector<Chose*>::iterator it;
-		for (it = c->children.begin(); it != c->children.end(); ++it) {
-			(*it)->triangulation();
-			(*it)->updateAABB();
-			// (*it)->drawAABB();
-			addSplitCube((*it));
-		}
-		addMergeCube(c);
+	c->split();
+	std::vector<Chose*>::iterator it;
+	bool mergeCube = false;
+	for (it = c->children.begin(); it != c->children.end(); ++it) {
+		mergeCube = true;
+		(*it)->triangulation();
+		(*it)->updateAABB();
+		// (*it)->drawAABB();
+		addSplitCube((*it));
 	}
+	addMergeCube(c);
 	// else {
 	// 	// Pour debug : quand on tente de split un objet qui ne peut
 	// 	// pas l'être, on vire le dessin de sa splitBox.
diff --git a/rules/arbre.cpp b/rules/arbre.cpp
index 79e500c..e07fc8f 100644
--- a/rules/arbre.cpp
+++ b/rules/arbre.cpp
@@ -30,7 +30,7 @@ Arbre::Arbre(Vertex _start, Angle3D _rotation, float _length, Type _type) : star
 	addEntropy((int)(type));
 }
 
-bool Arbre::split() {
+void Arbre::split() {
 	if (type == ARBRE && length > floatInRange(seed, -1, 10, 20)) {
 		int nbBranches = 2 + (hash2(seed, -2) % 3);
 		for (int i = 0; i < nbBranches; i++) {
@@ -43,7 +43,6 @@ bool Arbre::split() {
 		}
 		addChild(new Arbre(start, rotation, length, TRONC));
 	}
-	return true;
 }
 
 void Arbre::triangulation() {
diff --git a/rules/arbre.hh b/rules/arbre.hh
index 34e5361..44288da 100644
--- a/rules/arbre.hh
+++ b/rules/arbre.hh
@@ -25,7 +25,7 @@ public:
 	Arbre(Vertex _start, Quad plane);
 	Arbre(Vertex _start, Triangle plane);
 	Arbre(Vertex _start, Angle3D _rotation, float _length, Type _type = ARBRE);
-	virtual bool split();
+	virtual void split();
 	virtual void triangulation();
 	virtual void getBoundingBoxPoints();
 	virtual float LODFactor();
diff --git a/rules/arche.cpp b/rules/arche.cpp
index 9accaff..9f81674 100644
--- a/rules/arche.cpp
+++ b/rules/arche.cpp
@@ -13,17 +13,16 @@ ArcheQuad::ArcheQuad(Quad _c, float _height, float _start, float _end, Type _typ
 	}
 }
 
-bool ArcheQuad::split() {
+void ArcheQuad::split() {
 	if (type == PLAT)
-		return false;
+		return;
 	if (std::abs(end - start) < 0.1 && std::abs(f(end) - f(start)) < 0.05)
-		return false;
+		return;
 	float mid = (start + end) / 2;
 	Vertex n = (c[NW] + c[NE]) / 2.f;
 	Vertex s = (c[SE] + c[SW]) / 2.f;
 	addChild(new ArcheQuad(Quad(n, s, c[SW], c[NW]), height, start, mid, type));
 	addChild(new ArcheQuad(Quad(c[NE], c[SE], s, n), height, mid, end, type));
-	return true;
 }
 
 void ArcheQuad::triangulation() {
diff --git a/rules/arche.hh b/rules/arche.hh
index 9aac67d..2482f3b 100644
--- a/rules/arche.hh
+++ b/rules/arche.hh
@@ -19,7 +19,7 @@ private:
 	Type type;
 public:
 	ArcheQuad(Quad _c, float _height, float _start = 0, float _end = 1, Type _type = RANDOM);
-	virtual bool split();
+	virtual void split();
 	virtual void triangulation();
 	virtual void getBoundingBoxPoints();
 	float f(float x);
diff --git a/rules/batiment.cpp b/rules/batiment.cpp
index 85e5d8b..0e7a9f4 100644
--- a/rules/batiment.cpp
+++ b/rules/batiment.cpp
@@ -7,7 +7,7 @@ BatimentQuad::BatimentQuad(Quad _c, bool _isSub, QuadBool _w)
 		addEntropy(w[N+i] ? 0 : 1);
 }
 
-bool BatimentQuad::split() {
+void BatimentQuad::split() {
 	if (!isSub) {
 		bordureRouteTrottoir();
 	} else {
@@ -21,8 +21,6 @@ bool BatimentQuad::split() {
 			addChild(new TerrainQuad(c));
 		}
 	}
-
-	return true;
 }
 
 void BatimentQuad::bordureRouteTrottoir() {
@@ -97,8 +95,8 @@ BatimentTri_::BatimentTri_(Triangle _c) : Chose(), c(_c) {
 	addEntropy(c);
 }
 
-bool BatimentTri_::split() {
-	return false;
+void BatimentTri_::split() {
+	// TODO : BatimentTri::split()
 }
 
 void BatimentTri_::triangulation() {
diff --git a/rules/batiment.hh b/rules/batiment.hh
index 0c7bf69..4988151 100644
--- a/rules/batiment.hh
+++ b/rules/batiment.hh
@@ -14,7 +14,7 @@ private:
 
 public:
 	BatimentQuad(Quad _c, bool _isSub = false, QuadBool _w = QuadBool(true, true, true, true));
-	virtual bool split();
+	virtual void split();
 	virtual void triangulation();
 	virtual void getBoundingBoxPoints();
 	BatimentQuad* isSubdivision(bool val);
@@ -25,7 +25,7 @@ class BatimentTri_ : public Chose {
 
 public:
 	BatimentTri_(Triangle _c);
-	virtual bool split();
+	virtual void split();
 	virtual void triangulation();
 	virtual void getBoundingBoxPoints();
 };
diff --git a/rules/chose.cpp b/rules/chose.cpp
index e4c2616..c7a3b7c 100644
--- a/rules/chose.cpp
+++ b/rules/chose.cpp
@@ -26,9 +26,8 @@ void Chose::addChild(Chose* c) {
 	children.push_back(c);
 }
 
-bool Chose::merge() {
+void Chose::merge() {
 	clearChildren();
-	return true;
 }
 
 void Chose::addGPUTriangle(Vertex left, Vertex top, Vertex right, unsigned int rgb) {
diff --git a/rules/chose.hh b/rules/chose.hh
index 838e59a..6106822 100644
--- a/rules/chose.hh
+++ b/rules/chose.hh
@@ -16,8 +16,8 @@ public :
 	void display();
 	void displayNormals();
 	void drawAABB(); // DEBUG
-	virtual bool split() { return false; };
-	virtual bool merge();
+	virtual void split() {};
+	virtual void merge();
 	virtual void triangulation() { clearTriangles(); };
 	virtual void updateAABB();
 
diff --git a/rules/etage.cpp b/rules/etage.cpp
index 3930a8a..a6de9df 100644
--- a/rules/etage.cpp
+++ b/rules/etage.cpp
@@ -12,7 +12,7 @@ void EtageQuad::getBoundingBoxPoints() {
 	addBBPoints(ch);
 }
 
-bool EtageQuad::split() {
+void EtageQuad::split() {
 	if (nbEtages > 1 && etage == 0 && ((w[N] && w[S]) || (w[E] && w[W])) && c.minLengthEW() > 800 && proba(seed, 0, 0.8)) {
 		Quad q = c << ((w[N] && w[S]) ? 0 : 1);
 		Quad qh = ch << ((w[N] && w[S]) ? 0 : 1);
@@ -61,7 +61,6 @@ bool EtageQuad::split() {
 	}
 	addChild(new PlancherPlafond(c, PlancherPlafond::PLANCHER));
 	addChild(new PlancherPlafond(ch.offsetNormal(-10), PlancherPlafond::PLAFOND));
-    return true;
 }
 
 void EtageQuad::triangulation() {
diff --git a/rules/etage.hh b/rules/etage.hh
index 15952db..f7f12ff 100644
--- a/rules/etage.hh
+++ b/rules/etage.hh
@@ -14,7 +14,7 @@ class EtageQuad : public Chose {
 
     public :
 	EtageQuad(Quad c, Quad ch, QuadBool _w, int _etage, int _nbEtages);
-	virtual bool split();
+	virtual void split();
 	virtual void triangulation();
 	virtual void getBoundingBoxPoints();
 };
diff --git a/rules/mur.cpp b/rules/mur.cpp
index 0574830..24cba7f 100644
--- a/rules/mur.cpp
+++ b/rules/mur.cpp
@@ -25,9 +25,9 @@ void MurQuad::setWindowOrDoor() {
     windowPosh = Quad(wFront[NE],wBack[NE],wBack[NW],wFront[NW]);
 }
 
-bool MurQuad::split() {
+void MurQuad::split() {
     if(!(window || door))
-        return false;
+        return;
 
     float length = c.maxLengthNS();
 
@@ -52,8 +52,6 @@ bool MurQuad::split() {
         addChild(new MurQuad(left,lefth,false));
         addChild(new MurQuad(right,righth,false));
     }
-
-    return true;
 }
 
 void MurQuad::triangulation() {
diff --git a/rules/mur.hh b/rules/mur.hh
index 2598d98..27670b8 100644
--- a/rules/mur.hh
+++ b/rules/mur.hh
@@ -18,7 +18,7 @@ public :
 
 	MurQuad(Quad c, Quad ch, bool _window=false, bool _top=false, bool _bottom=false, bool _door=false);
 	virtual void triangulation();
-	virtual bool split();
+	virtual void split();
 	virtual void getBoundingBoxPoints();
 	void setWindowOrDoor();
 };
diff --git a/rules/quartier.cpp b/rules/quartier.cpp
index d50b487..2305286 100644
--- a/rules/quartier.cpp
+++ b/rules/quartier.cpp
@@ -8,7 +8,7 @@ void QuartierQuad::getBoundingBoxPoints() {
 	addBBPoints(c, Dimensions::hauteurMaxBatiment);
 }
 
-bool QuartierQuad::split() {
+void QuartierQuad::split() {
 	bool small = c.minLength() < 35 * 100;
 	bool big = (c.minLengthNS() > 100 * 100 || c.minLengthEW() > 100 * 100) && c.minLength() > 40*100 && c.maxLength() < 300*100;
 	bool isConcave = c.isConcave();
@@ -36,7 +36,6 @@ bool QuartierQuad::split() {
 		carre();
 	else
 		addChild(new BatimentQuad(c));
-	return true;
 }
 
 void QuartierQuad::triangulation() {
@@ -163,7 +162,7 @@ void QuartierTri::getBoundingBoxPoints() {
 	addBBPoints(c, Dimensions::hauteurMaxBatiment);
 }
 
-bool QuartierTri::split() {
+void QuartierTri::split() {
 	bool small = c.minLength() < 6000;
 	bool big = c.maxLength() >= 10000;
 	float minAngle = c.minAngle();
@@ -190,7 +189,6 @@ bool QuartierTri::split() {
 	} else {
 		batiments(); // TODO : addChild(new BatimentTri_(c));
 	}
-	return true;
 }
 
 void QuartierTri::triangulation() {
diff --git a/rules/quartier.hh b/rules/quartier.hh
index 8fb13aa..e299093 100644
--- a/rules/quartier.hh
+++ b/rules/quartier.hh
@@ -9,7 +9,7 @@ private:
 public:
 	QuartierQuad(Quad _c);
 	virtual void getBoundingBoxPoints();
-	virtual bool split();
+	virtual void split();
 	virtual void triangulation();
 private:
 	void triangulationConcave(Triangle t);
@@ -28,7 +28,7 @@ private:
 public:
 	QuartierTri(Triangle _c);
 	virtual void getBoundingBoxPoints();
-	virtual bool split();
+	virtual void split();
 	virtual void triangulation();
 private:
 	void centre();
diff --git a/rules/terrain.cpp b/rules/terrain.cpp
index 3e7118a..35b34e6 100644
--- a/rules/terrain.cpp
+++ b/rules/terrain.cpp
@@ -4,8 +4,8 @@ TerrainQuad::TerrainQuad(Quad _c, bool _addTrees) : Chose(), c(_c), addTrees(_ad
 	addEntropy(c);
 }
 
-bool TerrainQuad::split() {
-	if (!addTrees) return false;
+void TerrainQuad::split() {
+	if (!addTrees) return;
 
 	addChild(new TerrainQuad(c, false));
 
@@ -27,7 +27,6 @@ bool TerrainQuad::split() {
 	for (int i = 0; i < pi; i++) {
 		addChild(new Arbre(p[i], c));
 	}
-	return true;
 }
 
 void TerrainQuad::getBoundingBoxPoints() {
diff --git a/rules/terrain.hh b/rules/terrain.hh
index da0d93b..a845df2 100644
--- a/rules/terrain.hh
+++ b/rules/terrain.hh
@@ -20,7 +20,7 @@ class TerrainQuad : public Chose {
 
     public :
 	TerrainQuad(Quad _c, bool _addTrees = true);
-	virtual bool split();
+	virtual void split();
 	virtual void triangulation();
 	virtual void getBoundingBoxPoints();
 };