diff --git a/Makefile b/Makefile
index f9cafc7..3b112de 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ CXX=g++
 CCWARN=-Wall -Wextra -Werror
 # TODO : -O3 -m32 ou -m64
 # -g -rdynamic uniquement pour le debug.
-CFLAGS=-O0 -g -rdynamic -m32 -I. $(CCWARN)
+CFLAGS=-O0 -g -rdynamic -I. $(CCWARN)
 
 SOURCES = $(shell echo *.cpp geometry/*.cpp rules/*.cpp rules/*/*.cpp)
 HEADERS = $(shell echo *.hh  geometry/*.hh  rules/*.hh  rules/*/*.hh)
diff --git a/all_includes.hh b/all_includes.hh
index 9c1039b..ea37d53 100644
--- a/all_includes.hh
+++ b/all_includes.hh
@@ -1,8 +1,6 @@
 #ifndef _ALL_INCLUDES_HH_
 #define _ALL_INCLUDES_HH_
 
-typedef long long int64;
-
 class Chose;
 
 // DEBUG
diff --git a/geometry/angle.hh b/geometry/angle.hh
index 07a0cc2..f38bea7 100644
--- a/geometry/angle.hh
+++ b/geometry/angle.hh
@@ -2,10 +2,10 @@
 #define _GEOMETRY_ANGLE_HH_
 
 namespace Angle {
-	const float Pi = 3.141592653589793238462643383279;
 	const double dPi = 3.141592653589793238462643383279;
+	const float Pi = (float)(dPi);
 	float r2d(float rad) { return rad / Pi * 180; }
 	float d2r(float deg) { return deg / 180 * Pi; }
-};
+}
 
 #endif
diff --git a/geometry/directions.hh b/geometry/directions.hh
index c57faa7..2b95b26 100644
--- a/geometry/directions.hh
+++ b/geometry/directions.hh
@@ -10,9 +10,12 @@ enum Cardinal {
 
 inline Cardinal operator+(Cardinal c, int i) {
 	return Cardinal((int(c) + int(i)) & 3);
+	//int result = int(c) << (i & 3);
+	//result = result | result >> 4;
+	//return Cardinal (c & 15);
 }
 inline Cardinal operator-(Cardinal c, int i) {
-	return Cardinal((int(c) - int(i)) & 3);
+	return c + (-i);
 }
 
 enum Coin {
@@ -26,7 +29,7 @@ inline Coin operator+(Coin c, int i) {
 	return Coin((int(c) + int(i)) & 3);
 }
 inline Coin operator-(Coin c, int i) {
-	return Coin((int(c) - int(i)) & 3);
+	return c + (-i);
 }
 
 enum SommetTriangle {
diff --git a/geometry/quad.cpp b/geometry/quad.cpp
index 7818116..0444f7b 100644
--- a/geometry/quad.cpp
+++ b/geometry/quad.cpp
@@ -28,7 +28,7 @@ Quad Quad::insetNESW(float offset) const {
 }
 
 Quad Quad::makeParallelogram() const {
-    int l1, l2;
+    float l1, l2;
     Quad q(c[NE],c[SE],c[SW],c[NW]);
 
     if(length(N) < length(S)) {
diff --git a/geometry/segment.cpp b/geometry/segment.cpp
index a7681a1..e4b745d 100644
--- a/geometry/segment.cpp
+++ b/geometry/segment.cpp
@@ -11,15 +11,15 @@ Segment Segment::reduce(float value) {
     return Segment(u,u+((v - u) / reduc));
 }
 
-int Segment::width() {
+float Segment::width() {
 	return std::abs(u.x - v.x);
 }
 
-int Segment::height() {
+float Segment::height() {
 	return std::abs(u.y - v.y);
 }
 
-Vertex Segment::randomPos(int seed, int n, int a, int b) {
-	int pos = hashInRange(seed, n, a, b);
-	return (u * pos + v * (100-pos)) / 100;
+Vertex Segment::randomPos(int seed, int n, float a, float b) {
+	float pos = floatInRange(seed, n, a, b);
+	return (u * pos + v * (1-pos));
 }
diff --git a/geometry/segment.hh b/geometry/segment.hh
index 91eb048..34728d6 100644
--- a/geometry/segment.hh
+++ b/geometry/segment.hh
@@ -11,10 +11,10 @@ class Segment {
     public :
 	Segment(Vertex u, Vertex v);
 	float length();
-	int width();
-	int height();
+	float width();
+	float height();
 	Segment reduce(float value);
-	Vertex randomPos(int seed, int n, int a, int b); // Renvoir un vertex sur le segment [u,v], à une position entre a% and b%.
+	Vertex randomPos(int seed, int n, float a, float b); // Renvoie un vertex sur le segment [u,v], à une position entre a et b.
 };
 
 #endif
diff --git a/geometry/triangle.cpp b/geometry/triangle.cpp
index 6a3a687..aaef0ae 100644
--- a/geometry/triangle.cpp
+++ b/geometry/triangle.cpp
@@ -51,7 +51,7 @@ Triangle operator+(const Triangle& t, const Vertex& v) {
 }
 
 Vertex Triangle::randomPoint(int seed, int n) const {
-	float rndl = hashInRange(seed, n, 0, 100);
-	float rndr = hashInRange(seed, hash2(n, 42), 0, 100 - rndl);
+	float rndl = floatInRange(seed, n, 0, 100);
+	float rndr = floatInRange(seed, hash2(n, 42), 0, 100 - rndl);
 	return c[TOP] + (c[LEFT] - c[TOP]) * (rndl/100.f) + (c[RIGHT] - c[TOP]) * (rndr/100.f);
 }
diff --git a/geometry/vertex.cpp b/geometry/vertex.cpp
index 4fb9fec..efe2c6e 100644
--- a/geometry/vertex.cpp
+++ b/geometry/vertex.cpp
@@ -6,19 +6,15 @@ Vertex::Vertex(float x, float y, float z): x(x), y(y), z(z) {}
 
 float Vertex::norm() const { return std::sqrt(x*x + y*y + z*z); }
 
-// TODO : this is 2D only, use Vertex2d.
+// TODO : Ce code ne marche qu'en 2D !
 Vertex intersection(Vertex a, Vertex b, Vertex c, Vertex d) {
 	// Note : si les deux lignes sont parallèles, on risque fort
 	// d'avoir une division par zéro.
 	// http://en.wikipedia.org/wiki/Line-line_intersection
-	int64 x1 = a.x; int64 y1 = a.y;
-	int64 x2 = b.x; int64 y2 = b.y;
-	int64 x3 = c.x; int64 y3 = c.y;
-	int64 x4 = d.x; int64 y4 = d.y;
-	int64 denominator =  ((x1-x2)*(y3-y4) - (y1-y2)*(x3-x4));
+	float denominator =  ((a.x-b.x)*(c.y-d.y) - (a.y-b.y)*(c.x-d.x));
 	return Vertex(
-		((x1*y2-y1*x2)*(x3-x4) - (x1-x2)*(x3*y4-y3*x4)) / denominator,
-		((x1*y2-y1*x2)*(y3-y4) - (y1-y2)*(x3*y4-y3*x4)) / denominator,
+		((a.x*b.y-a.y*b.x)*(c.x-d.x) - (a.x-b.x)*(c.x*d.y-c.y*d.x)) / denominator,
+		((a.x*b.y-a.y*b.x)*(c.y-d.y) - (a.y-b.y)*(c.x*d.y-c.y*d.x)) / denominator,
 		0
 	);
 }
@@ -49,8 +45,6 @@ float Vertex::angle(Vertex v) const {
 	return std::acos(cosAngle(v));
 }
 
-Vertex::operator Vertex() { return Vertex(x,y,z); }
-
 std::ostream& operator<<(std::ostream& os, const Vertex& v) {
 	return os << "(" << v.x << "," << v.y << "," << v.z << ")";
 }
@@ -87,9 +81,9 @@ Vertex operator/(const Vertex& v, const float f) {
 Vertex Vertex::fromSpherical(float r, float xAngle, float yAngle) {
 	// http://electron9.phys.utk.edu/vectors/3dcoordinates.htm
 	return Vertex(
-		r * std::sin(xAngle / 180 * 3.14159) * std::cos(yAngle / 180 * 3.14159),
-		r * std::sin(xAngle / 180 * 3.14159) * std::sin(yAngle / 180 * 3.14159),
-		r * std::cos(xAngle / 180 * 3.14159)
+		r * std::sin(xAngle / 180.f * Angle::Pi) * std::cos(yAngle / 180.f * Angle::Pi),
+		r * std::sin(xAngle / 180.f * Angle::Pi) * std::sin(yAngle / 180.f * Angle::Pi),
+		r * std::cos(xAngle / 180.f * Angle::Pi)
 	);
 }
 
diff --git a/geometry/vertex.hh b/geometry/vertex.hh
index fc6fd27..a9dba0e 100644
--- a/geometry/vertex.hh
+++ b/geometry/vertex.hh
@@ -22,7 +22,6 @@ class Vertex {
 	friend Vertex intersection(Vertex a, Vertex b, Vertex c, Vertex d); // Intersection entre (a,b) et (c,d).
 
 	public :
-	operator Vertex();
 	friend std::ostream& operator<<(std::ostream& os, const Vertex& v);
 	friend Vertex operator+(const Vertex& u, const Vertex& v);
 	friend Vertex operator-(const Vertex& u, const Vertex& v);
diff --git a/hash.cpp b/hash.cpp
index 65ad0ec..380eab1 100644
--- a/hash.cpp
+++ b/hash.cpp
@@ -24,10 +24,28 @@ unsigned int hash2(unsigned int a, unsigned int b) {
 	return h;
 }
 
-int hashInRange(int seed, int n, int a, int b) {
-	return (hash2(seed, n) % (b - a)) + a;
+float floatInRange(int seed, int n, float a, float b) {
+	// 24 bits de précision, ça devrait suffire pour la plupart des utilisations.
+	return (float)(hash2(seed, n) & 0xffffff) / (float)(0x1000000) * (b-a) + a;
 }
 
 bool proba(int seed, int n, unsigned int a, unsigned int b) {
 	return ((hash2(seed, n) % b) < a);
 }
+
+unsigned int float2uint(float f) {
+	// TODO : il y a plein de problèmes avec cette conversion :
+	// 1) Il y a plusieurs représentations possibles pour le même float,
+	//    donc si on re-split un objet 10 minutes après et qu'on n'a pas
+	//    la même représentation, on n'aura pas la même entropie pour les hash.
+	// 2) On ne peut pas faire juste fi.f = f; return fi.ui; car si
+	//    sizeof(int) > sizeof(float), on lira des saletés.
+	// 3) De toute façon, tout ça est principalement du "undefined behaviour".
+	FloatUIntUnion fi;
+	for (unsigned int i = 0; i < sizeof(fi); i++) {
+		// effacer la structure.
+		reinterpret_cast<char*>(&fi)[i] = 0;
+	}
+	fi.f = f;
+	return fi.ui;
+}
diff --git a/hash.hh b/hash.hh
index 036200a..7077309 100644
--- a/hash.hh
+++ b/hash.hh
@@ -6,7 +6,12 @@
 int random_seed();
 
 unsigned int hash2(unsigned int a, unsigned int b);
-int hashInRange(int seed, int n, int a, int b); // Renvoie le n-ième nombre aléatoire dérivé de seed entre a et b (a inclus, b non inclus).
+float floatInRange(int seed, int n, float a, float b); // Renvoie le n-ième nombre aléatoire dérivé de seed entre a et b (a inclus, b non inclus).
 bool proba(int seed, int n, unsigned int a, unsigned int b); // Renvoie vrai avec `a` fois sur `b`.
+typedef union FloatUIntUnion {
+	float f;
+	unsigned int ui;
+} FloatUIntUnion;
+unsigned int float2uint(float f);
 
 #endif
diff --git a/heap.cpp b/heap.cpp
index 69b7997..fbb724c 100644
--- a/heap.cpp
+++ b/heap.cpp
@@ -3,7 +3,7 @@ Heap::Heap()
 	  bucketArraySize(1), lastNode(-1) {
 }
 
-void Heap::init(int id, int factor) { this->id = id; this->factor = factor; }
+void Heap::init(int id, int factor) { this->id = id; this->factor = (float)factor; }
 
 void Heap::insert(float key, Chose* value) {
 	++lastNode;
diff --git a/heap.hh b/heap.hh
index 835efee..0787d39 100644
--- a/heap.hh
+++ b/heap.hh
@@ -30,7 +30,7 @@ private:
 	inline int leftchild(int node) { return node * 2 + 1; }
 	inline int rightchild(int node) { return node * 2 + 2; }
 public:
-	int factor;
+	float factor; // -1.f ou +1.f
 	Heap();
 	void insert(float key, Chose* value);
 	void remove(Chose* value);
diff --git a/main.cpp b/main.cpp
index d526814..10a4d98 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,9 +1,12 @@
 #include "all_includes.hh"
 
+// TODO : créer les routes dans les bâtiments
+// TODO : faire des enum SetCoin, SetCardinal, SetSommetTriangle, SetCoteTriangle.
+
 int main() {
 	// Générer une tile de base
 	std::cout << "Initial seed = " << Chose::initialSeed << std::endl;
-	int size = 20000;
+	float size = 20000;
 	Vertex ne(size, size, 0);
 	Vertex se(size, 0, 0);
 	Vertex sw(0, 0, 0);
diff --git a/rules/batiment/batimentquad.cpp b/rules/batiment/batimentquad.cpp
index 8215614..5d6b515 100644
--- a/rules/batiment/batimentquad.cpp
+++ b/rules/batiment/batimentquad.cpp
@@ -17,7 +17,7 @@ bool BatimentQuad::split() {
         //addQuad(c[SE],c[SW],c[NW],c[NE],0xDD,0xDD,0xDD);
         addChild(new BatimentQuadMaisonPont(q,800));
 	} else {
-        int th = 20;        // Terrain height.
+        float th = 20;        // Terrain height.
         Quad q = Quad(c[NE],c[SE],c[SW],c[NW]).insetNESW(140);
 
         addChild(new TrottoirQuadNormal(Quad(c[NE],c[SE],q[SE],q[NE]),th));
@@ -36,9 +36,8 @@ bool BatimentQuad::split() {
 void BatimentQuad::triangulation() {
 	triangles.reserve(12);
 
-	int h = hashInRange(seed,1,minHeight,maxHeight);
-	int htoit = hashInRange(seed,2,minHeight/2,maxHeight/2);
-	h += htoit;
+	float h = floatInRange(seed,1,minHeight,maxHeight);
+	float htoit = floatInRange(seed,2,minHeight/2,maxHeight/2);
 
-    addGPUOcto(c, c + Vertex(0,0,h), 0xFF, 0xFF, 0x00);
+    addGPUOcto(c, c + Vertex(0,0,h + htoit), 0xFF, 0xFF, 0x00);
 }
diff --git a/rules/batiment/batimentquadblock.cpp b/rules/batiment/batimentquadblock.cpp
index 5e6d8d7..d4608ad 100644
--- a/rules/batiment/batimentquadblock.cpp
+++ b/rules/batiment/batimentquadblock.cpp
@@ -1,6 +1,6 @@
 #include "all_includes.hh"
 
-BatimentQuadBlock::BatimentQuadBlock(Quad c, int height) : Chose(), c(c), height(height) {
+BatimentQuadBlock::BatimentQuadBlock(Quad c, float height) : Chose(), c(c), height(height) {
 	addEntropy(c);
 }
 
diff --git a/rules/batiment/batimentquadblock.hh b/rules/batiment/batimentquadblock.hh
index e1e9cc9..a37003f 100644
--- a/rules/batiment/batimentquadblock.hh
+++ b/rules/batiment/batimentquadblock.hh
@@ -7,10 +7,10 @@
 class BatimentQuadBlock : public Chose {
     private :
 	Quad c;
-	int height;
+	float height;
 
     public :
-	BatimentQuadBlock(Quad c, int height);
+	BatimentQuadBlock(Quad c, float height);
 	virtual bool split();
 	virtual void triangulation();
 	virtual void getBoundingBoxPoints();
diff --git a/rules/batiment/batimentquadfenetre.cpp b/rules/batiment/batimentquadfenetre.cpp
index d41d88f..a7f32f7 100644
--- a/rules/batiment/batimentquadfenetre.cpp
+++ b/rules/batiment/batimentquadfenetre.cpp
@@ -1,6 +1,6 @@
 #include "all_includes.hh"
 
-BatimentQuadFenetre::BatimentQuadFenetre(Quad c, int height) : Chose(), c(c), height(height) {
+BatimentQuadFenetre::BatimentQuadFenetre(Quad c, float height) : Chose(), c(c), height(height) {
 	addEntropy(c);
 }
 
diff --git a/rules/batiment/batimentquadfenetre.hh b/rules/batiment/batimentquadfenetre.hh
index 0b57f68..6773cb3 100644
--- a/rules/batiment/batimentquadfenetre.hh
+++ b/rules/batiment/batimentquadfenetre.hh
@@ -6,11 +6,11 @@
 class BatimentQuadFenetre: public Chose {
     private :
 	Quad c;
-	int height;
+	float height;
 
     public :
 
-	BatimentQuadFenetre(Quad c, int height);
+	BatimentQuadFenetre(Quad c, float height);
 	virtual void triangulation();
 	virtual void getBoundingBoxPoints();
 };
diff --git a/rules/batiment/batimentquadmaison.cpp b/rules/batiment/batimentquadmaison.cpp
index ea1de73..826c8e8 100644
--- a/rules/batiment/batimentquadmaison.cpp
+++ b/rules/batiment/batimentquadmaison.cpp
@@ -12,8 +12,8 @@ void BatimentQuadMaison::getBoundingBoxPoints() {
 void BatimentQuadMaison::triangulation() {
 	triangles.reserve(12);
 
-	int h = hashInRange(seed,0,minHeight,maxHeight);
-	int htoit = hashInRange(seed,0,minHeight/2,maxHeight/2);
+	float h = floatInRange(seed,0,minHeight,maxHeight);
+	float htoit = floatInRange(seed,0,minHeight/2,maxHeight/2);
 	Quad ch = c + Vertex(0,0,h);
 	Vertex toit = (ch[NE] + ch[SE] + ch[SW] + ch[NW]) / 4 + Vertex(0,0,htoit);
 
diff --git a/rules/batiment/batimentquadmaisonpont.cpp b/rules/batiment/batimentquadmaisonpont.cpp
index a702b19..55877c3 100644
--- a/rules/batiment/batimentquadmaisonpont.cpp
+++ b/rules/batiment/batimentquadmaisonpont.cpp
@@ -1,6 +1,6 @@
 #include "all_includes.hh"
 
-BatimentQuadMaisonPont::BatimentQuadMaisonPont(Quad c, int height) : Chose(), c(c), height(height) {
+BatimentQuadMaisonPont::BatimentQuadMaisonPont(Quad c, float height) : Chose(), c(c), height(height) {
 	addEntropy(c);
 }
 
@@ -14,7 +14,7 @@ bool BatimentQuadMaisonPont::split() {
 	if(Segment(q[NE],q[NW]).length() < Segment(q[NE],q[SE]).length())
         q = q << 1;
     float partLength = Segment(q[NE],q[NW]).length() / 3;
-    int partHeight = 2.5*height/3.;
+    float partHeight = 2.5f * height / 3.f;
     Quad qa = q.inset(E,2*partLength);
     Quad qb = q.inset(W,2*partLength);
     Quad qc = q.inset(E, partLength).inset(W, partLength);
@@ -31,15 +31,15 @@ bool BatimentQuadMaisonPont::split() {
 }
 
 void BatimentQuadMaisonPont::triangulation() {
-	float h = 2.5*height/3.;
+	float h = 2.5f * height / 3.f;
 	Quad q = c.makeParallelogram();
 	Quad qh = q + Vertex(0,0,h);
 
     addGPUQuad(c,0x80,0x80,0x80);
     addGPUOcto(q,qh,0xF1,0xE0,0xE0);
 
-    Vertex ce = qh[SE] + (qh[NE] - qh[SE])/2 + Vertex(0,0,0.5*height/3.f);
-    Vertex cw = qh[SW] + (qh[NW] - qh[SW])/2 + Vertex(0,0,0.5*height/3.f);
+    Vertex ce = qh[SE] + (qh[NE] - qh[SE])/2 + Vertex(0,0,0.5f * height / 3.f);
+    Vertex cw = qh[SW] + (qh[NW] - qh[SW])/2 + Vertex(0,0,0.5f * height / 3.f);
 
     addGPUTriangle(qh[NW],cw,qh[SW],0xF1,0xE0,0xE0);
     addGPUTriangle(qh[SE],ce,qh[NE],0xF1,0xE0,0xE0);
diff --git a/rules/batiment/batimentquadmaisonpont.hh b/rules/batiment/batimentquadmaisonpont.hh
index 78763ce..c3b4669 100644
--- a/rules/batiment/batimentquadmaisonpont.hh
+++ b/rules/batiment/batimentquadmaisonpont.hh
@@ -7,11 +7,11 @@
 class BatimentQuadMaisonPont: public Chose {
     private :
 	Quad c;
-	int height;
+	float height;
 
     public :
 
-	BatimentQuadMaisonPont(Quad c, int height);
+	BatimentQuadMaisonPont(Quad c, float height);
 	virtual bool split();
 	virtual void triangulation();
 	virtual void getBoundingBoxPoints();
diff --git a/rules/batiment/batimentquadmur.cpp b/rules/batiment/batimentquadmur.cpp
index ca620d8..db32a96 100644
--- a/rules/batiment/batimentquadmur.cpp
+++ b/rules/batiment/batimentquadmur.cpp
@@ -1,6 +1,6 @@
 #include "all_includes.hh"
 
-BatimentQuadMur::BatimentQuadMur(Quad c, int height) : Chose(), c(c), height(height) {
+BatimentQuadMur::BatimentQuadMur(Quad c, float height) : Chose(), c(c), height(height) {
 	addEntropy(c);
 }
 
diff --git a/rules/batiment/batimentquadmur.hh b/rules/batiment/batimentquadmur.hh
index 3630ef6..2be5581 100644
--- a/rules/batiment/batimentquadmur.hh
+++ b/rules/batiment/batimentquadmur.hh
@@ -6,11 +6,11 @@
 class BatimentQuadMur: public Chose {
     private :
 	Quad c;
-	int height;
+	float height;
 
     public :
 
-	BatimentQuadMur(Quad c, int height);
+	BatimentQuadMur(Quad c, float height);
 	virtual void triangulation();
 	virtual void getBoundingBoxPoints();
 };
diff --git a/rules/batiment/batimentquadpont.cpp b/rules/batiment/batimentquadpont.cpp
index b66f6c3..8d487c1 100644
--- a/rules/batiment/batimentquadpont.cpp
+++ b/rules/batiment/batimentquadpont.cpp
@@ -1,6 +1,6 @@
 #include "all_includes.hh"
 
-BatimentQuadPont::BatimentQuadPont(Quad c, int height) : Chose(), c(c), height(height) {
+BatimentQuadPont::BatimentQuadPont(Quad c, float height) : Chose(), c(c), height(height) {
 	addEntropy(c);
 }
 
@@ -10,11 +10,11 @@ void BatimentQuadPont::getBoundingBoxPoints() {
 }
 
 float ct(float x) {
-    return  -(1.*cosh(x/1.))+1;
+    return (float)(1 - cosh(x / 1.f));
 }
 
-float nt(double x, int height) {
-    return (ct(x) + -ct(-1.7))/(ct(0)+ -ct(-1.7)) * height;
+float nt(float x, float height) {
+    return (ct(x) + -ct(-1.7f))/(ct(0)+ -ct(-1.7f)) * height;
 }
 
 void BatimentQuadPont::triangulation() {
@@ -29,9 +29,9 @@ void BatimentQuadPont::triangulation() {
     Vertex l1 = c[NE] - c[NW];
     Vertex l2 = c[SW] - c[SE];
 
-    float pas = 0.1;
-    int steps = (3.14/pas);
-    float n2 = l2.norm()/(3.14/pas);
+    float pas = 0.1f;
+    int steps = (int)(Angle::Pi / pas);
+    float n2 = l2.norm()/(Angle::Pi / pas);
     n2=n2;
     int middle = steps/2;
     int n;
@@ -39,7 +39,7 @@ void BatimentQuadPont::triangulation() {
     addGPUTriangle(c[SW],pb,ch[SW],0xD0,0xD0,0xD0);
     addGPUTriangle(pa,c[NW],ch[NW],0xD0,0xD0,0xD0);
 
-    for(var=-1.7,n=0; var <= 1.7; var+=pas,n++) {
+    for(var=-1.7f, n=0; var <= 1.7f; var+=pas, n++) {
         q = q.inset(W,n2);
         a = q[NW] + Vertex(0,0,nt(var,height));
         b = q[SW] + Vertex(0,0,nt(var,height));
diff --git a/rules/batiment/batimentquadpont.hh b/rules/batiment/batimentquadpont.hh
index 1cb71a9..f423f00 100644
--- a/rules/batiment/batimentquadpont.hh
+++ b/rules/batiment/batimentquadpont.hh
@@ -7,10 +7,10 @@
 class BatimentQuadPont: public Chose {
     private :
 	Quad c;
-	int height;
+	float height;
 
     public :
-	BatimentQuadPont(Quad c, int height);
+	BatimentQuadPont(Quad c, float height);
 	virtual void triangulation();
 	virtual void getBoundingBoxPoints();
 };
diff --git a/rules/batiment/batimentquadtoit.cpp b/rules/batiment/batimentquadtoit.cpp
index 0f11e19..3f81560 100644
--- a/rules/batiment/batimentquadtoit.cpp
+++ b/rules/batiment/batimentquadtoit.cpp
@@ -1,6 +1,6 @@
 #include "all_includes.hh"
 
-BatimentQuadToit::BatimentQuadToit(Quad c, int height) : Chose(), c(c), height(height) {
+BatimentQuadToit::BatimentQuadToit(Quad c, float height) : Chose(), c(c), height(height) {
 	addEntropy(c);
 }
 
@@ -10,8 +10,8 @@ void BatimentQuadToit::getBoundingBoxPoints() {
 }
 
 void BatimentQuadToit::triangulation() {
-    Vertex ce = c[SE] + (c[NE] - c[SE])/2 + Vertex(0,0,height/3.);
-    Vertex cw = c[SW] + (c[NW] - c[SW])/2 + Vertex(0,0,height/3.);
+    Vertex ce = c[SE] + (c[NE] - c[SE])/2 + Vertex(0,0,height / 3.f);
+    Vertex cw = c[SW] + (c[NW] - c[SW])/2 + Vertex(0,0,height / 3.f);
 
     addGPUTriangle(c[NW],cw,c[SW],0xF1,0xE0,0xE0);
     addGPUTriangle(c[SE],ce,c[NE],0xF1,0xE0,0xE0);
diff --git a/rules/batiment/batimentquadtoit.hh b/rules/batiment/batimentquadtoit.hh
index 45d5700..7d28905 100644
--- a/rules/batiment/batimentquadtoit.hh
+++ b/rules/batiment/batimentquadtoit.hh
@@ -7,11 +7,11 @@
 class BatimentQuadToit: public Chose {
     private :
 	Quad c;
-	int height;
+	float height;
 
     public :
 
-	BatimentQuadToit(Quad c, int height);
+	BatimentQuadToit(Quad c, float height);
 	virtual void triangulation();
 	virtual void getBoundingBoxPoints();
 };
diff --git a/rules/batiment/batimenttri.cpp b/rules/batiment/batimenttri.cpp
index 0cf8900..d4593fe 100644
--- a/rules/batiment/batimenttri.cpp
+++ b/rules/batiment/batimenttri.cpp
@@ -39,11 +39,10 @@ bool BatimentTri::split() {
 }
 
 void BatimentTri::triangulation() {
-	int h = hashInRange(seed,1,minHeight,maxHeight);
-	// int htoit = hashInRange(seed,2,minHeight/2,maxHeight/2);
-	// h += htoit;
+	float h = floatInRange(seed,1,minHeight,maxHeight);
+	// float htoit = hashInRange(seed,2,minHeight/2,maxHeight/2);
 
-    // addGPUOcto(c, c + Vertex(0,0,h), 0xFF, 0xFF, 0x00);
+    // addGPUOcto(c, c + Vertex(0,0,h + htoit), 0xFF, 0xFF, 0x00);
 	Triangle ch = c + Vertex(0,0,h);
 	addGPUTriangle(c[LEFT], c[TOP], c[RIGHT], 0xFF, 0xFF, 0x00);
 	addGPUTriangle(ch[LEFT], ch[TOP], ch[RIGHT], 0xFF, 0xFF, 0x00);
diff --git a/rules/chose.cpp b/rules/chose.cpp
index 2964d0f..1586276 100644
--- a/rules/chose.cpp
+++ b/rules/chose.cpp
@@ -20,29 +20,29 @@ bool Chose::merge() {
     return true;
 }
 
-void Chose::addGPUTriangle(Vertex left, Vertex top, Vertex right, char r, char g, char b) {
+void Chose::addGPUTriangle(Vertex left, Vertex top, Vertex right, unsigned char r, unsigned char g, unsigned char b) {
 	triangles.push_back(new GPUTriangle(left, top, right, r, g, b));
 }
 
-void Chose::addGPUTriangle(Triangle t, char r, char g, char b) {
+void Chose::addGPUTriangle(Triangle t, unsigned char r, unsigned char g, unsigned char b) {
 	addGPUTriangle(t[LEFT], t[TOP], t[RIGHT], r, g, b);
 }
 
-void Chose::addGPUQuad(Vertex ne, Vertex se, Vertex sw, Vertex nw, char r, char g, char b) {
+void Chose::addGPUQuad(Vertex ne, Vertex se, Vertex sw, Vertex nw, unsigned char r, unsigned char g, unsigned char b) {
     this->addGPUTriangle(nw,ne,se,r,g,b);
     this->addGPUTriangle(se,sw,nw,r,g,b);
 }
 
-void Chose::addGPUQuad(Quad q, char r, char g, char b) {
+void Chose::addGPUQuad(Quad q, unsigned char r, unsigned char g, unsigned char b) {
 	addGPUQuad(q[NE], q[SE], q[SW], q[NW], r, g, b);
 }
 
 void Chose::addGPUOcto(Vertex ne, Vertex se, Vertex sw, Vertex nw,
-                    Vertex neh, Vertex seh, Vertex swh, Vertex nwh, char r, char g, char b) {
+                    Vertex neh, Vertex seh, Vertex swh, Vertex nwh, unsigned char r, unsigned char g, unsigned char b) {
 	addGPUOcto(Quad(ne,se,sw,nw), Quad(neh,seh,swh,nwh), r, g, b);
 }
 
-void Chose::addGPUOcto(Quad q, Quad qh, char r, char g, char b) {
+void Chose::addGPUOcto(Quad q, Quad qh, unsigned char r, unsigned char g, unsigned char b) {
     this->addGPUQuad(q[NE], q[SE], q[SW], q[NW], r, g, b);
     this->addGPUQuad(qh[NE], qh[SE], qh[SW], qh[NW], r, g, b);
     for (int i = 0; i < 4; i++)
@@ -139,9 +139,9 @@ void Chose::drawAABB() {
 		Vertex(lod.splitBox[1], lod.splitBox[2], lod.splitBox[5]),
 		Vertex(lod.splitBox[1], lod.splitBox[3], lod.splitBox[5]),
 		Vertex(lod.splitBox[0], lod.splitBox[3], lod.splitBox[5]),
-		hashInRange(seed, 42, 0, 256),
-		hashInRange(seed, 43, 0, 256),
-		hashInRange(seed, 44, 0, 256)
+		hash2(seed, 42) & 255,
+		hash2(seed, 43) & 255,
+		hash2(seed, 44) & 255
 	);
 }
 
diff --git a/rules/chose.hh b/rules/chose.hh
index f74d731..baa0e4b 100644
--- a/rules/chose.hh
+++ b/rules/chose.hh
@@ -41,7 +41,7 @@ class Chose {
 		addEntropy(x1, x2); addEntropy(x3, x4);
 	}
 	inline void addEntropy(Vertex v1) {
-		addEntropy(v1.x, v1.y);
+		addEntropy(float2uint(v1.x), float2uint(v1.y));
 	}
 	inline void addEntropy(Vertex v1, Vertex v2) {
 		addEntropy(v1); addEntropy(v2);
@@ -59,13 +59,15 @@ class Chose {
 		addEntropy(t[LEFT], t[TOP], t[RIGHT]);
 	}
 	void addChild(Chose* c);
-	void addGPUTriangle(GPUTriangle* t);
-	void addGPUTriangle(Vertex left, Vertex top, Vertex right, char r, char g, char b);
-	void addGPUTriangle(Triangle t, char r, char g, char b);
-	void addGPUQuad(Vertex u, Vertex v, Vertex w, Vertex x, char r, char g, char b);
-	void addGPUQuad(Quad q, char r, char g, char b);
-	void addGPUOcto(Vertex a,Vertex b,Vertex c,Vertex d,Vertex e,Vertex f,Vertex g,Vertex h,char red,char green,char blue);
-	void addGPUOcto(Quad q1, Quad q2, char red, char green, char blue);
+
+	void addGPUTriangle(Vertex left, Vertex top, Vertex right, unsigned char r, unsigned char g, unsigned char b);
+	void addGPUTriangle(Triangle t, unsigned char r, unsigned char g, unsigned char b);
+	void addGPUQuad(Vertex ne, Vertex se, Vertex sw, Vertex nw, unsigned char r, unsigned char g, unsigned char b);
+	void addGPUQuad(Quad q, unsigned char r, unsigned char g, unsigned char b);
+	void addGPUOcto(Vertex ne, Vertex se, Vertex sw, Vertex nw,
+			Vertex neh, Vertex seh, Vertex swh, Vertex nwh,
+			unsigned char r, unsigned char g, unsigned char b);
+	void addGPUOcto(Quad q, Quad qh, unsigned char r, unsigned char g, unsigned char b);
 };
 
 #endif
diff --git a/rules/quartier/quartierquadangle.cpp b/rules/quartier/quartierquadangle.cpp
index 49948cc..3f5d404 100644
--- a/rules/quartier/quartierquadangle.cpp
+++ b/rules/quartier/quartierquadangle.cpp
@@ -21,8 +21,8 @@ bool QuartierQuadAngle::split() {
 	for (int i = 0; i < 4; i++) {
 		if (Triangle(c[NW+i], c[NE+i], c[SE+i]).angle() <= Angle::d2r(50)) {
 			// "couper ce coin".
-			Vertex n = Segment(c[NW+i], c[NE+i]).randomPos(seed, 0, 40, 60);
-			Vertex e = Segment(c[NE+i], c[SE+i]).randomPos(seed, 1, 40, 60);
+			Vertex n = Segment(c[NW+i], c[NE+i]).randomPos(seed, 0, 0.4f, 0.6f);
+			Vertex e = Segment(c[NE+i], c[SE+i]).randomPos(seed, 1, 0.4f, 0.6f);
 			Triangle tn = Triangle(n, c[NE+i], c[SE+i]);
 			Triangle te = Triangle(c[NW+i], c[NE+i], e);
 			Quad q;
diff --git a/rules/quartier/quartierquadcarre.cpp b/rules/quartier/quartierquadcarre.cpp
index e4aace2..9033655 100644
--- a/rules/quartier/quartierquadcarre.cpp
+++ b/rules/quartier/quartierquadcarre.cpp
@@ -7,12 +7,12 @@ bool QuartierQuadCarre::split() {
 	Vertex middle[4];
 	Quad q[4];
 
-	Vertex centerN = Segment(c[NW], c[NE]).randomPos(seed, -1, 25, 75);
-	Vertex centerS = Segment(c[SE], c[SW]).randomPos(seed, -2, 25, 75);
-	Vertex center = Segment(centerN, centerS).randomPos(seed, -3, 25, 75);
+	Vertex centerN = Segment(c[NW], c[NE]).randomPos(seed, -1, 0.25, 0.75);
+	Vertex centerS = Segment(c[SE], c[SW]).randomPos(seed, -2, 0.25, 0.75);
+	Vertex center = Segment(centerN, centerS).randomPos(seed, -3, 0.25, 0.75);
 
 	for (int i = 0; i < 4; i++) {
-		middle[N+i] = Segment(c[NW+i], c[NE+i]).randomPos(seed, i, 25, 75);
+		middle[N+i] = Segment(c[NW+i], c[NE+i]).randomPos(seed, i, 0.25, 0.75);
 	}
 	for (int i = 0; i < 4; i++) {
 		q[i] = Quad(c[NE+i], middle[E+i], center, middle[N+i]);
diff --git a/rules/quartier/quartierquadrect.cpp b/rules/quartier/quartierquadrect.cpp
index 13a5a95..3a3f5e5 100644
--- a/rules/quartier/quartierquadrect.cpp
+++ b/rules/quartier/quartierquadrect.cpp
@@ -4,8 +4,8 @@ QuartierQuadRect::QuartierQuadRect(Quad c) : QuartierQuad(c) {
 }
 
 bool QuartierQuadRect::split() {
-	Vertex n = Segment(c[NW], c[NE]).randomPos(seed, 0, 33, 67);
-	Vertex s = Segment(c[SE], c[SW]).randomPos(seed, 1, 33, 67);
+	Vertex n = Segment(c[NW], c[NE]).randomPos(seed, 0, 1/3.f, 2/3.f);
+	Vertex s = Segment(c[SE], c[SW]).randomPos(seed, 1, 1/3.f, 2/3.f);
 
 	Quad qe = Quad(c[NE], c[SE], s, n).inset(W,hrw);
 	Quad qw = Quad(c[SW], c[NW], n, s).inset(W,hrw);
diff --git a/rules/quartier/quartiertri.cpp b/rules/quartier/quartiertri.cpp
index 34f4cf1..6f164b2 100644
--- a/rules/quartier/quartiertri.cpp
+++ b/rules/quartier/quartiertri.cpp
@@ -15,7 +15,7 @@ Chose* QuartierTri::factory(int seed, int n, Triangle c) {
 	if (small && !big) {
 		return new BatimentTri(c);
 	} else if (big) {
-		int choice = hashInRange(seed, n, 0, 3);
+		int choice = hash2(seed, n) % 3;
 		if (choice == 0) {
 			// TODO : condition : générer seulement si les 3 angles sont proches de 60°
 			return new QuartierTriCentre(c);
diff --git a/rules/quartier/quartiertricentre.cpp b/rules/quartier/quartiertricentre.cpp
index 01f7fc1..07c33bd 100644
--- a/rules/quartier/quartiertricentre.cpp
+++ b/rules/quartier/quartiertricentre.cpp
@@ -8,7 +8,7 @@ bool QuartierTriCentre::split() {
 	Vertex center = c.insetLTR(1000).randomPoint(seed, 0);
 	Vertex edgePoint[3];
 	for (int i = 0; i < 3; i++)
-		edgePoint[LEFTSIDE+i] = Segment(c[LEFT+i], c[TOP+i]).randomPos(seed, i+1, 33, 67);
+		edgePoint[LEFTSIDE+i] = Segment(c[LEFT+i], c[TOP+i]).randomPos(seed, i+1, 1/3.f, 2/3.f);
 
 	Quad q[3];
 	for (int i = 0; i < 3; i++) {
diff --git a/rules/quartier/quartiertrihauteur.cpp b/rules/quartier/quartiertrihauteur.cpp
index e99b309..d1b265e 100644
--- a/rules/quartier/quartiertrihauteur.cpp
+++ b/rules/quartier/quartiertrihauteur.cpp
@@ -10,7 +10,7 @@ bool QuartierTriHauteur::split() {
 	// addChild(new RouteTriChaussee(r.cutFrom));
 	// addChild(QuartierTri::factory(seed, 1, r.left);
 	// addChild(QuartierTri::factory(seed, 1, r.right);
-	Vertex baseCenter = Segment(c[LEFT], c[RIGHT]).randomPos(seed, 0, 33, 67);
+	Vertex baseCenter = Segment(c[LEFT], c[RIGHT]).randomPos(seed, 0, 1/3.f, 2/3.f);
 
 	Triangle tl(c[TOP], baseCenter, c[LEFT]);
 	Triangle tr(c[RIGHT], baseCenter, c[TOP]);
diff --git a/rules/quartier/quartiertritrapeze.cpp b/rules/quartier/quartiertritrapeze.cpp
index 600654e..a78c2b5 100644
--- a/rules/quartier/quartiertritrapeze.cpp
+++ b/rules/quartier/quartiertritrapeze.cpp
@@ -5,8 +5,8 @@ QuartierTriTrapeze::QuartierTriTrapeze(Triangle c) : QuartierTri(c) {
 
 bool QuartierTriTrapeze::split() {
 	// TODO : sélectionner le sommet avec l'angle le plus petit.
-	Vertex left = Segment(c[LEFT], c[TOP]).randomPos(seed, 0, 33, 67);
-	Vertex right = Segment(c[RIGHT], c[TOP]).randomPos(seed, 0, 33, 67);
+	Vertex left = Segment(c[LEFT], c[TOP]).randomPos(seed, 0, 1/3.f, 2/3.f);
+	Vertex right = Segment(c[RIGHT], c[TOP]).randomPos(seed, 0, 1/3.f, 2/3.f);
 
 	Triangle ttop(left, c[TOP], right);
 	Quad trapeze(right, c[RIGHT], c[LEFT], left);
diff --git a/rules/route/trottoirquadnormal.cpp b/rules/route/trottoirquadnormal.cpp
index 792f8e5..b1ca0e7 100644
--- a/rules/route/trottoirquadnormal.cpp
+++ b/rules/route/trottoirquadnormal.cpp
@@ -1,6 +1,6 @@
 #include "all_includes.hh"
 
-TrottoirQuadNormal::TrottoirQuadNormal(Quad c, int height) : Chose(), c(c), height(height) {
+TrottoirQuadNormal::TrottoirQuadNormal(Quad c, float height) : Chose(), c(c), height(height) {
 }
 
 void TrottoirQuadNormal::getBoundingBoxPoints() {
diff --git a/rules/route/trottoirquadnormal.hh b/rules/route/trottoirquadnormal.hh
index 254cd6d..eef9919 100644
--- a/rules/route/trottoirquadnormal.hh
+++ b/rules/route/trottoirquadnormal.hh
@@ -6,13 +6,13 @@
 class TrottoirQuadNormal : public Chose {
 	private :
 	Quad c;
-	int height;
+	float height;
 	// TODO : pas besoin de ce champ : il suffit d'orienter
 	// correctement le trottoir lorsqu'on le crée.
 	Cardinal border;
 
 	public :
-	TrottoirQuadNormal(Quad c, int height);
+	TrottoirQuadNormal(Quad c, float height);
 	virtual void triangulation();
 	virtual void getBoundingBoxPoints();
 };
diff --git a/view.cpp b/view.cpp
index a54969a..9b1fef3 100644
--- a/view.cpp
+++ b/view.cpp
@@ -2,16 +2,16 @@
 
 View::View(Chose* root)
 	: root(root),
-	  camera(Camera(Vertex(9600,10000,15300),0,179,1000,0.6)),
+	  camera(Camera(Vertex(9600,10000,15300),0,179,1000,0.6f)),
 	  lod(camera.cameraCenter, root) {
 	initWindow();
 	mainLoop();
 }
 
 void View::setColor(unsigned char r, unsigned char g, unsigned char b) {
-	float red = r/255.f;
-	float green = g/255.f;
-	float blue = b/255.f;
+	float red   = (float)r / 255.f;
+	float green = (float)g / 255.f;
+	float blue  = (float)b / 255.f;
 	float MatDif[4] = {red, green, blue, 1.0f};
 	float MatAmb[4] = {red, green, blue, 1.0f};
 	glMaterialfv(GL_FRONT_AND_BACK,GL_DIFFUSE,MatDif);
@@ -168,8 +168,8 @@ void Camera::setCamera() {
 }
 
 void Camera::mouseMotion(const SDL_MouseMotionEvent &event) {
-	xAngle -= event.xrel*mouseSensitivity;
-	yAngle += event.yrel*mouseSensitivity;
+	xAngle -= (float)(event.xrel) * mouseSensitivity;
+	yAngle += (float)(event.yrel) * mouseSensitivity;
 	xAngle = std::fmod(xAngle + 360, 360);
 	if(yAngle > 179)
 		yAngle = 179;
@@ -225,7 +225,7 @@ void Camera::keyboard(const SDL_KeyboardEvent &eventKey) {
 }
 
 void Camera::animation(int elapsedTime) {
-	float diff = ((float)(elapsedTime+1)/1000.)*(float)moveDist;
+	float diff = ((float)(elapsedTime+1)/1000.f)*(float)moveDist;
 
 	if(up)
 		cameraCenter = cameraCenter + Vertex::fromSpherical(diff, yAngle, xAngle);