diff --git a/material.go b/material.go
index d9e7837..f78f30f 100644
--- a/material.go
+++ b/material.go
@@ -1,9 +1,28 @@
 package main
 
+import "math"
+
 type Color interface {
 	GetColor(Vector3) Vector3
 }
 
+type GridColor struct {
+	color1 Color
+	color2 Color
+	size   float64
+}
+
+func (grid GridColor) GetColor(p Vector3) Vector3 {
+	ix := int(math.Floor(p.X / grid.size))
+	iy := int(math.Floor(p.Y / grid.size))
+	iz := int(math.Floor(p.Z / grid.size))
+
+	if (ix+iy+iz)%2 == 0 {
+		return grid.color1.GetColor(p)
+	}
+	return grid.color2.GetColor(p)
+}
+
 // Ambre je te copie
 type Material struct {
 	ambiantColor    Color
@@ -56,6 +75,11 @@ var BLUE = Vector3{0, 0, 255}
 var WHITE = Vector3{255, 255, 255}
 var GREY = Vector3{127, 127, 127}
 
+var WHITE_GREY_GRID = GridColor{WHITE, GREY, 5}
+var RED_BLUE_GRID = GridColor{RED, BLUE, 5}
+
+var GRID_OF_GRID = GridColor{WHITE_GREY_GRID, RED_BLUE_GRID, 10}
+
 // Materials
 
 var RED_MAT = DefaultMaterial(RED)
@@ -63,3 +87,6 @@ var GREEN_MAT = DefaultMaterial(GREEN)
 var BLUE_MAT = DefaultMaterial(BLUE)
 var WHITE_MAT = DefaultMaterial(WHITE)
 var GREY_MAT = DefaultMaterial(GREY)
+
+var WHITE_GREY_GRID_MAT = DefaultMaterial(WHITE_GREY_GRID)
+var GRID_OF_GRID_MAT = DefaultMaterial(GRID_OF_GRID)
diff --git a/ray_marching.go b/ray_marching.go
index 551d67f..e1b3f47 100644
--- a/ray_marching.go
+++ b/ray_marching.go
@@ -18,8 +18,8 @@ const HEIGHT = 500
 const PI = math.Pi
 
 var lightPos Vector3 = Vector3{0, 200, 400}
-var sphere Sphere = Sphere{Vector3{0, 100, 10}, 10, RED_MAT}
-var plane Plane = Plane{Vector3{0, 0, 1}, -10, GREY_MAT}
+var sphere Sphere = Sphere{Vector3{0, 100, 10}, 10, WHITE_GREY_GRID_MAT}
+var plane Plane = Plane{Vector3{0, 0, 1}, -10, GRID_OF_GRID_MAT}
 var scene UnionSDF = UnionSDF{sphere, plane}
 
 var cameraPos Vector3 = Vector3{0, -10, 0}