diff --git a/README.md b/README.md
new file mode 100644
index 0000000..4a7f52e
--- /dev/null
+++ b/README.md
@@ -0,0 +1,2 @@
+Simple cpu ray-marching in go
+Focus on Lisiblity & Features, sacrifice performance
diff --git a/go.mod b/src/go.mod
similarity index 100%
rename from go.mod
rename to src/go.mod
diff --git a/go.sum b/src/go.sum
similarity index 100%
rename from go.sum
rename to src/go.sum
diff --git a/material.go b/src/material.go
similarity index 78%
rename from material.go
rename to src/material.go
index d38b89e..e821a0e 100644
--- a/material.go
+++ b/src/material.go
@@ -43,10 +43,10 @@ func DefaultMaterial(diffuseColor Color) Material {
 		diffuseColor:    diffuseColor,
 		diffuseFac:      1,
 		specularColor:   Vector3{255, 255, 255},
-		specularFac:     2,
+		specularFac:     1,
 		specularExp:     35.0,
 		reflectanceFac:  0.0,
-		reflectanceTint: Vector3{1.0, 1.0, 1.0},
+		reflectanceTint: Vector3{255, 255, 255},
 		refractFac:      0.0,
 		refractIndice:   1.0,
 	}
@@ -67,32 +67,6 @@ func MixMat(mat1 Material, mat2 Material, t float64, p Vector3) Material {
 	}
 }
 
-// Setters
-
-func ChangeAmbiantColor(m *Material, newAmbiantColor Color) {
-	m.ambiantColor = newAmbiantColor
-}
-
-func ChangeDiffuseColor(m *Material, newDiffuseColor Color) {
-	m.diffuseColor = newDiffuseColor
-}
-
-func ChangeSpecularColor(m *Material, newSpecularColor Color) {
-	m.specularColor = newSpecularColor
-}
-
-func ChangeDiffuseFac(m *Material, newDiffuseFac float64) {
-	m.diffuseFac = newDiffuseFac
-}
-
-func ChangeSpecularFac(m *Material, newSpecularFac float64) {
-	m.specularFac = newSpecularFac
-}
-
-func ChangeSpecularExp(m *Material, newSpecularExp float64) {
-	m.specularExp = newSpecularExp
-}
-
 // Colors
 
 var RED = Vector3{255, 0, 0}
diff --git a/primitives_sdf.go b/src/primitives_sdf.go
similarity index 87%
rename from primitives_sdf.go
rename to src/primitives_sdf.go
index cab42e7..12d30f1 100644
--- a/primitives_sdf.go
+++ b/src/primitives_sdf.go
@@ -4,11 +4,11 @@ package main
 type Sphere struct {
 	center   Vector3
 	radius   float64
-	material *Material
+	material Material
 }
 
 func (s Sphere) Distance(p Vector3) (float64, Material) {
-	return p.Sub(s.center).Length() - s.radius, *s.material
+	return p.Sub(s.center).Length() - s.radius, s.material
 }
 
 // Box
@@ -23,6 +23,7 @@ func (s Box) Distance(p Vector3) (float64, Material) {
 	return q.Max(0.0).Length() + min(max(q.X, max(q.Y, q.Z)), 0.0), s.material
 }
 
+// Plane
 type Plane struct {
 	normal   Vector3
 	height   float64
diff --git a/ray_marching.go b/src/ray_marching.go
similarity index 74%
rename from ray_marching.go
rename to src/ray_marching.go
index e752f35..17d36e2 100644
--- a/ray_marching.go
+++ b/src/ray_marching.go
@@ -17,18 +17,29 @@ const WIDTH = 500
 const HEIGHT = 500
 const PI = math.Pi
 
-var sphereMat = RED_MAT
-var lightPos = Vector3{0, -200, 800}
-var sphere = Sphere{Vector3{0, 100, 5}, 10, &sphereMat}
-var plane = Plane{Vector3{0, 0, 1}, 0, WHITE_GREY_GRID_MAT}
-
-// var scene UnionSDF = UnionSDF{sphere, plane}
-var scene = SmoothUnionSDF{sphere, plane, 2}
-var cameraPos Vector3 = Vector3{0, -10, 30}
+var lightPos Vector3
+var scene SmoothUnionSDF
 
 // radius, theta, phi
-var screenSpherical Vector3 = Vector3{10, PI/2 + 0.2, PI / 2}
-var screenPhysicalSize float64 = 5
+var screenSpherical Vector3
+var screenPhysicalSize float64
+var cameraPos Vector3
+
+func init() {
+	lightPos = Vector3{0, -200, 800}
+
+	cameraPos = Vector3{0, -10, 30}
+	screenSpherical = Vector3{10, PI/2 + 0.2, PI / 2}
+	screenPhysicalSize = 5
+
+	sphereMat := RED_MAT
+	sphereMat.specularFac = 0.5
+	sphere := Sphere{Vector3{0, 100, 5}, 10, sphereMat}
+	plane := Plane{Vector3{0, 0, 1}, 0, WHITE_GREY_GRID_MAT}
+
+	scene = SmoothUnionSDF{sphere, plane, 2}
+
+}
 
 func phongShading(point Vector3, normal Vector3, mat Material) Vector3 {
 	lightVec := (lightPos.Sub(point)).Normalized()
@@ -49,20 +60,14 @@ func rayMarch(origin Vector3, direction Vector3) (bool, Vector3) {
 	p := origin
 	for range MAX_STEP {
 		dist, mat := scene.Distance(p)
-		// fmt.Println(dist)
 		if dist < EPS {
-			// fmt.Println("hit")
 			normal := Gradient(scene, p, EPS).Normalized()
 			return true, phongShading(p, normal, mat)
 		}
 		if dist > MAX_DIST {
 			break
 		}
-		// fmt.Println("Before")
-		// fmt.Println(p, dist)
 		p = p.Add(direction.Scale(dist))
-		// fmt.Println("After")
-		// fmt.Println(p, DistanceOnly(scene, p))
 	}
 	return false, GREY
 }
@@ -70,7 +75,6 @@ func rayMarch(origin Vector3, direction Vector3) (bool, Vector3) {
 func genImage() *rl.Image {
 	screenCartesian, _, theta_vec, phi_vec := screenSpherical.SphericalToCartesian()
 	screenCenter := cameraPos.Add(screenCartesian)
-	// fmt.Println(theta_vec, phi_vec)
 
 	image := rl.GenImageColor(WIDTH, HEIGHT, rl.Black)
 
@@ -81,7 +85,6 @@ func genImage() *rl.Image {
 
 			origin := screenCenter.Add(phi_vec.Scale(-sx)).Add(theta_vec.Scale(sy))
 			direction := (origin.Sub(cameraPos)).Normalized()
-			// fmt.Println(origin, direction)
 
 			hit, color_vec := rayMarch(origin, direction)
 			var fr, fg, fb float64
@@ -100,10 +103,6 @@ func genImage() *rl.Image {
 }
 
 func main() {
-	// ChangeDiffuseColor(&sphereMat, Vector3{0, 0, 255})
-	ChangeSpecularFac(&sphereMat, 0.5)
-	ChangeSpecularExp(&sphereMat, 20)
-	// ChangeSpecularColor(&sphereMat, Vector3{0, 0, 255})
 	rl.InitWindow(WIDTH, HEIGHT, "raymarching")
 	texture := rl.LoadTextureFromImage(genImage())
 
diff --git a/sdf.go b/src/sdf.go
similarity index 100%
rename from sdf.go
rename to src/sdf.go
diff --git a/vec3.go b/src/vec3.go
similarity index 100%
rename from vec3.go
rename to src/vec3.go