Materials

color.go

@@ -1,11 +0,0 @@
-package main
-
-type Color interface {
-	GetColor(Vector3) Vector3
-}
-
-var RED = Vector3{255, 0, 0}
-var GREEN = Vector3{0, 255, 0}
-var BLUE = Vector3{0, 0, 255}
-var WHITE = Vector3{255, 255, 255}
-var GREY = Vector3{127, 127, 127}

material.go

@@ -0,0 +1,62 @@
+package main
+
+type Color interface {
+	GetColor(Vector3) Vector3
+}
+
+// Ambre je te copie
+type Material struct {
+	diffuseColor    Color
+	diffuseFac      float64
+	specularColor   Color
+	specularFac     float64
+	specularExp     float64
+	reflectanceFac  float64
+	reflectanceTint Color
+	refractFac      float64
+	refractIndice   float64
+}
+
+func DefaultMaterial(diffuseColor Color) Material {
+	return Material{
+		diffuseColor:    diffuseColor,
+		diffuseFac:      1.0,
+		specularColor:   Vector3{1.0, 1.0, 1.0},
+		specularFac:     0.5,
+		specularExp:     32.0,
+		reflectanceFac:  0.0,
+		reflectanceTint: Vector3{1.0, 1.0, 1.0},
+		refractFac:      0.0,
+		refractIndice:   1.0,
+	}
+}
+
+func MixMat(mat1 Material, mat2 Material, t float64, p Vector3) Material {
+	return Material{
+		mat1.diffuseColor.GetColor(p).Scale(1 - t).Add((mat2.diffuseColor.GetColor(p)).Scale(t)),
+		(mat1.diffuseFac*(1-t) + mat2.diffuseFac) * t,
+		mat1.specularColor.GetColor(p).Scale(1 - t).Add((mat2.specularColor.GetColor(p)).Scale(t)),
+		(mat1.specularFac*(1-t) + mat2.specularFac) * t,
+		(mat1.specularExp*(1-t) + mat2.specularExp) * t,
+		(mat1.reflectanceFac*(1-t) + mat2.reflectanceFac) * t,
+		mat1.reflectanceTint.GetColor(p).Scale(1 - t).Add((mat2.reflectanceTint.GetColor(p)).Scale(t)),
+		(mat1.refractFac*(1-t) + mat2.refractFac) * t,
+		(mat1.refractIndice*(1-t) + mat2.refractIndice) * t,
+	}
+}
+
+// Colors
+
+var RED = Vector3{255, 0, 0}
+var GREEN = Vector3{0, 255, 0}
+var BLUE = Vector3{0, 0, 255}
+var WHITE = Vector3{255, 255, 255}
+var GREY = Vector3{127, 127, 127}
+
+// Materials
+
+var RED_MAT = DefaultMaterial(RED)
+var GREEN_MAT = DefaultMaterial(GREEN)
+var BLUE_MAT = DefaultMaterial(BLUE)
+var WHITE_MAT = DefaultMaterial(WHITE)
+var GREY_MAT = DefaultMaterial(GREY)

primitives_sdf.go

@@ -4,31 +4,31 @@ package main
 type Sphere struct {
 	center   Vector3
 	radius   float64
-	color  Color
+	material Material
 }
 
-func (s Sphere) Distance(p Vector3) (float64, Color) {
+func (s Sphere) Distance(p Vector3) (float64, Material) {
-	return p.Sub(s.center).Length() - s.radius, s.color
+	return p.Sub(s.center).Length() - s.radius, s.material
 }
 
 // Box
 type Box struct {
 	center     Vector3
 	dimensions Vector3
-	color      Color
+	material   Material
 }
 
-func (s Box) Distance(p Vector3) (float64, Color) {
+func (s Box) Distance(p Vector3) (float64, Material) {
 	q := p.Sub(s.center).Abs().Sub(s.dimensions)
-	return q.Max(0.0).Length() + min(max(q.X, max(q.Y, q.Z)), 0.0), s.color
+	return q.Max(0.0).Length() + min(max(q.X, max(q.Y, q.Z)), 0.0), s.material
 }
 
 type Plane struct {
 	normal   Vector3
 	height   float64
-	color  Color
+	material Material
 }
 
-func (s Plane) Distance(p Vector3) (float64, Color) {
+func (s Plane) Distance(p Vector3) (float64, Material) {
-	return p.Dot(s.normal) + s.height, s.color
+	return p.Dot(s.normal) - s.height, s.material
 }

ray_marching.go

@@ -1,5 +1,9 @@
 package main
 
+// RIGHT : x
+// FORWARD : Y
+// UP : Z
+
 import (
 	"math"
 
@@ -13,12 +17,10 @@ const WIDTH = 500
 const HEIGHT = 500
 const PI = math.Pi
 
-// var sphere Sphere = Sphere{Vector3{0, 0, 100}, 10, RED}
+var sphere Sphere = Sphere{Vector3{0, 100, 10}, 10, RED_MAT}
-// var plane Plane = Plane{Vector3{0, 1, 0}, -10, GREY}
+var plane Plane = Plane{Vector3{0, 0, 1}, -10, GREY_MAT}
-// var scene UnionSDF = UnionSDF{sphere, plane}
+var scene UnionSDF = UnionSDF{sphere, plane}
 
-// x right, y forward, z up
-var scene Sphere = Sphere{Vector3{0, 100, 0}, 5, RED}
 var cameraPos Vector3 = Vector3{0, -10, 0}
 
 // radius, theta, phi
@@ -28,11 +30,11 @@ var screenPhysicalSize float64 = 5
 func rayMarch(origin Vector3, direction Vector3) (bool, Vector3) {
 	p := origin
 	for range MAX_STEP {
-		dist, color := scene.Distance(p)
+		dist, mat := scene.Distance(p)
 		// fmt.Println(dist)
 		if dist < EPS {
 			// fmt.Println("hit")
-			return true, color.GetColor(p)
+			return true, mat.diffuseColor.GetColor(p)
 		}
 		if dist > MAX_DIST {
 			break
@@ -58,7 +60,7 @@ func genImage() *rl.Image {
 			sx := screenPhysicalSize * (float64(pixel_x)/WIDTH - 0.5)
 			sy := screenPhysicalSize * (float64(pixel_y)/WIDTH - 0.5)
 
-			origin := screenCenter.Add(theta_vec.Scale(-sx)).Add(phi_vec.Scale(-sy))
+			origin := screenCenter.Add(phi_vec.Scale(-sx)).Add(theta_vec.Scale(sy))
 			direction := (origin.Sub(cameraPos)).Normalized()
 			// fmt.Println(origin, direction)
 
@@ -88,42 +90,3 @@ func main() {
 		rl.EndDrawing()
 	}
 }
-
-// func main() {
-// 	screenWidth := int32(800)
-// 	screenHeight := int32(450)
-
-// 	rl.InitWindow(screenWidth, screenHeight, "Bouncing Ball in Go - raylib")
-// 	defer rl.CloseWindow()
-
-// 	rl.SetTargetFPS(60)
-
-// 	// Ball properties
-// 	ballRadius := float32(20)
-// 	ballPos := rl.NewVector2(float32(screenWidth)/2.0, float32(screenHeight)/2.0)
-// 	ballSpeed := rl.NewVector2(4, 3)
-// 	ballColor := rl.Red
-
-// 	for !rl.WindowShouldClose() {
-// 		// Update
-// 		ballPos.X += ballSpeed.X
-// 		ballPos.Y += ballSpeed.Y
-
-// 		// Bounce on edges
-// 		if ballPos.X >= float32(screenWidth)-ballRadius || ballPos.X <= ballRadius {
-// 			ballSpeed.X *= -1
-// 		}
-// 		if ballPos.Y >= float32(screenHeight)-ballRadius || ballPos.Y <= ballRadius {
-// 			ballSpeed.Y *= -1
-// 		}
-
-// 		// Draw
-// 		rl.BeginDrawing()
-// 		rl.ClearBackground(rl.RayWhite)
-
-// 		rl.DrawText("Bouncing Ball Example", 10, 10, 20, rl.DarkGray)
-// 		rl.DrawCircleV(ballPos, ballRadius, ballColor)
-
-// 		rl.EndDrawing()
-// 	}
-// }

sdf.go

@@ -3,7 +3,7 @@ package main
 import "math"
 
 type SDF interface {
-	Distance(Vector3) (float64, Color)
+	Distance(Vector3) (float64, Material)
 }
 
 func DistanceOnly(sdf SDF, p Vector3) float64 {
@@ -25,7 +25,7 @@ type TranslatedSDF struct {
 	translate Vector3
 }
 
-func (s TranslatedSDF) Distance(p Vector3) (float64, Color) {
+func (s TranslatedSDF) Distance(p Vector3) (float64, Material) {
 	return s.primitive.Distance(p.Sub(s.translate))
 }
 
@@ -35,7 +35,7 @@ type RotatedSDF struct {
 	angle     float64
 }
 
-func (s RotatedSDF) Distance(p Vector3) (float64, Color) {
+func (s RotatedSDF) Distance(p Vector3) (float64, Material) {
 	rotated_p := Rotate(p, s.rotVector, s.angle)
 	return s.primitive.Distance(rotated_p)
 }
@@ -45,7 +45,7 @@ type ScaledSDF struct {
 	scale     float64
 }
 
-func (s ScaledSDF) Distance(p Vector3) (float64, Color) {
+func (s ScaledSDF) Distance(p Vector3) (float64, Material) {
 	dist, color := s.primitive.Distance(p.Scale(1 / s.scale))
 	return dist * s.scale, color
 }
@@ -55,7 +55,7 @@ type RepeatSDF struct {
 	cellSize  Vector3
 }
 
-func (s RepeatSDF) Distance(p Vector3) (float64, Color) {
+func (s RepeatSDF) Distance(p Vector3) (float64, Material) {
 	x, y, z := p.Unpack()
 	sx, sy, sz := s.cellSize.Unpack()
 	round := math.RoundToEven
@@ -68,7 +68,7 @@ type UnionSDF struct {
 	primitive2 SDF
 }
 
-func (s UnionSDF) Distance(p Vector3) (float64, Color) {
+func (s UnionSDF) Distance(p Vector3) (float64, Material) {
 	d1, color1 := s.primitive1.Distance(p)
 	d2, color2 := s.primitive2.Distance(p)
 	d := math.Min(d1, d2)
@@ -85,7 +85,7 @@ type SubstractionSDF struct {
 	primitive2 SDF
 }
 
-func (s SubstractionSDF) Distance(p Vector3) (float64, Color) {
+func (s SubstractionSDF) Distance(p Vector3) (float64, Material) {
 	d1, color1 := s.primitive1.Distance(p)
 	d2, _ := s.primitive2.Distance(p)
 
@@ -98,15 +98,14 @@ type IntersectionSDF struct {
 	primitive2 SDF
 }
 
-func (s IntersectionSDF) Distance(p Vector3) (float64, Color) {
+func (s IntersectionSDF) Distance(p Vector3) (float64, Material) {
 
-	d1, color1 := s.primitive1.Distance(p)
+	d1, mat1 := s.primitive1.Distance(p)
-	d2, color2 := s.primitive2.Distance(p)
+	d2, mat2 := s.primitive2.Distance(p)
-	c1 := color1.GetColor(p)
-	c2 := color2.GetColor(p)
 	d := math.Max(d1, d2)
-	color := c1.Add(c2).Scale(0.5)
+
-	return d, color
+	mat := MixMat(mat1, mat2, 0.5, p)
+	return d, mat
 }
 
 type SmoothUnionSDF struct {
@@ -115,17 +114,15 @@ type SmoothUnionSDF struct {
 	k          float64
 }
 
-func (s SmoothUnionSDF) Distance(p Vector3) (float64, Color) {
+func (s SmoothUnionSDF) Distance(p Vector3) (float64, Material) {
 	k := 4 * s.k
-	d1, color1 := s.primitive1.Distance(p)
+	d1, mat1 := s.primitive1.Distance(p)
-	d2, color2 := s.primitive2.Distance(p)
+	d2, mat2 := s.primitive2.Distance(p)
-	c1 := color1.GetColor(p)
-	c2 := color2.GetColor(p)
 	h := math.Max(k-math.Abs(d1-d2), 0.0)
 	d := math.Min(d1, d2) - h*h*0.25/k
 	t := SmoothStep(d2-d1, -k, k)
-	color := Mix(c1, c2, t)
+	mat := MixMat(mat1, mat2, t, p)
-	return d, color
+	return d, mat
 }
 
 type SmoothSubstractionSDF struct {
@@ -134,17 +131,15 @@ type SmoothSubstractionSDF struct {
 	k          float64
 }
 
-func (s SmoothSubstractionSDF) Distance(p Vector3) (float64, Color) {
+func (s SmoothSubstractionSDF) Distance(p Vector3) (float64, Material) {
 	k := 4 * s.k
-	d1, color1 := s.primitive1.Distance(p)
+	d1, mat1 := s.primitive1.Distance(p)
-	d2, color2 := s.primitive2.Distance(p)
+	d2, mat2 := s.primitive2.Distance(p)
-	c1 := color1.GetColor(p)
-	c2 := color2.GetColor(p)
 	h := math.Max(k-math.Abs(-d1-d2), 0.0)
 	d := math.Max(-d1, d2) + h*h*0.25/k
 	t := SmoothStep(d2-d1, -k, k)
-	color := Mix(c1, c2, t)
+	mat := MixMat(mat1, mat2, t, p)
-	return d, color
+	return d, mat
 }
 
 type SmoothIntersectionSDF struct {
@@ -153,14 +148,12 @@ type SmoothIntersectionSDF struct {
 	k          float64
 }
 
-func (s SmoothIntersectionSDF) Distance(p Vector3) (float64, Color) {
+func (s SmoothIntersectionSDF) Distance(p Vector3) (float64, Material) {
 	k := 4 * s.k
-	d1, color1 := s.primitive1.Distance(p)
+	d1, mat1 := s.primitive1.Distance(p)
-	d2, color2 := s.primitive2.Distance(p)
+	d2, mat2 := s.primitive2.Distance(p)
-	c1 := color1.GetColor(p)
-	c2 := color2.GetColor(p)
 	d := math.Max(k-math.Abs(d1-d2), 0.0)
 	t := SmoothStep(d2-d1, -k, k)
-	color := Mix(c1, c2, t)
+	mat := MixMat(mat1, mat2, t, p)
-	return d, color
+	return d, mat
 }