Crizomb/RayMarchingGo
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Phong shading

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This commit is contained in:
Crizomb 2025-09-26 21:43:08 +02:00
parent f5d4a5cb7e
commit 9e8028f904
2 changed files with 24 additions and 3 deletions
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20
ray_marching.go
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@ -17,6 +17,7 @@ const WIDTH = 500
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 scene UnionSDF = UnionSDF{sphere, plane}
@ -27,6 +28,22 @@ var cameraPos Vector3 = Vector3{0, -10, 0}
var screenSpherical Vector3 = Vector3{10, PI / 2, PI / 2}
var screenPhysicalSize float64 = 5
func phongShading(point Vector3, normal Vector3, mat Material) Vector3 {
lightVec := (lightPos.Sub(point)).Normalized()
reflectLight := Reflect(lightVec, normal)
eyeVec := (cameraPos.Sub(point)).Normalized()
ambiant := mat.ambiantColor.GetColor(point).Scale(0.1)
diffusePower := mat.diffuseFac * max(0, normal.Dot(lightVec)) * 0.5
diffuse := mat.diffuseColor.GetColor(point).Scale(diffusePower)
specularPower := mat.specularFac * math.Pow(max(0, reflectLight.Dot(eyeVec)), mat.specularExp)
specular := mat.specularColor.GetColor(point).Scale(specularPower)
return ambiant.Add(diffuse).Add(specular)
}
func rayMarch(origin Vector3, direction Vector3) (bool, Vector3) {
p := origin
for range MAX_STEP {
@ -34,7 +51,8 @@ func rayMarch(origin Vector3, direction Vector3) (bool, Vector3) {
// fmt.Println(dist)
if dist < EPS {
// fmt.Println("hit")
return true, mat.diffuseColor.GetColor(p)
normal := Gradient(scene, p, EPS).Normalized()
return true, phongShading(p, normal, mat)
}
if dist > MAX_DIST {
break