No center, just translated

src/primitives_sdf.go

@@ -2,34 +2,31 @@ package main
 
 // Sphere
 type Sphere struct {
-	center   Vector3
 	radius   float64
 	material Material
 }
 
 func (s Sphere) Distance(p Vector3) (float64, Material) {
-	return p.Sub(s.center).Length() - s.radius, s.material
+	return p.Length() - s.radius, s.material
 }
 
 // Box
 type Box struct {
-	center     Vector3
 	dimensions Vector3
 	material   Material
 }
 
 func (s Box) Distance(p Vector3) (float64, Material) {
-	q := p.Sub(s.center).Abs().Sub(s.dimensions)
+	q := p.Abs().Sub(s.dimensions)
 	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
 	material Material
 }
 
 func (s Plane) Distance(p Vector3) (float64, Material) {
-	return p.Dot(s.normal) - s.height, s.material
+	return p.Dot(s.normal), s.material
 }

src/ray_marching.go

@@ -34,8 +34,8 @@ func init() {
 
 	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}
+	sphere := TranslatedSDF{Sphere{10, sphereMat}, Vector3{0, 100, 5}}
+	plane := Plane{Vector3{0, 0, 1}, WHITE_GREY_GRID_MAT}
 
 	scene = SmoothUnionSDF{sphere, plane, 2}