clean up

src/primitives_sdf.go

@@ -0,0 +1,35 @@
+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
+}
+
+// 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)
+	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
+}