Hopefully before really raymarching testing

primitives_sdf.go

@@ -0,0 +1,34 @@
+package main
+
+// Sphere
+type Sphere struct {
+	center Vector3
+	radius float64
+	color  Color
+}
+
+func (s Sphere) Distance(p Vector3) (float64, Color) {
+	return p.Sub(s.center).Length(), s.color
+}
+
+// Box
+type Box struct {
+	center     Vector3
+	dimensions Vector3
+	color      Color
+}
+
+func (s Box) Distance(p Vector3) (float64, Color) {
+	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
+}
+
+type Plane struct {
+	normal Vector3
+	height float64
+	color  Color
+}
+
+func (s Plane) Distance(p Vector3) (float64, Color) {
+	return p.Dot(s.normal) + s.height, s.color
+}