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
}

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
}