ray

type Intersection struct {
	Point     *maths.Vec3
	Incoming  *Ray
	Material  int
	Distance  float64
	U, V      float64
	Normal    *maths.Vec3
	SurfaceOx *maths.Vec3
	SurfaceOy *maths.Vec3
}

type Ray struct {
	Start     maths.Vec3
	Direction maths.Vec3
	Depth     int
	Inverse   [3]float64
}