f32/d3/vec3.go
func (v Vec3) Dist(v1 Vec3) float32 {
	dx := v1[0] - v[0]
	dy := v1[1] - v[1]
	dz := v1[2] - v[2]
	return math32.Sqrt(dx*dx + dy*dy + dz*dz)
}
func (v Vec3) Dist(v1 Vec3) float32 {
	dx := v1[0] - v[0]
	dy := v1[1] - v[1]
	dz := v1[2] - v[2]
	return math32.Sqrt(dx*dx + dy*dy + dz*dz)
}
// Dist returns the distance between v and v1. d = dist(v, v2)