func (v Vec3) SetXYZ(x, y, z float32) {
	v[0] = x
	v[1] = y
	v[2] = z
}
func (v Vec3) SetXYZ(x, y, z float32) {
	v[0] = x
	v[1] = y
	v[2] = z
}
func ( v Vec3 ) SetXYZ ( x , y , z float32 ) { v [ 0 ] = x v [ 1 ] = y v [ 2 ] = z }
// SetXYZ sets the 3 components at once.
SetXYZ sets the 3 components at once .