OK, never mind about this question. I have another one, this one more clear I hope: I have a cube entity, which can rotate. It has a vector which is directed along its local z axis. Now I roll the cube by 45 degrees. The vector is now 45 degrees from the absolute z axis, so the absolute z axis can be discribed as vector*cos(45). How to dexcribe the absolute x, y and z axes if the cube is rotated in 3 dimensions. And another question is how to make the cube then move along this vector?