find the cross product of those two matrices? im not sure i understand your equation though. I thought cross product is done between vectors and the way you typed A and B doesn't make sense. are the stuff in () columns or rows? a matrix is a 'grid' of numbers like Code: 3 5 6 4 4 4 1 2 2 the cross product of two vectors gives you the vector that's perpendicular to the two vectors... 2a is trivial, you can look on the internet for what the rotation matrix is. (wikipedia has such info) once you've done that and told us what you've found then someone could give you an example on how to resolve 2b Is 2a something along the line like this R = cos(45degrees) -sin(45degrees) sin (45degrees) cos(45degrees) At ctbram and elephantinc are the methods and answers you both give me the same but in different concept of how you work them out ??? Thnask again guys for taking time for my annoyance.....promise to post something maya up within the next few weeks