How do I translate a camera matrix up/down, left/right so that the translations are always parrallel to the screen, regardless of any other rotations and the like in the world. Like panning in a 3D Modeler Thanks Matt

I have that part down. This is the problem. Say I have a tradition viewpoint, like 0,0,0 looking at 0,0,-10. panning then is simple, simply add whatever the magnituse of the pan is to each vector, then recreate the camera matrix using one of D3DX''s functions. but say I rotate the camera around 0,0,-10, so that instead of the camera position being a simple 0,0,0, it is now 1,1,1, or something thatmakes the D3D x and y axes parrallel to the screen. Then, when trying to do a pan, adding the values to the x and y axes, the sideways pan might not be the logical sideways because the axes in world space are not situated logically in camera space. The pan may go inwards or up, or any other direction based on what other rotations have been made. So I need to be able to pan in the directions that are logical to the user. In other words, I need a set of temporary axes that correspond to the current view, not to the world, on which to pan. Get it?

Translate x by the sin(RotationAngle) * the horizontal movement you want

Translate Y by the actual vertical movement wanted

Translate Z by the cos(RotationAngle) * the horizontal movement you want

Of course this is only for Rotation around the Y axis!

Have you thought of using orthonormalised bases ?

Reg''ds,
sTeVe

I was being relatively stupid. I already had a previous camera look-at matrix; all I had to do was extract the axes from it and step along those.