I'm up to the neck in projective transforms and I'm losing my mind. So here's the problem:

I've taken a photo of a scene. I need to work out the projection transformation matrix that distorts the image so that it approximates how the scene would look from another camera position. I'm guessing I need to calculate the camera transform from the original to the new position, then use the equations on the wiki page  http://en.wikipedia.org/wiki/3D_projection to calculate the matrix.

Does this sound about right?

Cheers,

Rob