Process.

Obeying image size is one thing . The pathway chucks up a few more problems along the way which i will attempt to highlight now. As an experiment; I have been mapping the passageway (as described below) and all went well until we hit the lens. The solution came by reversing the process, by projecting a grid on the architecture, taking a picture of it and the taking that back into the compositing software and laying the 3d model over the top. This left use only having to cope with the inherant lens distortion; as the camera lens is far from true.

Using the scan data i had to decide what part of the building was going to be my screen; where all the action was going to take place. I then took a polygon primitive (planar) and lined this up with the area. This gave me the size of the canvas needed for photoshop. After cropping my reference image down to the shot area; i was able to use the distort tool to correct the lens. This was then added as a texture in Maya and layered over the scan data to produce a correct modelling reference.

The pink colour is to differentiate between scan data and the modelled geometry. Awful ain't it!