Problems encountered.

As an experiment one of our tutors suggested i use the projector in the studio to project onto a model made of basic polygons.
The first thing i done is plotted the position of the projector in world space, and the difference in elevation etc; compared to my model.
This all went well until i projected the object back onto its self. I found that i did not know the exact angle that the 'in situ' projector was set at; and therefore when it projected back it gave a distorted image. Without knowing the projector is true and square i am unable to get a true result.

Also the ratio has to be governed by the projector back through the software right to the camera in Maya.
I am going to put this down to experimental time; and revert to using a smaller projector which i can set up squarely.

The solution to the problem would have been to measure to the centre of the lens and then measure the centre of the projection; making sure that the two centres are at the same  height, this way you could make sure the projected image is true. So for the side of a building a scaffold is going to be needed. This was not time wasted; far from it, it just shows the setting up needed to get the result right. Also when we move onto bigger subjects, these experiments will become invaluable.