A comparative analysis system allows independent management of definition of dimensional members of a multi-dimensional model. A source gas is introduced at an entrance opening, while a vacuum source is connected at an exit opening. When the film is intermittently stopped in the projector’s film gate, the registration reference mark is read to determine the location of that frame relative to the immediately preceding frame. The resulting texture coordinate displacements are provided to texture mapping hardware that performs a texture mapping operation providing texture combining in one pass.