CompuServe Messages

I understand the zooming issue, but, the turning (for lack of a better word) one is different. If I map the face of a (3D wireframe) building with a bitmap for detail, and if the photograph used for the bitmap was taken straight on, then if I position a camera such that the bitmap is turned relitive to the angle of the starting photograph how much distortion is there? Is this a technique that people use and don't turn the bitmap, or just accept the distortion, or something else? Regarding the "grout" and the blurring, I assume what you are talking about here is a form of blending based on an average of the edge pixals of the two "tiles"? Aside from zooming in and turning, are there other disadvantages of using a photograph for mapping onto surfaces to create detail? Thanks for your help.