Im not sure what you mean by the projection, but the bump texture is a JPG image with 512 x 512 resolution, i have tried different sizes like 2048 x 2048 and 1024 x 1024 and 256 x 256, but they only change the shading a bit. But for primitives, the bump map can be seen very clearly. I have also tried to change the Extrude nurbs type to quadrangles with regular grid checked, but no change.