I have a question regarding GeForce4 Ti. Does someone have any idea what GL_DOT_PRODUCT_AFFINE_DEPTH_REPLACE_NV does? This new token seems to be defined in GL_NV_texture_shader3 OpenGL extension, which is available only on GeForce4 Ti series. Does it have something to do with "z-correct bump mapping" mentioned in the recent review at Tom's Hardware? www.tomshardware.com/graphic/02q1/020206/geforce4-03.html