Rational-Linear Interpolation of Texture Coordinates and Their Partial Derivatives
نویسنده
چکیده
computer graphics, texture mapping, interpolation, texture coordinates, texture derivatives, anti-aliasing This paper describes an algorithm for calculating texture coordinates and their partial derivatives during scan conversion of planar polygons. These values are required in texture mapping for antialiasing algorithms, where a resampling filter combines texture elements (a.k.a. texels) in a weighted average. Perspective projection requires an image warp accomplished with rational-linear (a.k.a. hyperbolic) interpolation. A single division per pixel and a few addition and multiplication operations yields the texture coordinates and their partial derivatives.
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