In the seemingly never-ending quest for more perfect 3D rendering, numerous filtering techniques are used to map an apparent three-dimensional shape into a 2D monitor. Usable anisotropic filtering (AF) is one of the more recent effects to migrate from the digital cinematographer's workstation to the PC, joining bilinear and trilinear filtering, among others (for a complete description of AF, see the next section). Both nVidia and ATI now support this type of filtering in hardware, but each approaches the problem somewhat differently. And that has repercussions both in overall performance and in rendered scene quality.
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