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The mitchell, catmull-rom and sinc filter are legacy filters that were suitable in scanline renderers (such as REYES algorithms) in which sharpening was used to compensate for the blur introduced by the lack of shading samples per pixel. In a path-tracer, every camera ray contributes to shading and renders are crisp by default. Using these sharp sharpening filters in a context of a path-tracer is thus counter productive. Note that these filters need to have filter widths larger than 4 in order to work as designed. The box and triangle filtler are provided for completeness. |
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