646dc7fe4d
Stochastically turn a tricubic filter into a trilinear one. This reduces the number of taps from 64 to 8. It combines ideas from the "Stochastic Texture Filtering" paper and our previous GPU sampling of 3D textures. This is currently only used in a few places where we know stochastic interpolation is valid or close enough in practice. * Principled volume density, color and temperature * Motion blur velocity On an Macbook Pro M3 with the openvdb_smoke.blend regression test and cubic sampling, this gives a ~2x speedup for CPU and ~4x speedup for GPU. However it also increases noise, usually only a little. Equal time renders for this scene show a clear reduction in noise for both CPU and GPU. Note we can probably get a bigger speedup with acceptable noise trade-off using full stochastic sampling, but will investigate that separately. Pull Request: https://projects.blender.org/blender/blender/pulls/132908
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