23dce15f67
This uses Spherical Harmonics to store the indirect lighting and distant lighting visibility. We can then reuse this information for each closure which divide the cost of it by 2 or 3 in many cases, doing the scanning once. The storage cost is higher than previous method, so we split the resolution scaling to be independant of raytracing. The spatial filtering has been split to its own pass for performance reason. Upsampling now only uses 4 bilinearly interpolated samples (instead of 9) using bilateral weights to avoid bleeding. This also add a missing dot product (which soften the lighting around corners) and fixes the blocky artifacts seen at lower resolution. Pull Request: https://projects.blender.org/blender/blender/pulls/118924
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