1284e98ab86c5a71a45412ece975e7fca95ca73d
based on concentric disk mapping. Concentric disk mapping was already present, but not used everywhere. Now `sample_cos_hemisphere()`, `sample_uniform_hemisphere()`, and `sample_uniform_cone()` use concentric disk mapping. This changes the noise in many test images. Pull Request: https://projects.blender.org/blender/blender/pulls/109774
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