Weizhen Huang bb689687a7 Fix #140892: Cycles: equiangular sampling numerical issue
When `delta` is significantly larger than the difference between `tmin`
and `tmax`, the precision of `theta_a` and `theta_b` reduces, resulting
in banding artefacts.

For equiangular sampling, we use uniform sampling to fix this case.

For light tree, we use the equality
atan(a) + atan(b) = atan2(a + b, 1 - a*b).

Pull Request: https://projects.blender.org/blender/blender/pulls/142845
2025-07-23 12:56:11 +02:00
2025-07-22 11:59:43 +10:00
2023-12-08 13:28:13 +11:00
2025-05-12 11:34:32 +02:00
2025-07-10 12:48:33 +10:00
2025-07-22 16:17:10 +10:00

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