Cycles GPU + Light tree: Sun sampling does not work under certain conditions #110255
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Reference: blender/blender#110255
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System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 4090/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 531.79
System Information
Operating system: macOS-13.4.1-arm64-arm-64bit 64 Bits
Graphics card: Metal API Apple M1 Pro 1.2
System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: Intel(R) Arc(TM) A750 Graphics Intel 4.6.0 - Build 31.0.101.4502
Blender Version
Broken version: 4.0.0 Alpha, branch: main, commit date: 2023-07-19 01:26, hash:
c3bf00cd2d3a
Broken version: 3.6
Broken version: 3.5
Worked: Prior to the addition of the light tree
Short description of error
When using a GPU backend for Cycles, sun lights with small angles (E.G. Between
0
degrees and0.01
degrees), at certain rotations, with light trees enabled, won't be sampled.I can reproduce this issue on a Nvidia GPU with CUDA and OptiX, an Apple GPU with Metal, and a Intel GPU with oneAPI. CPU is fine, and I don't have a AMD GPU to test HIP.
Warning, video contains flickering:
Exact steps for others to reproduce the error
Angle
of the sun lightI can confirm
Pratik Borhade referenced this issue2023-08-07 07:43:10 +02:00