Area Light Leave light border traces on surfaces (less noticable on CPU) #98930
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Reference: blender/blender#98930
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System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.59
Blender Version
Broken: version: 3.2.0 Beta, branch: master, commit date: 2022-05-26 13:12, hash:
bf53956914Broken: 3.1, 3.0
Worked: never?
Short description of error
Area light leaves visible trailing light on wide surfaces
Exact steps for others to reproduce the error
Area light trails_render.blend
1.open Blender
2.add a plane scale it by 30
3.change point light to area light
Added subscriber: @Roggii-4
Added subscriber: @lichtwerk
Changed status from 'Needs Triage' to: 'Needs User Info'
Seems I cannot repro here.
Can you share you example file (saved exactly in the view you made the screenshot from)?
Sure....Area light trails_render.blend
Changed status from 'Needs User Info' to: 'Needs Triage'
Changed status from 'Needs Triage' to: 'Confirmed'
OK, can confirm.
Seems to be more prominent with GPU (but also apparent on CPU).
This was fine in 2.93 (probably came with CyclesX)
Sorry, made a mistake (GPU was disabled when testing 2.93 -- it is actually also the case there)
Area Light Leave light border traces on surfacesto Area Light Leave light border traces on surfaces (less noticable on CPU)Could be the same as #69535?
Can still reproduce in current
main.I'm pretty sure that it is, yes - or at least very similar. Both are caused by numerical issues in the spherical quad sampling code.