Fully transparent material creates light bounces #90734
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Reference: blender/blender#90734
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System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 471.68
Blender Version
Broken: version: 2.93.2, branch: master, commit date: 2021-08-03 05:58, hash:
1eb06de260
Short description of error
After creating an area light and placing a fully transparent bsdf plane/box behind it the transparent object seems to increase the amount of light, hence I think light bounces off it.
Exact steps for others to reproduce the error
transparency_and_area_lights.blend The intensity of light on the floor plane is stronger with the transparent bsdf box is placed behind the light source. I animated the box to make the effect more clear.
Added subscriber: @Zoni
Added subscriber: @lichtwerk
Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'
Seems this is happening with all types of light?
There was a similar report (#90455), but on second sight, this does not seem related.
I am a bit on shaky ground, but would also not expect this, https://docs.blender.org/manual/en/latest/render/cycles/render_settings/light_paths.html#transparency also does not give a hint at this being expected behavior.
I think a rendering dev would need to comment here.
Fully transparent material creates light bounces when using area lightsto Fully transparent material creates light bouncesChanged status from 'Needs Developer To Reproduce' to: 'Confirmed'
Added subscriber: @Sergey
Acccording to @Sergey, this is only an issue in master, Cycles-X seems fine in this regard.
But will confirm then for master.
Added subscriber: @SteffenD
This issue was referenced by blender/cycles@5db8d93df3
This issue was referenced by
0803119725
Changed status from 'Confirmed' to: 'Resolved'