Overlapping shadows of MNEE Caustics and filter glossy caustics produce incorrect result #97932
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Reference: blender/blender#97932
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System Information:
Operating system: Linux-5.17.0-1-amd64-x86_64-with-glibc2.33 64 Bits
Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 510.68.02
Blender Version:
Broken: version: 3.3.0 Alpha, branch: master, commit date: 2022-05-06 21:48, hash:
98a04ed452
Worked: NA as this issue is probably in all builds of Blender with MNEE
Short description of error:
When the shadows of an
Shadow Caustic
light and a normal light overlap and filter glossy is set higher than 0, then the caustics produced in this overlapping area by the normal light will be rendered partially with the set filter glossy setting and partially with a filter glossy of 0.Here is some images demonstrating the issue (The file I used for testing is attached below):
Exact steps for others to reproduce the error:
Shadow Caustic
option is NOT enabled.Shadow Caustic
option enabled.Shadow Caustic
option enabled so it has only a small impact on the final render. (Note: The power of the light must be above 0 for this to work) - This step is not necessary, but it makes it much easier to see what's happening.Shadow Caustic
light excluded from the final render. Notice how there was an impact on the shadow and caustics produced by the non-Shadow Caustic
light.Here is a .blend file with steps 1-6 done for you:
#97932 - Overlapping Caustic Shadows issue.blend
The steps for testing with the file is as follows:
MNEE Light
from the final render and render again, comparing the result to the first render you did.Added subscriber: @Alaska
Overlapping shadows of MNEE Caustics and filter glossy caustics produce errorsto Overlapping shadows of MNEE Caustics and filter glossy caustics produce incorrect resultChanged status from 'Needs Triage' to: 'Confirmed'
Added subscribers: @PratikPB2123, @olivier.fx
Added subscribers: @Christophe-Hery, @brecht
Thanks @Alaska. As I understand it, this is an inherent problem due to the combination of:
The Filter Glossy feature blurs bsdfs indiscriminately at the cost of bias, which we need to disable for any point in the shadow of a caustic light in order to support true selective caustics. I will think about it more but that seems like challenging limitation to lift unless you disable Filter Glossy. Please let me know what you think.
cc @Christophe-Hery @brecht
I've been thinking about this for a while but still can't see an obvious solution..
Will not consider this a blocker for the 3.2 release even if it would be good to solve.
Added subscriber: @sherholz
Adding @sherholz.