Shadow catcher receive shadows even if there is no light in the scene #69410
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Reference: blender/blender#69410
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System Information
Operating system: Windows
Graphics card: GeForce GTX 1080 Ti
system-info.txt
Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash:
f6cb5f5449
, type: build date: 2019-07-29, 09:44 AMWorked: -
Short description of error
See my attached .blend file for an example and the screenshot for additional infos.
If you set the light object power to "0", then the shadow catcher object receives shadows. But there is no light in the scene.
I've set the world light to "0" too. This should not happen.
Exact steps for others to reproduce the error
Do I misunderstand something when using the shadows catcher or is this an error?
shadowcatcher_problem01.blend
Added subscriber: @ChristophWerner
Added subscriber: @MarcinTwarowski
This comment was removed by @MarcinTwarowski
Added subscribers: @Sergey, @lichtwerk
Changed status from 'Needs Triage' to: 'Confirmed'
Although a bit on shaky ground here, but I would kind of confirm this issue.
Relevant commits:
d14e39622a
bd069a89aa
For absolutely no light (
path_total == 0.0f
),bd069a89aa
changed behavior from returning 1.0f to returningL->shadow_transparency
(see what is nowpath_radiance_sum_shadowcatcher
).Since above commit was only intended to fix problems with transparent shadow casters, but also changed the behavior for opaque shadow casters in the case of no light, I would assume this can somehow be fixed and was not intended, @Sergey?
(to me it would make more snese to actually have no shadow in the case of no light -- so agree with the report, but will leave up to @Sergey to decide.... confirming for now though...)
Sidenote: there are all sorts of (other) improvements to make, so if this turns out to be a known limitation for now, maybe this can be considered elswhere:
https://devtalk.blender.org/t/lets-finally-fix-the-shadowcatcher/691
#71253 (Cycles shadow catcher improvements)
Exactly. I repeat it for better understanding:
If there is no world light set (environment light strength is set to 0 )
and there is no light object set or all light objects are set to power of 0 then no shadows should be seen on any shadow catchers.
For me this is often a problem, when I work with render passes.
Thank you for the attention
Chris
Added subscriber: @brecht
Changed status from 'Confirmed' to: 'Archived'
The rewritten shadow catcher in Blender 3.0 does not have this problem anymore.