Regression: Shadow always produces black image on baking #107777
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Reference: blender/blender#107777
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System Information
Operating system: Windows 11, 22H2 (Build 22621.1555)
Graphics card: RTX 3080 Mobile (laptop version)
Blender Version
Broken: version: 3.5.0 Alpha, branch: master, commit date: 2022-12-08 02:10, hash:
rB04693f90748eWorked: version: 3.5.0 Alpha, branch: master, commit date: 2022-12-05 01:58, hash:
rB9cb061f4f011This broke with the removal of the Shadow Pass in
0731d78d00Short description of error
Baking textures with Bake Type set to Shadow always produces Black Transparent texture
Exact steps for others to reproduce the error
Expected result - Shadow texture contains a shadow from a cube
Actual result - Shadow texture contains zeros on all channels
All with the same result
Changing Render device from GPU Compute to CPU doesn't fix the problem
Bake Type: Shadow always produces black imageto Regression: Shadow always produces black image on bakingAt the time of the bug, there were many commits associated with cycles. Not sure if I can guess who the culprit is.
Will check.
This broke with the removal of the Shadow Pass in
0731d78d00Compared to the pass [which has the alternative of the shadow catcher] I havent checked how/if this can be baked properly @sergey ?
@brecht : since this is non, funtional, it should also be removed from the
bake_typeEnumProperty? If we do that (and happen to open files with thisbake_typeset), then just set it to "Combined" indo_version?Similar to #106482 btw.
#106482 mentions use "shadow catcher" passes, but they are not available when baking. I agree that this is a pretty specific case, but it was in Blender forever, and if there is no way to solve shadow-only baking using alternative ways in Blender, it would be a huge loss
Still havent checked (sorry, looking into another issue atm.), but maybe there is a way to bake a shadow catcher with one of the other bake types to get the desired result?
Unfortunately, it doesn't seem possible - I have spent more than three days trying to find a workaround using other bake types, shader nodes and post-processing tricks. As far as I can tell right now - nothing can replace pure "Shadow" type - it will contain unnecessary information like lighting, shading, or AO. No amount of filters or post-processing can get close to this type in terms of quality and "separation" between actual shadows and other shading "parts". "Shadow" type is pretty unique in a sense that it really only captures the shadows and nothing else.
If there would be a way to simulate this baking using Shadow Catcher (because this bake type is pretty much just a shadow catcher), that would definitely solve it
I have temporarily solved the issue by downgrading to 3.4.1 and will probably take a look at it myself a bit later, because I cannot really imagine how Blender will continue the development without this insanely important feature
I think the solution here is to add support for baking the shadow catcher pass.