Blender 3.0 Shadow Catcher Noticeably Slower Than 2.93 #93324
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Reference: blender/blender#93324
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System Information
Operating system: Windows-10-10.0.19042-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 496.76
Blender Version
Broken: version: 3.0.0 Beta, branch: master, commit date: 2021-11-05 22:17, hash:
7a5b8cb202Worked: 2.93
Short description of error
Rendering shadow catchers in 3.0 is slower than 2.93.
Rendered on a Ryzen 3950x
2.93 24.66s
3.0 42.37s
Exact steps for others to reproduce the error
Use my blend file, render in 2.93, then render in 3.0. compare times.
shadow_catcher_slow.blend
Added subscriber: @derekbarker
Added subscriber: @juang3d
I tested this and I can confirm, no matter how 2.93 is always fasgter than 3.0 in these situations.
Added subscriber: @Johan-Basberg
Same for MacBook Pro (Intel), 3.0.0b was 69% slower - and used 11 times more memory.
Using the provided file, rendering just after opening file.
Changing 3.0 to GPU Compute changed time to 01:37.61. hehe
The rendering process looks very different in 3.0; none of those small squares showing what part is being rendered. I guess this is seen as an improvement - that the entire image is immediately ready, and then render quality and detail is just improved over time?
This was on a MacBook Pro 2019:
Added subscriber: @brecht
Changed status from 'Needs Triage' to: 'Archived'
This is known, handling indirect light is significantly more expensive to render.
There may be ways to optimize this further, but it's not considered a bug.
Is there any way for a user to get the previous results the shadow catcher used to have? This change single handedly doubled our render farm costs without giving us anything worth 2x the cost. It would be a horrible shame to have to stick to 2.93 because of this.
There's no way to get the same results as the old shadow catcher. Some optimizations may be possible by giving the shadow catcher objects simpler materials or setting up shader nodes so they are black for indirect light.
In my tests with a few benchmark scenes, making the ground/walls shadow catchers is adding 10-20% to the render time. In the attached .blend file, if you replace that cube with an character with hair and skin, the relative cost of the shadow catcher is going to be much lower also. This really depends on the scene though. In general the new shadow catcher requires tracing additional paths in a scene that consists of just the shadow catcher objects, which are often much simpler than the rest of the scene, but not always.
It would be useful to understand the kind of shots you are rendering where the impact is actually 2x the render time, to see if we can optimize those cases.
Potentially we could add an option to ignore indirect light with the new shadow catcher for 3.1, though not sure yet how well it fits or how much that would actually reduce render time.
Well I cant share any details about our scenes here but if you PM me on blender.chat I can give you some details if you are interested.