Adaptive subdivision modifier takes to much memory #73564
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Reference: blender/blender#73564
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System Information
Operating system: Win Version 10.0.18362 Build 18362
Graphics card: dual GTX 1080 ti
Blender Version
Broken: 2.83.1
Worked: (optional)
Short description of error
Adaptive subdivision modifier takes way to much memory
Exact steps for others to reproduce the error
was playing with the Adaptive subdivision modifier and was trying out different values in offscreen and max subdivisions scale under render properties when all of a sudden this scene now wants 87 Gb of memory when rendering.
Even if I take away the modifier completely it still wants 87 Gb of memory when rendering. Something happened..
Before I made the above changes I had 6 copies of the cylinder far in the background, they where rendered but did not take more than 8 Gb in total. They where deleted before changes in properties.
treelog.blend
Added subscriber: @mrTorb
#102535 was marked as duplicate of this issue
#100915 was marked as duplicate of this issue
Added subscriber: @EAW
Notes for a more experienced triager:
Hitting
F12
to render will cause a crash. However, just having the 'bark' material in the shader editor will lead to a crash in under a minute, even in 'solid' display mode. The bark material is the only one set to 'displacement and bump,' and the only one with a tangent normal map and a displacement map. Even if I turn off the subsurf modifier and take cycles out of experimental mode, it will still crash with the same errors when trying to render it.I keep getting errors like
and
Model is a cylinder with 2 32 vert N-GON caps, which turn into a triangle fan with a high 32 valence vertex in the center with 1 level of simple sudiv. OpenSubdiv isn't a fan of such topology.
I have tried fixing the N-GONS but it has been crashing before I can.
Added subscriber: @MarcinTwarowski
Hi. I made a simplified version of the file:
treelog_simplified.blend
Simply switch from "Render Properties" tab to "Material Properties" tab. It should crash within seconds.
However, I noticed that in the "Texture Coordinate" node there's a Cylinder object referenced:
However this object doesn't seem to exist in that scene:
If you change that field to Cylinder.003
it won't crash when switching to "Material Properties" tab any more.
Added subscriber: @iss
Changed status from 'Needs Triage' to: 'Confirmed'
I catched few multi-GB allocs:
Closed as duplicate of #70530
Added subscriber: @brecht
Adaptive subdivision is not properly working yet in 2.80, and will subdivide the mesh both in Blender and Cycles. This is a known issue, one of the reasons it is still an experimental feature.
Changed status from 'Duplicate' to: 'Confirmed'
There may be more to this bug, but basically anything that fails when adaptive subdivision is disabled is not a bug, but rather something to be listed on #53901 (Cycles adaptive subdivision tasks).
Added subscriber: @DirSurya
Changed status from 'Confirmed' to: 'Archived'
Listed as a limitation in #53901, so this report is redundant.
Added subscribers: @Nielsf, @OmarEmaraDev, @mano-wii
Added subscriber: @BlueNovaAnimation