Regression: Issue with subdivision subsurface modifier and >= 8 levels #98693

New Issue

Tupps · 2022-06-08T21:40:32+02:00

Tupps commented

2022-06-08 21:40:32 +02:00

System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3060 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.95
CPU: Ryzen 5600x

Blender Version
Broken: version: 3.2.0, branch: master, commit date: 2022-06-08 10:22, hash: e05e1e3691
Worked: 3.1.2

Short description of error
So, I downloaded new 3.2 version and for some reasons I can't use Displacement shader with Subdivision Surface modifier above level 7. For example if I type value of 8 and hit render, it renders as if it's at level 0. In both Catmull-Clark and Simple mode and for both viewport and render options, CPU and GPU rendering.
But if I add some other modifier after Subdiv (Triangulate for example), it renders correctly.

Exact steps for others to reproduce the error

Switch render engine to Cycles
Add plane
Create a new material for it
In the shader tab, plug a noise texture (for example) to the displacement socket
In the material setting switch displacement to Displacement only
Add subdivision surface modifier to this plane
Change subdivision level to 8
Hit render

Blend file with first 7 steps included:
#98693.blend
Desktop 2022.06.08 - 23.30.38.03.mp4

**System Information** Operating system: Windows-10-10.0.19044-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3060 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.95 CPU: Ryzen 5600x **Blender Version** Broken: version: 3.2.0, branch: master, commit date: 2022-06-08 10:22, hash: `e05e1e3691` Worked: 3.1.2 **Short description of error** So, I downloaded new 3.2 version and for some reasons I can't use Displacement shader with Subdivision Surface modifier above level 7. For example if I type value of 8 and hit render, it renders as if it's at level 0. In both Catmull-Clark and Simple mode and for both viewport and render options, CPU and GPU rendering. But if I add some other modifier after Subdiv (Triangulate for example), it renders correctly. **Exact steps for others to reproduce the error** - Switch render engine to Cycles - Add plane - Create a new material for it - In the shader tab, plug a noise texture (for example) to the displacement socket - In the material setting switch displacement to Displacement only - Add subdivision surface modifier to this plane - Change subdivision level to 8 - Hit render Blend file with first 7 steps included: [#98693.blend](https://archive.blender.org/developer/F13140986/T98693.blend) [Desktop 2022.06.08 - 23.30.38.03.mp4](https://archive.blender.org/developer/F13140478/Desktop_2022.06.08_-_23.30.38.03.mp4)

Tupps commented

2022-06-08 21:40:32 +02:00

Added subscriber: @Tupps

Pratik Borhade commented

2022-06-09 05:53:43 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2022-06-09 06:20:33 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Pratik Borhade commented

2022-06-09 06:20:33 +02:00

Added subscriber: @kevindietrich

Pratik Borhade commented

2022-06-09 06:20:33 +02:00

Thanks for the report. I'm able to confirm this. Issue is only reproducible when GPU Subdivision is enabled.
This issue came between c486da0238bd - 52a5f6856268
cc @kevindietrich

(I'm not sure about the exact commit which has caused this)

Thanks for the report. I'm able to confirm this. Issue is only reproducible when GPU Subdivision is enabled. This issue came between `c486da0238bd` - `52a5f6856268` cc @kevindietrich (I'm not sure about the exact commit which has caused this)

Pratik Borhade changed title from ~~Issue with subdivision subsurface modifier and displacement shader~~ to Regression: Issue with subdivision subsurface modifier and displacement shader

2022-06-09 06:20:51 +02:00

blender-admin commented

2022-06-13 15:21:05 +02:00

This issue was referenced by a8c92331cb

This issue was referenced by a8c92331cb0b0eb99ecc2d502996be5e2dbc0adb

blender-admin commented

2022-06-13 15:21:05 +02:00

This issue was referenced by ca9d65cc97

This issue was referenced by ca9d65cc97ba8e872a0ef456e51dacadd06e237e

Brecht Van Lommel changed title from ~~Regression: Issue with subdivision subsurface modifier and displacement shader~~ to Regression: Issue with subdivision subsurface modifier and >= 8 levels

2022-06-13 20:37:36 +02:00

Brecht Van Lommel commented

2022-06-13 20:39:51 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2022-06-13 20:39:51 +02:00

This is caused by char subsurf_resolution, which overflows because resolution = (1 << 8) + 1 = 257.

I accidentally fixed it in D15184: Fix #98813: crash with GPU subdiv in edit mode and instance objects by changing the resolution to int.

This is caused by `char subsurf_resolution`, which overflows because `resolution = (1 << 8) + 1 = 257`. I accidentally fixed it in [D15184: Fix #98813: crash with GPU subdiv in edit mode and instance objects](https://archive.blender.org/developer/D15184) by changing the resolution to `int`.

Brecht Van Lommel commented

2022-06-14 14:59:55 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Brecht Van Lommel closed this issue

2022-06-14 14:59:55 +02:00

Brecht Van Lommel self-assigned this 2022-06-14 14:59:55 +02:00

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Regression: Issue with subdivision subsurface modifier and >= 8 levels #98693