Solidify modifier with Complex mode and negative thickness not pointing normals outside #92631

New Issue

Phil Stopford · 2021-10-30T01:58:28+02:00

Phil Stopford commented

2021-10-30 01:58:28 +02:00

System Information
Operating system: Windows 10 21H1
Graphics card: RTX 3070

Blender Version
Broken: 3.0.0-beta,v30.b838eaf2b960
Worked: 2.93.5

Short description of error
Volumes with transparent BSDF are rendering very differently to 2.93 and the transparency seems to be ignored. Both CPU and GPU show this difference

Exact steps for others to reproduce the error
Load this scene into blender and hit F12.

volcheck.blend

3.0 beta renders	2.93.5 renders:

**System Information** Operating system: Windows 10 21H1 Graphics card: RTX 3070 **Blender Version** Broken: 3.0.0-beta,v30.b838eaf2b960 Worked: 2.93.5 **Short description of error** Volumes with transparent BSDF are rendering very differently to 2.93 and the transparency seems to be ignored. Both CPU and GPU show this difference **Exact steps for others to reproduce the error** Load this scene into blender and hit F12. [volcheck.blend](https://archive.blender.org/developer/F11608604/volcheck.blend) | 3.0 beta renders | 2.93.5 renders: | | -- | -- | | ![300beta.png](https://archive.blender.org/developer/F11608600/300beta.png) | ![293.png](https://archive.blender.org/developer/F11608599/293.png) |

Phil Stopford commented

2021-10-30 01:58:28 +02:00

Added subscriber: @phil.stopford

Pratik Borhade commented

2021-10-30 13:52:23 +02:00

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

Brecht Van Lommel commented

2021-11-03 20:14:27 +01:00

Added subscribers: @HDMaster84, @brecht

Brecht Van Lommel commented

2021-11-03 20:14:27 +01:00

This appears to be a change in the solidify modifier behavior with negative thickness in Complex mode.

I've attached a .blend with face orientation overlay to demonstrate it. The normals are pointing inside, and for Cycles volume rendering this is not supported. In 2.93 they were pointing outside.
volcheck_show_face_orientation.blend

@HDMaster84 might know if this was intentional.

This appears to be a change in the solidify modifier behavior with negative thickness in Complex mode. I've attached a .blend with face orientation overlay to demonstrate it. The normals are pointing inside, and for Cycles volume rendering this is not supported. In 2.93 they were pointing outside. [volcheck_show_face_orientation.blend](https://archive.blender.org/developer/F11700832/volcheck_show_face_orientation.blend) @HDMaster84 might know if this was intentional.

Brecht Van Lommel changed title from ~~Blender 3.0 renders volumes very differently to 2.93~~ to Solidify modifier with Complex mode and negative thickness not pointing normals outside

2021-11-03 20:15:13 +01:00

Henrik D. commented

2021-11-04 10:48:03 +01:00

1454865ebb should be the latest change to that solidify behavior, but it was from 2.90 to 2.91, I will test the file and check if there is a change that I am not aware of and report back.

1454865ebb should be the latest change to that solidify behavior, but it was from 2.90 to 2.91, I will test the file and check if there is a change that I am not aware of and report back.

Henrik D. commented

2021-11-04 20:57:21 +01:00

This is caused by D11832. Seems like there is a real bug. The goal of that patch was to match complex solidify more closely to simple solidify. That is not the case anymore if the thickness is negative.

This is caused by [D11832](https://archive.blender.org/developer/D11832). Seems like there is a real bug. The goal of that patch was to match complex solidify more closely to simple solidify. That is not the case anymore if the thickness is negative.

blender-admin commented

2021-11-22 15:33:49 +01:00

This issue was referenced by 819b9bdfa1

This issue was referenced by 819b9bdfa156082f6778337909cea9ad0c60d84d

Hans Goudey commented

2021-11-22 15:34:38 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Hans Goudey closed this issue

2021-11-22 15:34:38 +01:00

Hans Goudey self-assigned this 2021-11-22 15:34:38 +01:00

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Solidify modifier with Complex mode and negative thickness not pointing normals outside #92631