Cycles shows transmission in displaced shader as black #100914

New Issue

System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: Quadro M2200/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 513.29

Blender Version
Broken: version: 3.3.0, branch: master, commit date: 2022-09-06 15:39, hash: 0759f671ce
Worked: Blender 3.4 Apha
BlenderIsCrazy.blend
Short description of error
[Please fill out a short description of the error here]

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]
I attached a demo file where the visual result in Blender 3.3 (and older) differs from the Result from Blender 3.4. I have not found information on a fix that was introduced to BL 3.4 alpha.
Enabling shader displacement in a (Glass-Like) transmissive object results in black parts where there would never be black (refractions/reflections).
Disabling adaptive subdivison does not make a difference.

Issue is fixed in 3.4 - Due to the fact that BL 3.3 is LTS it would be extremely useful to have this also fixed for 3.3.

**System Information** Operating system: Windows-10-10.0.19044-SP0 64 Bits Graphics card: Quadro M2200/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 513.29 **Blender Version** Broken: version: 3.3.0, branch: master, commit date: 2022-09-06 15:39, hash: `0759f671ce` Worked: Blender 3.4 Apha [BlenderIsCrazy.blend](https://archive.blender.org/developer/F13468583/BlenderIsCrazy.blend) **Short description of error** [Please fill out a short description of the error here] **Exact steps for others to reproduce the error** [Please describe the exact steps needed to reproduce the issue] [Based on the default startup or an attached .blend file (as simple as possible)] I attached a demo file where the visual result in Blender 3.3 (and older) differs from the Result from Blender 3.4. I have not found information on a fix that was introduced to BL 3.4 alpha. Enabling shader displacement in a (Glass-Like) transmissive object results in black parts where there would never be black (refractions/reflections). Disabling adaptive subdivison does not make a difference. Issue is fixed in 3.4 - Due to the fact that BL 3.3 is LTS it would be extremely useful to have this also fixed for 3.3. ![grafik.png](https://archive.blender.org/developer/F13468588/grafik.png)

Added subscriber: @Hartmut

Added subscriber: @PratikPB2123

Fix came between fb7ef40006 - c22256f387.

Fix came between fb7ef40006b9 - c22256f3871b.

In #100914#1414070, @PratikPB2123 wrote:
Fix came between fb7ef40006 - c22256f387.

but it did not land in 3.3 master it seems. I re-downloaded the 3.3 final release today and the issue persists on 3.3.

> In #100914#1414070, @PratikPB2123 wrote: > Fix came between fb7ef40006b9 - c22256f3871b. but it did not land in 3.3 master it seems. I re-downloaded the 3.3 final release today and the issue persists on 3.3.

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Added subscriber: @brecht

Changed in e949d6da5b
Looking at the commit I don't think it make sense to backport large commit
@brecht , could you look at this report?

Changed in e949d6da5b Looking at the commit I don't think it make sense to backport large commit @brecht , could you look at this report?

This issue was referenced by 19ae71c113

This issue was referenced by 19ae71c113424e1797b678cd32c41a07a3f28986

Changed status from 'Needs Developer To Reproduce' to: 'Resolved'

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Cycles shows transmission in displaced shader as black #100914