Cycles Bevel Shader works across objects with Embree / CPU #79723

New Issue

Steffen Dünner · 2020-08-11T23:13:11+02:00

Steffen Dünner commented

2020-08-11 23:13:11 +02:00

System Information
Operating system: Linux-5.4.0-42-generic-x86_64-with-debian-bullseye-sid 64 Bits
Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 450.51.06

Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-08-11 20:18, hash: ec5f392087
Worked: never (?)

Short description of error
The Bevel shader gives different results with CPU vs. GPU.
I know that Optix doesn't support the Bevel shader at the moment but I'm talking about CUDA so that isn't the reason for it to not work.
The geometry in the repro blend file is split. The front and the rim polygons are in two different objects but they share the same material.

Exact steps for others to reproduce the error

Open the attached blend file:
Bevel_v01.blend
Press F12 (= GPU used for rendering, just make sure it's set up correctly depending on your configuration):
Switch the rendering device to CPU and press F12 again:

Now there's a bevelled edge that isn't there when using GPU rendering.

**System Information** Operating system: Linux-5.4.0-42-generic-x86_64-with-debian-bullseye-sid 64 Bits Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 450.51.06 **Blender Version** Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-08-11 20:18, hash: `ec5f392087` Worked: never (?) **Short description of error** The Bevel shader gives different results with CPU vs. GPU. I know that Optix doesn't support the Bevel shader at the moment but I'm talking about CUDA so that isn't the reason for it to not work. The geometry in the repro blend file is split. The front and the rim polygons are in two different objects but they share the same material. **Exact steps for others to reproduce the error** - Open the attached blend file: [Bevel_v01.blend](https://archive.blender.org/developer/F8770661/Bevel_v01.blend) - Press F12 (= GPU used for rendering, just make sure it's set up correctly depending on your configuration): ![Bevel_GPU.png](https://archive.blender.org/developer/F8770663/Bevel_GPU.png) - Switch the rendering device to CPU and press F12 again: ![Bevel_CPU.png](https://archive.blender.org/developer/F8770666/Bevel_CPU.png) Now there's a bevelled edge that isn't there when using GPU rendering.

Steffen Dünner commented

2020-08-11 23:13:11 +02:00

Added subscriber: @SteffenD

Bent Hillerkus commented

2020-08-12 13:44:40 +02:00

Added subscriber: @bent

Philipp Oeser commented

2020-08-12 15:09:18 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-08-12 15:09:18 +02:00

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

Philipp Oeser commented

2020-08-12 15:09:18 +02:00

As you said, it works if the meshes are joined.

In 2.83, this doesnt even work on CPU across object boundaries afaict, something changed for the better already.
(Havent checked the exact commit where this improved)

But can confirm, it is not working on GPU for me either.
For comparison: Ambient Occlusion does work across object boundaries.

As you said, it works if the meshes are joined. In 2.83, this doesnt even work on CPU across object boundaries afaict, something changed for the better already. (Havent checked the exact commit where this improved) But can confirm, it is not working on GPU for me either. For comparison: `Ambient Occlusion` does work across object boundaries.

Philipp Oeser changed title from ~~Cycles Bevel Shader Difference CPU vs. GPU (CUDA)~~ to Cycles Bevel Shader doesnt seem to work across object boundaries on CUDA (works on CPU)

2020-08-12 15:10:46 +02:00

Brecht Van Lommel commented

2020-08-12 15:53:09 +02:00

Added subscribers: @Stefan_Werner, @brecht

Brecht Van Lommel commented

2020-08-12 15:53:09 +02:00

It's not supposed to have an effect across objects. The bug here is in the Embree integration.

@Stefan_Werner, can you have a look?

It's not supposed to have an effect across objects. The bug here is in the Embree integration. @Stefan_Werner, can you have a look?

Brecht Van Lommel changed title from ~~Cycles Bevel Shader doesnt seem to work across object boundaries on CUDA (works on CPU)~~ to Cycles Bevel Shader works across objects with Embree / CPU

2020-08-12 15:53:29 +02:00

Stefan Werner self-assigned this 2020-08-17 16:01:43 +02:00

blender-admin commented

2020-08-17 16:04:01 +02:00

This issue was referenced by blender/cycles@8d206e13b3

This issue was referenced by blender/cycles@8d206e13b3d5c398c0e2bd24417337af753c2616

blender-admin commented

2020-08-17 16:04:01 +02:00

This issue was referenced by 1c892e6814

This issue was referenced by 1c892e6814adf7431aa9abbe1bd560547f7144d2

blender-admin commented

2020-08-17 16:04:01 +02:00