Blender artifacts when rendering overlapping objects with CUDA #99254

New Issue

Nadra Nagy · 2022-06-29T00:55:06+02:00

Nadra Nagy commented

2022-06-29 00:55:06 +02:00

System Information
Operating system: Windows 64
Graphics card: Nvidia 1660
Driver version: 516.59

Blender Version
3.0.1

Short description of error
Blender artifacts when rendering overlapping objects with CUDA

Exact steps for others to reproduce the error

Open .blend
Select CUDA from preferences
Select cycles render engine -> GPU compute
Render image
Here's the file matcaps2.blend

GPU Render	CPU Render

**System Information** Operating system: Windows 64 Graphics card: Nvidia 1660 Driver version: 516.59 **Blender Version** 3.0.1 **Short description of error** Blender artifacts when rendering overlapping objects with CUDA **Exact steps for others to reproduce the error** - Open .blend - Select CUDA from preferences - Select cycles render engine -> GPU compute - Render image Here's the file [matcaps2.blend](https://archive.blender.org/developer/F13235539/matcaps2.blend) | GPU Render | CPU Render | | -- | -- | | ![image.png](https://archive.blender.org/developer/F13235548/image.png) | ![image.png](https://archive.blender.org/developer/F13235551/image.png) |

Nadra Nagy commented

2022-06-29 00:55:06 +02:00

Added subscriber: @oOo_Nebula_oOo

Nadra Nagy commented

2022-06-29 01:02:20 +02:00

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

Nadra Nagy commented

2022-06-29 01:02:20 +02:00

I had two spheres on top of each other, and when I hid one of the the render looked fine (GPU render).

I had two spheres on top of each other, and when I hid one of the the render looked fine ![image.png](https://archive.blender.org/developer/F13235593/image.png) (GPU render).

Pratik Borhade commented

2022-08-12 09:03:15 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2022-08-12 09:03:15 +02:00

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

Pratik Borhade commented

2022-08-12 09:03:15 +02:00

Thanks for the report. I can confirm this in 2.93-3.4 versions when CUDA is used for rendering

CPU	GPU-OptiX	GPU-CUDA

Operating system: Windows-10-10.0.22000-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3050 Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.78

Thanks for the report. I can confirm this in 2.93-3.4 versions when CUDA is used for rendering | CPU | GPU-OptiX | GPU-CUDA | | -- | -- | -- | | ![#99254-CPU.png](https://archive.blender.org/developer/F13368796/T99254-CPU.png) | ![#99254-GPU-Optix.png](https://archive.blender.org/developer/F13368797/T99254-GPU-Optix.png) | ![#99254-GPU-CUDA.png](https://archive.blender.org/developer/F13368794/T99254-GPU-CUDA.png) | - - - ```**System Information** Operating system: Windows-10-10.0.22000-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3050 Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.78 ```

Pratik Borhade changed title from ~~Blender crashes and render messed up after updating GeForce driver 516.59 2022~~ to Blender artifacts when rendering overlapping objects with CUDA

2022-08-12 09:07:22 +02:00

Pratik Borhade commented

2022-08-12 09:08:05 +02:00

Could you open a new report for the crash you're experiencing?

Brecht Van Lommel commented

2022-08-12 13:20:51 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2022-08-12 13:20:51 +02:00

Changed status from 'Confirmed' to: 'Archived'

Brecht Van Lommel closed this issue

2022-08-12 13:20:51 +02:00

Brecht Van Lommel commented

2022-08-12 13:20:51 +02:00

This is a known limitation / trade-off of the ray tracing precision changes made in Blender 3.1. Exactly overlapping geometry now must be explicitly avoided, while precision improved in other areas.

The result can be different between devices.

This is a known limitation / trade-off of the ray tracing precision changes made in Blender 3.1. Exactly overlapping geometry now must be explicitly avoided, while precision improved in other areas. The result can be different between devices.

Pratik Borhade commented

2022-08-12 13:33:49 +02:00

This is a known limitation / trade-off of the ray tracing precision changes made in Blender 3.1.

Hi Brecht, you're referring to Ray_Tracing_Precision and 74afc86d4b right?
But this is not something introduced after that commit. Issue is even replicable in 2.93.

> This is a known limitation / trade-off of the ray tracing precision changes made in Blender 3.1. Hi Brecht, you're referring to [Ray_Tracing_Precision ](https://wiki.blender.org/wiki/Reference/Release_Notes/3.1/Cycles#Ray_Tracing_Precision) and 74afc86d4b right? But this is not something introduced after that commit. Issue is even replicable in 2.93.

Brecht Van Lommel commented

2022-08-12 13:36:52 +02:00

Yes, this never worked reliably before that either. But that description describes the current state.

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Blender artifacts when rendering overlapping objects with CUDA #99254