Regression: OptiX denoising artifacts at high sample counts in specific scenes. #93029

New Issue

Alaska · 2021-11-12T08:14:42+01:00

Alaska commented

2021-11-12 08:14:42 +01:00

System Information
Operating system: Linux-5.14.0-4-amd64-x86_64-with-glibc2.32 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 495.44

Blender Version
Broken version: 3.1.0 Alpha, branch: master, commit date: 2021-11-12 03:57, hash: 1e1c870001 and presumably Blender 3.0
Worked: Prior to 440a3475b8

Short description of error
When rendering with a high sample count with the Albedo auxiliary pass enabled in specific scenes, some artifacts can occur. This issue was introduced by 440a3475b8 based on my bisecting. Here are some images showing what it looks like:


Prior to `440a3475b8`	After `440a3475b8`

Exact steps for others to reproduce the error
OptiX denoising artifacts at high sample counts.blend

Option 1:

Download the attached scene and render the scene with a OptiX denoiser compatible device. (Either viewport rendering or final render works). If you use viewport rendering, you will notice the artifacts start to appear at high sample counts. With Adaptive Sampling on the issue doesn't appear to occur due to low sample counts.

Option 2:

Create a new .blend file and change the render engine to Cycles.
Disable Adaptive Sampling and enable the OptiX denoiser with the Albedo auxiliary pass in the relevant rendering mode (viewport or final render). It's important to disable the Adaptive Sampling here as this issue only appears to occur at high sample counts which Adaptive Sampling doesn't allow in simple scenes.
Change the World background to a Sky Texture.
Place the camera/view underneath the default cube and look up at it. Render the scene and once you reach a high sample count the issue will start to appear. It starts to appear at 1024 samples for me, but gets significantly more noticeable up to 4096 samples.

**System Information** Operating system: Linux-5.14.0-4-amd64-x86_64-with-glibc2.32 64 Bits Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 495.44 **Blender Version** Broken version: 3.1.0 Alpha, branch: master, commit date: 2021-11-12 03:57, hash: `1e1c870001` and presumably Blender 3.0 Worked: Prior to 440a3475b8 **Short description of error** When rendering with a high sample count with the `Albedo` auxiliary pass enabled in specific scenes, some artifacts can occur. This issue was introduced by 440a3475b8 based on my bisecting. Here are some images showing what it looks like: |![ Old artifact free.png](https://archive.blender.org/developer/F11795946/_Old_artifact_free.png)|![New denoising artifacts.png](https://archive.blender.org/developer/F11795948/New_denoising_artifacts.png)| | -- | -- | |Prior to `440a3475b8`|After `440a3475b8`| **Exact steps for others to reproduce the error** [OptiX denoising artifacts at high sample counts.blend](https://archive.blender.org/developer/F11795965/OptiX_denoising_artifacts_at_high_sample_counts.blend) Option 1: 1. Download the attached scene and render the scene with a OptiX denoiser compatible device. (Either viewport rendering or final render works). If you use viewport rendering, you will notice the artifacts start to appear at high sample counts. With `Adaptive Sampling` on the issue doesn't appear to occur due to low sample counts. Option 2: 1. Create a new .blend file and change the render engine to Cycles. 2. Disable `Adaptive Sampling` and enable the OptiX denoiser with the `Albedo` auxiliary pass in the relevant rendering mode (viewport or final render). It's important to disable the `Adaptive Sampling` here as this issue only appears to occur at high sample counts which `Adaptive Sampling` doesn't allow in simple scenes. 3. Change the `World background` to a `Sky Texture`. 4. Place the camera/view underneath the default cube and look up at it. Render the scene and once you reach a high sample count the issue will start to appear. It starts to appear at 1024 samples for me, but gets significantly more noticeable up to 4096 samples.

Alaska commented

2021-11-12 08:14:42 +01:00

Added subscriber: @Alaska