Regression: Wireframe artifact on fast transforming glass-shader and motion blur on #107725

New Issue

Elias Kremer · 2023-05-08T09:36:57+02:00

Elias Kremer commented

2023-05-08 09:36:57 +02:00

System Information
Operating system: Linux-5.15.0-56-generic-x86_64-with-glibc2.35 64 Bits
Graphics card: NVIDIA GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 525.60.11

Blender Version
Broken: version: 3.3.0 Beta, branch: master, commit date: 2022-08-18 18:04, hash: rB6a4f4810f38b
Worked: version: 3.3.0 Alpha, branch: master, commit date: 2022-07-21 22:21, hash: rB7a4a6ccad74f

Short description of error
When rendering a fast transforming armature with a glass shader (I think refraction is the problem as it only occurs on the backfaces of objects), with motion blur enabled, I get artifacts. Artifacts appear on edges of object. This is only noticeable when the camera flies with approximately the same speed as the object so there is no motion blur on the glass.

Exact steps for others to reproduce the error
Use the attached blend file and hit render at the marked position, or:

Create an object with a glass material on it (no roughness!).
Create an armature for this object with one root bone and one that transforms the object.
Animate the bone for the object with high speed (15 Units per second).
Create a camera that follows the object with approximately the same speed (so you don't get motion blur on the glass).
Add some lights to the scene.
Hit render with motion blur enabled.

**System Information** Operating system: Linux-5.15.0-56-generic-x86_64-with-glibc2.35 64 Bits Graphics card: NVIDIA GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 525.60.11 **Blender Version** Broken: version: 3.3.0 Beta, branch: master, commit date: 2022-08-18 18:04, hash: `rB6a4f4810f38b` Worked: version: 3.3.0 Alpha, branch: master, commit date: 2022-07-21 22:21, hash: `rB7a4a6ccad74f` **Short description of error** When rendering a fast transforming armature with a glass shader (I think refraction is the problem as it only occurs on the backfaces of objects), with motion blur enabled, I get artifacts. Artifacts appear on edges of object. This is only noticeable when the camera flies with approximately the same speed as the object so there is no motion blur on the glass. **Exact steps for others to reproduce the error** Use the attached blend file and hit render at the marked position, or: 1. Create an object with a glass material on it (no roughness!). 2. Create an armature for this object with one root bone and one that transforms the object. 3. Animate the bone for the object with high speed (15 Units per second). 4. Create a camera that follows the object with approximately the same speed (so you don't get motion blur on the glass). 5. Add some lights to the scene. 6. Hit render with motion blur enabled.

wireframe_motionblur_bug_006.blend

637 KiB

wireframe_artifact_001.png

1.5 MiB

👀 1

Elias Kremer added the

labels 2023-05-08 09:36:58 +02:00

Iliya Katushenock changed title from ~~Wireframe artifact gets visible on fast transforming armature with glass-shader and motion blur on.~~ to Regression: Wireframe artifact on fast transforming glass-shader and motion blur on

2023-05-08 10:38:13 +02:00

Iliya Katushenock added

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Regression: Wireframe artifact on fast transforming glass-shader and motion blur on #107725