Cycles: not updating for homogeneous to heterogeneous volume change in viewport render #92028

New Issue

Alaska · 2021-10-08T02:58:32+02:00

Alaska commented

2021-10-08 02:58:32 +02:00

System Information:
Operating system: Linux-5.14.0-1-amd64-x86_64-with-glibc2.32 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 470.63.01

Blender Version:
Broken version: 3.0.0 Alpha, branch: master, commit date: 2021-10-07 19:35, hash: 23791db145
Broken version: 2.93
Broken version: 2.92
Broken version: 2.91
Broken version: 2.90
Broken version: 2.83
Worked: 2.82

Short description of error:
When creating a certain volumetric material on an object with a specific set of actions, the volume will end up being "2 dimensional" or only surface level until viewport rendering is reset or other settings are changed.


2D result (broken)	Expected result

Exact steps for others to reproduce the error:

Start with the default scene and change the render engine to Cycles.
Change to the Rendered Viewport mode.
Open a shader editor along side the 3D viewport and delete the Principled BSDF and add Volume Scatter node and attach the output from the Volume Scatter node to the socket in the Material Output node.
Add a texture node (Noise Texture in my case) and attach one of the outputs to the Density socket of the Volume Scatter node.
Add a Color Ramp node between the Noise Texture and Volume Scatter node and adjust the handles to create extreme contrast.
In the 3D viewport you should now be able to see that the volume appears to be 2D/only surface level. Changing to some other Viewport mode than back to the Rendered Viewport mode fixes it.

Here's a video demonstrating the issue:
Volume appears 2D in specific situations.mp4

**System Information:** Operating system: Linux-5.14.0-1-amd64-x86_64-with-glibc2.32 64 Bits Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 470.63.01 **Blender Version:** Broken version: 3.0.0 Alpha, branch: master, commit date: 2021-10-07 19:35, hash: `23791db145` Broken version: 2.93 Broken version: 2.92 Broken version: 2.91 Broken version: 2.90 Broken version: 2.83 Worked: 2.82 **Short description of error:** When creating a certain volumetric material on an object with a specific set of actions, the volume will end up being "2 dimensional" or only surface level until viewport rendering is reset or other settings are changed. |![Cycles Volume - 2D result.png](https://archive.blender.org/developer/F10859534/Cycles_Volume_-_2D_result.png)|![Cycles Volume 3D result.png](https://archive.blender.org/developer/F10859541/Cycles_Volume_3D_result.png)| | -- | -- | |2D result (broken)|Expected result| **Exact steps for others to reproduce the error:** 1. Start with the default scene and change the render engine to Cycles. 2. Change to the `Rendered Viewport` mode. 3. Open a shader editor along side the `3D viewport` and delete the `Principled BSDF` and add `Volume Scatter` node and attach the output from the `Volume Scatter` node to the socket in the `Material Output` node. 5. Add a texture node (`Noise Texture` in my case) and attach one of the outputs to the `Density` socket of the `Volume Scatter` node. 6. Add a `Color Ramp` node between the `Noise Texture` and `Volume Scatter` node and adjust the handles to create extreme contrast. 7. In the 3D viewport you should now be able to see that the volume appears to be 2D/only surface level. Changing to some other `Viewport mode` than back to the `Rendered Viewport` mode fixes it. Here's a video demonstrating the issue: [Volume appears 2D in specific situations.mp4](https://archive.blender.org/developer/F10859972/Volume_appears_2D_in_specific_situations.mp4)

Alaska commented

2021-10-08 02:58:32 +02:00

Added subscriber: @Alaska

blender-admin commented

2021-10-08 02:58:32 +02:00

#97134 was marked as duplicate of this issue

blender-admin commented

2021-10-08 02:58:32 +02:00

#93358 was marked as duplicate of this issue

Alaska changed title from ~~Cycles: Creating a certain volumetric material in a specific order results in the volume being 2D~~ to Cycles: Creating a certain volumetric material in a specific order results in the volume only appearing on the surface

2021-10-08 04:04:54 +02:00

Germano Cavalcante commented

2021-10-08 17:21:48 +02:00

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

Germano Cavalcante commented

2021-10-08 17:21:48 +02:00

Added subscriber: @mano-wii

Brecht Van Lommel changed title from ~~Cycles: Creating a certain volumetric material in a specific order results in the volume only appearing on the surface~~ to Cycles: not updating for homogeneous to heterogeneous volume change in viewport render

2021-11-04 16:57:40 +01:00

Raimund Klink commented

2021-11-04 17:04:17 +01:00

Added subscriber: @Raimund58