Maniphest T71120

Line at intersecting volumes
Closed, Resolved
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Assigned To
Bjørn-Andre (BacMan12)
Authored By
Bjørn-Andre (BacMan12)
Oct 26 2019, 5:57 PM
Tags
  • BF Blender
Subscribers
Bjørn-Andre (BacMan12)
Marcin Twarowski (Tvaroog)

Description

IntersectingVolumes_Bug.blend104 KBDownload

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 980M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.97

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: rBf6cb5f54494e
Worked: (optional)

Short description of error
Two intersecting volumes makes a very visable clear line.

Exact steps for others to reproduce the error
Make two cubes with a volume shader, don't make the too dense and maybe add a procedural texture.
take one halfway inside another

Event Timeline

Bjørn-Andre (BacMan12) created this task.Oct 26 2019, 5:57 PM
Bjørn-Andre (BacMan12) added a comment.Oct 26 2019, 6:01 PM

Not even completely sure if it's a bug at all, but it's a bit anoying.
I bet for now i have to combine the two shaders into one cube. But my way would be quicker if it worked.

Image of the artwork with the issue.

Marcin Twarowski (Tvaroog) added a subscriber: Marcin Twarowski (Tvaroog).EditedOct 28 2019, 9:50 AM

In the example file you attached there's an obvious z-fight where faces of the cubes align.


When rendered cubes don't blend well:

However if I move one cube slightly in x and y axis, so that z-fight is gone:

volumes blend quite well:

Windows-10-10.0.16299 64 Bits
GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.86
2.81 (sub 16), branch: master, commit date: 2019-10-27 13:40, hash: rB9b6aa740be31

Bjørn-Andre (BacMan12) added a comment.Oct 28 2019, 5:11 PM
In T71120#801870, @Marcin Twarowski (Tvaroog) wrote:

In the example file you attached there's an obvious z-fight where faces of the cubes align.


When rendered cubes don't blend well:

However if I move one cube slightly in x and y axis, so that z-fight is gone:

volumes blend quite well:

Windows-10-10.0.16299 64 Bits
GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.86
2.81 (sub 16), branch: master, commit date: 2019-10-27 13:40, hash: rB9b6aa740be31

Oh really, i didn't know volumes was affected by z-fighting.

Bjørn-Andre (BacMan12) changed the task status from Unknown Status to Resolved.Oct 28 2019, 5:40 PM
Bjørn-Andre (BacMan12) claimed this task.

It worked, thanks.
I really didn't though volumes was affected by this.
A bit annoying, but i guess it's more of a overall CAD problem than blender

Marcin Twarowski (Tvaroog) added a comment.Oct 28 2019, 6:55 PM

This could still be considered a bug, I'm not sure.