Mantaflow does not maintain color on Noise enabled (Upres Factor > 1) #90954

New Issue

Edmund Havran · 2021-08-26T10:35:46+02:00

Edmund Havran commented

2021-08-26 10:35:46 +02:00

System Information
Operating system: Ubuntu 20.04.2
Graphics card: GTX 980Ti
Blender Version
Broken: 2.93.3, 8b80d19f36, master, 2021-08-17
Worked: version: 2.83.16, branch: master, commit date: 2021-06-15 08:46, hash: 051567553d

Short description of error
Noise with Upres Factor > 1 changes original color of smoke simulation in Mantaflow.

Exact steps for others to reproduce the error

  Open Blender
  Select default Cube
  F3 > Quick Smoke
  Select default Cube > Physics Properties Tab > Change Color to blue (or whatever color you like)
  Select the Smoke Domain > Physics Properties Tab > Cache > Type Modular (Is Resumable: On)
  Bake a few frames > Press Esc
  Physics Properties Tab > Enable Noise > Upres Factor = 2 (default)
  Bake a few frames > Press Esc
  Review the simulation in the Viewport

**Note: Works with Upres Factor = 1. With some colors the effect is not that obvious. See blend-file / video.

Video on YouTube

20210826_Blender_MantaTest.blend

System Information Operating system: Ubuntu 20.04.2 Graphics card: GTX 980Ti Blender Version Broken: 2.93.3, 8b80d19f3641, master, 2021-08-17 Worked: version: 2.83.16, branch: master, commit date: 2021-06-15 08:46, hash: `051567553d` Short description of error Noise with Upres Factor > 1 changes original color of smoke simulation in Mantaflow. Exact steps for others to reproduce the error ``` Open Blender Select default Cube F3 > Quick Smoke Select default Cube > Physics Properties Tab > Change Color to blue (or whatever color you like) Select the Smoke Domain > Physics Properties Tab > Cache > Type Modular (Is Resumable: On) Bake a few frames > Press Esc Physics Properties Tab > Enable Noise > Upres Factor = 2 (default) Bake a few frames > Press Esc Review the simulation in the Viewport ``` **Note: Works with Upres Factor = 1. With some colors the effect is not that obvious. See blend-file / video. [Video on YouTube ](https://youtu.be/JzO22fS6p0E) [20210826_Blender_MantaTest.blend](https://archive.blender.org/developer/F10326547/20210826_Blender_MantaTest.blend)

Edmund Havran commented

2021-08-26 10:35:46 +02:00

Added subscribers: @EdmundHavran, @deadpin

Jesse Yurkovich commented

2021-08-26 20:03:49 +02:00

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

Jesse Yurkovich commented

2021-08-26 20:03:49 +02:00

I can confirm now. For the previous bug I had only tried 10 frames (since the report said to bake a "few" frames) which was not enough to show the change.
This appears to work with 2.83.x so I'll note that in the repro steps now too

I can confirm now. For the previous bug I had only tried 10 frames (since the report said to bake a "few" frames) which was not enough to show the change. This appears to work with 2.83.x so I'll note that in the repro steps now too

Dalai Felinto commented

2022-05-09 10:59:09 +02:00

Mantaflow (fluid simulator) has no active developer at the moment. Moving those reports as known issues so at least other users can find their issues already reported.

Philipp Oeser removed the

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Mantaflow does not maintain color on Noise enabled (Upres Factor > 1) #90954