Mantaflow grid visible in spray, foam and bubbles particles #79995
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Unbreak Now!
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Reference: blender/blender#79995
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System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 451.67
Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-08-21 15:43, hash:
74ded456b3
Short description of error
Spray, foam and bubbles particles take the shape of the grid when simulated.
Exact steps for others to reproduce the error
mantaflow_bug.blend
Foam and bubble particles are very blocky and unnatural
Added subscriber: @thornydre
Added subscriber: @iss
Changed status from 'Needs Triage' to: 'Needs User Info'
Please upload simplest possible .blend file that represents the issue. I don't think you need 3GB of data for that. Even if those are caches, we need to re-bake(should be quick as well) to confirm issue.
Sorry for that, here is the file without the caches, and the videos :
mantaflow_bug.blend
Bubbles:
mantaflow_bug3_bubbles_front.mp4
Foam:
mantaflow_bug2_foam_front.mp4
Spray:
mantaflow_bug1_spray_front.mp4
Changed status from 'Needs User Info' to: 'Needs Triage'
Added subscriber: @Raimund58
Could reproduce it in Blender 2.91 (commit date: 2020-08-25 19:28, hash:
396d39c6b9
)Changed status from 'Needs Triage' to: 'Confirmed'
Blender 2.83.5
Added subscriber: @sebbas
Looking into this right now. There was a similar issue in #73552 - seems like foam and bubbles still have issues.
Hey, I just wanted to know if there was any news about this bug ?
@sebbas Is this indeed similar to #73552? I am a bit curios about the outcome :)
@Raimund58 The reason for the grid patterns are the hard cut-off values for spray, foam, bubble transitions. I.e. the values that determine when a particle changes type.
For now, the only way I see to get around this is to use a higher particle grid resolution (e.g. particle upres = 2 -> twice the base resolution). Depending on the scene and hardware limits, I would also lower the sampling values to better control the number of particles.
Alright, thank you for the info :)
Mantaflow (fluid simulator) has no active developer at the moment. Moving those bugs as known issues so at least other users can find their issues already reported.