Meshing of fluid particle system doesnt appear to capture cavities properly on a plunging wave. #73447
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Reference: blender/blender#73447
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System Information
Operating system: Linux-5.3.0-26-generic-x86_64-with-Ubuntu-19.10-eoan 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21
Blender Version
Broken: version: 2.83 (sub 1), branch: master, commit date: 2020-01-27 06:02, hash:
65e42d7b32Worked: (optional)
Short description of error
Meshing of fluid particle system doesnt appear to capture cavities properly on a plunging wave.
Exact steps for others to reproduce the error
Open the attached wavepool.blend. Bake Data in the domain object.
You will see the particles appear to break in a plunging fashion, indicating a cavity in the particle system, where the wave is breaking.
Click on Bake Mesh. The baked mesh appears to 'join' from the crest of the wave, to the particles adjacent in the z dimension.
Not sure if this is possible, but it would be nice.
Added subscriber: @rezu
Particles only.
results of meshing view. Note Particle radius of 0.01 (1cm?), Cavity upper of 0.5
Cavity lower/upper of 0.01 & .015
This comment was removed by @rezu
This comment was removed by @rezu
wavepool.blend
Test case blender file
Added subscriber: @JacquesLucke
Changed status from 'Needs Triage' to: 'Needs User Info'
It looks like the resolution of the mesh is simply not large enough to capture this kind of detail. You might also want to plain with the
Particle Radiusproperty.Please check if a higher resolution mesh solves this issue.
Thanks.
I will look at this tonight.
I have a feeling this is a wontfix, however:
I think what is happening is that the velocity of the particles up the face of the wave, cause a gap in the particle grid. This may be excacerbated by the particle grid size.
I will test with a smaller domain with more packed particles, (at the moment it is at 256 particles for the domain over 30m(?) )
Attached are screenshots illustrating the gap in the particle field under a cresting wave. This is looking out from within the fluid, through the face of the breaking wave. You will notice to the left of these images, where the crest has not yet broken, the particle field is not broken.
Thanks!
Added subscriber: @ideasman42
@sebbas could you confirm if this should be considered a bug or not?
Changed status from 'Needs User Info' to: 'Needs Developer To Reproduce'
Changed status from 'Needs Developer To Reproduce' to: 'Needs User Info'
@rezu Would like to check if this is still an issue. Not sure if the attached file is the correct one - the "Generator" object was not doing any movements for me.
Can you try to reproduce the issue with the latest master?
I'll have a look at this within the next few days.
Just gotta dust off my desktop machine.
There is no generator per-se, just an inflow which is a body of water which falls.
Trying this with blender-2.91.0-7cd2c1fd2e7a
I cannot get plunging wave mechanics with my existing files.
Perhaps a config change, that affects something like viscosity/mass & causing it to not behave the same. Clutching at straws here though..
I will try to recreate the file, but this may be in a while, if you want to close this, do so. I can re-open if this is still the case.
Thanks
Changed status from 'Needs User Info' to: 'Resolved'
Mmh, interesting. It could be because there were some changes to gravities in 2.90.
Will try to recreate the scene too and reopen if I find something odd. Thanks!