liquid sim + ocean mesh error

[mark_aldred]

I've just output a 900 frame simulation, rendered it and found errors. It's a ship wake sim with ocean mesh similar to the ship tutorial in the manual. The waves inside the simulator seem to flatten out every 15 frames.
What could be causing this and how can I troubleshoot? I have no idea even where I should start.

Thanks

[slavina.nikolova]

Hey,

Sounds like a missing Output Channel - do you have the Grid Velocity and Particle Velocity Channels enabled in the Output rollout?

Also, can you show us your settings and can you tell us which is your Phoenix version? To find out the exact Phoenix version, you can check the About info window. 3ds Max → Top 3ds Max Phoenix FD Menu → About Phoenix.


Thanks!

[mark_aldred]

Checking Grid Velocity fixed it! Thanks.
It looks like every 15th frame were the proper ones and the others were being over-deformed, so I'm going to have to adjust the height etc.

I have another question if you don't mind. I have small fragments appearing in certain frames. In the attached data, there's one in frame 0348 but not in the surrounding frames.
fragment.zip

What's causing this?

Thanks

[slavina.nikolova]

Hey,

Could it be a flying droplet?
Can you send the scene with a few caches where the fragments appear so we can check it out and see what's happening?


Cheers!

[mark_aldred]

Here's the file ..
ship_007_sample.zip

.. and here's some cache files, The file was too large to upload here. Please click the button I've circled to download ..
https://42.gigafile.nu/0823-f68c3d2d...2184d1b499f879



The most obvious one is 0348 but they're visible in the other files too.


I'm using max 2020 and 4.41.02 Nightly.
Thanks!

[slavina.nikolova]

Thanks for the scene!
It looks like you have small liquid droplets that are flying away. The Grid Resolution seems a bit low, so increasing it a bit might help. You will need to simulate again.
Another thing that might help, is the Isosurface Level option located in the Rendering rollout. Adjusting it's value might help and you won't need to simulate again in order to see the result.

Hope this helps!

[mark_aldred]

I tried Isosurface Level and the problem disappeared at 1.0, but it interfered with the surface too much. I'll try upping the grid resolution and render again tomorrow.

Thanks for the help!