Foam outside container not rendering in Ocean Mesh mode

[joshclos]

I'm in 3.03 and I have a sim of a boat slowly traveling with a moving container and if I set the mesh mode to "Mesh," I can see the foam trail that goes beyond the container but once set to Ocean Mesh, even without displacement, it cuts off the foam at the end of the container.

[UPDATE] I sort of figured this out. It looks like the foam outside the container lowers its position once it travels beyond the container so the ocean level was covering the outside foam. So if I lower the ocean level, I can now see the foam but the ocean level is lower than I'd like. The sim is pretty low res at about 2,000,000 grid and I've found this "lowering" of particles outside the grid is less at higher resolutions. This should work for now - I'll test more at home.

Thanks

[Svetlin.Nikolov]

Indeed, since the liquid level outside the container could be a bit lower of a bit higher than the simulated liquid, the particles may suddenly and up underwater at the moment they exit the container and they might disappear from rendering or change their dynamics at the border. I did a small tweak regarding this in the nightlies a couple of months back, but there will always be at least a small change of behavior when particles exit the container since on many occasions they need the specific simulated velocity that is available inside the grid and can't be extrapolated outside the grid with such quality that the transition is always seamless. If possible, always make sure that large amounts of ocean particles don't exit the grid - this might look okay in some situations, but you should not count on that.

Cheers!

[joshclos]

After some more testing it seems like this issue can be totally fixed by raising the resolution a little or increasing the container size. I was looking for minimum values to get a decent sim - I'm still impressed because I have a 2 million grid res container that sims 240 frames in 7 minutes with foam and looks totally acceptable for "non-hero" shots. That's fast! I've compared this same sim and resolution in Realflow and Maya with Bifrost and so far, phoenix is the fastest I've gotten yet. By a large margin!

[Svetlin.Nikolov]

Yay, hope it does the job well! We just gotta fix everything and then fix everything..