Ocean sim only interacting with some of the scene objects

[OllyVenning]

Hi, I have a pretty simple scene - 4 objects coming from underneath an ocean sim box, and going back in again - like flying fish.
I tried this in a fresh scene and had two of these objects working fine. Now I'm trying it in the production scene (cameras, positions and scale are locked down), only one out of the four objects creates a splash.

I've reset the objects Xforms, and tried changing the scene scale in the 'grid' settings. Also tried upping the 'steps per frame' in the 'dynamics' tab.

I've also tried changing the motion velocity effect in each objects properties tab. This only really seems to affect the one object which works (I've changed the wireframe to green for this object)

I'm aware that the objects are quite small, but I can't work out why just this one would work and the others not. Any help would be really appreciated, many thanks in advance.


Using Max 2018, Phoenix 31000; scene file attached

[flipbook]

I was going to have a look but crashes to desktop upon opening. Using Max 2018.4 ... maybe something to do with your scene having corona and I do not :P .. who knows

[Svetlin.Nikolov]

Hey,

The objects are too small for the simulator to pick them up - you have to increase the grid resolution.

You can use the Output -> Special = Solid Geom Type in order to preview which voxels in the sim are affected by geometries.

Cheers!

[OllyVenning]

flipbook Thanks for trying! Weird that it wouldn;t open as there is no corona materials or objects on the scene, must be some kind of odd shader residue!
Svetlin.Nikolov Thanks for the reply. I thought it might be that and tried increasing my res. Unfortunaly my machine is hangin whne I get to about 14m cells. I have a Xeon E5-2630 v4 @ 2.2ghz; bus speed of 99.7kMhz, 48GB ram and a Quadro m4000.
I recently did a smoke sim with 34m cells, so I'm suprised my computer is hanging doing this fluid sim with 14m cells.
Can you think of any other factors that might be causing this scene to flake out?

Thanks

[Svetlin.Nikolov]

Oh, let me check. Btw, we did some fixes for Phoenix for V-Ray 4 builds for something that sounds very similar - can you try a very latest Phoenix nightly?

Cheers!

[waaazoo]

Hey,

The objects are too small for the simulator to pick them up - you have to increase the grid resolution.

You can use the Output -> Special = Solid Geom Type in order to preview which voxels in the sim are affected by geometries.

Cheers!

Do we have that in Maya also ?

[OllyVenning]

Thanks Svetlin.Nikolov , I'm not using Vray 4 (using 3.60.03), but can try a nightly build of Phoenix.

[Svetlin.Nikolov]

Ah, sorry, my bad! At what frame does the sim hang? Is it immediately on startup or sometime later?

[OllyVenning]

It hangs straight away, on frame 1 when it starts calculating

[Svetlin.Nikolov]

Huh, very strange. If I use your scene to reproduce it, are these the correct steps: I open the scene, hit Increase Resolution 4 times and Start the sim?

Would it be possible to send over the Phoenix log file that was generated immediately after the hang occurred (you can find it from the Simulator -> Simulation Rollout -> Preferences -> Open Log File Location).

Thanks!

[OllyVenning]

Hi Svetlin, I've uploaded the log file as a zip. I did exactly as you described - opened scene hit increase x4 and start the sim. I did also delete the cache first, though that shouldn't make a difference?

I noticed it actually hangs on frame 0; so it doesn't even really start. I let it try for about 5 mins until Task Manager says not responding.

Thanks for your help

[Svetlin.Nikolov]

Hummm, it seems to get stuck on interacting with the scene, so it might be some geometries, textures or forces... I have to check the scene again for missing external resources and I'll also run it some other PCs here hoping I can make it hang as well.