Dyverso - Caronte Explosions

[hmercado]

Hi,
Just to see if anyone has an idea of what could be causing this.

I have set up a simple hybrido scene to splash and wash away some rigid bodies, but some of the rigid bodies (the smaller ones so far) are exploding (popping like pop corn ) just after they make contact with the fluid.

I have set the caronte settings quality and jitter to 100, and diverso PBD solver min and max substeps at 6. I am also simulating at 240f/s

Here is a link to the video preview:
http://www.hamercado.com/realflow/rb-explosion.mp4

Any thoughts and ideas on how to fix it greatly appreciated.

Cheers!

[Alex]

Hi,

can you try to increase the mass (or density) of the tiny toruses?

It's probably some particles "pinned" below the torus, but it might help. Also check out the torus volume to see if it is precise enough.

By the way. Do not set Caronte quality to 100. Use the default settings reduced to something like 30 or so.

[hmercado]

Hi,
Thanks for the reply.
I have tried different settings for mass on the toruses. Higher mass made them too heavy and the liquid would not move them. With lower mass settings I was expecting them to float but they explode as you saw in the video. For the volume I was using something like 0.02 which made the isosurface look pretty accurate. Maybe I could try 0.01

I have set up the same scene with Hybrido and is working a lot better with no explosions. Will post the finish version later.

Thanks.

[hmercado]

Hi,
Here is the sim with Hybrido which seems to work better in this case.
https://www.youtube.com/watch?v=I81wDwaQJkk

I tried to simulate more frames to fill the container more and see if everything actually floats but when I tried to continue the simulation from the last frame the objects would snap back/reset to their initial position at frame 0.

I am using the option "Use cache" in the command line, but I am getting that problem with the objects resetting to their position at frame 0.

I also tried to make an initial state for the rigid bodies at the last simulated frame but realflow hangs even if I try to do it with only one object.

What is the proper way to continue the simulation for rigid bodies?

Thanks

[Alex]

Hi again,

thanks for sharing your current sim, it really looks cool.

In principle you are not doing anything wrong.

While we try to troubleshoot the issue here, can you check out a couple of things, please?
The teapots and toruses, are they simple objects or multibodies?
What kind of files are you exporting right now? Including animation.sd and BDC files.

Sorry for the inconvenience

[hmercado]

The teapots and toruses were imported with the "Object..." import option, not Multibodies.
I am exporting the ANIMATION.SD and CACHE.bdc as well as the Animaion.sd file for every object and the Wetmap textures for the teapots which did not work for me (all 3 wetmap textures rendered pure black).

Thanks

[Alex]

I see...

A quick test with the same export settings works for me. The initial state for a torus is properly generated.

Regarding wetmaps, they are only compatible with Dyverso and standard particles, sorry.

There are a some workarounds. My favourite is this one:

• Create a Dyverso domain.
• Set it to Cache mode.
• Set the Hybrido domain to Inactive.
• Set the objects to Cache mode. (Important!)
• Make the Dyverso domain node files point to the Hybrido simulation RPC files.
• Connect the objects to the Dyverso domain.
• You can actually use a different copy of the scene for this process, to avoid too much cluttering.

After simulating, the wetmaps should be finally there.

On a side note, I made some quick test using only Dyverso for the simulation. (RealFlow 10 only)
I get some decent behaviour and sim times. This is using the new Rigid material for a second Dyverso domain. A playblast:
https://drive.google.com/file/d/0B-dk8B ... sp=sharing


Being told that, this approach has a similar issue. The wetmaps cannot be computed in a single pass. I can elaborate more in the reason if necessary, but short answer is that a second pass with the same workflow should generate the proper wetmaps.

You can find attached the example scene.

testLiquidSolidDy.flw.zip

[hmercado]

Thank you so much.

I will try to generate the wet maps that way.
I just installed realflow 10 demo so I will try that as well.

I cannot see or download the attached file
It says I don't have the required permissions to view the files attached to this post.

[Alex]

While we try to fix the permissions issue, you should be able to get a copy of the file here:
https://drive.google.com/file/d/0B-dk8B ... sp=sharing

[hmercado]

I could not download from google drive either. I says "The page isn’t redirecting properly"
I tried a similar scene but my toruses are sinking
How do you control the mass of the objects then? With the Dyverso Rigid domain density?