This is not an easy task to accomplish in Softimage, but it is doable.
I see two possible avenue I would explore:
1 - What I would try with Lagoa is emitting elastic particles for your
rigid objects and make the elasticity very stiff. Make sure they have an
ID based on the emitted mesh and a transformation relative to that
emitter. Then, at every iteration, I'd figure out a way to average these
particles transforms by ID to create a transform for the rigid particle
group that I would apply to the rigid object. So the particle group (by
ID) moves the mesh. Once you get that average tranform, I would
overwrite these elastic particle positions by multiplying their saved
relative transform by that new average transform and basically bring
them back into a rest state. That'll avoid the rigid mass of particle to
deform by their elastic properties and will allow proper collision for
the liquid particles. You are forcing particle positions so it might
insert some instabilities in the simulation, but I think it should work.
So to recap, you let the elastic group deform and interact with the
liquid group in one iteration. Then you "undeform" the elastic group by
their averages to bring them back to a stable state as if it where
actually rigid. You then simply match the transform of your rigid
objects to that of it's relative group average transform and you keep
iterating.
That's one way.
2 - A second way would be by mixing Lagoa and Momentum. You would simply
simulate the liquid by Lagoa with your Rigid Body meshes as collision
object. So you would need a Deform Bodie with ICE controls, and your ICE
controls would sample the closest Lagoa particles and create a force
based on their average velocities. I think that would be doable as well.
I haven't tried any of these techniques myself, but that's where I would
start experimenting.
Now if you need to do a big flood, you will probably need a lot of
particles to have a nice looking simulation. I hope you have a good
machine with a lot of memory and a lot of patience. Lagoa is best suited
for smaller scale simulation. It's not the best for large scale liquid
simulations. I would look into Houdini or Naiad (if it's still available
after Autodesk bought them) for better and quicker results. Maybe even
Realflow could be a better option. But if staying inside Softimage is a
must, I would explore these two suggestions.
Good luck! Your going to need it.
-Mathieu
Pablo Tufaro wrote:
Well, that may work...!
I will investigate a little bit on that one!
Thanks !
pablo.
El 10/18/2012 4:03 PM, Oleg Bliznuk escribió:
Here is some work on liquid->rbd interaction
http://si-community.com/community/viewtopic.php?f=4&t=281
I think adding backward influence is much more easy task
