WhyGee

Hi, Is it possible to have an RBD object act as a volume collider, for example against a flip sim but also as a surface collider when colliding with cloth (in the same dop network of course) If someone could provide an explanation or a simple scene setup, it would be of great help. Thanks in advance! YG

unfortunately no, that was just a simple example to explain the problem. The scene itself is more complicated and the cloth is moving around. I need some of it to pass thru wherever it may encounter a collider. I'm looking for something like the wire solver "nocollide" attribute if I remember correctly. Thanks!

Hi Atom, Not sure I understand what you mean, but maybe I wasn't clear. Imagine a table cloth falling onto a table top. I'd like to be able to have half of the cloth collide with the table while the other will pass through it. I want it to be controllable on the cloth and not delete part of the collider itself if that's what you meant? Thanks! YG

Hi, I was wondering if it's possible to disable collisions on a per point level? Thanks YG

Hi, I've searched through the forum and couldn't find an answer so hopefully this isn't a recurring question that I've missed. Attached is a simple scene with a rigid body flying onto a piece of cloth. When the rbd is set to volume collision, it works fine, when it's set to surface, the collision is ignored. Is this a limitation or have I done something wrong? I have done other tests where cloth falls onto an inactive rbd surface collider which worked. Once it has become active and started moving, the collision was ignored either completely or was not correct. The reason I insist on surface collision because in the actual project, there is also other type of dynamic interactions along with particles and flip involved and I need surface collision information on the particles. Perhaps a workaround would be if it's possible to have the same rbd sim interact as a volume for some dynamic objects such as cloth and as a surface for particles and flip. (the flip does affect the rbd, so splitting the sim is not desired) Thanks in advance, Yaniv active_rbd_surface_cloth_collision_test2.hipnc

I agree this effect should be much more straight forward. Thanks for the hip, I'll have a look now to see how it behaves in my scene. The previous file tends to get worse when the sim resolution is finer so I hope your setup will work. Cheers Yaniv

sure collisionWeights_v001_jlim_fill_test1.hiplc

Hi again, I've ran both setups and there is still an affect on the fluid as it passes through. I've tried playing with the thresholds but unable to get rid of this behavior and it ruins the smooth stream as expected if the container was actually opened at point of entry. Included is a preview of what I mean. If you have an idea how to fix this it would be great. Otherwise looks like the 2 stream approach is going to have to do. Thanks alot! Yaniv fill_test_v1.mp4

I think I've found where you've integrated cWeight. I'll try to add this to the new solver hopefully I didn't miss any other changes. Thanks again.

Could you please explain what you've changed inside the flip solver? It seems to be from pre-H16 and I'd like to re-implement it in the new version's solver. Thanks!

Thanks so much guys! Really helped me out on this one Cheers Yaniv

looks promising galagast! Ill check your scene file first thing tomorrow. Great forum, very helpful! Yaniv

Nice tutorial Atom thanks alot! Alejandro that sounds like its tge control i was looking gor. Ill give it a shot in the morning. If u find the setup file that would be amazing. Appreciate all your help guys. Cheers

Perhaps I wasn't clear on the intention but that's not the effect I'm after. Hopefully the attached masterpiece drawing will explain better. I don't want the fluid to flow around the collider, it should pass through as if it doesn't exist, and only collide from within. Maybe you know of a way to turn flip collisions on or off with a group or based on a per particle attribute? That would pretty much solve the problem I'm having. Btw maybe a different kind of topic, but even though flip can collide with surface rather than volume colliders, it doesn't seem to "fill up" the container if it's set to surface. Is that a known limitation? Thanks alot for your help, much appreciated! Yaniv

Thanks Atom, that would be a last resort solution. I'm still looking for a solution that would allow a continuous stream, splitting it up might be a little time consuming for the time I have on this little project. Worst case I'll jump into Realflow as much I'd like to avoid it Thanks again! Yaniv