kleer001 Posted May 24, 2012 Share Posted May 24, 2012 I'm probably missing something easy, but here's my setup: I have a dozen small balls dropping down onto a tub of FLIP fluid. The balls have a radius of .25 and a density of 0.00001 . My Flip fluid has a density of 1,000,000 and a viscosity of 10,000,000. And yet when I drop the balls into the fluid they drop to the bottom. Wtf? Shouldn't they float on top? Is the illusion of surface tension messing me up? How do I get RBD objects to float on FLIP fluids? See attached Houdini 12 file for the cause of my tears. bouyancyTest_01.hip Quote Link to comment Share on other sites More sharing options...
kleer001 Posted May 24, 2012 Author Share Posted May 24, 2012 Got it! Go to the FLIP solver -> Solver (tab) -> Feedback Scale Also, I didn't actually have the viscosity and density on my emission object. Facepalm. Quote Link to comment Share on other sites More sharing options...
johner Posted May 24, 2012 Share Posted May 24, 2012 Got it! Go to the FLIP solver -> Solver (tab) -> Feedback Scale Also, I didn't actually have the viscosity and density on my emission object. Facepalm. Glad you found that. There's certainly an argument that Feedback Scale should be non-zero by default. With Feedback having an effect you might dial down some of the physical settings you have. Very dense and very light objects interacting are a recipe for simulation instability. 1 Quote Link to comment Share on other sites More sharing options...
kleer001 Posted May 24, 2012 Author Share Posted May 24, 2012 AND... use RBD for your rigid solver engine. Bullet will just drive you nuts. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.