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Hi, what is a plausible way to reverse the divergence of particles? The classic example, a glass champagne. After a period of n frames the divergence have to stop cause my wife hate stains on the floor.. ;-) . A Particlesystem is filling the glass. I realiced the foam with popgroup node with the expressioin ingroup = !(@id%10) && @age > 0.35; What is the apropriate way to reverse the expansion of the divergence in the foam group wich was defined in @Cd = 0; @density = 1000; @viscosity = 1; @divergence = 0.0; if(@group_foam) { @Cd = 1; @density = chi("density"); // ch = 9 @viscosity = chi("viscosity"); @divergence = chf("divergence"); // ch = 0.4 if(@age>4) { @divergence = 0; } } After that I give the foam group age dependend a lift on top via a popforce. So I have my foam slowly but surly on top. The problem is that the particles wich was influenced from the divergence stay in place even if the divergence becomes 0 again. I need a way wich leave the volume exypansion of the concerned particles (group_foam) behind - a convergence would be fantastic. Is there a way to do that without another elabrorated sophisticated sim? The concerned particle should behave as they never had a divergence. should I increase the density, hmm, na... foam group wil sink on bottom... the best way would be a mixer but after using it the champagne will taste stale, naa... ;-). AND: Interesting problem how houdini realize the rejection power of the divergented particles. How this perhaps work under the hood? Any ideas for this? Thanks in advance EDIT: found a solution: with a balanced interaction of divergence, density and viscosity its a good solution to simulate foaming and collapsing liquids. Only reamins to solve the real bubbles, its expansion and collapsing paralel to the liquid di- and convergence. Still thea are just particles.
