viki164

hi Charles , I exactly know what you mean and what you are trying to achieve. For ref have a look at this guys work :

Apologize I don't have anything handy at the moment. The test I did is at work . The setup is quite simple though. I don't have any complicated graph Just few nodes because Pop Grains alone itself does the trick. I made a small geometry patch on the ground plane. Then used pointsFromVolume & Added another AttrWrangle node for randomizing pscale & mass. f@pscale = chramp("pscale", rand(i@ptnum)) * 0.015; f@mass = f@pscale / 0.55; These points were fed to Pop Network as First Source Input. Now inside the Pop you put a Pop Grain Node. The settings for PopGrain to imitate Foam behaviour are : Particle Separation : 0.05 Constraint Iterations : 60 Behaviour Friction : With Colliders : 0.2 With Particles : 0.1 Accurate Friction Checked Static Threshold : 0.5 Scale Kinetic : 4.5 Internal Collision : Weight : 1 Stiffness : 1 Enable Mass Shocking Scale = Local Shock Scaling Power = 100 & Shock Axis : 0 1 0 Clumping : Weight : 2 Stiffness : 0.5 Explicit Constraints : Weight : 0 Stiffness : 100 Target Pins : Weight : 1 Stiffness : 0.5 SOLVER SETTINGS : Max Neighbors : 35 Neighbor Query Scale : 2.75 Max Accelaration : 5 Velcoity belnd : 5 Over Rlaxation : 2 & Open CL is checked ON Just by these settings it should give you the foam behaviour & clumpiness. Add the ground as static collider. I also Added a bit of Gravity : -9.80665 * 0.3 & Pop Wind : // Pass Through wind = wind; airresist = smooth(0, 1, fit(v@P.y, .02, .22, 0, 1)); Amplitude : 0.25 , Swirl Size : 0.5 , Pulse Length : 20.. Just by these few nodes..you might get the foam behaviour. Reference :

Hi Hernan , you got me.. yes its been Six months I did the switch. From SOUP to Houdini..life is much easier & nice. Still learning & exploring. I haven't used the Pop Spin yet ..will give a try. Thanks P.s : Not looking for Per-particle spin instead I would like to spin the clumps !

Hello folks, Newbie here. I am trying to make some foam particles with POP Grains. So far the motion is coming along well what I am missing is the particle spin based on clumps it has formed. In Maya Nparticles the particles rotation is computed dynamically. I wonder if there is a way to do the same with POP Grains & link the rotation or spinning speed based on the clumps. Any Idea or workaround would be great ! Thanks, Vik