Atom Posted March 3, 2015 Share Posted March 3, 2015 (edited) Hi All, I have a fluid object that drops down and sloshes around an obstacle. I also have a FLIP fluid tank in the simulation as well with the fluid level set to -1 so it does not initially appear in the scene. After frame #90 I animate the fluid level in the tank to rise, but there is no interaction with the existing object based fluid that is already in motion. Is there a way to make the rising flip tank fluid interact with the already present object based fluid? Thanks Edited March 3, 2015 by Atom Quote Link to comment Share on other sites More sharing options...
pbarua Posted March 4, 2015 Share Posted March 4, 2015 I have a fluid object that drops down and sloshes around an obstacle. I also have a FLIP fluid tank in the simulation as well with the fluid level set to -1 so it does not initially appear in the scene. After frame #90 I animate the fluid level in the tank to rise, but there is no interaction with the existing object based fluid that is already in motion. By default FLIP Object set to read sop geometry once. You set water level to -1 that means there is not points in tank so Flip Object reads nothing on creation frame. So it doesn't add your animated tank. Quote Link to comment Share on other sites More sharing options...
pbarua Posted March 4, 2015 Share Posted March 4, 2015 Is there a way to make the rising flip tank fluid interact with the already present object based fluid? You need to modify FLIP Object HDA. Select FLIP Object > Right Click > Allow Editing of Contents > (dive inside) > Right Click on Particle Fluid Object > Allow Editing of Contents > (dive inside) > Right Click on Particle Fluid Configure Object > (go inside) > find SOP Geometry (sopgeo2)* which is reading ../convert_to_particles/OUT Now set SOP Path and Time to Set Always. Come back to top level. *sopgeo2 may have different name on your version of Houdini. I'm still on Houdini 13. Quote Link to comment Share on other sites More sharing options...
pbarua Posted March 4, 2015 Share Posted March 4, 2015 One other and probably easiest way to use two FLIP Objects. But that's not efficient and I don't like this. Quote Link to comment Share on other sites More sharing options...
Atom Posted March 4, 2015 Author Share Posted March 4, 2015 (edited) Thanks for the detailed explanation Pradeep. As soon as I changed to Set Always the FLIP system updated and both fluids now act like they are in one tank. Is there anyway to add a little noise just to the rigid flip tank fluid? Edited March 4, 2015 by Atom Quote Link to comment Share on other sites More sharing options...
Diego A Grimaldi Posted March 4, 2015 Share Posted March 4, 2015 You could use an ocean evaluate like Carlos shows here: Quote Link to comment Share on other sites More sharing options...
Atom Posted March 5, 2015 Author Share Posted March 5, 2015 (edited) Thanks for the replies. I ended up just placing a Fan Force right before Gravity in the AutoDop network. I setup a short keyframed pulse on the Force Per Unit Area and changed it to Set Always. This introduces a little bit of turbulence to the default static FLIP tank. Edited March 5, 2015 by Atom Quote Link to comment Share on other sites More sharing options...
Diego A Grimaldi Posted March 5, 2015 Share Posted March 5, 2015 That works too...There are always several options for doing things in houdini Quote Link to comment Share on other sites More sharing options...
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