alexandrupre Posted March 24, 2014 Share Posted March 24, 2014 Hi everyone, I'm quite a beginner in Houdini, so maybe someone can help me with this issue. I'm trying to create an erupting volcano with Flip Fluids (the lava, not the smoke), so I modeled a geometry which I'm trying to use as a collision in the DOP network. Now, when I'm trying to use the fluidsource SOP I get some weird artifacts and can't really manage to get a decent collision SDF volume. One thing I've noticed is that the new VDB volume is really fast and gives me a very good result, but even after I've used vdbconvert to convert my VDB to a default houdini volume I couldn't use it as a collision in DOPs using the sourcevolume DOP. (Please check my attached pics.) Are there any tips on how should I handle this problem? Is there a way to make this VDB volume usable by DOPs or ar there some parameters I can tweak that make the fluidsource SOP output a good collision volume? Thank you. Quote Link to comment Share on other sites More sharing options...
tricecold Posted March 24, 2014 Share Posted March 24, 2014 (edited) at the VDB from polygons tool, change the name of the vdb to collision, then in the source fluids, select the preset settings for collision and set the volume to -1 and try again Edited March 24, 2014 by tricecold 2 Quote Link to comment Share on other sites More sharing options...
alexandrupre Posted March 24, 2014 Author Share Posted March 24, 2014 Setting the volume to -1 solved the problem. I already thought about changing the VDB name from surface to collision, but I still wasn't getting any results Thanks a lot. Quote Link to comment Share on other sites More sharing options...
alexandrupre Posted March 24, 2014 Author Share Posted March 24, 2014 OK. Now i have another problem. I'm using a sphere as a FLIP source, trying to fill the volcano's hole, so it can overflow. Unfortunately as soon as the liquid reaches the top of the spheres it will kill particles so it mainly stays at that volume. I don't really know how to explain this better so I added an hipnc file. Just preview some 70-80 frames of the AutoDopNetwork. Is there a workaround this problem? How can I make my volcano overflow? Thanks a bunch. volcano.hipnc Quote Link to comment Share on other sites More sharing options...
pezetko Posted April 5, 2014 Share Posted April 5, 2014 You have very small initial velocity on the particles, the gravity pull them down before they have chance to leave the volcano. Crank the velocity up to something like 10 and you will see diference. Quote Link to comment Share on other sites More sharing options...
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