bealobo Posted October 19, 2007 Share Posted October 19, 2007 Hi! I'm new to Houdini, I'm learning it and I like it a lot! I think this is my first post, although I read the forum, so hello to everyone. I like effects and work with fluids so I was curious about Houdini fluids and made a couple of tests with the Particle Fluid Solver. So, my question is... When making an inward collision I've tried reversing normals (point SOP) but it doesn't seem to work. Can anyone confirm that it is needed to make a boolean with two boxes for getting inward collisions? Does it take more resources as there is more geometry to check? Or is it not relevant? Thanks! Quote Link to comment Share on other sites More sharing options...
SpencerL Posted October 19, 2007 Share Posted October 19, 2007 On your collision object DOP, under the collision tab, I would tick on Show Collision Guide Geometry. This represents what your fluid is colliding with. Depending on what your collision object is, you may need to turn up division, turn off Laser Scan or possibly tick on Invert Sign. Quote Link to comment Share on other sites More sharing options...
Jason Posted October 19, 2007 Share Posted October 19, 2007 On your collision object DOP, under the collision tab, I would tick on Show Collision Guide Geometry. This represents what your fluid is colliding with. Depending on what your collision object is, you may need to turn up division, turn off Laser Scan or possibly tick on Invert Sign. Another tip; its often not easy to tell if the Collision Volume is inside out or not since they generate the same mesh. The easiest way to check this is to turn on the display of primitive normals in the viewport and check if the normals are facing inward or outward. Jason. PS. It would be easier if the viewport also displayed the true Volume as well and this tinted the inside or outside of the object or something like that where it would be easier to see it at a glance. That should be an RFE for SESI. Quote Link to comment Share on other sites More sharing options...
bealobo Posted October 20, 2007 Author Share Posted October 20, 2007 I'll give it a try. Thank you! Quote Link to comment Share on other sites More sharing options...
Andz Posted October 21, 2007 Share Posted October 21, 2007 Happy Birthday bealobo :balloon: Quote Link to comment Share on other sites More sharing options...
bealobo Posted October 22, 2007 Author Share Posted October 22, 2007 "Invert Sign" did the trick. Thank you everyone!!! And thank you Andz Quote Link to comment Share on other sites More sharing options...
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