wick3dParticle Posted June 8, 2008 Share Posted June 8, 2008 Hello All, I am fairly new to Houdini, and pretty new to RBDs. I would like to create an effect where I have a ceiling collapse in. I have a setup where a non-renderable sphere is flying through the grid. I have gravity affecting the overall simulation. What I would like to do is filter out some of the objects in the RBD fractured object from the influence of the gravity if they are not colliding directly with the sphere. Similar to how I would filter them out with Groups in Sops. I am attaching my wip file for you all to take a look at and possibly point me in the right direction. I appreciate the help, Ilan ceiling.hipnc Quote Link to comment Share on other sites More sharing options...
GallenWolf Posted June 10, 2008 Share Posted June 10, 2008 For those blocks that you do not want in the sim - just delete them before you sim those that you need to crash through? Also look at the RBD Glue object. May help ya there. GW Quote Link to comment Share on other sites More sharing options...
wick3dParticle Posted June 10, 2008 Author Share Posted June 10, 2008 Thanks for the reply Alvin. Deleting the geometry worked. I also tried the RBD glue, but it seems to sim the deleted geometry as well...It is working correctly with the RBD fractured object though. I am just wondering if that is the only way to exclude geo from specific forces in a sim, or is there a way to filter out certain groups within dops? Thanks again! Ilan Quote Link to comment Share on other sites More sharing options...
GallenWolf Posted June 10, 2008 Share Posted June 10, 2008 (edited) If you only want to exclude specific forces from a particular object, look at the object mask on the force. By default it should be set to * (i.e. all objects above), you can do stuff like * ^rbdobject1 so that everything except rbdobject1 has that force. HTHs! GW Edited June 10, 2008 by GallenWolf Quote Link to comment Share on other sites More sharing options...
wick3dParticle Posted June 11, 2008 Author Share Posted June 11, 2008 I see. Thanks a lot Alvin, you have been very helpful! Ilan Quote Link to comment Share on other sites More sharing options...
GallenWolf Posted June 12, 2008 Share Posted June 12, 2008 Glad to be of assistance Quote Link to comment Share on other sites More sharing options...
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