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Hello, Ive got a simple RBD scene where I'm blowing out a stone door with a magnet force/SOPgeo with a metaball(I've attached a screen shot of what my DOP tree looks like). The geo is fractured and is a packed rbd bullet solver. My question is how do I kill the rbd geo that goes outside my sim(you can see the spray of smaller chunks leaving the collide geo scene.) I'd like to set up a bounding box that I can envelope my scene and when a geo piece leaves this area is deleted. Ive tried setting up another sopsolver going in it and creating a group bounding box(Envelopes scene) and then a delete node(with group 1 as group) under the dop_geo. Once this is created I jump back out into the DopNetwork and right after my gravity node I put drop another group node with group name killme and expression : npoints($DOPNET+":"+$OBJID+"/Geometry") == 0 into the group 0 expression. Next, I created a delete node under the group node with the object group name: killme. No go. Nothing happens to the spraying geo. Am i barking up the wrong tree or am I close? Need help. Thanks. Just getting up and running so I am new to Houdini. I will provide the .hipnc file and screen shot but there will be missing source geo in file. Hopefully it will help NeedToKillGeo.hipnc