Damo Posted October 11, 2015 Share Posted October 11, 2015 I have a video file which I have tracked (PFTrack) and imported into Houdini. The video has a bridge in it which I am creating a crude replica for the purposes of creating some collision geometry for a pyro effect. The collision is working fine with pyro, however I want to: Not render the collision geometry (so I deselect it, no problem) Have the collision geometry mask the pryo smoke as if it were rendered in the scene I.e. The smoke starts under the bridge, collides and works its way to the edge then up the side. I don't want to see the smoke until it gets to the edge. but without the geometry shown, it's just on display in the scene. How to I get the geometry to hide / mask the pyro effect? Quote Link to comment Share on other sites More sharing options...
Diego A Grimaldi Posted October 11, 2015 Share Posted October 11, 2015 Force the bridge geo as a matte object in your mantra render node Quote Link to comment Share on other sites More sharing options...
Damo Posted October 13, 2015 Author Share Posted October 13, 2015 many thanks Quote Link to comment Share on other sites More sharing options...
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