steven Posted May 8, 2007 Share Posted May 8, 2007 Hey there, I'm wondering if anyone knows of a thread, help card, or quick insight to Birth Groups and Fields. I've got a location POP birthing particles every 100th frame and a force pushing them (simple bursts). I want to put particles into unique birth groups and apply random force values. How do I create unique birth groups? The Birth Group field doesn't accept "group_$F", and I'm not sure how to define a creation rule in a Group POP without creating a group for every frame. Any help? Seems simple but the group fields don't work the way I thought they would. Thanks heaps! Quote Link to comment Share on other sites More sharing options...
steven Posted May 8, 2007 Author Share Posted May 8, 2007 Okay, dug more into the docs, fishing. I'm birthing every 100th frame in my Location POP. The Birth Group is gr_burst and I don't preserve it. Appended a group POP. My Source Group is gr_burst. The Group Name is burst and I do preserve this one. The grouping is set to Rand for sorting into groups. # of Groups is $NFRAMES/100 ( to allow expansion based on timeline) Group Index: floor($F/100) -1 This gives me groups named: gr_burst burst1 burst2 etc. So far, things seems to work. My Drag POP looks at burst* for its Source Group. What would be a good approach to randomizing the Scale parameter based on group index here? One scale for the lifetime of the particles in that group? Quote Link to comment Share on other sites More sharing options...
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