Birth Particle from group center?

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This seems like such a simple thing yet i can't seem to figure it out. simply put i have an object that is broken into many different pieces. Using the conectivity and partition nodes i have since grouped these. Now i want to birth a particle from the center of each group, do some stuff in the pop net and then attach that animation back to each group. Any help would be greatly appreciated.
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Joined: July 2008
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Just worked up a quick example for this. The foreach SOP runs an iteration across all of the groups, based on a group mask, adding a centroid to groups based on color. I should work up a nicer file, showing fracture group centroids, rbd groups, numhit centers etc…

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groupcenter1.hip (92.0 KB)

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