Centroid for polygonal mesh

[mark render]

you don´t need the boundig-box node to get the barycenter of a mesh. just center the axis (menu/structure/axis center/axis center) of your mesh (doesn´t matter what shape), this will be your center, which then can be used for positioning your particle.
hope this helps.

[JDP]

If you don't want to move your axis you can loop through all points with an iterator adding their positions together, then divide by the number of points. You can also use the bounding box points.

HTH

[semerkhet22]

take a look here at http://vimeo.com/12810513 he uses a super trick to find the centroid or center of mass using the tracer.

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