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I wrote this so I could skin a simplified mesh (splitting original into pieces) and transfer weights onto a different mesh with same world positions on the vertices that overlap. I also found this helpful for using a duplicate of skinned mesh to figure out vertices to weight (example using clusters) then transfer those same vertices onto the skinned mesh.
Hope you find it helpful.
/*usage -- //Add script to script path source "naSelectVertsByWorldPosition.mel";
//First select source vertices -- these could be vertices on a split up version of original mesh string $result[] = naSelectVertsByWorldPosition( "DESTINATION_MESH_TRANSFORM_NAME", .05 ) //the .05 says how close in world space to consider to vertices as being matched
select -r $result; //Now Desitnation mesh should have the same vertices selected as source using world position */
cheers, Nate nathananozie dot blogspot dot com
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