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This tool is design for effect artist who whish to combine lots of objects for purpose instead of rendering. It is OK to use the Maya default combine tool. But it will be a disaster when combining thousands of fragments or parts by using the default tool. This MEL just simply connect all objects into the polyUnite node without creating the useless transform node for each object like the default combine tool does.
1. select Objects 2. type meshCombineTool in script line
I think it's a handy way to emit particle, fluid, or whatever from fragments. The advantage is that it keep the original hierachy. Also, it playback really fast even combined with thousands of bricks.