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[Graviton <>]

I have two  http://en.wikipedia.org/wiki/Polygon_mesh  polygonal mesh  , with
all the usual properties such as vertex and edge and the faces.

Now I want to conduct an overlay between the two, so what I do is, I create
two arrangements, each for one polygonal mesh, and then use the overlay
method to come up with the resultant.

The problem is, how to construct each arrangement, such that for each face
in the arrangement, I can trace it back to the original face in the
polygonal mesh?  For each face in the polygonal mesh, there is a unique
meaning assigned to it, so the arrangement has to know this when it is
constructed.



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