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["Sebastien Loriot (GeometryFactory)" <>]

You don't need to compute the intersection, nef will do it 
automatically. Just call "join" on the two halfspheres.

Sebastien.

On 05/21/2013 03:10 PM, ChaoM wrote:
> Hello Sebastien :
>        Before the process of doing the union of 2 nef polyhedra , I firstly
> compute the outside and intersected points, Since I do not know the index of
> the  "outside and intersected points",So I do the Delaunay Triangulation to
> get the index, and after that, I use the union of nef ~~
>      I hope you can understand my idea~
>
>
>
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