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OBBs intersection volume

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in what form? as a set of polygons?

if it's polygons you want, you clip the polygons of one box with the other box, and vice-versa.

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An OBB-OBB intersection is complicated enough that you're probably best off just using general CSG routines.

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Thanks,

I want it as a set of polygons.
I thought up an algorithm as following.
Is this correct?

1. Find all OBB vertices that are contained in the another.
2. Find all intersection points between the OBB edges and another's facets.
3. Compute the convex hull of those vertices.

I think there may be a more efficient algorithm
that compute the intersection volume of two polyhedra...

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