I believe this (great) book has an algorithm that works for concave shapes:

http://cs.smith.edu/~orourke/books/compgeom.html

I'm sure one of the Graphics Gems book probably has something too... I
believe the code to the books is on the Internet.

Best of luck,

Daniel Selman

R K Shyam Prakash wrote:
Hi,
        I have a 3d model represented by a set of triangles. Assuming
that the model does not have any holes in it, is there any algorithm
using which I can calculate its volume? Can some body point me in the
right direction.

Thanks
Shyam

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