[ODE] New tri_tri_intersect

[Nguyen Binh]

Howdy Pierre!

      Did you notice the code here:
      http://www.acm.org/jgt/papers/GuigueDevillers03/

      With my profile result, it outperform the code by Moller (it
      need almost 60% of time compare to Moller's ).So it might be
      good to put it in your OPCODE.

-- 
Best regards,

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   Nguyen Binh
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