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>
> Let <nx, ny, nz> be the normal of the object before the deformation;
> Let f be the transformation and fx, fy, fz its components;
Something's not clear here... I should have said that f is the
transform that's applied to the *ray*, it's the inverse of the one
applied to the object.
--
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* Settle for a good fantasy. * http://www.enst.fr/~jberger
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