[Gridflow-dev] geometry, cross products, matrix inversions...

[mescalinum at gmail.com]

attached is an attempt of doing cross product by computing the skew 
(pre-cross-product) matrix of left operand, and then doing a matrix 
multiplication with the right operand.

it involves a 3x3 times 3x1 inner product, but requires some 
#pack/#unpack trickery.

would you do it in some alternative way?


also, what about computing the adjoint[1] of a matrix?

[1] http://en.wikipedia.org/wiki/Adjugate_matrix

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