The POV-Ray Reference for vcross should say it chooses the direction of the
result according to the left-hand rule. It currently (3.6.1) says "The
resulting vector is perpendicular to the two original vectors and its length is
equal to the area of the parallelogram defined by them."
Suggest appending "The direction of the result vector is chosen according the to
left-hand rule, so that vcross(x, y) is z".
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