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Be carefull with "normalize"
Be aware that if you use the "normalize" function from wm3, it might
give the result (0,0,0) if the norm of the vector is smaller than a
It sounds very strange to me, as I see no reason for this check, and I
was wondering if it could not cause problems in some cases, when a
"normalized" vector has length 0...
Janek had this problem when defining the normal of some triangular
facets (of small size) by normalizing the cross product of edges vectors.
I prefer not to be the only one thinking about this potential problem,
which probably needs a fix.
A few ideas from a discussion with Janek :
1- possibly fix minWm3 so that the test vs. tolerance is removed
2- display a warning to the user when the tolerance is hit and the
vector is "rounded" to (0,0,0)
3- run batch tests with/without the tolerance test
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