Hmm.. I'm not positive of the precedence rules in Python, so you might need to do:

vnorms[vi] = ~(vnorms[vi].scale(numNorms))<br></br>
...instead of:

vnorms[vi] = ~vnorms[vi].scale(numNorms)<br></br>
...the parens would make sure that the scale() operation happened before the normalizing - in either case, it's more clear to the read what you 'want' to happen (once they understand that the ~ operator is being used to create a unit vector, at least) :).

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