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vnormalize (<0, 0, 0>) isn't matematically defined... but POV-Ray 3.1a
(windows) returns a "perfectly valid" <nan, nan, nan> vector... it's a sin
that there isn't any IsNan() function or something like that to recognize
it. And if i use this vector in any object the perser locks only while
creating light buffers.
I think vnormalize (<0, 0, 0>) should return an error in parsing time, and
POV should be compiled ignoring them.
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