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Tim Nikias wrote:
> Hm, what to do, what to do... I'd sure like a solution to the problem. Since
> then I've found of course that it seems that every now and then, when you
> use vaxis_rotate without an actual axis (<0,0,0> ain't an axis), it returns
> something that POV-Ray will write as <1.#QNAN,1.#QNAN,1.#QNAN>. Not all the
> time, and even with the same scene, same seed and same settings, it doesn't
> reproduce. It's weird thought that I can still do vcross-calculations, check
> the length using vlength to ensure the matrix has unit-length vectors and
> some other stuff with that "QNAN-Vector", but just when I write the file, I
> write something that I can't read...
> 
	Yes, NaN values may still be used in any following floating point
operations and the result will then be NaN whatever the operation
and the other operands (except for tests). I think there is a way to
cause a program to fail in this case, but I can't remember what it
is (and it might require a modification of the source code).

		Jerome
- --
+------------------------- Jerome M. BERGER ---------------------+
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