news:44281e86$1@news.povray.org...
> Those kind of numbers are
> usually generated by the floating point hardware and the code that
> writes them as the string "QNAN" is in the standard C library, so a
> search through the povray code shouldn't turn up anything...
>
> Jerome
>

Ah OK.
Well is there something Tim could do to detect this from within POV-Ray 
before writing it out to the file?

I had one idea. Don't know if it's valid or whether it might be a stupid 
idea, but , if it's an intermittent problem with the FPU (an overflow or 
something), then could he perform each calculation twice and compare the 
results? (either with a numeric comparison or converting the numbers to 
strings)

Chris B.

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