Thank you a lot for the reply! Indeed, the problem was with the files generated
via external program, so not related to POV-Ray.

Thank you again,
Best wishes,
Hanna

"jr" <cre### [at] gmailcom> wrote:
> hi,
>
> "hanna.baltrukevich" <han### [at] gmailcom> wrote:
> > Hi all,
> > I am a new user of Pov-Ray,
>
> great.  welcome.
>
>
> > and I had this error. I have the .pov file generated
> > from the other program, but when I try to render it in POV-Ray, I get the error:
> > "Parse Error: Expected 'numeric expression', undeclared identifier 'nan' found
> > instead". Did anybody solve this issue already? Thank you a lot in advance.
>
> just a "shot in the dark", but could it be that the generating program, for some
> reason, cannot compute some value and outputs a "Not a Number" result ?  it
> might help if you could post the scene, or the relevant bits from it.
>
>
> regards ,jr.

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