sascha wrote:
> When using the 'fresnel' keyword in reflections, Linux (Redhat 7.3) and 
> Windows (2000) versions of POV-Ray produce different output!
> This phenomenon caused a strange flickering in an animation rendered on 
> the IMP render-farm (which uses clients with different OS), after some 
> experimentation I discovered that it is caused by the fresnel reflection.
> I wrote a short scene to demonstrate the effect. An image showing both 
> outputs was posted to p.b.images (fresnel.jpg).
> For me the windows output looks "right". Any ideas what could case this 
> effect (a bug in the linux version?), or is something wrong with my 
> material definition?
> Is there a "workaround"?

To me the linux version seems right, it reflects the black background at 
  areas where the reflection coefficient is high.  But in fact if i 
should guess i'd say neither is correct.

The difference is most likely caused by a math function being called 
with parameters out of the allowed range.  Math libraries of Linux and 
Windows handle this differently.


Christoph

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