do you have the double_illuminate keyword with your object?

have a look here:
http://www.povray.org/documentation/view/3.6.1/329/

I once had similar problems with some heightfields and could fix it using
double_illuminate

Regards
Joerg



> High!
> 
> When rendering several views of a simple isosurface landscape (with 
> hetero_mf being used as main function), a strange effect occured: 
> shadows are cut by straight lines like indicated by the red arrows in 
> the attached picture. I remember having read about this problem here 
> several months before here, perhaps even in 2006, but I couldn't find 
> the respective posting...
> 
> Is there a way to fix this?
> 
> See you on www.khyberspace.de !
> 
> Yadgar
> 
> Now playing: Don't Work That Hard (Scritti Politti)
> 
> ------------------------------------------------------------------------
>

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