Very interesting, thank you for sharing.
You should submit all of these examples to the POV team as part of the 
documentation.



> Attached image was achived with iso_csg library. This time isosurface use
> function with following syntax:
> 
> #local f_V=IC_Intersection2 (
>   IC_Threshold( IC_Char("V") , .4 ) ,
>   IC_Scale( IC_Threshold( function{pattern{brick}} , .5 ) , .1 )
>  );
> 
> Threshold around character was used to move surface of letter outside of
> shape. Rounded version of iso_csg was used so edges after threshold are
> rounded. Threshold around pattern was used to show value of pattern used
> as surface. Simple yellow pigment used. Calculated max_gradient was
> 3999.456 but 884 used.
> 
> Any comments ?
> 
> ABX

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