Wasn't it R. Suzuki who wrote:
>1. '|' and '&'
> According to POV-Help 6.5.4.4.1&2, the operator '|' means merge
> and '&' means intersection.
> But these operators don't work properly on beta 8.  
> For example, following isosurface is not the intersection 
> of two spheres.
>   isosurface{
>     function { f_sphere(x,y,z,1) & f_sphere(x+0.5,y,z,1)}
>   }
>
> These were ok on beta 7.
>
>2. 'int()'
> The function 'int()' does not work in isosurface.
> Try the following isosurface. 
>   isosurface{
>      function { int(0.5)}
>      threshold 0.5
>   }
>
> POV-Ray crashes on my PC.
> POV-Ray for Windows 3.5 beta 8, Windows Me, Celeron 600MHz

I confirm these, but will entertain suggestions that #1 might be
mathematically correct as long as the intersection and merge of
isosurfaces now get documented this way round.

-- 
Mike Williams
Gentleman of Leisure

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