Just set 'max_trace 5' in your isofunction. I haven't tested it now but
I think this should do it. (See MegaPOV Docs 5.2.5 CSG-Operation).
> 
> #if (Main)
> intersection {
> isosurface {
>     function {Func(x, y, z)}
>     threshold 0.5

-->    max_trace 5

>     contained_by {
>          sphere {<0,0,0>,4 }//box {<-4,-4,-4>, < 4, 4, 4>}
>     }
>     texture {tex1}
>     scale 0.5
> 
> }
> object {X texture {tex1}hollow}
> rotate z*45}
> #end

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