> In POV SDL you can overlap or intersect blocks. For instance something like the
> following code would be valid:
>
> pigment
> {
>   #if (true)
>     color rgb x
>     }
>   #else
>     color rgb y
>     }
>   #end


What about collapsibility for conditional directives?  For instance, the if
could be collapsed and show below the pigment, but if the pigment were
collapsed, it would hide the conditional portion.  Maybe...



-Reactor

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