On 8/13/2015 2:03 AM, Le_Forgeron wrote:
> Academic answer: use CSG difference on your floor.
> Academic problem: twice the memory is used for the town, and render time
> is slowed. (and town must have an interior, and under-floor road should
> extend their interior toward the sky... maybe doubling the path of roads
> with an invisible container... at least for the troublesome sections
> below the ground)
>
> #declare Town = ...
> #declare Floor = ...
>
> object { Town }
>
> difference { Floor Town }
>
>
>

This would slow things down too much. Too bad I can't just difference 
the objects' bounding boxes.


Mike

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