> For curved structures such as roads and sidewalks, I probably will use a 
> Python script converting GIMP bezier paths into PoV-Ray splines... but 
> more rectangular structures (like most buildings), for the time being, I 
> could do with simple CSG!

BTW, you should familiarize yourself with scaling issues and
floating point accuracy if those buildings are then intended
to be placed on an earth-sized sphere.

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