Thomas de Groot wrote:

> The attached image is the render of a prism object (linear_sweep 
> bezier_spline) generated by Inkscape from an image.

If you exported the drawing as image instead of contour you could
use it as height_field with varying heights coded in color (but maybe
not enough resolution for your large city). You could then add your 
terrain height image to make it follow the terrain.

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