Yes! This is what I ended up trying. However, there are over 100 
buildings, so I wonder how big the SVG will get in the end. Also, I am 
continually updating the scene, so I really need some way to automate 
the process so I don't have to repeat all this work each time. I am not 
sure Inkscape can be run from the command line, or what other tool I 
might use instead.


Thanks!

Michael


On 2/17/2020 4:20 PM, Alain Martel wrote:
> If you can render the objects separately, you can get a silhouette by 
> rendering the object with finish{ambient 0 diffuse 0} against a white 
> background. Or, render with +q0, a black pigment and a white background.
> If you want a white object against a black background, then, you can use 
> this:
> pigment{rgb 1}finish{emission 1}
> Or, +q0, a white pigment and black background.
> 
> For both options, you don't need any light.
> 
> Then, in Inkscape, you can use that image to generate that outline. You 
> may also use a contour filter as another way to get a line around the 
> object.
> 
> Only work for the object seen from a specific direction.

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