Some CAD programs don’t add any kind of mapping to the 3D models and this is a problem for texturing later on.
I would really like for Rhino to have a simple stack-all-mesh to the unwrapper in scale. It does not need to have edges aligned, it just needs to not reuse the map space. This way it will be possible to generate shadowmaps and do analysis on it.
As you can see here the model is just using the corner pixel of the image to color the entire strucure: