I created some 3d models using Sketchup pro (trial).
When I import them to unity I get something like this:
The problem is that I can't add physics to the model by just clicking it on the Project Assets list.
When I go to Components > Physics, they are all disabled, and can't add any of them.
The only way I found to overcome this, was to drag the desired 3d model to the scene, than crete a new prefab, and finally, drag the 3d model from the Hierarchy to the new prefab.
Is this normal, or I'm missing some point?