I imported a 3D apartment model from an Archicad .3ds file.
Scale and coordinates were all messed up and I solved this by resetting location, scale, rotation and origin. Now the model seems fine except that when I press "zoom to all" it zooms out so much that the screen is empty. I figure that there must be something left to original imported scale (0.000001) that is causing this. To find it I planned to select everything visible on my scene and invert selection. Just can't seem to find the function. (The scene has over 250 objects.)