This model was created in Cybermotion 3d-Designer which can be downloaded at www.3d-designer.com I noticed that the only other WTC model on Turbosquid was $400, and I don't think that the casual 3-D artist needs a broadcast quality model for their projects. I consider this model fairly realistic, but there are no interior spaces, floors, elevator shafts or surrounding buildings. It is more than adequate for use in amateur 3-D work though. This file includes the north tower only (to save download time) just remove the antenna and copy the tower to add it to the scene.
