Here’s a great way to bring editable 3d models into photoshop for product mockups and other digital compositing:
Photoshop® CS3 Extended Plug-in for Google 3D Warehouse is a free plug-in that enables you to search and download 3D models from Google 3D Warehouse? directly from Adobe® Photoshop CS3 Extended.
the plug in will give you this new 3D toolbar in photoshop for rotating and altering 3d models. After you open a 3D model you can change the model’s position, camera view, lighting, or render mode, create a cross-section view, or play animation contained in the 3D file. To create these changes, you use the Photoshop 3D tools.
BUT FIRST you must download the free plug in for CS3 extended Google 3D Warehouse
Once you have downloaded the plug-in, you can search Google 3D Warehouse from Photoshop CS3 Extended by going to File>Automate>Search Google for 3D Model.
search for a file you want + download it (everything from pop cans to cars to greek temples!)
NOTE> all of this will be changing + updating in the new CS4 software!