This command exports 3D objects in the unified view or active layer to .dae format. The .dae file and any texture image files associated with it are placed in a folder named after the .dae file. This format may provide better results than the older 3DS file format.
To export a COLLADA file:
Select File > Export > Export COLLADA (3D only).
The Export COLLADA Options dialog box opens. Specify the parameters and click Export.
► Click to show/hide the parameters.
Specify the export file name and destination, and then click Save.