One of the lesser-known features of OS X 10.6 is the native COLLADA dae file support. You can open a model in Quicklook within the Finder or in Preview.app, the image and PDF previewing app in OS X. If you have a client that’s running OS X 10.6 or higher, they can look at the models, fully lit and textured, without needing a 3D program. It’s like having Acrobat for 3D files:
Just how accurate is it? Look at the exported scene with high-quality preview mode in Maya:
If you don’t have OS X 10.6 or you’re running Windows, Photoshop CS3 and up can also open COLLADA files.