Mac OS X QuickLook supports the Collada interchange format with
.dae file extension out of the box.
Is there a free or cheap (< 5 USD) QuickLook plug-in, maybe part of a viewer application, that is capable of formats like
How hard would it be to write or adapt an existing one? SketchUp/3D Warehouse
.kmz files, for instance, are
.zip archives that contain a
.dae file among other stuff. Also, there’s a FOSS project, Meshlab, that should contain the required parsing code for a lot of formats.