Basic Exporting

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In order to be able to do final geometry tweaks / lighting / rendering / animation, we'll need to be able to export from the application into some sort of 3d interchange format.

For Milestone 1.0, we'll need a basic format that can be loaded by other 3d applications. The choices are:

• Use OBJ (Looks like there's a way to embed different meshes in one obj described here.
• Custom format based, say, on json. (Con: need to write a reader for this in maya / blender etc)
• Use fbx / abc which maya can read but for which I doubt there's an easy way to author from javascript
• Write out a custom .ma which maya can read + embed controls (gets us pretty deeply in bed with maya specifically though).

I think we should go the .obj route as a starting point if we can get that mesh separation to work!