Tool for converting 3D Mecanim model to Sprite Sheet

A lot of searching elsewhere has found no refs to a Unity3D tool that, in editor, lets you run mechanim animations on a 3D model (say, some sort of character; or a treasure chest etc) and turn it into a sprite sheet or even a bunch of .bmp files that you could import into a sheet using Unity's importer or other tools like 2D Toolkit.

I of course found GarageGames' Spriteworks but that would lose all the mecanim 'stuff'. I was surprised that such a thing doesn't exist and I don't want to have to write it myself, but I need it :-(

Anyone know of anything like this? Thanx.