Neat tech but people might mistake this as being useful for game development, where it'll be less helpful than useless. Games are about interactions, and this actively works against it. You don't want the model to infer mechanics, the designer needs deep control over every aspect of it. People mentioned using this for prototyping a game, but that's completely meaningless. What would it even mean to use this to protot…
people sell entire franchises off of a few pre-rendered generic-fantasy still images -- I would have to disagree with the premise that this is useless as a visual concept tool.
I agree with your notions about integration into an existing game.