I know what it should do, (same animation from the same model should always use the same amount of RAM in spite of the format used to store it), but I don't always know what it does. So thanks for the explanation. As for the 3ds animation, I thought you had told me a while back that it reads 3ds animations (and programs like Deep Exploration have a checkbox for "export animation" for 3ds files). Must mean there's animation in 3ds files, right?