Basically, if you want a foot to stay put from 00:00 to 02:00 you need keys on 00:00 and 02:00 and they need to be "zero-slope" keys. More keys in the middle won't change much about the foot, but if you get some because you've been force-keying the whole model it won't hurt anything.
Probably not. But the same principles apply. if you want the door to stay put from 00:00 to 05:00 you need keys on 00:00 and 05:00 and they need to be "zero-slope" keys.
That's why those came first. Those pretty much make you move the whole body for every key so the advanced concept of keying something to make it stay still isnt' needed yet.
Gotta introduce them sometime. That's what this project does.
ok, I think we've found the problem...