The chief of GreyKid Pictures posts here, you should ask him yourself. They definitely pull a lot of the potential out of the program, but as he's said.. it's all about the setup.
Think about what you want the character to do, and then rig for any possibility. There's a lot you can do, and a real runthrough of the forum will show you some techniques that'll bug your eye out. I think a lot of us "old timers" can get a little jaded about the possibilites, we just know.
You'd really have to go through the sample shot by shot (frame by frame?) to list the different techniques used. Their head turns (the holy grail here) are a wonder to behold. What I would say is, learn the basics, and then study the wonders of switch laters and masking. There's (I believe) clearly a lot of individual point animation in there to get around the things that AS can't do itself. But that's just natural, it's software, not an artist. Don't think great work will just
appear.
Well, that was long, wasn't it?
You can can export .SWFs, but not import them yet. I 'spect that'll change sometime.
The teening engine pretty much just works with vectors. To do tweening between images it would essentially be a combo of morphing and bone deformation, and thats so much calculation I think it'll be a while before
anybody does
that. At least not anything like realtime. Someone will probably show up and prove me a liar, but I'm not expecting that anytime soon. There are some tricks you can pull, but automation? No.
That said, there are a wealth of vectorization processes, programs, whatever, that you can use to translate your drawings into something AS
can tween.
A caveat - the most flexible way to tween between different drawings is Switch layers. But because of the way they work internally, they require that that each point corresponds to the others in the switch layer. Practically, that means that if you want to use the point interpolation of the switch layers, unless you're working with incredibly simple drawings, you need to make multiple copies if the same vector drawing so that each vector point corresponds to the one in the other drawings,
and drawn in the same order. It's kinda internal, but each point has an ID. So for switch interpololation, each point referred to by an ID is interpolated between points with the same ID. That leads to two things. First, interpolated Switch layers
MUST have the same number of points. If they don't, no interpolation, period. So that also leads to a bit you can have fun with, if you wanna get all abstract. Each point gets it's ID in
in the order it was laid down, so if you do switch interpolation on layers that were laid down in a different order, but have the same number of points, you can get some pretty interesting effects.
Try this. Create a new switch layer, and a new vector layer in it. Use the Circle tool to make a, uh, circle. Duplicate the vector layer layer. Select the LAyer Properties, and make sure that in the Switch tab that you have "Interpolate Sub-layers" checked.
<rant>sorry, aside - Hey LM, Fahim, et al! Where the heck is our linkable copies of icons that we can link to? It would make explaining things
SO much easier. Really! I have all the tool icons on my site for that, but the Duplicate Layer icon I don't have. And I'd really rather use your bandwidth, it's your doodad and I'm just a user (and fan). Diddle PHPBB and throw 'em in like the smilies, please. Thanks
</rant>
So, anyway, in the first layer use the Add Point

and add a point one one side. The shape of the circle will go all screwy, but who cares. Go to the second vector layer, and set a point on the opposite side of the circle. Goto (oh, jeez, I just can't stop that, I learned Basic as a kid, I do that all the time) frame one. Right click on the switch layer, and choose a layer. Go to a frame after that and choose the other layer. Hit play and watch how those two points move.
I've used this (through planning) to delete a few points in a Switch sub-layer, and then lay them back down in a slightly different order so when the layers interpolate, you get a much different shape. Easy to mess up, but a good trick in the bag.