I'm trying to figure out which tool is best to 3d rotate an image on a
plane.
Something like this:
http://karmapop.com/content/cardFlip.swf
but with a dynamically loaded image on the "front" and another image
on the "back" with a font superimposed on it. this is going to be a
postcard.
this is basically a shape tween, but where an image is being distorted.
I want the animation to be as smooth as possible, the file size to be
as small as possible, and keeping it to Flash 7 to allow the most
people to use it.
Sandy
http://www.mosessupposes.com/Fuse/
http://hosted.zeh.com.br/mctween/
Fuse, MC Tween, Laco's Tween or any other tween won't "do" the job.
They're just tweening engines, so they'd only be used when setting the
angle of the thing. Say, from 0 to 360 using different equations.
Useful, but to properly *project* the object, to draw the thing, you'd
need something else. It's not their job.
Papervision3d
Papervision3d and Sandy will do the job *fine*, but from what I've seen
they're meant for Flash 8+ because they use BitmapData to do it.
Something else?
Well, how dependent you are of Flash 7?
To do this on Flash8+, you'd use Papervision3d or Sandy. It's probably
not very painful.
On Flash7, you would need to do the proper 3d transformation *and* all
projection. I don't think there's any 'ready-made' engine for that, so
basically, you'll need to map and rotate all vectors, then project all
triangles using skewing and masks. This is possible, but it's pretty
ugly compared to the easier/faster BitmapData fill.
A similar technique has been used here:
http://www.nkag.co.jp/
You can't see, but each face is made of a bunch of triangles. However,
due to the complexity of the masks, you'll see artifacts once in a
while, and speed won't be exactly the best. The technique used by most
3d engines today is similar, but they simply fill the data instead of
creating movieclips with masks and skewing/scaling them.
So all in all, I'd recommend you using Sandy/Papervision3d instead,
under Flash 8. 90% of the user penetration seems good enough (specially
considering 7 is just a bit more, 95%).
Of course, you just scale your object vertically/horizontally... there
would be no perspective, but sometimes the simplest/easiest way is enough.
And finally, people, please keep this in mind when doing your 3d
rotations and face projections and whatnot:
http://hosted.zeh.com.br/misc/perspective.png
Zeh
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