When you author a movie using the 3D UI in Flash Authoring, actionscript is inserted into your movie to set the Matrix3D of each of your 3d MovieClips on each frame. That is the 13k mr Cipolloni is referring to. This code is only necessary for 3d animation created via the Flash Authoring UI.

Is that true? Surely there must be some sort of native execution of the division by z. I can’t see how one could do pixel-perfect-perspective-correct texture mapping, at the rates FP10 achieves, without such. I clocked drawTriangles() drawing 1600 texture mapped triangles, within a 400 x 400 window, being rendered at 20 fps. Can that be done in AS3 outside of the Flash10 3D API?

Regarding Ypmits question about the width/height: The same problem occurs in 2d. width/height have an unfortunate historical definition of being the width and height of the bounding box in parent relative coordinates, not local-to-the-displayObject coordinates. That means they change as you rotate. Try the same code in 2d with a rectangle. As you increment the .rotation, the width and height will change. In your case, you are getting the screen dimensions of the rect on stage where your circle is drawing. Silly, but the 3d definition has to work the same as the 2d definition has always worked. If you want the local space dimensions, use getRect()/getBounds() relative to yourself.

to get this right you would have to output 2 images possibly that were angled for each eye and there relative position to screen or object whatever… probably tough on current screen technology. are 3d objects in flash being rendered through multiple viewports to imitate this? if thats even possible.