get coordinates of 3d rotated MovieClip

[friendlygiraffe]

Hi, I have animated a MovieClip using z depth and rotationY. I what to get the x and y coordinated of the top left corner in 2d space.

If i

trace(getBounds(mc.topLeft));
mc.rotationY = 10;
trace(getBounds(mc.topLeft));

outputs:

(x=0, y=0, w=299.5, h=299.5)
(x=0, y=0, w=299, h=303)

Any help appreciated