[away3d] Transparent BitmapMaterial

[wagster]

I'm struggling with the same problem as in this post:

http://groups.google.com/group/away3d-dev/browse_thread/thread/8debf3908238d77a

basically trying to draw a MovieClip onto a BitmapMaterial and place
in on a plane, while keeping the transparent parts of the MovieClip
transparent on the Plane.

...  here's my class

        public class Floor extends Plane
        {
                public function Floor(floorMc:MovieClip,
segmentsW:uint=1, segmentsH:uint=1, yUp:Boolean=true)
                {
                        var bitmapData:BitmapData = new
BitmapData(2048, 2048, true, 0x00000000);
                        bitmapData.draw(floorMc);
                        var floorMaterial:BitmapMaterial = new
BitmapMaterial(bitmapData, false);
                        super(floorMaterial, floorMc.width,
floorMc.height, 1, 1, true);
                        rotationX = 90;
                        trace();
                }
        }

Firstly, I would like to create a BitmapData object the same size as
the MovieClip, but Texture3DProxy throws a "size must be power of 2"
error unless I set both height and width to a power of two, so

new BitmapData(floorMc.width, floorMc.height, true, 0x00000000)

doesn't work.

Secondly, I can't set the BitmapMaterial to transparent = true as
suggested above - because BitmapMaterial doesn't have a transparent
property.

Any ideas?

Cheers,

Wag