3d Rotations in a mask. not working


I’ve hit a wall trying to get this to work:

  • I’ve created a movie clip that contains 14 layers, each layer is a 3D Y-rotation using a motion tween on a movieclip object (just a solid rectangle)
  • Trying to emulate a venetian blind transition effect
  • When I put this “mask” movie clip on my timeline, it won’t allow me to use this as a mask!!
  • I tried setting up the mask in AS3 as well, using imgMC.mask = maskMC;

Does Flash allow this? Can I use 3D motion tweens as masks? it doesn’t seem to allow it. I was hoping maybe I missed something. Appreciate the help.