To make real shadows a viable option in a full game made in MMF, I really think we'd need some help from a specialised extension, the amount of iteration required just to draw the polygons of the shadow is enough to create some nasty lag which may be fine for an example but is unacceptable once you factor in the additional loads an actual game would put on the processor.
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Stuckboy
The Orphanage: Story driven top down shooter.