howto make keystone with Blitz3d?

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Raistlin
 #1
i have a projector at the ceiling of a room.
and projecting the 3d animation to the floor.
but if i put the projector with an angle , the animation on the floor becomes deformed. so i am using projector's keystone function , but it is not good enough.
how can i deform output (keystone) with blitz3d?