Blitz3d deforming output (Keystone)

i am using Blitz3d programming language. but i want to deform the output (i want to make keystone) i am using a projector and projecting the animation to the floor from ceiling . but when i put the projector with an angle, the output video is deformed. so i want to deform the output of Blitz3d animation and will get the correct display. but i dont know how to do it with blitz3d .. i want a sample or an idea.. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform windows xp