I've been trying to accomplish something unusual on xna. I want to render two images simultaneously in a checkerboard pattern; basically each pixel is represented by a space on the checkerboard and image 1 is drawn in all the  red squares and image 2 is drawn in all the black squares. The intent is to produce a stereoscopic or 3d effect. I've heard something like this can be accomplished with transparency, where you draw a black checkerboard and then a white checkerboard (pixel by pixel) and make black transparent in image 1 and white transparent in image 2. Does anybody have any advice on this?