Attached Link: http://www.lhup.edu/~dsimanek/3d/3dpage.htm

The cameras should take overlaping pictures with a peparation of about 2 1/2 inches for normal viewing. For macro shots, they should be apart one 30th of the distance of the camera to the subject. For distant views you should separate them more than the 2 and 1/2 inches. They should not be toed in, that is, they should be on the same horizontal axis. You can aim them up or down as long as they are level. For best results, include something in the near foreground, that is not cropped in any way. If you want to show for best advantage, don't show buildings or landscapes head on, but make it so that you have a good variety of objects receeding into the distance. Any other other depth clues, such as haze and color perspective help.