3-D Definitions before you start3-D - Length, width, & depth are three dimensions. 4D - Length, width, & depth & time becomes the 4th dimension when animation takes place... Stereoscopic: A method of blending images of two slightly differing perspective points into a single image giving the impression of depth presence. When viewed properly they allow you to see in 3-D. Example: Stereo cards, View-Master reels etc,... For more on stereo pairs, see the Anaglyph link. Auto-Stereoscopic - Most forms of 3-D, like virtual reality, 3-D movies, Stereo pairs, etc. require some sort of viewing apparatus like goggles, glasses or a viewer. Auto-Stereoscopic is machinery, goggle & glasses free so any passer by with 2 functional eyes can see the 3-D effects. Lenticulars -There is a layer of lenticles (or lenses) in front of the image. They work as a viewer which self adjusts to whatever distance you are from it. If you are looking at 4D, not only does it allow you to see the proper stereo views, but also fluid animation, simultaneously... Stereo- 2 as in a pair. Stereo pairs are two perspectives of an image that lets you see 3-D with glasses, projection, a viewer, or other methods. Anaglyph- A method of viewing stereo pairs with red & blue glasses. Polarized Projection- Another way to view stereo pairs. These glasses appear to have a grayish tint & were invented by Edwin L& of Polaroid.
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