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It is easy to be confused about these two terms – especially since 3D is often used to describe stereoscopic
projection.
Stereoscopy
Stereoscopy uses two images shot from slightly different angles to create the illusion of depth perception. This is, of course, also how our eyes work and allow us to judge distances in real life. In a stereoscopic film objects coming towards the audience will appear to come right out of the screen, an illusion used to great effect in some old monster movies. Stereoscopy in full color requires a dual viewing system with a high quality separation such as shutter glasses. Black and white stereoscopy, or compromised color stereoscopy, can be accomplished using the old cheap two-colored glasses that were popular for stereoscopic movies in the fifties.
3D
3D refers to 3-dimensional computer modeling such as might be used to show what architectural plans will look like when they are built – and they can be viewed from any angle.
Film animation was originally created by hand drawing on paper – a two-dimensional medium. Computer animation can still be done
two-dimensionally, but increasingly filmmakers are using 3D modeling to create complex characters or realistic-looking visual effects. Although the results are still viewed in two dimensions (i.e. on a screen) the computer data includes complete 3D information so that an object can be rotated and examined from any side.
Putting the Two Together
David and Hanna have done both 3D and stereoscopic work. The original 3DEMBRYO project used 3D modeling to create animations that could be tilted and turned to see every detail on every surface
(see gallery). Then they took these models and created dual image streams for true stereoscopic projection.
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Steresocopy: projection
Steresocopy: shutter glasses
3D: Wireframe model used to create 3D images
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