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Originally Posted by Colt45
Whenever light hit them and they rotated, it created a decent looking "glow" effect, but nowhere near as cool as the rotoscoped final versions.
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To elaborate: What they tried to do was set up a 45-degree reflector in front of the camera, with a bright light attached to the side. The motorized, spinning saber prop was coated with ScotchLite material-- the same stuff used on freeway signs-- which reflects light directly back at its source. The idea was that light would shine back from the sword, through the glass, directly into the camera. The glowing sets and costumes of the Krypton scenes in
Superman: The Movie were shot the same way.
If you check the documentary on the SW DVD, there's a neat outtake where you can see Lucas's reflection in the glass after a take.
Most of what you see in the final version of
Star Wars is the animated (and colored) overlay. The pulsating flicker comes largely from the spinning blade, and I think it makes "Episode IV"s sabers look more dangerous than in the other films, where the effect was purely animation.