Lightsaber

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Finjogi

I have nice looking lightsaber / spaceship exhaust idea but my math is bit rusty for getting it to work.
Idea is to use just 2 quads, one aligned to base of saber/exhaust and other alignet to viewer. it should produce nice seamingless glow.. anyone to help with math?
Here is mockup of the idea from 3 different point of view:
edit: actually bottom one quads should be rotated 90 degrees.. bit aligment error :)