The best way to do a laser beam is to fake it.  Use cylinders with media or
cylinders that have a greater than 1 value for ambient (or a combination of the
two).  Give them "no_shadow" keywords and you will not have "ghost" beams
showing up, only the ones you mean to have.
    I would write a macro that figures out where the cylinders should be and how
much brightness they should have (for the beam splitter, for instance.)

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip

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