> Alan Walkington wrote:
>> 
>> I am trying to emulate an optics table.  I need narrow cylindrical beams of
>> light, that reflect off mirrors and refract through lenses and interact with
>> the media in a 'fog box'. I am /almost/ there.
> 
> Use a point light, put it into a slotted box. That's what I did.

I usually have a very distant spotlight with projected_through on some near 
object. That makes it *almost* parallel but then it's possible that POV 
might "miss" the projected_through object and shoot no photons into the 
scene at all... There's usually some happy medium though! :-)

-- 
light_source#macro G(E)sphere{z+E*y*5e-3.04rotate-z*E*6pigment{rgbt#end{
20*y-10#local n=162;1}#while(n)#local n=n-.3;G(n)x}}G(-n).7}}#end//GregE

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