> I would like to build an image that a laser beam penetrates and
> focused into a piece of glass. I tried to express the laser beam
> as a transparent object with emission. The following is a source
> code for that. Please try #declare GLASS=1 and GLASS=0 and compare
> the images. The result has two problems:
> 1. Laser beam is hardly visible inside the glass, even if the part
>     of laser beam of the glass is cut using CSG.
> 2. The usage of CSG gives a distinct outline of the beam, which looks
>     strange.
> Could you please tell me how to solve the problem?
>

Normaly, for a laser, I prefer to use a light_source with the parallel 
and cylinder attributes and use some scattering media to make it 
visible. Make sure that the "target" object is hollow so that it to will 
contain the media.

Then, do a photons scene.


Alain

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