[Raytrace] oslo lt

[John D. Upton]

John,

At 11:45 PM 4/5/2002 -0800, you wrote:
>model a second surface mirror? I couldn't find a better way, so I had to 
>use two surfaces locked together with zero thickness between. This 
>provides four
>surfaces for one piece of glass. The result seems OK, but questionable. I

     You were on the right track.  A second surface mirror (like a Mangin 
secondary) is entered as three surfaces.

   Surface 1: The glass surface. Enter the curvature & glass type,
              thickness, etc.
   Surface 2: The REFLECT_HATCH surface.  Enter the curvature.  For the
              thickness, use a "minus thickness pickup" of surface 1.
   Surface 3: Use a "curvature pickup" of surface 1.

     I hope that explanation is clear.


John D. Upton
Georgetown, TX
<http://www.atm-workshop.com/>     "The ATM's Workshop"
<http://members.aol.com/RonWin20/> "Ronchi For Windows Home Page"