[Fwd: [Raytrace] Re: A useful sequence]

[Hermit]

Peter.  I am starting to think that your mailer has inserted my address
in where the list address should be. ;-) Might want to check the address
book listing.

-------- Original Message --------
Subject: [Raytrace] Re: A useful sequence
Date: Fri, 14 Dec 2001 01:19:35 -0500
From: Peter Chen <chen@stars.gsfc.nasa.gov>
To: <mailto:@poph-f.gsfc.nasa.gov>

Hi:
	I went through Peter Smith's suggested sequence.  It worked well and
was 
very instructive.
	I had no problem getting up to the Newtonian, Cassegrain, and thru the 
Dall-Kirkham.  However, the optimization routines (Hammer, Golbal) 
would 
not converge when going from Dall-Kirkham to RItchey-Chretien when the 
secondary radius, primary and secondary conics were set to 
'variable'.   After several attempts, I found that if I started from a 
Cassegrain and set the merit function to 'ptv spot size' rather than
'rms 
spot size', it converged.
	 So I guess the lesson is that, in raytracing, it helps to know where
to 
start.  Am I correct?

Regards,
P.C. Chen
  

_______________________________________________
Raytrace mailing list
Raytrace@blackhole.idcomm.com
http://www.atmsite.org/mailman/listinfo/raytrace