Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!uoregon!markv
From: markv@uoregon.uoregon.edu (Mark VandeWettering)
Newsgroups: comp.graphics
Subject: Re: Ray tracing refraction
Message-ID: <3674@uoregon.uoregon.edu>
Date: 31 Jan 89 20:46:54 GMT
References: <0XryqWy00Uo1875Ud-@andrew.cmu.edu> <101880003@hpcvlx.HP.COM> <27839@ucbvax.BERKELEY.EDU>
Reply-To: markv@drizzle.UUCP (Mark VandeWettering)
Organization: University of Oregon, Computer Science, Eugene OR
Lines: 16

In article <27839@ucbvax.BERKELEY.EDU> jwl@ernie.Berkeley.EDU.UUCP (James Wilbur Lewis) writes:
>In article <101880003@hpcvlx.HP.COM> tomg@hpcvlx.HP.COM (Thomas J. Gilg) writes:
>>Question : is the index of refraction linear with repect to the
>>wavelength ?  I started writting a ray tracer and took liberty in
>>assuming linear response.  Any experts out there ?

	Well, not me, but I do have a couple of papers by F. Kenton
	Musgrave, who has modified a raytracer to implement _dispersion_
	for effects like rainbows.  He uses a form of stratrified
	sampling over the frequency range. 

	In the January IEE CG&A, there are some pictures done with the
	system, and they look pretty good (read: much better than my
	raytracer :-).  

	Perhaps Mr. Musgrave could comment?  Are you there?