Xref: utzoo comp.sources.wanted:17299 comp.graphics:18900
Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!mcsun!news.funet.fi!cc.tut.fi!jk87377
From: jk87377@cc.tut.fi (Juhana Kouhia)
Newsgroups: comp.sources.wanted,comp.graphics
Subject: Re: Ray tracing
Message-ID: <1991Jun28.095138.3617@cc.tut.fi>
Date: 28 Jun 91 09:51:38 GMT
References: <383@bibsyst.UUCP> <1991Jun27.184538.6963@ux1.cso.uiuc.edu>
Organization: Tampere University of Technology
Lines: 15


In article <1991Jun27.184538.6963@ux1.cso.uiuc.edu> tmkk@uiuc.edu (K. Khan) writes:
>
>Here's a wild guess: check the focal length parameter in your projection
>formulas. Too short a focal length value will give a fish eye lens look
>to the scene, and cause the distortions you describe.

As somebody else mentioned this too and someone told the thruth that
this is not true.
Focal lenght (or distance of the image plane) doesn't distort
straight lines; I did verify this mathematically.
Hopefully I'm right; this indeed needs imagination to see the
difference from the sphere distortion on the images.
(Sphere's are ellipsoids.)

Juhana Kouhia