Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!njin!princeton!phoenix!markv
From: markv@phoenix.Princeton.EDU (Mark T Vandewettering)
Newsgroups: comp.graphics
Subject: Re: MTV raytracer and Eric Haines test nff files
Message-ID: <10046@phoenix.Princeton.EDU>
Date: 22 Aug 89 16:33:39 GMT
References: <561@celit.UUCP>
Reply-To: markv@phoenix.Princeton.EDU (Mark T Vandewettering)
Organization: Princeton University, NJ
Lines: 30

In article <561@celit.UUCP> billd@celerity.UUCP (Bill Davidson) writes:
>I sent mail to Mark V about this but I never got an answer (I'm
>not absolutely sure he ever got my mail since it bounced with the
>first two addresses that I tried, the third didn't bounce but it
>may have fallen into email hell).  Anyway, I'm trying to run ray on
>the nff files generated by Eric Haines programs as distributed
>from uoregon.  The aspect ratios seem screwed up in general but
>especially on cylinders and cones.  I'm not sure if it's a problem
>in the ray-tracer or in the nff files.  Anyway, anything circular
>which is oriented horizontally will be stretched out.  I'm computing
>these things in a square field with square pixels.  Anyone out
>there know how to fix this (is there a way to set aspect ratio
>somewhere?).

I never received any mail from you, but since I read this group
normally, I'll take time here to respond.  It has just recently come to
my attention that my cylinder code is buggy, causing things to be quite
oddly distorted.  I must have introduced this bug prior to my posting,
because I will swear that I tried this stuff out (yeah right mark, uh
huh, tell it to the judge)

In any case, I am working on a bug fix, but am pretty busy.  When I have
fixed it, I will post the bug fixes.  I will also make a new version 
available from cs.uoregon.edu, which will also include the patches
submitted to me by Eric Haines (thanks Eric, why didn't you catch these
:-)

There must be renewed interest in my raytracer after Siggraph :-)

Mark