Article View: net.graphics
Article #1359Re: Ray Trace problems
From: Brian Matthews
Date: Sun, 03 Aug 1986 18:38
Date: Sun, 03 Aug 1986 18:38
24 lines
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1655 bytes
In article <220@joevax.UUCP> sdh@joevax.UUCP (The Doctor) writes:
|The ray tracer as posted dumps after doing 37.6% of the task,
|returning the error: floating point exception.
You might want to try commenting out the modification of vect->xzl in the
routine scamult in support.c. According to the author, this has given some
people problems, and xzl isn't used anywhere. I didn't have any problems
with the posted data, but when I moved the balls around, it died until I
removed the offending statement. It then generated some very nice output.
|Question: is the resolution of the output supposed to 450 x 450,
|and are the pixels supposed to be non-square?
The pixels are square, and the resolution is 451 x 451. Although it looks
like it goes from 100 to 250 by 1/3, .33333 etc. isn't quite 1/3, so there's
one extra pixel per line, and one extra line. Note that if you change INC in
tracer.c, it will change the resolution.
--
Brian L. Matthews
Computer X Inc. - a division of Motorola New Enterprises
..{utcsri!utzoo!mnetor, uw-beaver!ssc-vax}!cxsea!blm
+1 206 251 6811
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!caip!sri-spam!parcvax!hplabs!tektronix!uw-beaver!ssc-vax!cxsea!blm From: blm@cxsea.UUCP (Brian Matthews) Newsgroups: net.graphics Subject: Re: Ray Trace problems Message-ID: <875@cxsea.UUCP> Date: Sun, 3-Aug-86 14:38:34 EDT Article-I.D.: cxsea.875 Posted: Sun Aug 3 14:38:34 1986 Date-Received: Thu, 7-Aug-86 06:24:43 EDT References: <220@joevax.UUCP> Reply-To: blm@cxsea.UUCP (Brian Matthews) Distribution: net Organization: Computer X Inc. Lines: 24