Article View: net.graphics
Article #1398Re: Ray tracing questions
From: Robert Skinner
Date: Mon, 25 Aug 1986 20:46
Date: Mon, 25 Aug 1986 20:46
21 lines
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1543 bytes
>
> 10.) This question is concerned with the method of antialiasing used by
> Whitted. Michael Sweeney, in his master thesis, stated "that the four
> corners of a pixel are considered to be the same color if the sum
> of the differences in their red, green and blue components is less
> than this threshold (the threshold being a value specified by the
> user)". Could someone please show me how the sum referred to by Sweeney
> is derived, given his explanation?
I have seen some of Sweeney's code, the threshold defaults to 40.0 (out of
3*256), but can be specified as a program option.
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!lll-crg!lll-lcc!pyramid!nsc!saber!skinner From: skinner@saber.UUCP (Robert Skinner) Newsgroups: net.graphics Subject: Re: Ray tracing questions Message-ID: <2036@saber.UUCP> Date: Mon, 25-Aug-86 16:46:05 EDT Article-I.D.: saber.2036 Posted: Mon Aug 25 16:46:05 1986 Date-Received: Tue, 26-Aug-86 00:38:33 EDT References: <386@lll-lcc.UUCP> Distribution: na Organization: Saber Technology, San Jose, CA Lines: 21