Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!fluke!ssc-vax!voodoo!zombie
From: zombie@voodoo.UUCP (Mike York)
Newsgroups: comp.sys.sgi
Subject: Re: Overlays, underlays
Message-ID: <580@voodoo.UUCP>
Date: 29 Aug 89 14:28:16 GMT
References: <20790@uflorida.cis.ufl.EDU> <41054@sgi.sgi.com>
Reply-To: zombie@voodoo.UUCP (Mike York)
Distribution: usa
Organization: Voodoo Graphics Project
Lines: 18

In article <41054@sgi.sgi.com> woo@sharona.csd.sgi.com (Mason Woo) writes:
>Commercial message:  Overlays and underlays are currently discussed in the
>first IRIS 4D Graphics course.  Writemasks are not discussed in neither the
>Graphics nor the Advanced Graphics courses, but we are thinking about 
>including them when we revise the courses.

When I took the beginning gl class 4 years ago, writemasks were covered
thoroughly.  Now, when we we get a new person in our group and send them
to the basic gl class, no writemasks.  Writemasks are essential for our
application.  There are things you can do with writemasks in doublebuffer
mode that can't be done with underlays/overlays.  Writemasks should be 
covered in the basic gl class.

-- 
Mike York
Boeing Computer Services, Renton, Washington
(206) 234-7724
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