Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!bu.edu!bucrf11.bu.edu!tjh
From: tjh@bucrf11.bu.edu (Tim Hall)
Newsgroups: comp.sys.sgi
Subject: Blending across a polygon
Message-ID: <83407@bu.edu>
Date: 7 Jun 91 19:25:08 GMT
Sender: news@bu.edu
Followup-To: comp.sys.sgi
Organization: Boston University
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On our GTX-B, (no destination alpha planes) specifing a different alpha
value at each vertex of a polygon doesn't seem to work.  (This is, of course, using an apprpreate "blendfunction")  For example, the polygon should go from being completely transparent at one vertex to completely opaque at the other vertex.  The GL seems to want to interpolate the alpha values when the
alpha values of the first two verticies differ.  It's close, but no cigar.  Changing the alpha values on subsequent verticies has no effect. So is it the 
GL or should I get my eyes checked?

Oh, the machine is running 3.3.2.

-- 
-Tim Hall
tjh@bu-pub.bu.edu

Across the sea, lies the fountain of renewal, where you will see, the 
whole cause of your loneliness, can be measured in dreams... -DCD