Path: utzoo!mnetor!uunet!husc6!cmcl2!nrl-cmf!ames!xanth!helios!jim
From: jim@helios.cs.odu.edu (Jim Duncan)
Newsgroups: comp.graphics
Subject: Re: Mapping algorithm question - NOT cartograpy
Message-ID: <4841@xanth.cs.odu.edu>
Date: 12 Apr 88 15:15:24 GMT
References: <844@agora.UUCP> <522@eos.UUCP>
Sender: news@xanth.cs.odu.edu
Reply-To: jim@xanth.UUCP (Jim Duncan)
Organization: Old Dominion University, Norfolk, Va.
Lines: 30

In article <522@eos.UUCP> jbm@eos.UUCP (Jeffrey Mulligan) writes:
>From article <844@agora.UUCP>, by rickc@agora.UUCP (Rick Coates):
>> A new question:  I am interested in mapping one 2d area into another.
>> The first area may be rectangular, the second a collection of vectors
>> with four points defined as corresponding to the original rectangle's.
>
>This sounds like a projective transformation (determined by four points).
>A projective transformation might be better characterized as taking
>the original picture, moving it around in 3-D, and then taking
>a perspective view of it: .....interesting discussion excised....
>
>> I have seen this done - at SIGGRAPH 85 a French company had some
>> presentation graphics (? I think) running on a Tektronix 4115 that
>> seemed to do this, but I didn't have a chance to play with it.
>
>I have seen an image representing some familiar image processing
>pictures (mandrill, girl with feather) stuck onto the faces of
>a perspective cube.  Someone on the net must know who did that.
>

I can't find the girl with the feather, but the mandrill can be found in the
inside back cover, Color Plates E-J, of Foley and Van Dam, Fundamentals of
Interactive Computer Graphics (the Bible :-).  The pictures are attributed to
Michael Potmesil, Image Processing Laboratory, Rensselaer Polytechnic
Institute.  There is also several views of the mandrill in a demo available
from Sun Microsystems, I believe as part of their NeWS windowing system.

 Jim Duncan, Computer Science Dept, Old Dominion Univ, Norfolk VA 23529-0162
       (804)440-3915     INET: jim@cs.odu.edu    UUCP: ...!sun!xanth!jim
	    "This could be good or bad."  Who said it?  Which RFC?