Xref: utzoo comp.graphics:14263 comp.sources.wanted:13965
Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!bionet!agate!riacs!hitchner
From: hitchner@riacs.edu (Lewis Hitchner)
Newsgroups: comp.graphics,comp.sources.wanted
Subject: Re: TIN implementation?
Keywords: terrain,modelling,graphics
Message-ID: <1990Nov6.135823@riacs.edu>
Date: 6 Nov 90 21:58:23 GMT
References: <1990Nov2.140331.1235@chx400.switch.ch>
Sender: hitchner@riacs.edu (Lew Hitchner)
Reply-To: hitchner@riacs.edu (Lewis Hitchner)
Organization: Research Institute for Advanced Computer Science
Lines: 41


This is a reply that I attempted to email directly to the author.  Our
mailer returned my message to me with a "host unknown" error.  So, I
apologize for posting it here, but maybe some others will find some useful
information as well.
--------------------

	Date: Tue, 6 Nov 90 13:44:14 PST
	From: Lew Hitchner <hitchner>
	To: metz@bolek.iam.unibe.ch (Igor Metz)
	Subject: Re: TIN implementation?

	We attempted to implement TINs (based upon the paper by Fowler and
	Little in SIGGRAPH '79) this past summer.  The work was done by a
	summer student, but he did not complete it nor get anything debugged
	before he left to go back to school.  Thus, I cannot offer you any code
	as your news article requested.  But, if anyone else responds to your
	request, could you please forward the message to me?

	By the way, there has been some more recent work done on this by
	Pavlidis and a colleague who is now working at Grumman Data Systems in
	New York (a U.S. manufacturer of flight simulators).  I heard a
	presentation of their work recently at the Visualization '90 conference
	in San Francisco.  You may request a copy of their conference paper
	"Hierarchical Triangulation Using Terrain Features" and a longer
	technical report from

		Ms. Lori Scarlatos
		Grumman Data Systems
		1000 Woodbury Rd.
		Woodbury, NY 11797, U.S.A.
	(sorry, I don't have an email address for her).

	They extended the work by DeFloriani (Computers and Graphics, 1984 and
	IEEE Computer Graphics & Applications, 1989), and claim that their
	results give a better fit to the original digital terrain grid with a
	smaller number of triangles.

		Lew Hitchner
		RIACS at NASA Ames Research Center
		Moffett Field, California  (near San Francisco)