Path: utzoo!attcan!uunet!clyde.concordia.ca!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!usc!chaph.usc.edu!koh-sun3.usc.edu!gcrum From: gcrum@koh-sun3.usc.edu (Gary Crum) Newsgroups: comp.graphics Subject: Re: 4D Visualization Message-ID: Date: 13 Feb 90 22:21:48 GMT References: <99@emtek.UUCP> Sender: news@chaph.usc.edu Organization: University of Southern California Lines: 21 In-reply-to: steveh@emtek.UUCP's message of 5 Feb 90 19:59:04 GMT At the 1988 Computer Graphics Symposium in Ft. Collins CO presented by Hewlett-Packard, Cliff Beshers (beshers@cs.columbia.edu) demonstrated "Interactive 4D animation". He displayed the 2D projection of a 4D cube being manipulated in real time. The manipulation included rotation about 4 basis axes, but no translation, mind you -- coordinates were run through the transform pipeline of an HP Turbo-SRX twice in order to do the 4D->3D->2D projection, and since the hardware supports 4x4 but not 5x5 matrices... Shading was used to help the visualization, I recall. Also demonstrated was "Ray-tracing with polarization" by David Kurlander and Larry Wolff. They and Cliff Beshers are apparently students of Steven Feiner (feiner@cs.columbia.edu), who presented "Knowledge-based graphical interface design" at the symposium. I don't see any papers about the demos in my proceedings. They were both fascinating demonstrations of things I and I'm sure many others have thought about. My question for them was "Have you considered doing 4D ray-tracing with polarization?" :-) Gary