Path: chuka.playstation.co.uk!news From: Christoph Luerig Newsgroups: scee.yaroze.programming.3d_graphics Subject: Re: Vectors and Matrices Mini Tutorial Date: Fri, 10 Jul 1998 11:20:49 +0200 Organization: PlayStation Net Yaroze (SCEE) Lines: 46 Message-ID: <35A5DCF1.10D9E988@immd9.informatik.uni-erlangen.de> References: <35A25BBF.F272A126@scee.sony.co.uk> NNTP-Posting-Host: faui90.informatik.uni-erlangen.de Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="------------D59C183B6114600E065B9AF6" X-Mailer: Mozilla 4.04C-SGI [en] (X11; I; IRIX 6.3 IP32) --------------D59C183B6114600E065B9AF6 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Hello James! Out of curiosity, 4x4 matrices with homogeneus coordinates are quite common in computer graphics (see OpenGL), as they are the only way to formulate homogeneus transformationns as projection for instance. The Yarozee DevKit does not provide any functionality to influence the projection except for the GsSetProjectionDistance or something like this. Does the Playatstion also internally use this 3x3 Matrix plus translation vector representation, or if this is just an external representation and 4x4 matrices are used internally? Christoph --------------D59C183B6114600E065B9AF6 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit

Hello James!

Out of curiosity, 4x4 matrices with homogeneus coordinates are quite common in computer graphics (see OpenGL),

as they are the only way to formulate homogeneus transformationns as projection for instance. The Yarozee DevKit does

not provide any functionality to influence the projection except for the GsSetProjectionDistance or something like this.

Does the Playatstion also internally use this 3x3 Matrix plus translation vector representation, or if this is just an

external representation and 4x4 matrices are used internally?

Christoph

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