Path: chuka.playstation.co.uk!news From: sceetech Newsgroups: scee.yaroze.programming.3d_graphics Subject: Re: 3D engines Date: Thu, 10 Apr 1997 14:41:46 +0100 Organization: SCEE Lines: 35 Message-ID: <334CEE1A.155B@interactive.sony.com> References: <3347dd19.3248416@news.playstation.co.uk> <3348D38C.1DC1@interactive.sony.com> <334A3648.1873@micronetics.com> <3349266B.7BD4@interactive.sony.com> <3349a345.33045335@news.playstation.co.uk> <334A3058.218B@interactive.sony.com> <334b3a68.199522@news.playstation.co.uk> <334B7A3E.D59@micronetics.com> <334e8f46.1862969@news.playstation.co.uk> <334BA0FE.43B8@micronetics.com> <334BA349.28A9@interactive.sony.com> <01bc4554$78239ae0$b756dec2@algorithm> <334CAFCD.6081@interactive.sony.com> <334ccf56.1383137@news.playstation.co.uk> Reply-To: ps_yaroze@interactive.sony.com NNTP-Posting-Host: 194.203.13.10 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.01 (Win95; I) Alex Amsel wrote: > > On Thu, 10 Apr 1997 10:15:57 +0100, sceetech > did quoth at me: > > >In 2d it is a representation of a line not a line (and anti aliasing > >does recognise the line as having width). In 3d there is the problem of > >perspective, how do you think its going to be possible to make the line > >thicker if its closer and narrower further away without width? And not > >doing this will make it look terrible. > > Perhaps it doesn't matter! Being mathematically correct or 100% > realistic is not the aim of games except simulators. It doesn't have > to be the aim of a 3d engine in all ways either. Actually having lines > (always a 1 pixel width) is rather handy for some things. > > It won't look terrible at all - where did you get that idea? Many many > many 3d engines of the past 10 years have a special line draw > primitive. In many cases you don't care about the thcikness changing, > and the overhead of rotation and perspective calcs etc. is just > needless. > > * Alex Amsel * Into Beyond Web Design & JAVA Programming * > * http://www.intobeyond.com * WWFC Play off ****ers'97 * > MM: "Hand the opposition the lead, the supporters love it" It does look terrible. As you say games over the past 10 years have used this. Well the playstation wants to get away from the old style wireframes and into polygons. Anyway, I've been checking it out and there is a straight line structure in the TMD format, (and also in tmd.h, which as I wrote I should have remembered, sorry), which should do 3d lines, although ive not used it. Stuart