Path: chuka.playstation.co.uk!news From: Peter Dollochan Newsgroups: scee.yaroze.programming.3d_graphics Subject: Re: 3d shapes Date: Mon, 21 Apr 1997 19:35:13 +0100 Organization: PlayStation Net Yaroze (SCEE) Lines: 37 Message-ID: <335BB361.5700@ukonline.co.uk> References: <335A73F5.1D5F@ukonline.co.uk> <33604cb9.1736484@news.playstation.co.uk> NNTP-Posting-Host: lon6-16.ukonline.co.uk Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.02 (Win95; I) Alex Amsel wrote: > > On Sun, 20 Apr 1997 20:52:21 +0100, Peter Dollochan > did quoth at me: > > >Okay then what's the trick! > >you've done your dxf, sorted the reversed poly's etcccc > >Now the good bit convert it into an rsd then run RSDV, say the shape > >was a plane of sort's when looking at it from the left the wing closest > >to you is see through ie you can see the main body, looking from the > >right everything is OK The same quirk's appear at various points round > >the shape SO is there some sort of poly ordering system to use in the > >.PLY files so that they display properly . Like if looking from left. > >draw right wing, then body, then left wing, > > make any sense to anybody ? > > Sounds like some polygons are set to display from the wrong view. When > playing with library objects this problem happened endlessly, although > I didn't check to see if the normals looked right in the original 3ds > file. I suspect the normals are screwed up - also check only > appropriate polygons have a double sided surface. > > To flip the polygon reverse the vertex definition order of the > polygons affected. > > Note: For those playing with quads remember (since this isn't exactly > pointed out clearly) to define the vertices in a Z formation and not > clockwise/anticlockwise as you may expect. The Z orientation will > affect which side the polygon can be viewed I'd expect. > > * Alex Amsel * Into Beyond Web Design & JAVA Programming * > * http://www.intobeyond.com * WWFC Utter Rubbish 1996-7* > MM - "Steve Corica is every bit as good as that Kinkladze" Looks like some of the poly's were double sided (some = quite a lot) cheers Pete