Xref: utzoo comp.sys.amiga.graphics:1454 comp.graphics:18115 Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!sdd.hp.com!samsung!nstar!tbissett From: tbissett@nstar.rn.com (Travis Bissett) Newsgroups: comp.sys.amiga.graphics,comp.graphics Subject: Re: Newell's teapot in DKBtrace? Message-ID: Date: 20 May 91 13:07:36 GMT References: Sender: bbs@nstar.rn.com (BBS Account) Organization: NSTAR, Indiana's BBS 219-289-0287/317-251-7391 Lines: 35 jrm@delta.ma.adfa.oz.au (John R Marley) writes: > > I have DKBtrace version 2.11 running on our Apollo DN10000 and wish to trace > few teapots. I have the data describing the thing, but it uses Bezier patche > I can convert the Bezier patches to heaps of smooth shaded triangles, but > calculating the vertex normals will be a bit of a #$%^&*. > > I guess what I'm asking is can it be done in this version without triangles? > What sort of shapes can on get out of the QUARTIC primitive? The body and li > of the teapot are surfaces of rotation, and the handle and spout are two > mirror-image patches, if that's any help. > > OK, so I work in a Maths Department - I'm a programmer not a Lecturer... > There are 2 Q&D approaches that might work for you -- create the triangles in Sculpt3-D, using the surface of rotation feature to make the triangles. Or, you might search out someone with the Video Toaster. I recall Allen Hastings demoed Lightwave with some fabulous "environmental mapping" on a tumbling Utah Teapot -- I bet that's the same teapot (used as a logo by NCGA I think). Or do you Down Under call it a "billy"? Hope these two suggestions are useful. Travis -- tbissett@nstar.rn.com -- Travis Bissett NSTAR conferencing site 219-289-0287/317-251-7391 internet: tbissett@nstar.rn.com 1300 newsgroups - 8 inbound lines uucp: ..!uunet!nstar.rn.com!tbissett 99 file areas - 4300 megabytes --- backbone news & mail feeds available - contact larry@nstar.rn.com ---