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- Path: sparky!uunet!olivea!pagesat!spssig.spss.com!uchinews!fciad2.bsd.uchicago.edu!chrisw
- From: chrisw@fciad2.bsd.uchicago.edu (chris williams)
- Newsgroups: comp.sys.amiga.graphics
- Subject: Re: which machine should I buy?
- Message-ID: <1992Dec31.010453.8605@midway.uchicago.edu>
- Date: 31 Dec 92 01:04:53 GMT
- References: <18754@mindlink.bc.ca> <1992Dec24.063709.4319@newshub.ariel.yorku.ca>
- Sender: news@uchinews.uchicago.edu (News System)
- Organization: FCIA Univ. of Chicago
- Lines: 40
-
- In article <1992Dec24.063709.4319@newshub.ariel.yorku.ca> cs902125@ariel.yorku.ca (SHUK C YIP) writes:
- >In article <18754@mindlink.bc.ca> Jeff_Holinski@mindlink.bc.ca (Jeff Holinski) writes:
- >>
- >>You can definitly get good 3D software for a 486. Autodesk's 3D Studio is one
- >>of the cheaper and more popular packages. I've heard it has a very good
- >>modeler and the renderings I've seen done with it looked pretty good. You can
- >
- >I think the best modeler is Caligari. It is similar to ALIAS RESEARCH
- >SYSTEM.
-
- Not ALIAS, but SYMBOLICS. Alias is a patch-based modeler (NURBS
- optional) that converts to polygons at render time. Symbolics and
- Caligari are B-Rep based systems. B-Reps (boundery representation)
- allow a more sculptural method of modeling than polygon or patch based
- modelers. Lightwave, Sculpt 4D, Wavefront, Topas and Digital Arts are
- polygon based, and every vertex, edge and polygon must be created.
- Alias, TDI, Journeyman are patch-based and objects are constructed from
- splines, with a surface "skinned" over the spline structure.
-
- Caligari and Symboloics are the only (to my knowlege) b-rep systems
- intended for animation. They are more popular in the very-high-end CAD
- market. B-reps maintain the construction process as a tree; call up a
- cube - "bevel" all edges several times and wind up with a cube. Traverse
- back up the tree, to the original cube for preview purposes.
-
- I have seen a very good Symbolics operator create a human hand
- starting with a cube, and subdividing and smoothing and bending via a
- FFD lattice.
-
- Symbolics is nowhere as popular as some packages du to several
- factors: It only runs on LISP machines or a LISP board set in a MAC.
- It uses a monochrome interface and a seperate framebuffer screen.
-
- One interesting point: Symbolics supplied source code with the
- software. They are the only animation software maker to do so. Caligari
- is *so* similar in so many ways that one is forced to wonder if Octree
- has a copy of it...
-
- Chris Williams
- chrisw@fciad2.bsd.uchicago.edu
-