Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!purdue!gatech!prism!vsserv!geomag!prem
From: prem@geomag.fsu.edu (Prem Subrahmanyam)
Newsgroups: comp.graphics
Subject: Re: Turbulence functions
Message-ID: <196@vsserv.scri.fsu.edu>
Date: 14 Sep 89 13:05:03 GMT
References: <QZ3Y6tm00WB_01TGQw@andrew.cmu.edu> <14364@netnews.upenn.edu>
Reply-To: prem@geomag.gly.fsu.edu (Prem Subrahmanyam)
Organization: Florida State University Computing Center
Lines: 13


   I would suggest getting a copy of DBW_Render.  We have one lurking on
   our anon. ftp account (geomag.gly.fsu.edu 128.186.10.2).  It's under
   the directory /pub/pics/DBW.src.  In cal.c, it has all the turbulence/
   wave-mapping/noise functions (all based on wave sources defined by the
   user at run-time).  In tex.c are examples of implementing these 
   functions for doing turbulent textures.  In fil.c is an example of
   how to use the noise function to produce nice fractals.  In, I believe,
   int.c is shown how to use the wave sources to perturb the normal for
   reflection purposes.  Also included are how to randomly perturb it for
   pebbling and fuzziness.  DBW is by far the most advanced in implementing
   all of these textures of any publically available ray-tracer.
   ---Prem Subrahmanyam