3d PostScript=pex?

From: memura : at : stardent.chem.UTOLEDO.EDU (Mike Mura)
Subject: 3d PostScript=pex?
Date: Fri, 3 Apr 92 14:18:47 EST

I heard from a Comp. Sci. friend of mine that an extension to postscript
 to include 3D structures exists.  I believe that it is called
 pex ( PostScript extension).  Beyond this I know very little about it.
 Perhaps It will become a standard following the success of Postscript.
 Michael
 Date: Fri, 3 Apr 92 15:11:24 CST
 From: doherty : at : msc.EDU (David C. Doherty)
 Subject: Re: 3d PostScript=pex?
 To: memura : at : stardent.chem.UTOLEDO.EDU (Mike Mura)
 Cc: chemistry : at : ccl.net
 >I heard from a Comp. Sci. friend of mine that an extension to postscript
 >to include 3D structures exists.  I believe that it is called
 >pex ( PostScript extension).  Beyond this I know very little about it.
 >Perhaps It will become a standard following the success of Postscript.
 I believe that PEX is actually a 3D extension to X windows (Phigs Extension
 to X). Allows one to do Phigs over an X wire.
 --
 David C. Doherty
 Minnesota Supercomputer Center
 doherty : at : msc.edu