Here is an include file with a collection of macros
that are a rewrite of the Isosurface Approximation
macros that Kevin Loney once wrote and Jaap Frank
later modified. (There's also a file that can be used
to test the macros.)

I have optimized the macros so they run faster than
the original ones. They can be used in much the same
way as those on Mike Williams' web page.

Here's some relevant posts:

   Subject: Isosurface approximation
   Sender: Kevin Loney
   Date: 2003 April 9th
   Newsgroup: povray.binaries.images

   Subject: Isosurface approximation MkII
   Sender: Kevin Loney
   Date: 2003 April 10th
   Newsgroup: povray.binaries.images

   Subject: Isosurface approximation MkIII
   Sender: Kevin Loney
   Date: 2003 July 1st
   Newsgroup: povray.binaries.images

   Re: Isosurface approximation MkIII
   Sender: Jaap Frank
   Date: 2003 July 6th
   Newsgroup: povray.binaries.scene-files

Also see:

   "Approximation Macro" (Mike Williams' web page)
   http://www.econym.demon.co.uk/isotut/approx.htm

-- 
Tor Olav
http://subcube.com

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