Re: NAPC and Coiling Programs

["\\yvind Hammer" <oyvind.hammer@xxxxxxxxxxxx>]

N. MacLeod wrote:
> 
> I haven't seen a program that implements of the Okamoto's
> methods. For 3D modelling you might check out Olvig Hammer's excellent 
> work (http://www.notam.uio.no/~oyvindha/loga.html) - which evidently 
> includes results produced by Okamoto's equations - and then get in 
> touch with him.
>

I have responded to Goldsmith, and mailed him a small C program
which produces a 3D graphics file in the Inventor or VRML
format. The latest version of Netscape includes a VRML viewer.

This program uses an equivalent to Raup's parameters, however.
The Okamoto "moving frame" method does not produce very
different shapes, but is definitely an improvement: The aperture
is set normal to the growth vector instead of normal to the
coiling axis. Ornamentation will then get a more realistic
orientation.

I might very well try to make a nice application program for
interactive 3D coiling. Do anyone out there use SGI computers?


Oyvind Hammer
University of Oslo