In keeping with the modern way of doing things, I've
1. put the rendering plugin up on the wiki (
http://pymolwiki.org/index.php/Rendering_Plugin )
2. put a metric version of the plugin on the same page
3. put the rayy code on my userpage on the wiki ( see my .pymolrc here:
http://pymolwiki.org/in
With all of the recent discussion about extensions to the ray command, I
thought I'd mention a little plugin I wrote several years ago. You can find
it at the bottom of
http://sitemaker.umich.edu/carlsonlab/resources.html
It's not quite as full-featured as some of the proposed ray extensions, but