With the recent talk about the object collection I thought I might 
contribute an object I've been meaning to add.  It's simple, it lacks 
bolts, it's got a lot of messy looking calculations, and most of the 
dimensions are hard coded, but I think it gets at the gist of what it's 
supposed to be.

I posted it in p.t.scenes: 
http://news.povray.org/povray.text.scene-files/message/%3C47ec91d7%40news.povray.org%3E/#%3C47ec91d7%40news.povray.org%3E

Anyway, before I submit it, I was hoping to get some feedback, in 
general and specifically on this:  I like using a system where something 
like Main_Scene_File is a global variable and if it's already defined, a 
given include file knows not to use a self-contained demo scene.   It 
means an include file can stand alone as exactly one file.

Un-comment the line near the beginning which starts with 
"//#ifndef(Main_Scene_File)..." and render the file itself.

I know I've asked this before, and I've even wished for a 
main_scene_file keyword, but I don't remember how it turned out for the 
object collection.  What gobals can be truly global?

Thanks,
Charles

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