For easier subsequent finding, I bring together here the three utilities 
for making chains and catenaries discussed elsewhere (see initial 
message in povray.newusers: 
https://news.povray.org/povray.newusers/thread/%3Cweb.5daed46f8fb75c41ad6bf02d0%40news.povray.org%3E/

)

1) Lance Purple: Pylon.zip
2) PM 2Ring: Catenary.zip
3) Rob Antonishen: Chain.zip

Additionally, it is always worthwhile to visit the Lohmüller site: 
http://www.f-lohmueller.de/index.htm

-- 
Thomas

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Attachments:
Download 'chain.zip' (203 KB) Download 'catenary.zip' (6 KB) Download 'pylon.zip' (10 KB)