Quote - Doing perfectly straight chains is really easy (there are some arcane CR2 tricks if you want to make posable ones), doing hanging ones with the ends at the same height isn't too hard, but if the ends aren't at the same height the math gets quite tricky.

It sounds like you may be talking about whether the chain is axially-aligned or not.  Is that correct?  If they aren't axially-aligned, the direction of chain growth can be handled using a direction vector.

Maybe I'm under-thinking some part of this.  :lol:  I can't see the problem being trickier than the effort to space the rings evenly along the loop path and rotating the rings appropriately turned out to be. 

At least I'd like to think so.  :lol:  Am I overlooking something?    Possibly something involving the rotation matrix?  Hmm.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.