Quote - Which end is the start is just a matter of rotating the chain once its in the scene. I would not complicate matters by trying ro build from either end.

PLEASE PLEASE but some basic erc for bend into the chain. A master fial that will bend all segments equally.  

To build a draped chain between two given endpoints consider simplifying by rotating the endpoints parrallel to the axis and then translating it , then build the chain along the axis, and then reverse the translate and rotate back into place .  That makes calculating the chain much easier. Its what nruddock was saying about terms of reference.

You mean, don't bother with an option to build a chain from -z forwards as well as +z backwards?  I think I'm interested in the idea mainly because I'm curious about how different hierarchies for a chain might make some difference in how usable it is as a figure.  :unsure:  Hmm.

Once I get to the .cr2 portion, I'll dig up the EasyPose figures I've made by hand in the past and see what I can do about adding some EasyPose ERC to the chains.  Or do you mean I should add the catenary draping as ERC?  I think that would be beyond my skills at this point.  :lol:  If someone wants to work out a donor .cr2 that has catenary ERC in place, I'll happily use the donor to add the feature to chains made by the script.

It's excellent advice, about the frame of reference.  :laugh:  I've ended up relying on exactly that sort of thing in the new intersection validation process for the loop-making script.  I suspect I still have a lot to learn in that area, as I'm still fairly new to using matrices.

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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.