Quote -
You might like to take a look at "Shackles and chains colelction for Poser" by Zark, at sharecg. It contains a "cartenoid99.py" to pose the chain. Note that the obj is missing for the 57 link chain, but the 99 link chain is OK.

Huh.  Looks like sharecg is broken right now.  I'll try again later.  Sounds interesting.  :laugh:

Quote - Seriously why do that, just use a script to set the angles

I'm planning to use the script, rather than try to write ERC.  If someone wanted to work out the ERC, however, I'd happily add it.

It does occur to me that the catenary handling I have now will work if the two ends are at the same height.  I'm not sure how to adapt it to handle the ends at the different heights?  Hmm.  How does the math differ?  Is it the same curve in both types of situations, and if the end-heights differ, you just enter and/or leave the curve at different points?  I'm afraid all of this is new to me.  :lol:  I set out to make loops, and didn't expect to end up dealing with certain complexities of chains.  :lol:

Edit:  Sharecg is back.

===========================sigline======================================================

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.