For my current project, I'm trying to create procedural animation for a quadruped drone. I've followed Mihnea Stoica's process for procedural animation through CHOPs [www.youtube.com], and I can fairly easily get some crude animation that I could iterate on until it was good enough for my purposes. However, I also checked out the spider example in the content library, which uses APEX for procedural animation in a much more in-depth fashion, and....I can't make heads or tails of it. I'm not even entirely certain I've isolated which node within the APEX graph I should be trying to reverse-engineer to get started. So the first question is just that: where should I be looking to start understanding how to procedurally animate with APEX? Another question, something that's bedeviled me for quite some time, is how to expose joints/controllers to CHOPs. Once I've got my figured rigged with APEX, how do I pass transform commands to it? I've tried unpacking the skeleton and referencing controllers in a rig pose, but that throws up a lot of errors.

Partial solution to the second question: use Control Extract SOP instead of Unpack Folder.