How to: knee bend/ACL?

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  02 February 2013
How to: knee bend/ACL?

I'm bidding on a job and wondering what's the simplest way to accomplish this:

http://canopusprojects.com/clips_html/clips/knee.mov

There's a little more going on there than a bend - the femur first moves and rotates, then starts to pivot more while it's moving to full bend. And those ligaments are attached to both bones. Would you build a single model, rig it, and use weighting to get those stretches? Or is there something simpler? They're looking for serious detail, so I can't fake it and have a ligament model just going into the surface of the bone model. It should look real.

I considered also just doing it simply with PLA, since really you're only building half a cycle. You can reverse it to un-bend. Is it all six of one half dozen of the other? Thanks -
 
  02 February 2013
I did the exact same animation a few years ago. If memory serves well, I had used spline IKs for the ligaments, with Stretch, and just animated the targets to shape the ligaments along the bones.
For the bone animation, I animated it all by hand, since it needed to slide in a specific manner, changing axis and position as well.
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  02 February 2013
That's awesome, thanks for the notes! I'll look into your method, sounds cool.
 
  02 February 2013
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