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View Full Version : IK leg flipping problem


Tom N.
02-16-2004, 06:00 PM
I'm sure this is something a lot of people run into and know how to fix, I used to know how but its been a long time since I rigged anything that I've completely forgotten (sad, I know). So anyways, Heres a pic of my problem, I have a foot control and when I bend the models leg too far up, the leg completely flips over. I've included a picture and the actual scene file, any help is greatly appreciated.

-Tom N.

Link to rig I used (right click save as) Rig (http://www.angelfire.com/moon/tomny/Rig.mb)

Tutorial I built the rig from: Rigging Tutorial (http://www.steven-tubbrit.pwp.blueyonder.co.uk/Tutorials/Tutorial_04.htm)

Image of problem:
http://www.angelfire.com/moon/tomny/IK2.jpg

Nenox
02-16-2004, 06:57 PM
It's because of your polevectors! When I open your scene, they are visible and they don't move with the feet.

They seem to be parented under the COG, wich seems kinda strange to me. On top of that you have locked out translate Y and Z so you can't move or animate them to fix your problem.

The way I like to setup polevectors is to have them follow the feett. If you rotate one of your characters feet out or in (in Y) the knees don't follow. I think they should follow, more or less. Try it with your own body to see what I meen.

Mr. J.S. has a very nice way of setting up legs. I could try to explain it if you'r interested. It's on the Fast animation rigs DVD from Alias.. along with other very nice stuff, as allways from Mr. Jason. (No I'm not Japaneese :) )

Tom N.
02-16-2004, 07:51 PM
Originally posted by Nenox

Mr. J.S. has a very nice way of setting up legs. I could try to explain it if you'r interested. It's on the Fast animation rigs DVD from Alias.. along with other very nice stuff, as allways from Mr. Jason. (No I'm not Japaneese :) )

Hey Nenox, thanks a lot for the reply, I'll try parenting the pole vector control to the foot control and see if that makes a difference.

Also, I'm always interested in a different way of setting up a character, so if you could explain the different rig, then I'd definately try it out. Thanks a lot.

-Tom N.

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