Help with Rig/Painting weights

#1

This is the first time i’ve rigged anything before so not quite sure on how things are meant to go or if i’m doing it right at all.

I’ve been putting together a simple rig with the help from digital tutors but I just can’t seem to get the influence right (picture A&B) and I have no idea on how to correct it.

There is also this weird twisting that the rig does that I can’t control (Picture C)

Any ideas on how these issues can be resolved?

A.

http://i1184.photobucket.com/albums/z332/In3vitabletiming/Screenshot2012-04-02at131605.png

B.

http://i1184.photobucket.com/albums/z332/In3vitabletiming/Screenshot2012-04-02at131630.png

C.

http://i1184.photobucket.com/albums/z332/In3vitabletiming/Screenshot2012-04-02at131415.png

#2

To start off with, it looks to me like you’re getting your joint placement slightly out of position for the hips. Look up some images of the human skeleton with the skin drawn over (medical style) you’ll see that the hip joints sit quite low… lower than you have them, so that’ll give you a start.

As for the weight itself, that extending too much into the surrounding geo of the pelvic area, which is why it’s going with the joint and giving you that collapse. you can either reduce the influence there, or paint negative weight to help the geo go out more rather than in, or you can try adding extra joints to “hold” the geo in these tricky places, skin the offending areas to them, and then sue something like driven keys or constraints to give them a lil movement to complement whats happening with the main leg itself.

The twisting thing… basically one of your joints somewhere is inverting around its twist axis… I suspect either a misplaced pole vector, or not having one at all. Setting one of those up correctly will ensure that your joint is always twisted in teh correct orientation.

#3

about the twisting in the leg…a pole vector/Up node/ Up Vector ( there’s a few words for it) will always drive the direction the IK is pointing at. If the Ik goes pass the pole vector the IK will flip in order to look at the pole vector. In practice this controller is used to drive the knee/elbow position/orientation.

I Assume the red K is your Up node… so that would mean that your left IK joint went throught the Blue K ( assuming there’s one hidden by the leg) creating the flip.

How to fix it: You can either move it away from the body or link it to your foot controller.

#4

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