Leg Foot Roll IK Rig

[Professor Watkins]

Here's the foot rig we looked at in class.

[Professor Watkins]

Some further notes about this rig.

The hierarchy goes like this:

R_foot (axis on ball)
--L R_HeelPivot (axis on heel)
-----L R_ToePivot (axis on toe)
----------L R_Ankle (axis on ball)
---------------L (IK handle) R_AnkleIK
----------L R_toe (axis on ball)
---------------L (IK handle) R_toeIK
----------L (IK Handle) R_ball IK

Added attribute
Add an Attribute to R_Foot under Modify>Add Attribute
Attribute Name: roll
Date Type: Float
Minimum: -5
Maximum: 10
Default: 0

For the set-driven keys:

Driver: R_Foot ->Roll

Driven: R_HeelPivot
R_ToePivot
R_Ankle
(all of these are the rotateX)

Keys:
Roll: 0
R_heelPivot xrotate:0
R_toepivot xrotate:0
R_ankelpivot xrotate:0

Roll:-5
R_heelPivot xRotate: -25

Roll: 5
R_ankle xRotate: 40

Roll: 10
R_toePivot xRotate: 20

Hope all that makes sense.

[Sam Treadway]

bump

[Thomas Monberg Thompson]

my only question is why do you have both L and R in your names, and also what about when the ankle tips left and right?

[Professor Watkins]

it's not an L - it's a sign trying to replicate what the hierarchy looks like.

What do you mean when the ankle tips left and right? Other than the Rotate X attribute, all the rotation and scale attributes of all the IK targets and target groups are editable and keyable.

[Thomas Monberg Thompson]

its a minor thing, but if a guy is running, then plants his foot and changes directions, the foot role would slighty have a rotations from the ankle in the y rotation, because the ankle acts like a wrist at times. Im just asking if you can still do this even if the keys are set driven like this

[Professor Watkins]

Yep it would. Luckily with that setup, you can do that.

[Dashmore]

How do you keyframe for "roll"?

[Jacqueline]

With the foot selected, in the Channel Box, right-click "Roll," then select "Key Selected."

[nowhere man]

How exactly do you set the keys for the rig? Under where do you do it exactly?

[Professor Watkins]

Not sure what you're asking here. You referring to how you set the Set Driven Keys?

[nowhere man]

Yes, the set-driven keys.

This part... where/how do you set the roll and xrotate characteristics?

Keys:
Roll: 0
R_heelPivot xrotate:0
R_toepivot xrotate:0
R_ankelpivot xrotate:0

Roll:-5
R_heelPivot xRotate: -25

Roll: 5
R_ankle xRotate: 40

Roll: 10
R_toePivot xRotate: 20

[Professor Watkins]

Animate>Set Driven Keys>Set (Options)

Be sure to load the driver and driven to match the keys listed.

[nowhere man]

Ah, yes, I've already done that much.

But how do you set the characteristics after that? Do you just enter the values in the attributes window and hit the "Key" button in the Set Driven Key window...?

This is probably a simple matter, but I don't know what to do next.

See, I've already done this...

[Professor Watkins]

Change the value for Roll and then select the part of the foot called for in the setting and change it's rotatex value. Then hit Key....