Updating the IK leg control

00:03

We need the upper leg to follow as the torso moves

00:08

looks like the IK leg isn't following the root control. So let's update that

00:13

jump over to the node editor

00:15

and bring in the leg root control.

00:18

Also add the thigh driver joint and the thigh IK joint

00:23

reposition. These

00:26

all we need to do is connect the leg roots world matrix zero attribute

00:30

to each joint's offset parent matrix attribute.

00:35

You will notice that the leg is now twisted

00:38

but because we are using the offset parent matrix attribute,

00:41

remember we need to zero out the joint's transforms,

00:45

that's better.

00:47

Now the eye k, eye

00:49

and reset the transforms,

00:52

you'll notice that there are still some rotations here.

00:56

These are actually coming from the joint orient attributes,

00:60

but the leg hasn't changed position because

01:02

it's being controlled by the spring solver.

01:05

Now,

01:06

it's important that you also zero these out too and I actually forgot at this stage.

01:11

If you don't ze

01:12

them out,

01:13

you will end up with problems like this where the

01:16

leg fees to be rotating in the opposite way.

01:19

Now, on a side point, if you do find that you're having some issues with the leg

01:24

maybe try switching to a rotate plane solver. Instead

01:28

these do tend to be a bit more stable.