Setting up attributes for main foot control

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First, we need some extra attributes

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on the foot IK control, create a new controls divider

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and then add two new float attributes, foot roll,

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un foot bank.

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So this is all we need for now to get the foot moving.

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Traditionally,

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you would use set driven keys to set up a reverse foot system like this.

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They are simply animation curves which allow

00:39

you to manipulate one attribute with another.

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The problem is I find them to be quite limiting.

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Plus they are very economical.

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So instead we are going to set ours up using nodes.

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Now these can come across as being more complicated

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but they are so much more flexible.

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Open the node editor

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and bring in the foot I care control.

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Let's look at the foot roll first,

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bring the reverse ball into the node editor

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and open it up

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at the start of your foot beginning to peel off the ground,

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your heel rises. So you are standing on the ball of your foot,

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something like this.

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So we need to do this first.

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It looks like we need the rotate X attribute.

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So let's connect the foot roll attribute directly to it.

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So we now have the first stage of the foot roll.

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Now things start to get a little bit more complicated

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as the foot moves onto its toes.

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Like this,

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the ball then needs to flatten back out again

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like this.

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So we need a way to reverse the direction it rotates.

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Once it gets past a certain point,

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we want the rotation to rise to a point

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but then go back down even though the foot roll attribute is still climbing.

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Let's look at the point where we want the foot to start moving onto its toes.

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So around 25

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remember that number 25

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create a new condition. Node,

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call this foot left roll condition.

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First, we need to check when the foot roll attribute goes above 25.

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So change operation to greater than

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and set second term to 25.

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The value we want the foot to rise onto the tours

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and the football joint to stop bending forwards and start bending backwards

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to recap. If the first term goes above the second term value of 25

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the condition node outputs the color if true value here.

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If it stays below, it

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uses the color of false value instead.

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So it's a good way to quickly compare things.

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Let's connect to the foot roll attribute. Now

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connect this to the first term attribute.

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We also need to connect it to the color if false R attribute two.

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So if first term is less than 25

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roll the ball forwards.

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Now set color if true R to 25.

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So basically what will happen is if the foot roll goes above

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which is the color of true value.

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Now connect out color R to the joint's rotate X attribute.

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Let's test that.

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So now the ball doesn't go past 25 even though the football attribute has.

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OK. So we have control over the ball now. So instead of being locked at 25

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let's make it reverse and move backwards.

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Create a plus minus average node

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and call it foot left roll, reverse P ma

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connect foot roll to input one D zero

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and also input one D one.

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This now gives us two inputs here.

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Now delete the first connection

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which will leave us with the attribute.

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Now set input one D 0 to 25

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the point where the ball starts to reverse,

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change the operation to subtract. So we are taking 25 away from the foot roll value.

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Next, we need another plus minus average node. So duplicate this one

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and let's call this subtract instead of reverse.

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So the first node will give us an opposite value to work with.

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And this one will take it away for us

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connect output one from the reverse plus minus average node to

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input one D one on the subtract plus minus average node.

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Let's go back to the attribute editor

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this time set operation to some.

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So what we are going to do is replace the 25

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in the color if true section here with the new value,

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which will reverse the direction of the ball.

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This is coming from the two plus minus average nodes. We just created

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connect output one D to the color if true R attribute.

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OK. Let's have a look,

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I'll reset this to zero.

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So we move up to 25

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once past it. Fingers crossed.

05:32

Yep, the ball reverses.

05:34

Perfect.