Lecture 13 - Arm Controls and Spline IK

# Lecture 13 - Arm Controls and Spline IK - CGS 3034 Lecture...

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CGS 3034 – Lecture 13 Arm Controls IK Spline (Spine) Solver Introduction to Computer Aided Animation Instructor: Brent Rossen

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Overview – Arm Controls and Spline Solver Arm Controls Constraints RP IK Solver Pole Vector IK Controls Spine Setup IK Spline Solver Clusters for the spline curve Parent Clusters to Manipulators Associate spine and Pelvis
Constraints Point Constraint: Makes one object move according to another object Orient Constraint: Used to make one object rotate according to another object Parent Constraint: Makes one object behave as if it were parented to another Pole Vector Constraint: Points an IK's pole vector towards the specified object

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RP IK Solver We'll be using a rotate plane IK solver for the Smurf's Arm When you make an IK handle, you also create a node called an end effector The end effector defines the end of an IK solver chain If you reposition the end effector it will move the IK handle and IK chain, but will not invoke IK. This can be useful if you want to skip a joint in a chain.
Rotation Plane Start a new scene Create 3 joints, and connect an RP ik handle from the top to the bottom RP IK allows you to pick the IK handle and move it through space It also allows you to control either the pole vector or twist attribute We'll use a pole vector constraint to control the orientation of the elbow

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Arm Joints Rename the joints (shoulder, elbow, and wrist _jt) Select the ik handle, hit the 't' key for show manipulator, try playing with the pole vector Now create a locator, snap it to the shoulder_jt (hold v) and move it straight back
Pole Vector Control Select the locator, freeze transformations This allows you to zero out the transformations later shift-select the ik handle Constrain > Pole Vector Go to the perspective window and drag the locator around Zero out the locator translations to reset it

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One thing that might help for visual control is to have the locator rotate along with the elbow joint as you move it Select the elbow joint (driver), shift select the locator (driven) Constrain > Orient options (reset settings) This really helps to see what it is you're changing on the elbow joint
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## This note was uploaded on 01/22/2012 for the course CGS 3034 taught by Professor Damkjer during the Spring '08 term at University of Florida.

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Lecture 13 - Arm Controls and Spline IK - CGS 3034 Lecture...

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