[Control Rig] Unreal Engine 5.2 Control Rig 教學 - Foot IK - Foot Trace - # 3 ｜腳部軌跡｜Tutorial

Liling Liu
Oct 3, 2023
1 min read

Foot IK

Add foot controllers

Set the connection between the controller and the bone

Connect the controller to the Full Body IK node

Root : Pelvis

Effectors: foot_I, foot_r, spine_04

Bone Settings

calf_I, calf_r, pelvis

calf_I, calf_r:

Use Preferred angles: turn on

Preferred Angles: Z:45

Pelvis:

Rotation Stiffness: 0.95

Position Stiffness: 0.95

Foot Trace

It will be reused function, so wrap the nodes together.

Create a Function: Foot Trace

Foot Trace

Input add: Bone (Rig Element Key)

Output add： Trace Hit (Boolean), Trace Offset Z (Float)

Match the direction and position of the bone with Sphere Trace to determine the collision situation. Currently, the Z axis is set to 100. In order to facilitate adjustment, it promotes a parameter variable to adjust. The name is FlootHitDistance, which can be adjusted according to the character.

In order to make it easier to debug, use draw line and transform here to make line and axis phase judgments.

In order to prevent the feet from sticking to the ground, add 1 to Hit Location Z. To facilitate adjustment, it is also promotes as a parameter variable, and the name is AdditionHitOffset.