Root motion in Unity - Mini Project: Build & Apply

Root Motion Control in Unity

📖 Scenario: You are creating a simple character animation in Unity. You want to control the character's movement using root motion from the animation clip.

🎯 Goal: Build a Unity script that enables and disables root motion on a character's Animator component, and observe how it affects the character's movement.

📋 What You'll Learn

Create a GameObject with an Animator component

Write a script to toggle root motion on the Animator

Use a boolean variable to control root motion

Print the current root motion status to the console

💡 Why This Matters

🌍 Real World

Root motion is used in games to make character movement more natural by letting animations control position changes.

💼 Career

Understanding root motion is important for game developers and animators working with Unity to create smooth character animations.

1

Create an Animator variable

Create a public variable called animator of type Animator inside a new C# script called RootMotionController.

Unity

using UnityEngine;

public class RootMotionController : MonoBehaviour
{
    // Your code here
}

Need a hint?

Declare a public Animator variable to link the Animator component from the Unity Editor.

2

Add a boolean to control root motion

Add a public boolean variable called useRootMotion to the RootMotionController script.

Unity

using UnityEngine;

public class RootMotionController : MonoBehaviour
{
    public Animator animator;
    // Your code here
}

Need a hint?

This boolean will let you turn root motion on or off from the Unity Editor.

3

Set Animator root motion in Update

Inside the Update() method, set animator.applyRootMotion to the value of useRootMotion.

Unity

using UnityEngine;

public class RootMotionController : MonoBehaviour
{
    public Animator animator;
    public bool useRootMotion;

    void Update()
    {
        // Your code here
    }
}

Need a hint?

Use the Update method to continuously apply the root motion setting each frame.

4

Print root motion status

Add a Debug.Log statement inside Update() to print "Root motion is enabled" when useRootMotion is true, and "Root motion is disabled" when false.

Unity

using UnityEngine;

public class RootMotionController : MonoBehaviour
{
    public Animator animator;
    public bool useRootMotion;

    void Update()
    {
        animator.applyRootMotion = useRootMotion;
        // Your code here
    }
}

Need a hint?

Use an if-else statement to print the status based on the boolean value.