Game Development
Changing rotation
Learn to use Quaternion with transform.rotation.
Rotation with Transform
transform.rotation stores an object's rotation as a Quaternion. Quaternion is a data structure used to represent rotations in three-dimensional space. Instead of assigning angle values directly, you can create a Quaternion from degree-based angles using Quaternion.Euler.
transform.rotation = Quaternion.Euler(0, 90, 0);
This statement rotates the object by 90 degrees around the Y axis.
Quaternion and Euler Angles
Euler angles express the amount of rotation around the X, Y, and Z axes in degrees. Quaternion.Euler(x, y, z) converts these angles into a Quaternion value. You can assign the resulting value to the transform.rotation property.
Quaternion turn = Quaternion.Euler(30, 60, 0);
transform.rotation = turn;
Quaternion represents rotations, while Euler angles make it easier to work with readable degree values.
Exercise Rotate the Object to a Specific Angle
In the Start method, set the object's rotation to 0 degrees around X, 75 degrees around Y, and 0 degrees around Z. Assign the result of Quaternion.Euler to transform.rotation.
Show example solution
using UnityEngine;
public class RotationSetter : MonoBehaviour
{
void Start()
{
transform.rotation = Quaternion.Euler(0, 75, 0);
}
}
Test yourself
-
Which statement correctly rotates an object by 45 degrees around the Y axis?
- transform.rotation = Quaternion.Euler(0, 45, 0);
- transform.position = Quaternion.Euler(0, 45, 0);
- transform.Translate(0, 45, 0);
- transform.rotation = new Vector3(0, 45, 0);
Show answer
transform.rotation = Quaternion.Euler(0, 45, 0); — Quaternion.Euler converts three angles given in degrees into a Quaternion rotation value.
-
Create a Quaternion Rotation
transform.rotation = Quaternion.Euler(0, ____, 0);
Show answer
transform.rotation = Quaternion.Euler(0, 120, 0);
-
Rotation Concepts
- transform.rotation
- Stores object's Quaternion rotation
- Quaternion
- Represents 3D rotations
- Quaternion.Euler
- Converts angles to a Quaternion
- Euler açıları
- Specify X, Y, Z rotations in degrees
Next lesson: Local vs world space
