Unity Script Reference:

QuaternionNamespace: UnityEngine

Description

Quaternions are used to represent rotations.

They are compact, don't suffer from gimbal lock and can easily be interpolated. Unity internally uses Quaternions to represent all rotations.

Tthey are based on complex numbers and are not easy to understand intuitively. You almost never access or modify individual Quaternion components (x,y,z,w); most often you would just take existing rotations (e.g. from the Transform) and use them to construct new rotations (e.g. to smoothly interpolate between two rotations). The Quaternion functions that you use 99% of the time are: Quaternion.LookRotation, Quaternion.Angle, Quaternion.Euler, Quaternion.Slerp, Quaternion.FromToRotation, and Quaternion.identity. (The other functions are only for exotic uses.)

You can use the Quaternion.operator * to rotate one rotation by another, or to rotate a vector by a rotation.

Static Variables

identity	The identity rotation (Read Only). This quaternion corresponds to "no rotation": the object.

Variables

eulerAngles	Returns the euler angle representation of the rotation.
this[int]	Access the x, y, z, w components using [0], [1], [2], [3] respectively.
w	W component of the Quaternion. Don't modify this directly unless you know quaternions inside out.
x	X component of the Quaternion. Don't modify this directly unless you know quaternions inside out.
y	Y component of the Quaternion. Don't modify this directly unless you know quaternions inside out.
z	Z component of the Quaternion. Don't modify this directly unless you know quaternions inside out.

Constructors

Quaternion	Constructs new Quaternion with given x,y,z,w components.

Functions

Equals
GetHashCode
Set	Set x, y, z and w components of an existing Quaternion.
SetFromToRotation	Creates a rotation which rotates from fromDirection to toDirection.
SetLookRotation	Creates a rotation with the specified forward and upwards directions.
ToAngleAxis	Converts a rotation to angle-axis representation.
ToString	Returns a nicely formatted string of the Quaternion.

Static Functions

Angle	Returns the angle in degrees between two rotations a and b.
AngleAxis	Creates a rotation which rotates angle degrees around axis.
Dot	The dot product between two rotations.
Euler	Returns a rotation that rotates z degrees around the z axis, x degrees around the x axis, and y degrees around the y axis (in that order).
FromToRotation	Creates a rotation which rotates from fromDirection to toDirection.
Inverse	Returns the Inverse of rotation.
Lerp	Interpolates between from and to by t and normalizes the result afterwards.
LookRotation	Creates a rotation with the specified forward and upwards directions.
RotateTowards	Rotates a rotation from towards to.
Slerp	Spherically interpolates between from and to by t.

Operators

operator !=	Are two quaternions different from each other?
operator *	Combines rotations lhs and rhs.
operator ==	Are two quaternions equal to each other?