/Godot 3.0

# Quat

Category: Built-In Types

Quaternion.

## Member Functions

 Quat Quat ( float x, float y, float z, float w ) Quat Quat ( Vector3 axis, float angle ) Quat Quat ( Basis from ) Quat cubic_slerp ( Quat b, Quat pre_a, Quat post_b, float t ) float dot ( Quat b ) Quat inverse ( ) bool is_normalized ( ) float length ( ) float length_squared ( ) Quat normalized ( ) Quat slerp ( Quat b, float t ) Quat slerpni ( Quat b, float t ) Vector3 xform ( Vector3 v )

## Member Variables

• float w - W component of the quaternion. Default value: `1`
• float x - X component of the quaternion. Default value: `0`
• float y - Y component of the quaternion. Default value: `0`
• float z - Z component of the quaternion. Default value: `0`

## Description

A 4-dimensional vector representing a rotation.

The vector represents a 4 dimensional complex number where multiplication of the basis elements is not commutative (multiplying i with j gives a different result than multiplying j with i).

Multiplying quaternions reproduces rotation sequences. However quaternions need to be often renormalized, or else they suffer from precision issues.

It can be used to perform SLERP (spherical-linear interpolation) between two rotations.

## Member Function Description

### Quat Quat ( float x, float y, float z, float w )

Returns a quaternion defined by these values.

### Quat Quat ( Vector3 axis, float angle )

Returns a quaternion that will rotate around the given axis by the specified angle. The axis must be a normalized vector.

### Quat Quat ( Basis from )

Returns the rotation matrix corresponding to the given quaternion.

### Quat cubic_slerp ( Quat b, Quat pre_a, Quat post_b, float t )

Performs a cubic spherical-linear interpolation with another quaternion.

### float dot ( Quat b )

Returns the dot product of two quaternions.

### Quat inverse ( )

Returns the inverse of the quaternion.

### bool is_normalized ( )

Returns whether the quaternion is normalized or not.

### float length ( )

Returns the length of the quaternion.

### float length_squared ( )

Returns the length of the quaternion, squared.

### Quat normalized ( )

Returns a copy of the quaternion, normalized to unit length.

### Quat slerp ( Quat b, float t )

Performs a spherical-linear interpolation with another quaternion.

### Quat slerpni ( Quat b, float t )

Performs a spherical-linear interpolation with another quaterion without checking if the rotation path is not bigger than 90°.

### Vector3 xform ( Vector3 v )

Transforms the vector `v` by this quaternion.

© 2014–2018 Juan Linietsky, Ariel Manzur, Godot Engine contributors