godot-docs/classes/class_basis.rst

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.. _class_Basis:

Basis
=====

A 3×3 matrix for representing 3D rotation and scale.

.. rst-class:: classref-introduction-group

Description
-----------

The **Basis** built-in :ref:`Variant<class_Variant>` type is a 3x3 `matrix <https://en.wikipedia.org/wiki/Matrix_(mathematics)>`__ used to represent 3D rotation, scale, and shear. It is frequently used within a :ref:`Transform3D<class_Transform3D>`.

A **Basis** is composed by 3 axis vectors, each representing a column of the matrix: :ref:`x<class_Basis_property_x>`, :ref:`y<class_Basis_property_y>`, and :ref:`z<class_Basis_property_z>`. The length of each axis (:ref:`Vector3.length<class_Vector3_method_length>`) influences the basis's scale, while the direction of all axes influence the rotation. Usually, these axes are perpendicular to one another. However, when you rotate any axis individually, the basis becomes sheared. Applying a sheared basis to a 3D model will make the model appear distorted.

A **Basis** is **orthogonal** if its axes are perpendicular to each other. A basis is **normalized** if the length of every axis is ``1``. A basis is **uniform** if all axes share the same length (see :ref:`get_scale<class_Basis_method_get_scale>`). A basis is **orthonormal** if it is both orthogonal and normalized, which allows it to only represent rotations. A basis is **conformal** if it is both orthogonal and uniform, which ensures it is not distorted.

For a general introduction, see the :doc:`Matrices and transforms <../tutorials/math/matrices_and_transforms>` tutorial.

\ **Note:** Godot uses a `right-handed coordinate system <https://en.wikipedia.org/wiki/Right-hand_rule>`__, which is a common standard. For directions, the convention for built-in types like :ref:`Camera3D<class_Camera3D>` is for -Z to point forward (+X is right, +Y is up, and +Z is back). Other objects may use different direction conventions. For more information, see the `Importing 3D Scenes <../tutorials/assets_pipeline/importing_scenes.html#d-asset-direction-conventions>`__ tutorial.

\ **Note:** The basis matrices are exposed as `column-major <https://www.mindcontrol.org/~hplus/graphics/matrix-layout.html>`__ order, which is the same as OpenGL. However, they are stored internally in row-major order, which is the same as DirectX.

.. rst-class:: classref-introduction-group

Tutorials
---------

- :doc:`Math documentation index <../tutorials/math/index>`

- :doc:`Matrices and transforms <../tutorials/math/matrices_and_transforms>`

- :doc:`Using 3D transforms <../tutorials/3d/using_transforms>`

- `Matrix Transform Demo <https://godotengine.org/asset-library/asset/584>`__

- `3D Platformer Demo <https://godotengine.org/asset-library/asset/125>`__

- `3D Voxel Demo <https://godotengine.org/asset-library/asset/676>`__

- `2.5D Demo <https://godotengine.org/asset-library/asset/583>`__

.. rst-class:: classref-reftable-group

Properties
----------

.. table::
   :widths: auto

   +-------------------------------+----------------------------------+----------------------+
   | :ref:`Vector3<class_Vector3>` | :ref:`x<class_Basis_property_x>` | ``Vector3(1, 0, 0)`` |
   +-------------------------------+----------------------------------+----------------------+
   | :ref:`Vector3<class_Vector3>` | :ref:`y<class_Basis_property_y>` | ``Vector3(0, 1, 0)`` |
   +-------------------------------+----------------------------------+----------------------+
   | :ref:`Vector3<class_Vector3>` | :ref:`z<class_Basis_property_z>` | ``Vector3(0, 0, 1)`` |
   +-------------------------------+----------------------------------+----------------------+

.. rst-class:: classref-reftable-group

Constructors
------------

.. table::
   :widths: auto

   +---------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>` | :ref:`Basis<class_Basis_constructor_Basis>` **(** **)**                                                                                                                  |
   +---------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>` | :ref:`Basis<class_Basis_constructor_Basis>` **(** :ref:`Basis<class_Basis>` from **)**                                                                                   |
   +---------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>` | :ref:`Basis<class_Basis_constructor_Basis>` **(** :ref:`Vector3<class_Vector3>` axis, :ref:`float<class_float>` angle **)**                                              |
   +---------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>` | :ref:`Basis<class_Basis_constructor_Basis>` **(** :ref:`Quaternion<class_Quaternion>` from **)**                                                                         |
   +---------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>` | :ref:`Basis<class_Basis_constructor_Basis>` **(** :ref:`Vector3<class_Vector3>` x_axis, :ref:`Vector3<class_Vector3>` y_axis, :ref:`Vector3<class_Vector3>` z_axis **)** |
   +---------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

.. rst-class:: classref-reftable-group

Methods
-------

.. table::
   :widths: auto

   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`float<class_float>`           | :ref:`determinant<class_Basis_method_determinant>` **(** **)** |const|                                                                                                                                       |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>`           | :ref:`from_euler<class_Basis_method_from_euler>` **(** :ref:`Vector3<class_Vector3>` euler, :ref:`int<class_int>` order=2 **)** |static|                                                                     |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>`           | :ref:`from_scale<class_Basis_method_from_scale>` **(** :ref:`Vector3<class_Vector3>` scale **)** |static|                                                                                                    |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Vector3<class_Vector3>`       | :ref:`get_euler<class_Basis_method_get_euler>` **(** :ref:`int<class_int>` order=2 **)** |const|                                                                                                             |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Quaternion<class_Quaternion>` | :ref:`get_rotation_quaternion<class_Basis_method_get_rotation_quaternion>` **(** **)** |const|                                                                                                               |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Vector3<class_Vector3>`       | :ref:`get_scale<class_Basis_method_get_scale>` **(** **)** |const|                                                                                                                                           |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>`           | :ref:`inverse<class_Basis_method_inverse>` **(** **)** |const|                                                                                                                                               |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`bool<class_bool>`             | :ref:`is_equal_approx<class_Basis_method_is_equal_approx>` **(** :ref:`Basis<class_Basis>` b **)** |const|                                                                                                   |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`bool<class_bool>`             | :ref:`is_finite<class_Basis_method_is_finite>` **(** **)** |const|                                                                                                                                           |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>`           | :ref:`looking_at<class_Basis_method_looking_at>` **(** :ref:`Vector3<class_Vector3>` target, :ref:`Vector3<class_Vector3>` up=Vector3(0, 1, 0), :ref:`bool<class_bool>` use_model_front=false **)** |static| |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>`           | :ref:`orthonormalized<class_Basis_method_orthonormalized>` **(** **)** |const|                                                                                                                               |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>`           | :ref:`rotated<class_Basis_method_rotated>` **(** :ref:`Vector3<class_Vector3>` axis, :ref:`float<class_float>` angle **)** |const|                                                                           |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>`           | :ref:`scaled<class_Basis_method_scaled>` **(** :ref:`Vector3<class_Vector3>` scale **)** |const|                                                                                                             |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>`           | :ref:`slerp<class_Basis_method_slerp>` **(** :ref:`Basis<class_Basis>` to, :ref:`float<class_float>` weight **)** |const|                                                                                    |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`float<class_float>`           | :ref:`tdotx<class_Basis_method_tdotx>` **(** :ref:`Vector3<class_Vector3>` with **)** |const|                                                                                                                |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`float<class_float>`           | :ref:`tdoty<class_Basis_method_tdoty>` **(** :ref:`Vector3<class_Vector3>` with **)** |const|                                                                                                                |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`float<class_float>`           | :ref:`tdotz<class_Basis_method_tdotz>` **(** :ref:`Vector3<class_Vector3>` with **)** |const|                                                                                                                |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>`           | :ref:`transposed<class_Basis_method_transposed>` **(** **)** |const|                                                                                                                                         |
   +-------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

.. rst-class:: classref-reftable-group

Operators
---------

.. table::
   :widths: auto

   +-------------------------------+-----------------------------------------------------------------------------------------------------+
   | :ref:`bool<class_bool>`       | :ref:`operator !=<class_Basis_operator_neq_Basis>` **(** :ref:`Basis<class_Basis>` right **)**      |
   +-------------------------------+-----------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>`     | :ref:`operator *<class_Basis_operator_mul_Basis>` **(** :ref:`Basis<class_Basis>` right **)**       |
   +-------------------------------+-----------------------------------------------------------------------------------------------------+
   | :ref:`Vector3<class_Vector3>` | :ref:`operator *<class_Basis_operator_mul_Vector3>` **(** :ref:`Vector3<class_Vector3>` right **)** |
   +-------------------------------+-----------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>`     | :ref:`operator *<class_Basis_operator_mul_float>` **(** :ref:`float<class_float>` right **)**       |
   +-------------------------------+-----------------------------------------------------------------------------------------------------+
   | :ref:`Basis<class_Basis>`     | :ref:`operator *<class_Basis_operator_mul_int>` **(** :ref:`int<class_int>` right **)**             |
   +-------------------------------+-----------------------------------------------------------------------------------------------------+
   | :ref:`bool<class_bool>`       | :ref:`operator ==<class_Basis_operator_eq_Basis>` **(** :ref:`Basis<class_Basis>` right **)**       |
   +-------------------------------+-----------------------------------------------------------------------------------------------------+
   | :ref:`Vector3<class_Vector3>` | :ref:`operator []<class_Basis_operator_idx_int>` **(** :ref:`int<class_int>` index **)**            |
   +-------------------------------+-----------------------------------------------------------------------------------------------------+

.. rst-class:: classref-section-separator

----

.. rst-class:: classref-descriptions-group

Constants
---------

.. _class_Basis_constant_IDENTITY:

.. rst-class:: classref-constant

**IDENTITY** = ``Basis(1, 0, 0, 0, 1, 0, 0, 0, 1)``

The identity basis. This is a basis with no rotation, no shear, and its scale being ``1``. This means that:

- The :ref:`x<class_Basis_property_x>` points right (:ref:`Vector3.RIGHT<class_Vector3_constant_RIGHT>`);

- The :ref:`y<class_Basis_property_y>` points up (:ref:`Vector3.UP<class_Vector3_constant_UP>`);

- The :ref:`z<class_Basis_property_z>` points back (:ref:`Vector3.BACK<class_Vector3_constant_BACK>`).

::

    var basis := Basis.IDENTITY
    print("| X | Y | Z")
    print("| %s | %s | %s" % [basis.x.x, basis.y.x, basis.z.x])
    print("| %s | %s | %s" % [basis.x.y, basis.y.y, basis.z.y])
    print("| %s | %s | %s" % [basis.x.z, basis.y.z, basis.z.z])
    # Prints:
    # | X | Y | Z
    # | 1 | 0 | 0
    # | 0 | 1 | 0
    # | 0 | 0 | 1

This is identical to creating ``Basis()`` without any parameters. This constant can be used to make your code clearer, and for consistency with C#.

.. _class_Basis_constant_FLIP_X:

.. rst-class:: classref-constant

**FLIP_X** = ``Basis(-1, 0, 0, 0, 1, 0, 0, 0, 1)``

When any basis is multiplied by :ref:`FLIP_X<class_Basis_constant_FLIP_X>`, it negates all components of the :ref:`x<class_Basis_property_x>` axis (the X column).

When :ref:`FLIP_X<class_Basis_constant_FLIP_X>` is multiplied by any basis, it negates the :ref:`Vector3.x<class_Vector3_property_x>` component of all axes (the X row).

.. _class_Basis_constant_FLIP_Y:

.. rst-class:: classref-constant

**FLIP_Y** = ``Basis(1, 0, 0, 0, -1, 0, 0, 0, 1)``

When any basis is multiplied by :ref:`FLIP_Y<class_Basis_constant_FLIP_Y>`, it negates all components of the :ref:`y<class_Basis_property_y>` axis (the Y column).

When :ref:`FLIP_Y<class_Basis_constant_FLIP_Y>` is multiplied by any basis, it negates the :ref:`Vector3.y<class_Vector3_property_y>` component of all axes (the Y row).

.. _class_Basis_constant_FLIP_Z:

.. rst-class:: classref-constant

**FLIP_Z** = ``Basis(1, 0, 0, 0, 1, 0, 0, 0, -1)``

When any basis is multiplied by :ref:`FLIP_Z<class_Basis_constant_FLIP_Z>`, it negates all components of the :ref:`z<class_Basis_property_z>` axis (the Z column).

When :ref:`FLIP_Z<class_Basis_constant_FLIP_Z>` is multiplied by any basis, it negates the :ref:`Vector3.z<class_Vector3_property_z>` component of all axes (the Z row).

.. rst-class:: classref-section-separator

----

.. rst-class:: classref-descriptions-group

Property Descriptions
---------------------

.. _class_Basis_property_x:

.. rst-class:: classref-property

:ref:`Vector3<class_Vector3>` **x** = ``Vector3(1, 0, 0)``

The basis's X axis, and the column ``0`` of the matrix.

On the identity basis, this vector points right (:ref:`Vector3.RIGHT<class_Vector3_constant_RIGHT>`).

.. rst-class:: classref-item-separator

----

.. _class_Basis_property_y:

.. rst-class:: classref-property

:ref:`Vector3<class_Vector3>` **y** = ``Vector3(0, 1, 0)``

The basis's Y axis, and the column ``1`` of the matrix.

On the identity basis, this vector points up (:ref:`Vector3.UP<class_Vector3_constant_UP>`).

.. rst-class:: classref-item-separator

----

.. _class_Basis_property_z:

.. rst-class:: classref-property

:ref:`Vector3<class_Vector3>` **z** = ``Vector3(0, 0, 1)``

The basis's Z axis, and the column ``2`` of the matrix.

On the identity basis, this vector points back (:ref:`Vector3.BACK<class_Vector3_constant_BACK>`).

.. rst-class:: classref-section-separator

----

.. rst-class:: classref-descriptions-group

Constructor Descriptions
------------------------

.. _class_Basis_constructor_Basis:

.. rst-class:: classref-constructor

:ref:`Basis<class_Basis>` **Basis** **(** **)**

Constructs a **Basis** identical to the :ref:`IDENTITY<class_Basis_constant_IDENTITY>`.

.. rst-class:: classref-item-separator

----

.. rst-class:: classref-constructor

:ref:`Basis<class_Basis>` **Basis** **(** :ref:`Basis<class_Basis>` from **)**

Constructs a **Basis** as a copy of the given **Basis**.

.. rst-class:: classref-item-separator

----

.. rst-class:: classref-constructor

:ref:`Basis<class_Basis>` **Basis** **(** :ref:`Vector3<class_Vector3>` axis, :ref:`float<class_float>` angle **)**

Constructs a **Basis** that only represents rotation, rotated around the ``axis`` by the given ``angle``, in radians. The axis must be a normalized vector.

\ **Note:** This is the same as using :ref:`rotated<class_Basis_method_rotated>` on the :ref:`IDENTITY<class_Basis_constant_IDENTITY>` basis. With more than one angle consider using :ref:`from_euler<class_Basis_method_from_euler>`, instead.

.. rst-class:: classref-item-separator

----

.. rst-class:: classref-constructor

:ref:`Basis<class_Basis>` **Basis** **(** :ref:`Quaternion<class_Quaternion>` from **)**

Constructs a **Basis** that only represents rotation from the given :ref:`Quaternion<class_Quaternion>`.

\ **Note:** Quaternions *only* store rotation, not scale. Because of this, conversions from **Basis** to :ref:`Quaternion<class_Quaternion>` cannot always be reversed.

.. rst-class:: classref-item-separator

----

.. rst-class:: classref-constructor

:ref:`Basis<class_Basis>` **Basis** **(** :ref:`Vector3<class_Vector3>` x_axis, :ref:`Vector3<class_Vector3>` y_axis, :ref:`Vector3<class_Vector3>` z_axis **)**

Constructs a **Basis** from 3 axis vectors. These are the columns of the basis matrix.

.. rst-class:: classref-section-separator

----

.. rst-class:: classref-descriptions-group

Method Descriptions
-------------------

.. _class_Basis_method_determinant:

.. rst-class:: classref-method

:ref:`float<class_float>` **determinant** **(** **)** |const|

Returns the `determinant <https://en.wikipedia.org/wiki/Determinant>`__ of this basis's matrix. For advanced math, this number can be used to determine a few attributes:

- If the determinant is exactly ``0``, the basis is not invertible (see :ref:`inverse<class_Basis_method_inverse>`).

- If the determinant is a negative number, the basis represents a negative scale.

\ **Note:** If the basis's scale is the same for every axis, its determinant is always that scale by the power of 2.

.. rst-class:: classref-item-separator

----

.. _class_Basis_method_from_euler:

.. rst-class:: classref-method

:ref:`Basis<class_Basis>` **from_euler** **(** :ref:`Vector3<class_Vector3>` euler, :ref:`int<class_int>` order=2 **)** |static|

Constructs a new **Basis** that only represents rotation from the given :ref:`Vector3<class_Vector3>` of `Euler angles <https://en.wikipedia.org/wiki/Euler_angles>`__, in radians.

- The :ref:`Vector3.x<class_Vector3_property_x>` should contain the angle around the :ref:`x<class_Basis_property_x>` axis (pitch).

- The :ref:`Vector3.y<class_Vector3_property_y>` should contain the angle around the :ref:`y<class_Basis_property_y>` axis (yaw).

- The :ref:`Vector3.z<class_Vector3_property_z>` should contain the angle around the :ref:`z<class_Basis_property_z>` axis (roll).


.. tabs::

 .. code-tab:: gdscript

    # Creates a Basis whose z axis points down.
    var my_basis = Basis.from_euler(Vector3(TAU / 4, 0, 0))
    
    print(my_basis.z) # Prints (0, -1, 0).

 .. code-tab:: csharp

    // Creates a Basis whose z axis points down.
    var myBasis = Basis.FromEuler(new Vector3(Mathf.Tau / 4.0f, 0.0f, 0.0f));
    
    GD.Print(myBasis.Z); // Prints (0, -1, 0).



The order of each consecutive rotation can be changed with ``order`` (see :ref:`EulerOrder<enum_@GlobalScope_EulerOrder>` constants). By default, the YXZ convention is used (:ref:`@GlobalScope.EULER_ORDER_YXZ<class_@GlobalScope_constant_EULER_ORDER_YXZ>`): the basis rotates first around the Y axis (yaw), then X (pitch), and lastly Z (roll). When using the opposite method :ref:`get_euler<class_Basis_method_get_euler>`, this order is reversed.

.. rst-class:: classref-item-separator

----

.. _class_Basis_method_from_scale:

.. rst-class:: classref-method

:ref:`Basis<class_Basis>` **from_scale** **(** :ref:`Vector3<class_Vector3>` scale **)** |static|

Constructs a new **Basis** that only represents scale, with no rotation or shear, from the given ``scale`` vector.


.. tabs::

 .. code-tab:: gdscript

    var my_basis = Basis.from_scale(Vector3(2, 4, 8))
    
    print(my_basis.x) # Prints (2, 0, 0).
    print(my_basis.y) # Prints (0, 4, 0).
    print(my_basis.z) # Prints (0, 0, 8).

 .. code-tab:: csharp

    var myBasis = Basis.FromScale(new Vector3(2.0f, 4.0f, 8.0f));
    
    GD.Print(myBasis.X); // Prints (2, 0, 0).
    GD.Print(myBasis.Y); // Prints (0, 4, 0).
    GD.Print(myBasis.Z); // Prints (0, 0, 8).



\ **Note:** In linear algebra, the matrix of this basis is also known as a `diagonal matrix <https://en.wikipedia.org/wiki/Diagonal_matrix>`__.

.. rst-class:: classref-item-separator

----

.. _class_Basis_method_get_euler:

.. rst-class:: classref-method

:ref:`Vector3<class_Vector3>` **get_euler** **(** :ref:`int<class_int>` order=2 **)** |const|

Returns this basis's rotation as a :ref:`Vector3<class_Vector3>` of `Euler angles <https://en.wikipedia.org/wiki/Euler_angles>`__, in radians.

- The :ref:`Vector3.x<class_Vector3_property_x>` contains the angle around the :ref:`x<class_Basis_property_x>` axis (pitch);

- The :ref:`Vector3.y<class_Vector3_property_y>` contains the angle around the :ref:`y<class_Basis_property_y>` axis (yaw);

- The :ref:`Vector3.z<class_Vector3_property_z>` contains the angle around the :ref:`z<class_Basis_property_z>` axis (roll).

The order of each consecutive rotation can be changed with ``order`` (see :ref:`EulerOrder<enum_@GlobalScope_EulerOrder>` constants). By default, the YXZ convention is used (:ref:`@GlobalScope.EULER_ORDER_YXZ<class_@GlobalScope_constant_EULER_ORDER_YXZ>`): Z (roll) is calculated first, then X (pitch), and lastly Y (yaw). When using the opposite method :ref:`from_euler<class_Basis_method_from_euler>`, this order is reversed.

\ **Note:** Euler angles are much more intuitive but are not suitable for 3D math. Because of this, consider using the :ref:`get_rotation_quaternion<class_Basis_method_get_rotation_quaternion>` method instead, which returns a :ref:`Quaternion<class_Quaternion>`.

\ **Note:** In the Inspector dock, a basis's rotation is often displayed in Euler angles (in degrees), as is the case with the :ref:`Node3D.rotation<class_Node3D_property_rotation>` property.

.. rst-class:: classref-item-separator

----

.. _class_Basis_method_get_rotation_quaternion:

.. rst-class:: classref-method

:ref:`Quaternion<class_Quaternion>` **get_rotation_quaternion** **(** **)** |const|

Returns this basis's rotation as a :ref:`Quaternion<class_Quaternion>`.

\ **Note:** Quatenions are much more suitable for 3D math but are less intuitive. For user interfaces, consider using the :ref:`get_euler<class_Basis_method_get_euler>` method, which returns Euler angles.

.. rst-class:: classref-item-separator

----

.. _class_Basis_method_get_scale:

.. rst-class:: classref-method

:ref:`Vector3<class_Vector3>` **get_scale** **(** **)** |const|

Returns the length of each axis of this basis, as a :ref:`Vector3<class_Vector3>`. If the basis is not sheared, this is the scaling factor. It is not affected by rotation.


.. tabs::

 .. code-tab:: gdscript

    var my_basis = Basis(
        Vector3(2, 0, 0),
        Vector3(0, 4, 0),
        Vector3(0, 0, 8)
    )
    # Rotating the Basis in any way preserves its scale.
    my_basis = my_basis.rotated(Vector3.UP, TAU / 2)
    my_basis = my_basis.rotated(Vector3.RIGHT, TAU / 4)
    
    print(my_basis.get_scale()) # Prints (2, 4, 8).

 .. code-tab:: csharp

    var myBasis = new Basis(
        Vector3(2.0f, 0.0f, 0.0f),
        Vector3(0.0f, 4.0f, 0.0f),
        Vector3(0.0f, 0.0f, 8.0f)
    );
    // Rotating the Basis in any way preserves its scale.
    myBasis = myBasis.Rotated(Vector3.Up, Mathf.Tau / 2.0f);
    myBasis = myBasis.Rotated(Vector3.Right, Mathf.Tau / 4.0f);
    
    GD.Print(myBasis.Scale); // Prints (2, 4, 8).



\ **Note:** If the value returned by :ref:`determinant<class_Basis_method_determinant>` is negative, the scale is also negative.

.. rst-class:: classref-item-separator

----

.. _class_Basis_method_inverse:

.. rst-class:: classref-method

:ref:`Basis<class_Basis>` **inverse** **(** **)** |const|

Returns the `inverse of this basis's matrix <https://en.wikipedia.org/wiki/Invertible_matrix>`__.

.. rst-class:: classref-item-separator

----

.. _class_Basis_method_is_equal_approx:

.. rst-class:: classref-method

:ref:`bool<class_bool>` **is_equal_approx** **(** :ref:`Basis<class_Basis>` b **)** |const|

Returns ``true`` if this basis and ``b`` are approximately equal, by calling :ref:`@GlobalScope.is_equal_approx<class_@GlobalScope_method_is_equal_approx>` on all vector components.

.. rst-class:: classref-item-separator

----

.. _class_Basis_method_is_finite:

.. rst-class:: classref-method

:ref:`bool<class_bool>` **is_finite** **(** **)** |const|

Returns ``true`` if this basis is finite, by calling :ref:`@GlobalScope.is_finite<class_@GlobalScope_method_is_finite>` on all vector components.

.. rst-class:: classref-item-separator

----

.. _class_Basis_method_looking_at:

.. rst-class:: classref-method

:ref:`Basis<class_Basis>` **looking_at** **(** :ref:`Vector3<class_Vector3>` target, :ref:`Vector3<class_Vector3>` up=Vector3(0, 1, 0), :ref:`bool<class_bool>` use_model_front=false **)** |static|

Creates a new **Basis** with a rotation such that the forward axis (-Z) points towards the ``target`` position.

By default, the -Z axis (camera forward) is treated as forward (implies +X is right). If ``use_model_front`` is ``true``, the +Z axis (asset front) is treated as forward (implies +X is left) and points toward the ``target`` position.

The up axis (+Y) points as close to the ``up`` vector as possible while staying perpendicular to the forward axis. The returned basis is orthonormalized (see :ref:`orthonormalized<class_Basis_method_orthonormalized>`). The ``target`` and ``up`` vectors cannot be :ref:`Vector3.ZERO<class_Vector3_constant_ZERO>`, and cannot be parallel to each other.

.. rst-class:: classref-item-separator

----

.. _class_Basis_method_orthonormalized:

.. rst-class:: classref-method

:ref:`Basis<class_Basis>` **orthonormalized** **(** **)** |const|

Returns the orthonormalized version of this basis. An orthonormal basis is both *orthogonal* (the axes are perpendicular to each other) and *normalized* (the axes have a length of ``1``), which also means it can only represent rotation.

It is often useful to call this method to avoid rounding errors on a rotating basis:


.. tabs::

 .. code-tab:: gdscript

    # Rotate this Node3D every frame.
    func _process(delta):
        basis = basis.rotated(Vector3.UP, TAU * delta)
        basis = basis.rotated(Vector3.RIGHT, TAU * delta)
    
        basis = basis.orthonormalized()

 .. code-tab:: csharp

    // Rotate this Node3D every frame.
    public override void _Process(double delta)
    {
        Basis = Basis.Rotated(Vector3.Up, Mathf.Tau * (float)delta)
                     .Rotated(Vector3.Right, Mathf.Tau * (float)delta)
                     .Orthonormalized();
    }



.. rst-class:: classref-item-separator

----

.. _class_Basis_method_rotated:

.. rst-class:: classref-method

:ref:`Basis<class_Basis>` **rotated** **(** :ref:`Vector3<class_Vector3>` axis, :ref:`float<class_float>` angle **)** |const|

Returns this basis rotated around the given ``axis`` by ``angle`` (in radians). The ``axis`` must be a normalized vector (see :ref:`Vector3.normalized<class_Vector3_method_normalized>`).

Positive values rotate this basis clockwise around the axis, while negative values rotate it counterclockwise.


.. tabs::

 .. code-tab:: gdscript

    var my_basis = Basis.IDENTITY
    var angle = TAU / 2
    
    my_basis = my_basis.rotated(Vector3.UP, angle)    # Rotate around the up axis (yaw).
    my_basis = my_basis.rotated(Vector3.RIGHT, angle) # Rotate around the right axis (pitch).
    my_basis = my_basis.rotated(Vector3.BACK, angle)  # Rotate around the back axis (roll).

 .. code-tab:: csharp

    var myBasis = Basis.Identity;
    var angle = Mathf.Tau / 2.0f;
    
    myBasis = myBasis.Rotated(Vector3.Up, angle);    // Rotate around the up axis (yaw).
    myBasis = myBasis.Rotated(Vector3.Right, angle); // Rotate around the right axis (pitch).
    myBasis = myBasis.Rotated(Vector3.Back, angle);  // Rotate around the back axis (roll).



.. rst-class:: classref-item-separator

----

.. _class_Basis_method_scaled:

.. rst-class:: classref-method

:ref:`Basis<class_Basis>` **scaled** **(** :ref:`Vector3<class_Vector3>` scale **)** |const|

Returns this basis with each axis's components scaled by the given ``scale``'s components.

The basis matrix's rows are multiplied by ``scale``'s components. This operation is a global scale (relative to the parent).


.. tabs::

 .. code-tab:: gdscript

    var my_basis = Basis(
        Vector3(1, 1, 1),
        Vector3(2, 2, 2),
        Vector3(3, 3, 3)
    )
    my_basis = my_basis.scaled(Vector3(0, 2, -2))
    
    print(my_basis.x) # Prints (0, 2, -2).
    print(my_basis.y) # Prints (0, 4, -4).
    print(my_basis.z) # Prints (0, 6, -6).

 .. code-tab:: csharp

    var myBasis = new Basis(
        new Vector3(1.0f, 1.0f, 1.0f),
        new Vector3(2.0f, 2.0f, 2.0f),
        new Vector3(3.0f, 3.0f, 3.0f)
    );
    myBasis = myBasis.Scaled(new Vector3(0.0f, 2.0f, -2.0f));
    
    GD.Print(myBasis.X); // Prints (0, 2, -2).
    GD.Print(myBasis.Y); // Prints (0, 4, -4).
    GD.Print(myBasis.Z); // Prints (0, 6, -6).



.. rst-class:: classref-item-separator

----

.. _class_Basis_method_slerp:

.. rst-class:: classref-method

:ref:`Basis<class_Basis>` **slerp** **(** :ref:`Basis<class_Basis>` to, :ref:`float<class_float>` weight **)** |const|

Performs a spherical-linear interpolation with the ``to`` basis, given a ``weight``. Both this basis and ``to`` should represent a rotation.

\ **Example:** Smoothly rotate a :ref:`Node3D<class_Node3D>` to the target basis over time, with a :ref:`Tween<class_Tween>`.

::

    var start_basis = Basis.IDENTITY
    var target_basis = Basis.IDENTITY.rotated(Vector3.UP, TAU / 2)
    
    func _ready():
        create_tween().tween_method(interpolate, 0.0, 1.0, 5.0).set_trans(Tween.TRANS_EXPO)
    
    func interpolate(weight):
        basis = start_basis.slerp(target_basis, weight)

.. rst-class:: classref-item-separator

----

.. _class_Basis_method_tdotx:

.. rst-class:: classref-method

:ref:`float<class_float>` **tdotx** **(** :ref:`Vector3<class_Vector3>` with **)** |const|

Returns the transposed dot product between ``with`` and the :ref:`x<class_Basis_property_x>` axis (see :ref:`transposed<class_Basis_method_transposed>`).

This is equivalent to ``basis.x.dot(vector)``.

.. rst-class:: classref-item-separator

----

.. _class_Basis_method_tdoty:

.. rst-class:: classref-method

:ref:`float<class_float>` **tdoty** **(** :ref:`Vector3<class_Vector3>` with **)** |const|

Returns the transposed dot product between ``with`` and the :ref:`y<class_Basis_property_y>` axis (see :ref:`transposed<class_Basis_method_transposed>`).

This is equivalent to ``basis.y.dot(vector)``.

.. rst-class:: classref-item-separator

----

.. _class_Basis_method_tdotz:

.. rst-class:: classref-method

:ref:`float<class_float>` **tdotz** **(** :ref:`Vector3<class_Vector3>` with **)** |const|

Returns the transposed dot product between ``with`` and the :ref:`z<class_Basis_property_z>` axis (see :ref:`transposed<class_Basis_method_transposed>`).

This is equivalent to ``basis.z.dot(vector)``.

.. rst-class:: classref-item-separator

----

.. _class_Basis_method_transposed:

.. rst-class:: classref-method

:ref:`Basis<class_Basis>` **transposed** **(** **)** |const|

Returns the transposed version of this basis. This turns the basis matrix's columns into rows, and its rows into columns.


.. tabs::

 .. code-tab:: gdscript

    var my_basis = Basis(
        Vector3(1, 2, 3),
        Vector3(4, 5, 6),
        Vector3(7, 8, 9)
    )
    my_basis = my_basis.transposed()
    
    print(my_basis.x) # Prints (1, 4, 7).
    print(my_basis.y) # Prints (2, 5, 8).
    print(my_basis.z) # Prints (3, 6, 9).

 .. code-tab:: csharp

    var myBasis = new Basis(
        new Vector3(1.0f, 2.0f, 3.0f),
        new Vector3(4.0f, 5.0f, 6.0f),
        new Vector3(7.0f, 8.0f, 9.0f)
    );
    myBasis = myBasis.Transposed();
    
    GD.Print(myBasis.X); // Prints (1, 4, 7).
    GD.Print(myBasis.Y); // Prints (2, 5, 8).
    GD.Print(myBasis.Z); // Prints (3, 6, 9).



.. rst-class:: classref-section-separator

----

.. rst-class:: classref-descriptions-group

Operator Descriptions
---------------------

.. _class_Basis_operator_neq_Basis:

.. rst-class:: classref-operator

:ref:`bool<class_bool>` **operator !=** **(** :ref:`Basis<class_Basis>` right **)**

Returns ``true`` if the components of both **Basis** matrices are not equal.

\ **Note:** Due to floating-point precision errors, consider using :ref:`is_equal_approx<class_Basis_method_is_equal_approx>` instead, which is more reliable.

.. rst-class:: classref-item-separator

----

.. _class_Basis_operator_mul_Basis:

.. rst-class:: classref-operator

:ref:`Basis<class_Basis>` **operator *** **(** :ref:`Basis<class_Basis>` right **)**

Transforms (multiplies) the ``right`` basis by this basis.

This is the operation performed between parent and child :ref:`Node3D<class_Node3D>`\ s.

.. rst-class:: classref-item-separator

----

.. _class_Basis_operator_mul_Vector3:

.. rst-class:: classref-operator

:ref:`Vector3<class_Vector3>` **operator *** **(** :ref:`Vector3<class_Vector3>` right **)**

Transforms (multiplies) the ``right`` vector by this basis, returning a :ref:`Vector3<class_Vector3>`.


.. tabs::

 .. code-tab:: gdscript

    var my_basis = Basis(Vector3(1, 1, 1), Vector3(1, 1, 1), Vector3(0, 2, 5))
    print(my_basis * Vector3(1, 2, 3)) # Prints (7, 3, 16)

 .. code-tab:: csharp

    var myBasis = new Basis(new Vector3(1, 1, 1), new Vector3(1, 1, 1), new Vector3(0, 2, 5));
    GD.Print(my_basis * new Vector3(1, 2, 3)); // Prints (7, 3, 16)



.. rst-class:: classref-item-separator

----

.. _class_Basis_operator_mul_float:

.. rst-class:: classref-operator

:ref:`Basis<class_Basis>` **operator *** **(** :ref:`float<class_float>` right **)**

Multiplies all components of the **Basis** by the given :ref:`float<class_float>`. This affects the basis's scale uniformly, resizing all 3 axes by the ``right`` value.

.. rst-class:: classref-item-separator

----

.. _class_Basis_operator_mul_int:

.. rst-class:: classref-operator

:ref:`Basis<class_Basis>` **operator *** **(** :ref:`int<class_int>` right **)**

Multiplies all components of the **Basis** by the given :ref:`int<class_int>`. This affects the basis's scale uniformly, resizing all 3 axes by the ``right`` value.

.. rst-class:: classref-item-separator

----

.. _class_Basis_operator_eq_Basis:

.. rst-class:: classref-operator

:ref:`bool<class_bool>` **operator ==** **(** :ref:`Basis<class_Basis>` right **)**

Returns ``true`` if the components of both **Basis** matrices are exactly equal.

\ **Note:** Due to floating-point precision errors, consider using :ref:`is_equal_approx<class_Basis_method_is_equal_approx>` instead, which is more reliable.

.. rst-class:: classref-item-separator

----

.. _class_Basis_operator_idx_int:

.. rst-class:: classref-operator

:ref:`Vector3<class_Vector3>` **operator []** **(** :ref:`int<class_int>` index **)**

Accesses each axis (column) of this basis by their index. Index ``0`` is the same as :ref:`x<class_Basis_property_x>`, index ``1`` is the same as :ref:`y<class_Basis_property_y>`, and index ``2`` is the same as :ref:`z<class_Basis_property_z>`.

\ **Note:** In C++, this operator accesses the rows of the basis matrix, *not* the columns. For the same behavior as scripting languages, use the ``set_column`` and ``get_column`` methods.

.. |virtual| replace:: :abbr:`virtual (This method should typically be overridden by the user to have any effect.)`
.. |const| replace:: :abbr:`const (This method has no side effects. It doesn't modify any of the instance's member variables.)`
.. |vararg| replace:: :abbr:`vararg (This method accepts any number of arguments after the ones described here.)`
.. |constructor| replace:: :abbr:`constructor (This method is used to construct a type.)`
.. |static| replace:: :abbr:`static (This method doesn't need an instance to be called, so it can be called directly using the class name.)`
.. |operator| replace:: :abbr:`operator (This method describes a valid operator to use with this type as left-hand operand.)`
.. |bitfield| replace:: :abbr:`BitField (This value is an integer composed as a bitmask of the following flags.)`