Basis¶

3×3 matrix datatype.

Description¶

3×3 matrix used for 3D rotation and scale. Contains 3 vector fields X, Y and Z as its columns, which can be interpreted as the local basis vectors of a transformation. Can also be accessed as array of 3D vectors. These vectors are orthogonal to each other, but are not necessarily normalized (due to scaling). Almost always used as an orthogonal basis for a Transform.

For such use, it is composed of a scaling and a rotation matrix, in that order (M = R.S).

Tutorials¶

Using 3D transforms

Properties¶

Vector3	x	`Vector3( 1, 0, 0 )`
Vector3	y	`Vector3( 0, 1, 0 )`
Vector3	z	`Vector3( 0, 0, 1 )`

Methods¶

Basis	Basis ( Quat from )
Basis	Basis ( Vector3 from )
Basis	Basis ( Vector3 axis, float phi )
Basis	Basis ( Vector3 x_axis, Vector3 y_axis, Vector3 z_axis )
float	determinant ( )
Vector3	get_euler ( )
int	get_orthogonal_index ( )
Quat	get_rotation_quat ( )
Vector3	get_scale ( )
Basis	inverse ( )
bool	is_equal_approx ( Basis b, float epsilon=1e-05 )
Basis	orthonormalized ( )
Basis	rotated ( Vector3 axis, float phi )
Basis	scaled ( Vector3 scale )
Basis	slerp ( Basis b, float t )
float	tdotx ( Vector3 with )
float	tdoty ( Vector3 with )
float	tdotz ( Vector3 with )
Basis	transposed ( )
Vector3	xform ( Vector3 v )
Vector3	xform_inv ( Vector3 v )

Constants¶

IDENTITY = Basis( 1, 0, 0, 0, 1, 0, 0, 0, 1 ) — The identity basis. This is identical to calling Basis() without any parameters. This constant can be used to make your code clearer.
FLIP_X = Basis( -1, 0, 0, 0, 1, 0, 0, 0, 1 ) — The basis that will flip something along the X axis when used in a transformation.
FLIP_Y = Basis( 1, 0, 0, 0, -1, 0, 0, 0, 1 ) — The basis that will flip something along the Y axis when used in a transformation.
FLIP_Z = Basis( 1, 0, 0, 0, 1, 0, 0, 0, -1 ) — The basis that will flip something along the Z axis when used in a transformation.

Property Descriptions¶

Vector3 x

Default Vector3( 1, 0, 0 )

The basis matrix’s X vector.

Vector3 y

Default Vector3( 0, 1, 0 )

The basis matrix’s Y vector.

Vector3 z

Default Vector3( 0, 0, 1 )

The basis matrix’s Z vector.

Method Descriptions¶

Basis Basis ( Quat from )

Create a rotation matrix from the given quaternion.

Basis Basis ( Vector3 from )

Create a rotation matrix (in the YXZ convention: first Z, then X, and Y last) from the specified Euler angles, given in the vector format as (X angle, Y angle, Z angle).

Basis Basis ( Vector3 axis, float phi )

Create a rotation matrix which rotates around the given axis by the specified angle, in radians. The axis must be a normalized vector.

Basis Basis ( Vector3 x_axis, Vector3 y_axis, Vector3 z_axis )

Create a matrix from 3 axis vectors.

float determinant ( )

Returns the determinant of the matrix.

Vector3 get_euler ( )

Returns the basis’s rotation in the form of Euler angles (in the YXZ convention: first Z, then X, and Y last). The returned vector contains the rotation angles in the format (X angle, Y angle, Z angle). See get_rotation_quat if you need a quaternion instead.

int get_orthogonal_index ( )

This function considers a discretization of rotations into 24 points on unit sphere, lying along the vectors (x,y,z) with each component being either -1, 0, or 1, and returns the index of the point best representing the orientation of the object. It is mainly used by the grid map editor. For further details, refer to the Godot source code.

Quat get_rotation_quat ( )

Returns the basis’s rotation in the form of a quaternion. See get_euler if you need Euler angles, but keep in mind quaternions should generally be preferred to Euler angles.

Vector3 get_scale ( )

Assuming that the matrix is the combination of a rotation and scaling, return the absolute value of scaling factors along each axis.

Basis inverse ( )

Returns the inverse of the matrix.

bool is_equal_approx ( Basis b, float epsilon=1e-05 )

Returns true if this basis and b are approximately equal, by calling is_equal_approx on each component.

Basis orthonormalized ( )

Returns the orthonormalized version of the matrix (useful to call from time to time to avoid rounding error for orthogonal matrices). This performs a Gram-Schmidt orthonormalization on the basis of the matrix.

Basis rotated ( Vector3 axis, float phi )

Introduce an additional rotation around the given axis by phi (radians). The axis must be a normalized vector.

Basis scaled ( Vector3 scale )

Introduce an additional scaling specified by the given 3D scaling factor.

Basis slerp ( Basis b, float t )

Assuming that the matrix is a proper rotation matrix, slerp performs a spherical-linear interpolation with another rotation matrix.

float tdotx ( Vector3 with )

Transposed dot product with the X axis of the matrix.

float tdoty ( Vector3 with )

Transposed dot product with the Y axis of the matrix.

float tdotz ( Vector3 with )

Transposed dot product with the Z axis of the matrix.

Basis transposed ( )

Returns the transposed version of the matrix.

Vector3 xform ( Vector3 v )

Returns a vector transformed (multiplied) by the matrix.

Vector3 xform_inv ( Vector3 v )

Returns a vector transformed (multiplied) by the transposed matrix.

Note: This results in a multiplication by the inverse of the matrix only if it represents a rotation-reflection.