path: root/doc/classes/Basis.xml

<?xml version="1.0" encoding="UTF-8" ?>
<class name="Basis" version="4.0">
	<brief_description>
		3×3 matrix datatype.
	</brief_description>
	<description>
		3×3 matrix used for 3D rotation and scale. Almost always used as an orthogonal basis for a [Transform3D].
		Contains 3 vector fields X, Y and Z as its columns, which are typically interpreted as the local basis vectors of a transformation. For such use, it is composed of a scaling and a rotation matrix, in that order (M = R.S).
		Can also be accessed as array of 3D vectors. These vectors are normally orthogonal to each other, but are not necessarily normalized (due to scaling).
		For more information, read the "Matrices and transforms" documentation article.
	</description>
	<tutorials>
		<link title="Math documentation index">$DOCS_URL/tutorials/math/index.html</link>
		<link title="Matrices and transforms">$DOCS_URL/tutorials/math/matrices_and_transforms.html</link>
		<link title="Using 3D transforms">$DOCS_URL/tutorials/3d/using_transforms.html</link>
		<link title="Matrix Transform Demo">https://godotengine.org/asset-library/asset/584</link>
		<link title="3D Platformer Demo">https://godotengine.org/asset-library/asset/125</link>
		<link title="3D Voxel Demo">https://godotengine.org/asset-library/asset/676</link>
		<link title="2.5D Demo">https://godotengine.org/asset-library/asset/583</link>
	</tutorials>
	<constructors>
		<constructor name="Basis">
			<return type="Basis" />
			<description>
				Constructs a default-initialized [Basis] set to [constant IDENTITY].
			</description>
		</constructor>
		<constructor name="Basis">
			<return type="Basis" />
			<argument index="0" name="from" type="Basis" />
			<description>
				Constructs a [Basis] as a copy of the given [Basis].
			</description>
		</constructor>
		<constructor name="Basis">
			<return type="Basis" />
			<argument index="0" name="axis" type="Vector3" />
			<argument index="1" name="phi" type="float" />
			<description>
				Constructs a pure rotation basis matrix, rotated around the given [code]axis[/code] by [code]phi[/code], in radians. The axis must be a normalized vector.
			</description>
		</constructor>
		<constructor name="Basis">
			<return type="Basis" />
			<argument index="0" name="from" type="Quaternion" />
			<description>
				Constructs a pure rotation basis matrix from the given quaternion.
			</description>
		</constructor>
		<constructor name="Basis">
			<return type="Basis" />
			<argument index="0" name="x_axis" type="Vector3" />
			<argument index="1" name="y_axis" type="Vector3" />
			<argument index="2" name="z_axis" type="Vector3" />
			<description>
				Constructs a basis matrix from 3 axis vectors (matrix columns).
			</description>
		</constructor>
	</constructors>
	<methods>
		<method name="determinant" qualifiers="const">
			<return type="float" />
			<description>
				Returns the determinant of the basis matrix. If the basis is uniformly scaled, its determinant is the square of the scale.
				A negative determinant means the basis has a negative scale. A zero determinant means the basis isn't invertible, and is usually considered invalid.
			</description>
		</method>
		<method name="from_euler" qualifiers="static">
			<return type="Basis" />
			<argument index="0" name="euler" type="Vector3" />
			<argument index="1" name="order" type="int" default="2" />
			<description>
			</description>
		</method>
		<method name="from_scale" qualifiers="static">
			<return type="Basis" />
			<argument index="0" name="scale" type="Vector3" />
			<description>
				Constructs a pure scale basis matrix with no rotation or shearing. The scale values are set as the diagonal of the matrix, and the other parts of the matrix are zero.
			</description>
		</method>
		<method name="get_euler" qualifiers="const">
			<return type="Vector3" />
			<argument index="0" name="order" type="int" default="2" />
			<description>
				Returns the basis's rotation in the form of Euler angles (in the YXZ convention: when decomposing, first Z, then X, and Y last). The returned vector contains the rotation angles in the format (X angle, Y angle, Z angle).
				Consider using the [method get_rotation_quaternion] method instead, which returns a [Quaternion] quaternion instead of Euler angles.
			</description>
		</method>
		<method name="get_orthogonal_index" qualifiers="const">
			<return type="int" />
			<description>
				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 [GridMap] editor. For further details, refer to the Godot source code.
			</description>
		</method>
		<method name="get_rotation_quaternion" qualifiers="const">
			<return type="Quaternion" />
			<description>
				Returns the basis's rotation in the form of a quaternion. See [method get_euler] if you need Euler angles, but keep in mind quaternions should generally be preferred to Euler angles.
			</description>
		</method>
		<method name="get_scale" qualifiers="const">
			<return type="Vector3" />
			<description>
				Assuming that the matrix is the combination of a rotation and scaling, return the absolute value of scaling factors along each axis.
			</description>
		</method>
		<method name="inverse" qualifiers="const">
			<return type="Basis" />
			<description>
				Returns the inverse of the matrix.
			</description>
		</method>
		<method name="is_equal_approx" qualifiers="const">
			<return type="bool" />
			<argument index="0" name="b" type="Basis" />
			<description>
				Returns [code]true[/code] if this basis and [code]b[/code] are approximately equal, by calling [code]is_equal_approx[/code] on each component.
			</description>
		</method>
		<method name="looking_at" qualifiers="static">
			<return type="Basis" />
			<argument index="0" name="target" type="Vector3" />
			<argument index="1" name="up" type="Vector3" default="Vector3(0, 1, 0)" />
			<description>
				Creates a Basis with a rotation such that the forward axis (-Z) points towards the [code]target[/code] position.
				The up axis (+Y) points as close to the [code]up[/code] vector as possible while staying perpendicular to the forward axis. The resulting Basis is orthonormalized. The [code]target[/code] and [code]up[/code] vectors cannot be zero, and cannot be parallel to each other.
			</description>
		</method>
		<method name="orthonormalized" qualifiers="const">
			<return type="Basis" />
			<description>
				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.
			</description>
		</method>
		<method name="rotated" qualifiers="const">
			<return type="Basis" />
			<argument index="0" name="axis" type="Vector3" />
			<argument index="1" name="phi" type="float" />
			<description>
				Introduce an additional rotation around the given axis by phi (radians). The axis must be a normalized vector.
			</description>
		</method>
		<method name="scaled" qualifiers="const">
			<return type="Basis" />
			<argument index="0" name="scale" type="Vector3" />
			<description>
				Introduce an additional scaling specified by the given 3D scaling factor.
			</description>
		</method>
		<method name="slerp" qualifiers="const">
			<return type="Basis" />
			<argument index="0" name="to" type="Basis" />
			<argument index="1" name="weight" type="float" />
			<description>
				Assuming that the matrix is a proper rotation matrix, slerp performs a spherical-linear interpolation with another rotation matrix.
			</description>
		</method>
		<method name="tdotx" qualifiers="const">
			<return type="float" />
			<argument index="0" name="with" type="Vector3" />
			<description>
				Transposed dot product with the X axis of the matrix.
			</description>
		</method>
		<method name="tdoty" qualifiers="const">
			<return type="float" />
			<argument index="0" name="with" type="Vector3" />
			<description>
				Transposed dot product with the Y axis of the matrix.
			</description>
		</method>
		<method name="tdotz" qualifiers="const">
			<return type="float" />
			<argument index="0" name="with" type="Vector3" />
			<description>
				Transposed dot product with the Z axis of the matrix.
			</description>
		</method>
		<method name="transposed" qualifiers="const">
			<return type="Basis" />
			<description>
				Returns the transposed version of the matrix.
			</description>
		</method>
	</methods>
	<members>
		<member name="x" type="Vector3" setter="" getter="" default="Vector3(1, 0, 0)">
			The basis matrix's X vector (column 0). Equivalent to array index [code]0[/code].
		</member>
		<member name="y" type="Vector3" setter="" getter="" default="Vector3(0, 1, 0)">
			The basis matrix's Y vector (column 1). Equivalent to array index [code]1[/code].
		</member>
		<member name="z" type="Vector3" setter="" getter="" default="Vector3(0, 0, 1)">
			The basis matrix's Z vector (column 2). Equivalent to array index [code]2[/code].
		</member>
	</members>
	<constants>
		<constant name="EULER_ORDER_XYZ" value="0">
		</constant>
		<constant name="EULER_ORDER_XZY" value="1">
		</constant>
		<constant name="EULER_ORDER_YXZ" value="2">
		</constant>
		<constant name="EULER_ORDER_YZX" value="3">
		</constant>
		<constant name="EULER_ORDER_ZXY" value="4">
		</constant>
		<constant name="EULER_ORDER_ZYX" value="5">
		</constant>
		<constant name="IDENTITY" value="Basis(1, 0, 0, 0, 1, 0, 0, 0, 1)">
			The identity basis, with no rotation or scaling applied.
			This is identical to calling [code]Basis()[/code] without any parameters. This constant can be used to make your code clearer, and for consistency with C#.
		</constant>
		<constant name="FLIP_X" value="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.
		</constant>
		<constant name="FLIP_Y" value="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.
		</constant>
		<constant name="FLIP_Z" value="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.
		</constant>
	</constants>
	<operators>
		<operator name="operator !=">
			<return type="bool" />
			<description>
			</description>
		</operator>
		<operator name="operator !=">
			<return type="bool" />
			<argument index="0" name="right" type="Basis" />
			<description>
				Returns [code]true[/code] if the [Basis] matrices are not equal.
				[b]Note:[/b] Due to floating-point precision errors, consider using [method is_equal_approx] instead, which is more reliable.
			</description>
		</operator>
		<operator name="operator *">
			<return type="Basis" />
			<argument index="0" name="right" type="Basis" />
			<description>
				Composes these two basis matrices by multiplying them together. This has the effect of transforming the second basis (the child) by the first basis (the parent).
			</description>
		</operator>
		<operator name="operator *">
			<return type="Vector3" />
			<argument index="0" name="right" type="Vector3" />
			<description>
				Transforms (multiplies) the [Vector3] by the given [Basis] matrix.
			</description>
		</operator>
		<operator name="operator *">
			<return type="Basis" />
			<argument index="0" name="right" type="float" />
			<description>
				This operator multiplies all components of the [Basis], which scales it uniformly.
			</description>
		</operator>
		<operator name="operator *">
			<return type="Basis" />
			<argument index="0" name="right" type="int" />
			<description>
				This operator multiplies all components of the [Basis], which scales it uniformly.
			</description>
		</operator>
		<operator name="operator ==">
			<return type="bool" />
			<description>
			</description>
		</operator>
		<operator name="operator ==">
			<return type="bool" />
			<argument index="0" name="right" type="Basis" />
			<description>
				Returns [code]true[/code] if the [Basis] matrices are exactly equal.
				[b]Note:[/b] Due to floating-point precision errors, consider using [method is_equal_approx] instead, which is more reliable.
			</description>
		</operator>
		<operator name="operator []">
			<return type="Vector3" />
			<argument index="0" name="index" type="int" />
			<description>
				Access basis components using their index. [code]b[0][/code] is equivalent to [code]b.x[/code], [code]b[1][/code] is equivalent to [code]b.y[/code], and [code]b[2][/code] is equivalent to [code]b.z[/code].
			</description>
		</operator>
	</operators>
</class>