270 lines
12 KiB
XML
270 lines
12 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="Basis" version="4.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
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<brief_description>
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3×3 matrix datatype.
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</brief_description>
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<description>
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3×3 matrix used for 3D rotation and scale. Almost always used as an orthogonal basis for a [Transform3D].
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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).
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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).
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For more information, read the "Matrices and transforms" documentation article.
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</description>
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<tutorials>
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<link title="Math documentation index">$DOCS_URL/tutorials/math/index.html</link>
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<link title="Matrices and transforms">$DOCS_URL/tutorials/math/matrices_and_transforms.html</link>
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<link title="Using 3D transforms">$DOCS_URL/tutorials/3d/using_transforms.html</link>
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<link title="Matrix Transform Demo">https://godotengine.org/asset-library/asset/584</link>
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<link title="3D Platformer Demo">https://godotengine.org/asset-library/asset/125</link>
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<link title="3D Voxel Demo">https://godotengine.org/asset-library/asset/676</link>
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<link title="2.5D Demo">https://godotengine.org/asset-library/asset/583</link>
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</tutorials>
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<constructors>
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<constructor name="Basis">
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<return type="Basis" />
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<description>
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Constructs a default-initialized [Basis] set to [constant IDENTITY].
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</description>
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</constructor>
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<constructor name="Basis">
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<return type="Basis" />
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<param index="0" name="from" type="Basis" />
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<description>
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Constructs a [Basis] as a copy of the given [Basis].
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</description>
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</constructor>
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<constructor name="Basis">
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<return type="Basis" />
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<param index="0" name="axis" type="Vector3" />
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<param index="1" name="angle" type="float" />
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<description>
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Constructs a pure rotation basis matrix, rotated around the given [param axis] by [param angle] (in radians). The axis must be a normalized vector.
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</description>
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</constructor>
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<constructor name="Basis">
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<return type="Basis" />
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<param index="0" name="from" type="Quaternion" />
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<description>
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Constructs a pure rotation basis matrix from the given quaternion.
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</description>
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</constructor>
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<constructor name="Basis">
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<return type="Basis" />
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<param index="0" name="x_axis" type="Vector3" />
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<param index="1" name="y_axis" type="Vector3" />
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<param index="2" name="z_axis" type="Vector3" />
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<description>
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Constructs a basis matrix from 3 axis vectors (matrix columns).
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</description>
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</constructor>
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</constructors>
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<methods>
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<method name="determinant" qualifiers="const">
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<return type="float" />
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<description>
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Returns the determinant of the basis matrix. If the basis is uniformly scaled, its determinant is the square of the scale.
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A negative determinant means the basis has a negative scale. A zero determinant means the basis isn't invertible, and is usually considered invalid.
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</description>
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</method>
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<method name="from_euler" qualifiers="static">
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<return type="Basis" />
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<param index="0" name="euler" type="Vector3" />
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<param index="1" name="order" type="int" default="2" />
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<description>
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Constructs a pure rotation Basis matrix from Euler angles in the specified Euler rotation order. By default, use YXZ order (most common). See the [enum EulerOrder] enum for possible values.
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</description>
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</method>
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<method name="from_scale" qualifiers="static">
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<return type="Basis" />
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<param index="0" name="scale" type="Vector3" />
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<description>
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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.
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</description>
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</method>
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<method name="get_euler" qualifiers="const">
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<return type="Vector3" />
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<param index="0" name="order" type="int" default="2" />
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<description>
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Returns the basis's rotation in the form of Euler angles. The Euler order depends on the [param order] parameter, by default it uses 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).
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Consider using the [method get_rotation_quaternion] method instead, which returns a [Quaternion] quaternion instead of Euler angles.
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</description>
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</method>
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<method name="get_rotation_quaternion" qualifiers="const">
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<return type="Quaternion" />
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<description>
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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.
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</description>
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</method>
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<method name="get_scale" qualifiers="const">
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<return type="Vector3" />
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<description>
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Assuming that the matrix is the combination of a rotation and scaling, return the absolute value of scaling factors along each axis.
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</description>
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</method>
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<method name="inverse" qualifiers="const">
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<return type="Basis" />
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<description>
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Returns the inverse of the matrix.
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</description>
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</method>
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<method name="is_equal_approx" qualifiers="const">
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<return type="bool" />
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<param index="0" name="b" type="Basis" />
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<description>
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Returns [code]true[/code] if this basis and [param b] are approximately equal, by calling [code]is_equal_approx[/code] on each component.
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</description>
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</method>
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<method name="is_finite" qualifiers="const">
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<return type="bool" />
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<description>
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Returns [code]true[/code] if this basis is finite, by calling [method @GlobalScope.is_finite] on each component.
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</description>
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</method>
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<method name="looking_at" qualifiers="static">
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<return type="Basis" />
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<param index="0" name="target" type="Vector3" />
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<param index="1" name="up" type="Vector3" default="Vector3(0, 1, 0)" />
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<param index="2" name="use_model_front" type="bool" default="false" />
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<description>
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Creates a Basis with a rotation such that the forward axis (-Z) points towards the [param target] position.
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The up axis (+Y) points as close to the [param up] vector as possible while staying perpendicular to the forward axis. The resulting Basis is orthonormalized. The [param target] and [param up] vectors cannot be zero, and cannot be parallel to each other.
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If [param use_model_front] is [code]true[/code], the +Z axis (asset front) is treated as forward (implies +X is left) and points toward the [param target] position. By default, the -Z axis (camera forward) is treated as forward (implies +X is right).
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</description>
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</method>
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<method name="orthonormalized" qualifiers="const">
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<return type="Basis" />
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<description>
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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.
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</description>
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</method>
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<method name="rotated" qualifiers="const">
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<return type="Basis" />
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<param index="0" name="axis" type="Vector3" />
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<param index="1" name="angle" type="float" />
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<description>
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Introduce an additional rotation around the given axis by [param angle] (in radians). The axis must be a normalized vector.
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</description>
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</method>
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<method name="scaled" qualifiers="const">
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<return type="Basis" />
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<param index="0" name="scale" type="Vector3" />
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<description>
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Introduce an additional scaling specified by the given 3D scaling factor.
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</description>
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</method>
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<method name="slerp" qualifiers="const">
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<return type="Basis" />
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<param index="0" name="to" type="Basis" />
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<param index="1" name="weight" type="float" />
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<description>
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Assuming that the matrix is a proper rotation matrix, slerp performs a spherical-linear interpolation with another rotation matrix.
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</description>
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</method>
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<method name="tdotx" qualifiers="const">
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<return type="float" />
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<param index="0" name="with" type="Vector3" />
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<description>
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Transposed dot product with the X axis of the matrix.
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</description>
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</method>
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<method name="tdoty" qualifiers="const">
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<return type="float" />
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<param index="0" name="with" type="Vector3" />
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<description>
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Transposed dot product with the Y axis of the matrix.
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</description>
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</method>
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<method name="tdotz" qualifiers="const">
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<return type="float" />
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<param index="0" name="with" type="Vector3" />
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<description>
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Transposed dot product with the Z axis of the matrix.
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</description>
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</method>
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<method name="transposed" qualifiers="const">
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<return type="Basis" />
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<description>
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Returns the transposed version of the matrix.
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</description>
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</method>
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</methods>
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<members>
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<member name="x" type="Vector3" setter="" getter="" default="Vector3(1, 0, 0)">
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The basis matrix's X vector (column 0). Equivalent to array index [code]0[/code].
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</member>
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<member name="y" type="Vector3" setter="" getter="" default="Vector3(0, 1, 0)">
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The basis matrix's Y vector (column 1). Equivalent to array index [code]1[/code].
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</member>
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<member name="z" type="Vector3" setter="" getter="" default="Vector3(0, 0, 1)">
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The basis matrix's Z vector (column 2). Equivalent to array index [code]2[/code].
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</member>
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</members>
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<constants>
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<constant name="IDENTITY" value="Basis(1, 0, 0, 0, 1, 0, 0, 0, 1)">
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The identity basis, with no rotation or scaling applied.
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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#.
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</constant>
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<constant name="FLIP_X" value="Basis(-1, 0, 0, 0, 1, 0, 0, 0, 1)">
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The basis that will flip something along the X axis when used in a transformation.
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</constant>
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<constant name="FLIP_Y" value="Basis(1, 0, 0, 0, -1, 0, 0, 0, 1)">
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The basis that will flip something along the Y axis when used in a transformation.
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</constant>
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<constant name="FLIP_Z" value="Basis(1, 0, 0, 0, 1, 0, 0, 0, -1)">
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The basis that will flip something along the Z axis when used in a transformation.
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</constant>
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</constants>
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<operators>
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<operator name="operator !=">
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<return type="bool" />
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<param index="0" name="right" type="Basis" />
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<description>
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Returns [code]true[/code] if the [Basis] matrices are not equal.
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[b]Note:[/b] Due to floating-point precision errors, consider using [method is_equal_approx] instead, which is more reliable.
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</description>
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</operator>
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<operator name="operator *">
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<return type="Basis" />
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<param index="0" name="right" type="Basis" />
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<description>
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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).
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</description>
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</operator>
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<operator name="operator *">
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<return type="Vector3" />
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<param index="0" name="right" type="Vector3" />
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<description>
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Transforms (multiplies) the [Vector3] by the given [Basis] matrix.
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</description>
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</operator>
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<operator name="operator *">
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<return type="Basis" />
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<param index="0" name="right" type="float" />
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<description>
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This operator multiplies all components of the [Basis], which scales it uniformly.
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</description>
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</operator>
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<operator name="operator *">
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<return type="Basis" />
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<param index="0" name="right" type="int" />
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<description>
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This operator multiplies all components of the [Basis], which scales it uniformly.
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</description>
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</operator>
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<operator name="operator ==">
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<return type="bool" />
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<param index="0" name="right" type="Basis" />
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<description>
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Returns [code]true[/code] if the [Basis] matrices are exactly equal.
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[b]Note:[/b] Due to floating-point precision errors, consider using [method is_equal_approx] instead, which is more reliable.
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</description>
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</operator>
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<operator name="operator []">
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<return type="Vector3" />
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<param index="0" name="index" type="int" />
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<description>
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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].
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</description>
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</operator>
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</operators>
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</class>
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