Matrix4

Members

<static> COLUMN0ROW0

The index into Matrix4 for column 0, row 0.

<static> COLUMN0ROW1

The index into Matrix4 for column 0, row 1.

<static> COLUMN0ROW2

The index into Matrix4 for column 0, row 2.

<static> COLUMN0ROW3

The index into Matrix4 for column 0, row 3.

<static> COLUMN1ROW0

The index into Matrix4 for column 1, row 0.

<static> COLUMN1ROW1

The index into Matrix4 for column 1, row 1.

<static> COLUMN1ROW2

The index into Matrix4 for column 1, row 2.

<static> COLUMN1ROW3

The index into Matrix4 for column 1, row 3.

<static> COLUMN2ROW0

The index into Matrix4 for column 2, row 0.

<static> COLUMN2ROW1

The index into Matrix4 for column 2, row 1.

<static> COLUMN2ROW2

The index into Matrix4 for column 2, row 2.

<static> COLUMN2ROW3

The index into Matrix4 for column 2, row 3.

<static> COLUMN3ROW0

The index into Matrix4 for column 3, row 0.

<static> COLUMN3ROW1

The index into Matrix4 for column 3, row 1.

<static> COLUMN3ROW2

The index into Matrix4 for column 3, row 2.

<static> COLUMN3ROW3

The index into Matrix4 for column 3, row 3.

<static> fromArray

Creates a Matrix4 from 16 consecutive elements in an array.

Example

// Create the Matrix4:
// [1.0, 2.0, 3.0, 4.0]
// [1.0, 2.0, 3.0, 4.0]
// [1.0, 2.0, 3.0, 4.0]
// [1.0, 2.0, 3.0, 4.0]

var v = [1.0, 1.0, 1.0, 1.0, 2.0, 2.0, 2.0, 2.0, 3.0, 3.0, 3.0, 3.0, 4.0, 4.0, 4.0, 4.0];
var m = Cesium.Matrix4.fromArray(v);

// Create same Matrix4 with using an offset into an array
var v2 = [0.0, 0.0, 1.0, 1.0, 1.0, 1.0, 2.0, 2.0, 2.0, 2.0, 3.0, 3.0, 3.0, 3.0, 4.0, 4.0, 4.0, 4.0];
var m2 = Cesium.Matrix4.fromArray(v2, 2);

<static> IDENTITY

An immutable Matrix4 instance initialized to the identity matrix.

<static> packedLength :Number

The number of elements used to pack the object into an array.

Methods

clone

Duplicates the provided Matrix4 instance.

Parameters:

Name	Type	Argument	Description
result	Matrix4	<optional>	The object onto which to store the result.

Returns:

Matrix4 The modified result parameter or a new Matrix4 instance if one was not provided.

equals

Compares this matrix to the provided matrix componentwise and returns true if they are equal, false otherwise.

Parameters:

Name	Type	Argument	Description
right	Matrix4	<optional>	The right hand side matrix.

Returns:

Boolean true if they are equal, false otherwise.

equalsEpsilon

Compares this matrix to the provided matrix componentwise and returns true if they are within the provided epsilon, false otherwise.

Parameters:

Name	Type	Argument	Description
right	Matrix4	<optional>	The right hand side matrix.
epsilon	Number		The epsilon to use for equality testing.

Returns:

Boolean true if they are within the provided epsilon, false otherwise.

toString

Computes a string representing this Matrix with each row being on a separate line and in the format '(column0, column1, column2, column3)'.

Returns:

String A string representing the provided Matrix with each row being on a separate line and in the format '(column0, column1, column2, column3)'.

<static> abs

Computes a matrix, which contains the absolute (unsigned) values of the provided matrix's elements.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix with signed elements.
result	Matrix4	<optional>	The object onto which to store the result.

Returns:

Matrix4 The modified result parameter or a new Matrix4 instance if one was not provided.

<static> clone

Duplicates a Matrix4 instance.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix to duplicate.
result	Matrix4	<optional>	The object onto which to store the result.

Returns:

Matrix4 The modified result parameter or a new Matrix4 instance if one was not provided. (Returns undefined if matrix is undefined)

<static> computeInfinitePerspectiveOffCenter

Computes a Matrix4 instance representing an infinite off center perspective transformation.

Parameters:

Name	Type	Argument	Description
left	Number		The number of meters to the left of the camera that will be in view.
right	Number		The number of meters to the right of the camera that will be in view.
bottom	Number		The number of meters below of the camera that will be in view.
top	Number		The number of meters above of the camera that will be in view.
near	Number		The distance to the near plane in meters.
far	Number		The distance to the far plane in meters.
result	Matrix4	<optional>	The object in which the result will be stored, if undefined a new instance will be created.

Returns:

The modified result parameter, or a new Matrix4 instance if one was not provided.

<static> computeOrthographicOffCenter

Computes a Matrix4 instance representing an orthographic transformation matrix.

Parameters:

Name	Type	Argument	Description
left	Number		The number of meters to the left of the camera that will be in view.
right	Number		The number of meters to the right of the camera that will be in view.
bottom	Number		The number of meters below of the camera that will be in view.
top	Number		The number of meters above of the camera that will be in view.
near	Number		The distance to the near plane in meters.
far	Number		The distance to the far plane in meters.
result	Matrix4	<optional>	The object in which the result will be stored, if undefined a new instance will be created.

Returns:

The modified result parameter, or a new Matrix4 instance if one was not provided.

<static> computePerspectiveFieldOfView

Computes a Matrix4 instance representing a perspective transformation matrix.

Parameters:

Name	Type	Argument	Description
fovY	Number		The field of view along the Y axis in radians.
aspectRatio	Number		The aspect ratio.
near	Number		The distance to the near plane in meters.
far	Number		The distance to the far plane in meters.
result	Matrix4	<optional>	The object in which the result will be stored, if undefined a new instance will be created.

Throws:

• DeveloperError : fovY must be in [0, PI).
• DeveloperError : aspectRatio must be greater than zero.
• DeveloperError : near must be greater than zero.
• DeveloperError : far must be greater than zero.

Returns:

The modified result parameter, or a new Matrix4 instance if one was not provided.

<static> computePerspectiveOffCenter

Computes a Matrix4 instance representing an off center perspective transformation.

Parameters:

Name	Type	Argument	Description
left	Number		The number of meters to the left of the camera that will be in view.
right	Number		The number of meters to the right of the camera that will be in view.
bottom	Number		The number of meters below of the camera that will be in view.
top	Number		The number of meters above of the camera that will be in view.
near	Number		The distance to the near plane in meters.
far	Number		The distance to the far plane in meters.
result	Matrix4	<optional>	The object in which the result will be stored, if undefined a new instance will be created.

Returns:

The modified result parameter, or a new Matrix4 instance if one was not provided.

<static> computeViewportTransformation

Computes a Matrix4 instance that transforms from normalized device coordinates to window coordinates.

Parameters:

Name	Type	Argument	Default	Description
viewport	Object	<optional>	{ x : 0.0, y : 0.0, width : 0.0, height : 0.0 }	The viewport's corners as shown in Example 1.
nearDepthRange	Number	<optional>	0.0	The near plane distance in window coordinates.
farDepthRange	Number	<optional>	1.0	The far plane distance in window coordinates.
result	Matrix4	<optional>		The object in which the result will be stored, if undefined a new instance will be created.

Returns:

The modified result parameter, or a new Matrix4 instance if one was not provided.

Example

// Example 1.  Create viewport transformation using an explicit viewport and depth range.
var m = Cesium.Matrix4.computeViewportTransformation({
    x : 0.0,
    y : 0.0,
    width : 1024.0,
    height : 768.0
}, 0.0, 1.0);

// Example 2.  Create viewport transformation using the context's viewport.
var m = Cesium.Matrix4.computeViewportTransformation(context.getViewport());

See:

• czm_viewportTransformation
• Context#getViewport

<static> equals

Compares the provided matrices componentwise and returns true if they are equal, false otherwise.

Parameters:

Name	Type	Argument	Description
left	Matrix4	<optional>	The first matrix.
right	Matrix4	<optional>	The second matrix.

Returns:

Boolean true if left and right are equal, false otherwise.

Example

//compares two Matrix4 instances

// a = [10.0, 14.0, 18.0, 22.0]
//     [11.0, 15.0, 19.0, 23.0]
//     [12.0, 16.0, 20.0, 24.0]
//     [13.0, 17.0, 21.0, 25.0]

// b = [10.0, 14.0, 18.0, 22.0]
//     [11.0, 15.0, 19.0, 23.0]
//     [12.0, 16.0, 20.0, 24.0]
//     [13.0, 17.0, 21.0, 25.0]

if(Cesium.Matrix4.equals(a,b)) {
     console.log("Both matrices are equal");
} else {
     console.log("They are not equal");
}

//Prints "Both matrices are equal" on the console

<static> equalsEpsilon

Compares the provided matrices componentwise and returns true if they are within the provided epsilon, false otherwise.

Parameters:

Name	Type	Argument	Description
left	Matrix4	<optional>	The first matrix.
right	Matrix4	<optional>	The second matrix.
epsilon	Number		The epsilon to use for equality testing.

Returns:

Boolean true if left and right are within the provided epsilon, false otherwise.

Example

//compares two Matrix4 instances

// a = [10.5, 14.5, 18.5, 22.5]
//     [11.5, 15.5, 19.5, 23.5]
//     [12.5, 16.5, 20.5, 24.5]
//     [13.5, 17.5, 21.5, 25.5]

// b = [10.0, 14.0, 18.0, 22.0]
//     [11.0, 15.0, 19.0, 23.0]
//     [12.0, 16.0, 20.0, 24.0]
//     [13.0, 17.0, 21.0, 25.0]

if(Cesium.Matrix4.equalsEpsilon(a,b,0.1)){
     console.log("Difference between both the matrices is less than 0.1");
} else {
     console.log("Difference between both the matrices is not less than 0.1");
}

//Prints "Difference between both the matrices is not less than 0.1" on the console

<static> fromCamera

Computes a Matrix4 instance from a Camera.

Parameters:

Name	Type	Argument	Description
camera	Camera		The camera to use.
result	Matrix4	<optional>	The object in which the result will be stored, if undefined a new instance will be created.

Returns:

The modified result parameter, or a new Matrix4 instance if one was not provided.

<static> fromColumnMajorArray

Computes a Matrix4 instance from a column-major order array.

Parameters:

Name	Type	Argument	Description
values	Array		The column-major order array.
result	Matrix4	<optional>	The object in which the result will be stored, if undefined a new instance will be created.

Returns:

The modified result parameter, or a new Matrix4 instance if one was not provided.

<static> fromRotationTranslation

Computes a Matrix4 instance from a Matrix3 representing the rotation and a Cartesian3 representing the translation.

Parameters:

Name	Type	Argument	Description
rotation	Matrix3		The upper left portion of the matrix representing the rotation.
translation	Cartesian3		The upper right portion of the matrix representing the translation.
result	Matrix4	<optional>	The object in which the result will be stored, if undefined a new instance will be created.

Returns:

The modified result parameter, or a new Matrix4 instance if one was not provided.

<static> fromRowMajorArray

Computes a Matrix4 instance from a row-major order array. The resulting matrix will be in column-major order.

Parameters:

Name	Type	Argument	Description
values	Array		The row-major order array.
result	Matrix4	<optional>	The object in which the result will be stored, if undefined a new instance will be created.

Returns:

The modified result parameter, or a new Matrix4 instance if one was not provided.

<static> fromScale

Computes a Matrix4 instance representing a non-uniform scale.

Parameters:

Name	Type	Argument	Description
scale	Cartesian3		The x, y, and z scale factors.
result	Matrix4	<optional>	The object in which the result will be stored, if undefined a new instance will be created.

Returns:

The modified result parameter, or a new Matrix4 instance if one was not provided.

Example

// Creates
//   [7.0, 0.0, 0.0, 0.0]
//   [0.0, 8.0, 0.0, 0.0]
//   [0.0, 0.0, 9.0, 0.0]
//   [0.0, 0.0, 0.0, 1.0]
var m = Cesium.Matrix4.fromScale(new Cartesian3(7.0, 8.0, 9.0));

<static> fromTranslation

Creates a Matrix4 instance from a Cartesian3 representing the translation.

Parameters:

Name	Type	Argument	Description
translation	Cartesian3		The upper right portion of the matrix representing the translation.
result	Matrix4	<optional>	The object in which the result will be stored, if undefined a new instance will be created.

Returns:

The modified result parameter, or a new Matrix4 instance if one was not provided.

See:

• Matrix4.multiplyByTranslation

<static> fromTranslationQuaternionRotationScale

Computes a Matrix4 instance from a translation, rotation, and scale (TRS) representation with the rotation represented as a quaternion.

Parameters:

Name	Type	Argument	Description
translation	Cartesian3		The translation transformation.
rotation	Quaternion		The rotation transformation.
scale	Cartesian3		The non-uniform scale transformation.
result	Matrix4	<optional>	The object in which the result will be stored, if undefined a new instance will be created.

Returns:

The modified result parameter, or a new Matrix4 instance if one was not provided.

Example

result = Cesium.Matrix4.fromTranslationQuaternionRotationScale(
  new Cesium.Cartesian3(1.0, 2.0, 3.0), // translation
  Cesium.Quaternion.IDENTITY,           // rotation
  new Cesium.Cartesian3(7.0, 8.0, 9.0), // scale
  result);

<static> fromUniformScale

Computes a Matrix4 instance representing a uniform scale.

Parameters:

Name	Type	Argument	Description
scale	Number		The uniform scale factor.
result	Matrix4	<optional>	The object in which the result will be stored, if undefined a new instance will be created.

Returns:

The modified result parameter, or a new Matrix4 instance if one was not provided.

Example

// Creates
//   [2.0, 0.0, 0.0, 0.0]
//   [0.0, 2.0, 0.0, 0.0]
//   [0.0, 0.0, 2.0, 0.0]
//   [0.0, 0.0, 0.0, 1.0]
var m = Cesium.Matrix4.fromScale(2.0);

<static> getColumn

Retrieves a copy of the matrix column at the provided index as a Cartesian4 instance.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix to use.
index	Number		The zero-based index of the column to retrieve.
result	Cartesian4	<optional>	The object onto which to store the result.

Throws:

DeveloperError : index must be 0, 1, 2, or 3.

Returns:

Cartesian4 The modified result parameter or a new Cartesian4 instance if one was not provided.

Example

//returns a Cartesian4 instance with values from the specified column
// m = [10.0, 11.0, 12.0, 13.0]
//     [14.0, 15.0, 16.0, 17.0]
//     [18.0, 19.0, 20.0, 21.0]
//     [22.0, 23.0, 24.0, 25.0]

//Example 1: Creates an instance of Cartesian
var a = Cesium.Matrix4.getColumn(m, 2);

//Example 2: Sets values for Cartesian instance
var a = new Cesium.Cartesian4();
Cesium.Matrix4.getColumn(m, 2, a);

// a.x = 12.0; a.y = 16.0; a.z = 20.0; a.w = 24.0;

See:

• Cartesian4

<static> getElementIndex

Computes the array index of the element at the provided row and column.

Parameters:

Name	Type	Description
row	Number	The zero-based index of the row.
column	Number	The zero-based index of the column.

Throws:

• DeveloperError : row must be 0, 1, 2, or 3.
• DeveloperError : column must be 0, 1, 2, or 3.

Returns:

Number The index of the element at the provided row and column.

Example

var myMatrix = new Cesium.Matrix4();
var column1Row0Index = Cesium.Matrix4.getElementIndex(1, 0);
var column1Row0 = myMatrix[column1Row0Index]
myMatrix[column1Row0Index] = 10.0;

<static> getMaximumScale

Computes the maximum scale assuming the matrix is an affine transformation. The maximum scale is the maximum length of the column vectors in the upper-left 3x3 matrix.

Parameters:

Name	Type	Description
matrix	Matrix4	The matrix.

Returns:

Number The maximum scale.

<static> getRotation

Gets the upper left 3x3 rotation matrix of the provided matrix, assuming the matrix is a affine transformation matrix.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix to use.
result	Matrix3	<optional>	The object onto which to store the result.

Returns:

Matrix3 The modified result parameter or a new Cartesian3 instance if one was not provided.

Example

// returns a Matrix3 instance from a Matrix4 instance

// m = [10.0, 14.0, 18.0, 22.0]
//     [11.0, 15.0, 19.0, 23.0]
//     [12.0, 16.0, 20.0, 24.0]
//     [13.0, 17.0, 21.0, 25.0]

var b = new Cesium.Matrix3();
Cesium.Matrix4.getRotation(m,b);

// b = [10.0, 14.0, 18.0]
//     [11.0, 15.0, 19.0]
//     [12.0, 16.0, 20.0]

See:

• Matrix3

<static> getRow

Retrieves a copy of the matrix row at the provided index as a Cartesian4 instance.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix to use.
index	Number		The zero-based index of the row to retrieve.
result	Cartesian4	<optional>	The object onto which to store the result.

Throws:

DeveloperError : index must be 0, 1, 2, or 3.

Returns:

Cartesian4 The modified result parameter or a new Cartesian4 instance if one was not provided.

Example

//returns a Cartesian4 instance with values from the specified column
// m = [10.0, 11.0, 12.0, 13.0]
//     [14.0, 15.0, 16.0, 17.0]
//     [18.0, 19.0, 20.0, 21.0]
//     [22.0, 23.0, 24.0, 25.0]

//Example 1: Returns an instance of Cartesian
var a = Cesium.Matrix4.getRow(m, 2);

//Example 1: Sets values for a Cartesian instance
var a = new Cartesian4();
Cesium.Matrix4.getRow(m, 2, a);

// a.x = 18.0; a.y = 19.0; a.z = 20.0; a.w = 21.0;

See:

• Cartesian4

<static> getScale

Extracts the non-uniform scale assuming the matrix is an affine transformation.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix.
result	Cartesian3	<optional>	The object onto which to store the result.

Returns:

Cartesian3 The modified result parameter or a new Cartesian3 instance if one was not provided.

<static> getTranslation

Gets the translation portion of the provided matrix, assuming the matrix is a affine transformation matrix.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix to use.
result	Cartesian3	<optional>	The object onto which to store the result.

Returns:

Cartesian3 The modified result parameter or a new Cartesian3 instance if one was not provided.

See:

• Cartesian3

<static> inverse

Computes the inverse of the provided matrix using Cramers Rule. If the determinant is zero, the matrix can not be inverted, and an exception is thrown. If the matrix is an affine transformation matrix, it is more efficient to invert it with #inverseTransformation.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix to invert.
result	Matrix4	<optional>	The object onto which to store the result.

Throws:

RuntimeError : matrix is not invertible because its determinate is zero.

Returns:

Matrix4 The modified result parameter or a new Cartesian3 instance if one was not provided.

<static> inverseTransformation

Computes the inverse of the provided matrix assuming it is an affine transformation matrix, where the upper left 3x3 elements are a rotation matrix, and the upper three elements in the fourth column are the translation. The bottom row is assumed to be [0, 0, 0, 1]. The matrix is not verified to be in the proper form. This method is faster than computing the inverse for a general 4x4 matrix using #inverse.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix to invert.
result	Matrix4	<optional>	The object onto which to store the result.

Returns:

Matrix4 The modified result parameter or a new Cartesian3 instance if one was not provided.

<static> multiply

Computes the product of two matrices.

Parameters:

Name	Type	Argument	Description
left	Matrix4		The first matrix.
right	Matrix4		The second matrix.
result	Matrix4	<optional>	The object onto which to store the result.

Returns:

Matrix4 The modified result parameter or a new Matrix4 instance if one was not provided.

<static> multiplyByPoint

Computes the product of a matrix and a Cartesian3. This is equivalent to calling Matrix4.multiplyByVector with a Cartesian4 with a w component of 1, but returns a Cartesian3 instead of a Cartesian4.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix.
cartesian	Cartesian3		The point.
result	Cartesian3	<optional>	The object onto which to store the result.

Returns:

Cartesian3 The modified result parameter or a new Cartesian3 instance if one was not provided.

Example

var p = new Cesium.Cartesian3(1.0, 2.0, 3.0);
Cesium.Matrix4.multiplyByPoint(matrix, p, result);

<static> multiplyByPointAsVector

Computes the product of a matrix and a Cartesian3. This is equivalent to calling Matrix4.multiplyByVector with a Cartesian4 with a w component of zero.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix.
cartesian	Cartesian3		The point.
result	Cartesian3	<optional>	The object onto which to store the result.

Returns:

Cartesian3 The modified result parameter or a new Cartesian3 instance if one was not provided.

Example

var p = new Cesium.Cartesian3(1.0, 2.0, 3.0);
Cesium.Matrix4.multiplyByPointAsVector(matrix, p, result);
// A shortcut for
//   Cartesian3 p = ...
//   Cesium.Matrix4.multiplyByVector(matrix, new Cesium.Cartesian4(p.x, p.y, p.z, 0.0), result);

<static> multiplyByScalar

Computes the product of a matrix and a scalar.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix.
scalar	Number		The number to multiply by.
result	Matrix4	<optional>	The object onto which to store the result.

Returns:

Matrix4 The modified result parameter or a new Cartesian4 instance if one was not provided.

Example

//create a Matrix4 instance which is a scaled version of the supplied Matrix4
// m = [10.0, 11.0, 12.0, 13.0]
//     [14.0, 15.0, 16.0, 17.0]
//     [18.0, 19.0, 20.0, 21.0]
//     [22.0, 23.0, 24.0, 25.0]

var a = Cesium.Matrix4.multiplyByScalar(m, -2);

// m remains the same
// a = [-20.0, -22.0, -24.0, -26.0]
//     [-28.0, -30.0, -32.0, -34.0]
//     [-36.0, -38.0, -40.0, -42.0]
//     [-44.0, -46.0, -48.0, -50.0]

<static> multiplyByScale

Multiplies a transformation matrix (with a bottom row of [0.0, 0.0, 0.0, 1.0]) by an implicit non-uniform scale matrix. This is an optimization for Matrix4.multiply(m, Matrix4.fromScale(scale), m); with less allocations and arithmetic operations.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix on the left-hand side.
scale	Cartesian3		The non-uniform scale on the right-hand side.
result	Matrix4	<optional>	The object onto which to store the result.

Returns:

Matrix4 The modified result parameter or a new Matrix4 instance if one was not provided.

Example

// Instead of Matrix4.multiply(m, Cesium.Matrix4.fromScale(scale), m);
Cesium.Matrix4.multiplyByUniformScale(m, scale, m);

See:

• Matrix4.fromScale
• Matrix4.multiplyByUniformScale

<static> multiplyByTranslation

Multiplies a transformation matrix (with a bottom row of [0.0, 0.0, 0.0, 1.0]) by an implicit translation matrix defined by a Cartesian3. This is an optimization for Matrix4.multiply(m, Matrix4.fromTranslation(position), m); with less allocations and arithmetic operations.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix on the left-hand side.
translation	Cartesian3		The translation on the right-hand side.
result	Matrix4	<optional>	The object onto which to store the result.

Returns:

Matrix4 The modified result parameter or a new Matrix4 instance if one was not provided.

Example

// Instead of Matrix4.multiply(m, Cesium.Matrix4.fromTranslation(position), m);
Cesium.Matrix4.multiplyByTranslation(m, position, m);

See:

• Matrix4.fromTranslation

<static> multiplyByUniformScale

Multiplies a transformation matrix (with a bottom row of [0.0, 0.0, 0.0, 1.0]) by an implicit uniform scale matrix. This is an optimization for Matrix4.multiply(m, Matrix4.fromUniformScale(scale), m); with less allocations and arithmetic operations.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix on the left-hand side.
scale	Number		The uniform scale on the right-hand side.
result	Matrix4	<optional>	The object onto which to store the result.

Returns:

Matrix4 The modified result parameter or a new Matrix4 instance if one was not provided.

Example

// Instead of Matrix4.multiply(m, Cesium.Matrix4.fromUniformScale(scale), m);
Cesium.Matrix4.multiplyByUniformScale(m, scale, m);

See:

• Matrix4.fromUniformScale
• Matrix4.multiplyByScale

<static> multiplyByVector

Computes the product of a matrix and a column vector.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix.
cartesian	Cartesian4		The vector.
result	Cartesian4	<optional>	The object onto which to store the result.

Returns:

Cartesian4 The modified result parameter or a new Cartesian4 instance if one was not provided.

<static> multiplyTransformation

Computes the product of two matrices assuming the matrices are affine transformation matrices, where the upper left 3x3 elements are a rotation matrix, and the upper three elements in the fourth column are the translation. The bottom row is assumed to be [0, 0, 0, 1]. The matrix is not verified to be in the proper form. This method is faster than computing the product for general 4x4 matrices using multiply.

Parameters:

Name	Type	Argument	Description
left	Matrix4		The first matrix.
right	Matrix4		The second matrix.
result	Matrix4	<optional>	The object onto which to store the result.

Returns:

Matrix4 The modified result parameter or a new Matrix4 instance if one was not provided.

Example

var m1 = new Cesium.Matrix4(1.0, 6.0, 7.0, 0.0, 2.0, 5.0, 8.0, 0.0, 3.0, 4.0, 9.0, 0.0, 0.0, 0.0, 0.0, 1.0];
var m2 = Cesium.Transforms.eastNorthUpToFixedFrame(new Cesium.Cartesian3(1.0, 1.0, 1.0));
var m3 = Cesium.Matrix4.multiplyTransformation(m1, m2);

<static> negate

Computes a negated copy of the provided matrix.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix to negate.
result	Matrix4	<optional>	The object onto which to store the result.

Returns:

Matrix4 The modified result parameter or a new Matrix4 instance if one was not provided.

Example

//create a new Matrix4 instance which is a negation of a Matrix4
// m = [10.0, 11.0, 12.0, 13.0]
//     [14.0, 15.0, 16.0, 17.0]
//     [18.0, 19.0, 20.0, 21.0]
//     [22.0, 23.0, 24.0, 25.0]

var a = Cesium.Matrix4.negate(m);

// m remains the same
// a = [-10.0, -11.0, -12.0, -13.0]
//     [-14.0, -15.0, -16.0, -17.0]
//     [-18.0, -19.0, -20.0, -21.0]
//     [-22.0, -23.0, -24.0, -25.0]

<static> pack

Stores the provided instance into the provided array.

Parameters:

Name	Type	Argument	Default	Description
value	Matrix4			The value to pack.
array	Array			The array to pack into.
startingIndex	Number	<optional>	0	The index into the array at which to start packing the elements.

<static> setColumn

Computes a new matrix that replaces the specified column in the provided matrix with the provided Cartesian4 instance.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix to use.
index	Number		The zero-based index of the column to set.
cartesian	Cartesian4		The Cartesian whose values will be assigned to the specified column.
result	Cartesian4	<optional>	The object onto which to store the result.

Throws:

DeveloperError : index must be 0, 1, 2, or 3.

Returns:

Matrix4 The modified result parameter or a new Matrix4 instance if one was not provided.

Example

//creates a new Matrix4 instance with new column values from the Cartesian4 instance
// m = [10.0, 11.0, 12.0, 13.0]
//     [14.0, 15.0, 16.0, 17.0]
//     [18.0, 19.0, 20.0, 21.0]
//     [22.0, 23.0, 24.0, 25.0]

var a = Cesium.Matrix4.setColumn(m, 2, new Cartesian4(99.0, 98.0, 97.0, 96.0));

// m remains the same
// a = [10.0, 11.0, 99.0, 13.0]
//     [14.0, 15.0, 98.0, 17.0]
//     [18.0, 19.0, 97.0, 21.0]
//     [22.0, 23.0, 96.0, 25.0]

See:

• Cartesian4

<static> setRow

Computes a new matrix that replaces the specified row in the provided matrix with the provided Cartesian4 instance.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix to use.
index	Number		The zero-based index of the row to set.
cartesian	Cartesian4		The Cartesian whose values will be assigned to the specified row.
result	Cartesian4	<optional>	The object onto which to store the result.

Throws:

DeveloperError : index must be 0, 1, 2, or 3.

Returns:

Matrix4 The modified result parameter or a new Matrix4 instance if one was not provided.

Example

//create a new Matrix4 instance with new row values from the Cartesian4 instance
// m = [10.0, 11.0, 12.0, 13.0]
//     [14.0, 15.0, 16.0, 17.0]
//     [18.0, 19.0, 20.0, 21.0]
//     [22.0, 23.0, 24.0, 25.0]

var a = Cesium.Matrix4.setRow(m, 2, new Cartesian4(99.0, 98.0, 97.0, 96.0));

// m remains the same
// a = [10.0, 11.0, 12.0, 13.0]
//     [14.0, 15.0, 16.0, 17.0]
//     [99.0, 98.0, 97.0, 96.0]
//     [22.0, 23.0, 24.0, 25.0]

See:

• Cartesian4

<static> toArray

Computes an Array from the provided Matrix4 instance. The array will be in column-major order.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix to use..
result	Array	<optional>	The Array onto which to store the result.

Returns:

Array The modified Array parameter or a new Array instance if one was not provided.

Example

//create an array from an instance of Matrix4
// m = [10.0, 14.0, 18.0, 22.0]
//     [11.0, 15.0, 19.0, 23.0]
//     [12.0, 16.0, 20.0, 24.0]
//     [13.0, 17.0, 21.0, 25.0]
var a = Cesium.Matrix4.toArray(m);

// m remains the same
//creates a = [10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0, 17.0, 18.0, 19.0, 20.0, 21.0, 22.0, 23.0, 24.0, 25.0]

<static> transpose

Computes the transpose of the provided matrix.

Parameters:

Name	Type	Argument	Description
matrix	Matrix4		The matrix to transpose.
result	Matrix4	<optional>	The object onto which to store the result.

Returns:

Matrix4 The modified result parameter or a new Matrix4 instance if one was not provided.

Example

//returns transpose of a Matrix4
// m = [10.0, 11.0, 12.0, 13.0]
//     [14.0, 15.0, 16.0, 17.0]
//     [18.0, 19.0, 20.0, 21.0]
//     [22.0, 23.0, 24.0, 25.0]

var a = Cesium.Matrix4.negate(m);

// m remains the same
// a = [10.0, 14.0, 18.0, 22.0]
//     [11.0, 15.0, 19.0, 23.0]
//     [12.0, 16.0, 20.0, 24.0]
//     [13.0, 17.0, 21.0, 25.0]

<static> unpack

Retrieves an instance from a packed array.

Parameters:

Name	Type	Argument	Default	Description
array	Array			The packed array.
startingIndex	Number	<optional>	0	The starting index of the element to be unpacked.
result	Matrix4	<optional>		The object into which to store the result.