Version: 2019.4
LanguageEnglish
• C#

# Matrix4x4

struct in UnityEngine

/

Implemented in:UnityEngine.CoreModule

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### Description

A standard 4x4 transformation matrix.

A transformation matrix can perform arbitrary linear 3D transformations (i.e. translation, rotation, scale, shear etc.) and perspective transformations using homogenous coordinates. You rarely use matrices in scripts; most often using Vector3s, Quaternions and functionality of Transform class is more straightforward. Plain matrices are used in special cases like setting up nonstandard camera projection.

In Unity, several Transform, Camera, Material, Graphics and GL functions use Matrix4x4.

Matrices in Unity are column major; i.e. the position of a transformation matrix is in the last column, and the first three columns contain x, y, and z-axes. Data is accessed as: `row + (column*4)`. Matrices can be indexed like 2D arrays but note that in an expression like `mat[a, b]`, `a` refers to the row index, while `b` refers to the column index.

```using UnityEngine;public class ExampleScript : MonoBehaviour
{
void Start()
{
// get matrix from the Transform
var matrix = transform.localToWorldMatrix;
// get position from the last column
var position = new Vector3(matrix[0,3], matrix[1,3], matrix[2,3]);
Debug.Log("Transform position from matrix is: " + position);
}
}
```

### Static Properties

 identity Returns the identity matrix (Read Only). zero Returns a matrix with all elements set to zero (Read Only).

### Properties

 decomposeProjection This property takes a projection matrix and returns the six plane coordinates that define a projection frustum. determinant The determinant of the matrix. (Read Only) inverse The inverse of this matrix. (Read Only) isIdentity Checks whether this is an identity matrix. (Read Only) lossyScale Attempts to get a scale value from the matrix. (Read Only) rotation Attempts to get a rotation quaternion from this matrix. this[int,int] Access element at [row, column]. transpose Returns the transpose of this matrix (Read Only).

### Public Methods

 GetColumn Get a column of the matrix. GetRow Returns a row of the matrix. MultiplyPoint Transforms a position by this matrix (generic). MultiplyPoint3x4 Transforms a position by this matrix (fast). MultiplyVector Transforms a direction by this matrix. SetColumn Sets a column of the matrix. SetRow Sets a row of the matrix. SetTRS Sets this matrix to a translation, rotation and scaling matrix. ToString Returns a nicely formatted string for this matrix. TransformPlane Returns a plane that is transformed in space. ValidTRS Checks if this matrix is a valid transform matrix.

### Static Methods

 Frustum This function returns a projection matrix with viewing frustum that has a near plane defined by the coordinates that were passed in. Inverse3DAffine Computes the inverse of a 3D affine matrix. LookAt Create a "look at" matrix. Ortho Create an orthogonal projection matrix. Perspective Create a perspective projection matrix. Rotate Creates a rotation matrix. Scale Creates a scaling matrix. Translate Creates a translation matrix. TRS Creates a translation, rotation and scaling matrix.

### Operators

 operator * Multiplies two matrices.