# npm

## gl-mat3

2.0.0 • Public • Published

# gl-mat3 Part of a fork of @toji's gl-matrix split into smaller pieces: this package contains `glMatrix.mat3`.

## Usage ### `mat3 = require('gl-mat3')`

Will load all of the module's functionality and expose it on a single object. Note that any of the methods may also be required directly from their files.

For example, the following are equivalent:

## API

Calculates the adjugate of a mat3

## mat3.clone(a:mat3)

Creates a new mat3 initialized with values from an existing matrix

## mat3.copy(out:mat3, a:mat3)

Copy the values from one mat3 to another

## mat3.create()

Creates a new identity mat3

## mat3.determinant(a:mat3)

Calculates the determinant of a mat3

## mat3.frob(a:mat3)

Returns Frobenius norm of a mat3

## mat3.fromMat2d(out:mat3, a:mat2d)

Copies the values from a mat2d into a mat3

## mat3.fromMat4(out:mat3, a:mat4)

Copies the upper-left 3x3 values into the given mat3.

## mat3.fromQuat(out:mat3, q:quat)

Calculates a 3x3 matrix from the given quaternion

## mat3.identity(out:mat3)

Set a mat3 to the identity matrix

Inverts a mat3

## mat3.multiply(out:mat3, a:mat3, b:mat3)

Multiplies two mat3's

## mat3.normalFromMat4(out:mat3, a:mat4)

Calculates a 3x3 normal matrix (transpose inverse) from the 4x4 matrix

Rotates a mat3 by the given angle

## mat3.scale(out:mat3, a:mat3, v:vec2)

Scales the mat3 by the dimensions in the given vec2

## mat3.str(mat:mat3)

Returns a string representation of a mat3

## mat3.translate(out:mat3, a:mat3, v:vec2)

Translate a mat3 by the given vector

## mat3.transpose(out:mat3, a:mat3)

Transpose the values of a mat3