Class Matrix3

constructor

• new Matrix3(): Matrix3

  Creates a new Matrix3 and initializes it to the identity matrix.

  Returns Matrix3

data

getNormalMatrix

• getNormalMatrix(m: { data: Float32Array }): this

  Calculates the normal matrix (transpose of the inverse of the upper-left 3x3 of a 4x4 matrix). Used for transforming normals correctly when non-uniform scaling is present.

  Parameters

  • m: { data: Float32Array }

    The source 4x4 matrix.

  Returns this

  this

identity

• identity(): this

  Sets the matrix to the identity matrix.

  Returns this

  this

setFromMatrix4

• setFromMatrix4(m: { data: Float32Array }): this

  Sets the matrix from the upper-left 3x3 part of a 4x4 matrix.

  Parameters

  • m: { data: Float32Array }

    The source 4x4 matrix.

  Returns this

  this

transformVector

• transformVector(
      v: { x: number; y: number; z: number },
      result?: { x: number; y: number; z: number },
  ): { x: number; y: number; z: number }

  Transforms a Vector3D by this 3x3 matrix (result = M * v).

  Parameters

  • v: { x: number; y: number; z: number }

    The vector to transform.

  • result: { x: number; y: number; z: number } = v

    Optional target vector (defaults to v).

  Returns { x: number; y: number; z: number }

  The transformed vector.

Staticmultiply

• multiply(a: Matrix3, b: Matrix3, out: Matrix3): void

  Multiplies two 3x3 matrices and stores the result in out.

  Parameters

  • a: Matrix3

    The first matrix.

  • b: Matrix3

    The second matrix.

  • out: Matrix3

    The output matrix.

  Returns void