Method transformDirection

src/math/Vector3.js:525–539

* Transforms the direction of this vector by a matrix (the upper left 3 x 3 * subset of the given 4x4 matrix and then normalizes the result. * * @param {Matrix4} m - The matrix. * @return {Vector3} A reference to this vector.

( m )

	 * @return {Vector3} A reference to this vector.
	 */
	transformDirection( m ) {

		// input: THREE.Matrix4 affine matrix
		// vector interpreted as a direction

		const x = this.x, y = this.y, z = this.z;
		const e = m.elements;

		this.x = e[ 0 ] * x + e[ 4 ] * y + e[ 8 ] * z;
		this.y = e[ 1 ] * x + e[ 5 ] * y + e[ 9 ] * z;
		this.z = e[ 2 ] * x + e[ 6 ] * y + e[ 10 ] * z;

		return this.normalize();

	}

	/**
	 * Divides this instance by the given vector.