<!-- NEW5 — TEST 5 · THE BEND AT THE HEART · part 59 -->
* b43;
		te[ 14 ] = a31 * b14 + a32 * b24 + a33 * b34 + a34 * b44;

		te[ 3 ] = a41 * b11 + a42 * b21 + a43 * b31 + a44 * b41;
		te[ 7 ] = a41 * b12 + a42 * b22 + a43 * b32 + a44 * b42;
		te[ 11 ] = a41 * b13 + a42 * b23 + a43 * b33 + a44 * b43;
		te[ 15 ] = a41 * b14 + a42 * b24 + a43 * b34 + a44 * b44;

		return this;

	}

	/**
	 * Multiplies every component of the matrix by the given scalar.
	 *
	 * @param {number} s - The scalar.
	 * @return {Matrix4} A reference to this matrix.
	 */
	multiplyScalar( s ) {

		const te = this.elements;

		te[ 0 ] *= s; te[ 4 ] *= s; te[ 8 ] *= s; te[ 12 ] *= s;
		te[ 1 ] *= s; te[ 5 ] *= s; te[ 9 ] *= s; te[ 13 ] *= s;
		te[ 2 ] *= s; te[ 6 ] *= s; te[ 10 ] *= s; te[ 14 ] *= s;
		te[ 3 ] *= s; te[ 7 ] *= s; te[ 11 ] *= s; te[ 15 ] *= s;

		return this;

	}

	/**
	 * Computes and returns the determinant of this matrix.
	 *
	 * @return {number} The determinant.
	 */
	determinant() {

		const te = this.elements;

		const n11 = te[ 0 ], n12 = te[ 4 ], n13 = te[ 8 ], n14 = te[ 12 ];
		const n21 = te[ 1 ], n22 = te[ 5 ], n23 = te[ 9 ], n24 = te[ 13 ];
		const n31 = te[ 2 ], n32 = te[ 6 ], n33 = te[ 10 ], n34 = te[ 14 ];
		const n41 = te[ 3 ], n42 = te[ 7 ], n43 = te[ 11 ], n44 = te[ 15 ];

		const t11 = n23 * n34 - n24 * n33;
		const t12 = n22 * n34 - n24 * n32;
		const t13 = n22 * n33 - n23 * n32;

		const t21 = n21 * n34 - n24 * n31;
		const t22 = n21 * n33 - n23 * n31;
		const t23 = n21 * n32 - n22 * n31;

		return n11 * ( n42 * t11 - n43 * t12 + n44 * t13 ) -
			n12 * ( n41 * t11 - n43 * t21 + n44 * t22 ) +
			n13 * ( n41 * t12 - n42 * t21 + n44 * t23 ) -
			n14 * ( n41 * t13 - n42 * t22 + n43 * t23 );

	}

	/**
	 * Computes and returns the determinant of the 4x4 matrix, but assumes the
	 * matrix is affine, saving some computations.
	 *
	 * For affine matrices (like an object's world matrix), this value equals the
	 * full 4x4 {@link Matrix4#determinant} but is cheaper to compute.
	 *
	 * Assumes the bottom row is [0, 0, 0, 1].
	 *
	 * @return {number} The determinant of the matrix.
	 */
	determinantAffine() {

		const te = this.elements;

		const n11 = te[ 0 ], n12 = te[ 4 ], n13 = te[ 8 ];
		const n21 = te[ 1 ], n22 = te[ 5 ], n23 = te[ 9 ];
		const n31 = te[ 2 ], n32 = te[ 6 ], n33 = te[ 10 ];

		return n11 * ( n22 * n33 - n23 * n32 ) -
			n12 * ( n21 * n33 - n23 * n31 ) +
			n13 * ( n21 * n32 - n22 * n31 );

	}

	/**
	 * Transposes this matrix in place.
	 *
	 * @return {Matrix4} A reference to this matrix.
	 */
	transpose() {

		const te = this.elements;
		let tmp;

		tmp = te[ 1 ]; te[ 1 ] = te[ 4 ]; te[ 4 ] = tmp;
		tmp = te[ 2 ]; te[ 2 ] = te[ 8 ]; te[ 8 ] = tmp;
		tmp = te[ 6 ]; te[ 6 ] = te[ 9 ]; te[ 9 ] = tmp;

		tmp = te[ 3 ]; te[ 3 ] = te[ 12 ]; te[ 12 ] = tmp;
		tmp = te[ 7 ]; te[ 7 ] = te[ 13 ]; te[ 13 ] = tmp;
		tmp = te[ 11 ]; te[ 11 ] = te[ 14 ]; te[ 14 ] = tmp;

		return this;

	}

	/**
	 * Sets the position component for this matrix from the given vector,
	 * without affecting the rest of the matrix.
	 *
	 * @param {number|Vector3} x - The x component of the vector or alternatively the vector object.
	 * @param {number} y - The y component of the vector.
	 * @param {number} z - The z component of the vector.
	 * @return {Matrix4} A reference to this matrix.
	 */
	setPosition( x, y, z ) {

		const te = this.elements;

		if ( x.isVector3 ) {

			te[ 12 ] = x.x;
			te[ 13 ] = x.y;
			te[ 14 ] = x.z;

		} else {

			te[ 12 ] = x;
			te[ 13 ] = y;
			te[ 14 ] = z;

		}

		return this;

	}

	/**
	 * Inverts this matrix, using the [analytic method](https://en.wikipedia.org/wiki/Invertible_matrix#Analytic_solution).
	 * You can not invert with a determinant of zero. If you attempt this, the method produces
	 * a zero matrix instead.
	 *
	 * @return {Matrix4} A reference to this matrix.
	 */
	invert() {

		// based on https://github.com/toji/gl-matrix
		const te = this.elements,

			n11 = te[ 0 ], n21 = te[ 1 ], n31 = te[ 2 ], n41 = te[ 3 ],
			n12 = te[ 4 ], n22 = te[ 5 ], n32 = te[ 6 ], n42 = te[ 7 ],
			n13 = te[ 8 ], n23 = te[ 9 ], n33 = te[ 10 ], n43 = te[ 11 ],
			n14 = te[ 12 ], n24 = te[ 13 ], n34 = te[ 14 ], n44 = te[ 15 ],

			t1 = n11 * n22 - n21 * n12,
			t2 = n11 * n32 - n31 * n12,
			t3 = n11 * n42 - n41 * n12,
			t4 = n21 * n32 - n31 * n22,
			t5 = n21 * n42 - n41 * n22,
			t6 = n31 * n42 - n41 * n32,
			t7 = n13 * n24 - n23 * n14,
			t8 = n13 * n34 - n33 * n14,
			t9 = n13 * n44 - n43 * n14,
			t10 = n23 * n34 - n33 * n24,
			t11 = n23 * n44 - n43 * n24,
			t12 = n33 * n44 - n43 * n34;

		const det = t1 * t12 - t2 * t11 + t3 * t10 + t4 * t9 - t5 * t8 + t6 * t7;

		if ( det === 0 ) return this.set( 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 );

		const detInv = 1 / det;

		te[ 0 ] = ( n22 * t12 - n32 * t11 + n42 * t10 ) * detInv;
		te[ 1 ] = ( n31 * t11 - n21 * t12 - n41 * t10 ) * detInv;
		te[ 2 ] = ( n24 * t6 - n34 * t5 + n44 * t4 ) * detInv;
		te[ 3 ] = ( n33 * t5 - n23 * t6 - n43