Method setFromMatrix4

src/math/Matrix3.js:173–187

* Set this matrix to the upper 3x3 matrix of the given 4x4 matrix. * * @param {Matrix4} m - The 4x4 matrix. * @return {Matrix3} A reference to this matrix.

( m )

	 * @return {Matrix3} A reference to this matrix.
	 */
	setFromMatrix4( m ) {

		const me = m.elements;

		this.set(

			me[ 0 ], me[ 4 ], me[ 8 ],
			me[ 1 ], me[ 5 ], me[ 9 ],
			me[ 2 ], me[ 6 ], me[ 10 ]

		);

		return this;

	}

	/**
	 * Post-multiplies this matrix by the given 3x3 matrix.