makeBasis( xAxis, yAxis, zAxis ) {

		this.set(
			xAxis.x, yAxis.x, zAxis.x, 0,
			xAxis.y, yAxis.y, zAxis.y, 0,
			xAxis.z, yAxis.z, zAxis.z, 0,
			0, 0, 0, 1
		);

		return this;

	}
Sets the given basis vectors to this matrix.

@param {Vector3} xAxis - The basis's x axis.
@param {Vector3} yAxis - The basis's y axis.
@param {Vector3} zAxis - The basis's z axis.
@return {Matrix4} A reference to this matrix.