constructor( degree1, degree2, degree3, knots1, knots2, knots3 /* arrays of reals */, controlPoints /* array^3 of Vector(2|3|4) */ ) {

		this.degree1 = degree1;
		this.degree2 = degree2;
		this.degree3 = degree3;
		this.knots1 = knots1;
		this.knots2 = knots2;
		this.knots3 = knots3;
		this.controlPoints = [];

		const len1 = knots1.length - degree1 - 1;
		const len2 = knots2.length - degree2 - 1;
		const len3 = knots3.length - degree3 - 1;

		// ensure Vector4 for control points
		for ( let i = 0; i < len1; ++ i ) {

			this.controlPoints[ i ] = [];

			for ( let j = 0; j < len2; ++ j ) {

				this.controlPoints[ i ][ j ] = [];

				for ( let k = 0; k < len3; ++ k ) {

					const point = controlPoints[ i ][ j ][ k ];
					this.controlPoints[ i ][ j ][ k ] = new Vector4( point.x, point.y, point.z, point.w );

				}

			}

		}

	}
Constructs a new NURBS surface.

@param {number} degree1 - The first NURBS degree.
@param {number} degree2 - The second NURBS degree.
@param {number} degree3 - The third NURBS degree.
@param {Array<number>} knots1 - The first knots as a flat array of numbers.
@param {Array<number>} knots2 - The second knots as a flat array of numbers.
@param {Array<number>} knots3 - The third knots as a flat array of numbers.
@param {Array<Array<Array<Vector2|Vector3|Vector4>>>} controlPoints - An array^3 holding control points.