fromArray( array, offset = 0 ) {

		const coefficients = this.coefficients;

		for ( let i = 0; i < 9; i ++ ) {

			coefficients[ i ].fromArray( array, offset + ( i * 3 ) );

		}

		return this;

	}
Sets the SH coefficients of this instance from the given array.

@param {Array<number>} array - An array holding the SH coefficients.
@param {number} [offset=0] - The array offset where to start copying.
@return {SphericalHarmonics3} A clone of this instance.