setColors( xAxisColor, yAxisColor, zAxisColor ) {

		const color = new Color();
		const array = this.geometry.attributes.color.array;

		color.set( xAxisColor );
		color.toArray( array, 0 );
		color.toArray( array, 3 );

		color.set( yAxisColor );
		color.toArray( array, 6 );
		color.toArray( array, 9 );

		color.set( zAxisColor );
		color.toArray( array, 12 );
		color.toArray( array, 15 );

		this.geometry.attributes.color.needsUpdate = true;

		return this;

	}
Defines the colors of the axes helper.

@param {number|Color|string} xAxisColor - The color for the x axis.
@param {number|Color|string} yAxisColor - The color for the y axis.
@param {number|Color|string} zAxisColor - The color for the z axis.
@return {AxesHelper} A reference to this axes helper.