clone( data ) {

		if ( data === undefined ) {

			console.log( 'THREE.InterleavedBufferAttribute.clone(): Cloning an interleaved buffer attribute will de-interleave buffer data.' );

			const array = [];

			for ( let i = 0; i < this.count; i ++ ) {

				const index = i * this.data.stride + this.offset;

				for ( let j = 0; j < this.itemSize; j ++ ) {

					array.push( this.data.array[ index + j ] );

				}

			}

			return new BufferAttribute( new this.array.constructor( array ), this.itemSize, this.normalized );

		} else {

			if ( data.interleavedBuffers === undefined ) {

				data.interleavedBuffers = {};

			}

			if ( data.interleavedBuffers[ this.data.uuid ] === undefined ) {

				data.interleavedBuffers[ this.data.uuid ] = this.data.clone( data );

			}

			return new InterleavedBufferAttribute( data.interleavedBuffers[ this.data.uuid ], this.itemSize, this.offset, this.normalized );

		}

	}
Returns a new buffer attribute with copied values from this instance.

If no parameter is provided, cloning an interleaved buffer attribute will de-interleave buffer data.

@param {Object} [data] - An object with interleaved buffers that allows to retain the interleaved property.
@return {BufferAttribute|InterleavedBufferAttribute} A clone of this instance.