setY( index, y ) {

		if ( this.normalized ) y = normalize( y, this.array );

		this.array[ index * this.itemSize + 1 ] = y;

		return this;

	}
Sets the y component of the vector at the given index.

@param {number} index - The index into the buffer attribute.
@param {number} y - The value to set.
@return {BufferAttribute} A reference to this instance.