three.js/src/core/InstancedBufferAttribute.js

/**
 * @author benaadams / https://twitter.com/ben_a_adams
 */

THREE.InstancedBufferAttribute = function (array, itemSize, meshPerAttribute, dynamic) {

	THREE.DynamicBufferAttribute.call( this, array, itemSize );

	this.dynamic = dynamic || false;
	this.meshPerAttribute = meshPerAttribute || 1;

};

THREE.InstancedBufferAttribute.prototype = Object.create( THREE.DynamicBufferAttribute.prototype );
THREE.InstancedBufferAttribute.prototype.constructor = THREE.InstancedBufferAttribute;

THREE.InstancedBufferAttribute.prototype.clone = function () {

	return new THREE.InstancedBufferAttribute( new this.array.constructor( this.array ), this.itemSize, this.meshPerAttribute, this.dynamic );

};