deleteInstance( instanceId ) {

		this.validateInstanceId( instanceId );

		this._instanceInfo[ instanceId ].active = false;
		this._availableInstanceIds.push( instanceId );
		this._visibilityChanged = true;

		return this;

	}
Deletes an existing instance from the batch using the given ID.

@param {number} instanceId - The ID of the instance to remove from the batch.
@return {BatchedMesh} A reference to this batched mesh.