p class="desc">
			Add objects you would otherwise pass as 'root' to the constructor or the
			[page:AnimationMixer.clipAction clipAction] method of [page:AnimationMixer AnimationMixer] and instead pass this object as 'root'.<br /><br />

			Note that objects of this class appear as one object to the mixer, so
			cache control of the individual objects must be done on the group.
		</p>

		<h2>Limitations</h2>
		<p class="desc">
			The animated properties must be compatible among all objects in the
			group.