<!-- NEW6 — TEST 6 · THE FIVE SHORES · part 280 -->
sually done in the render loop by passing the delta
	 * time from {@link Clock} or {@link Timer}.
	 *
	 * @param {number} deltaTime - The delta time in seconds.
	 * @return {AnimationMixer} A reference to this animation mixer.
	 */
	update( deltaTime ) {

		deltaTime *= this.timeScale;

		const actions = this._actions,
			nActions = this._nActiveActions,

			time = this.time += deltaTime,
			timeDirection = Math.sign( deltaTime ),

			accuIndex = this._accuIndex ^= 1;

		// run active actions

		for ( let i = 0; i !== nActions; ++ i ) {

			const action = actions[ i ];

			action._update( time, deltaTime, timeDirection, accuIndex );

		}

		// update scene graph

		const bindings = this._bindings,
			nBindings = this._nActiveBindings;

		for ( let i = 0; i !== nBindings; ++ i ) {

			bindings[ i ].apply( accuIndex );

		}

		return this;

	}

	/**
	 * Sets the global mixer to a specific time and updates the animation accordingly.
	 *
	 * This is useful when you need to jump to an exact time in an animation. The
	 * input parameter will be scaled by {@link AnimationMixer#timeScale}
	 *
	 * @param {number} time - The time to set in seconds.
	 * @return {AnimationMixer} A reference to this animation mixer.
	 */
	setTime( time ) {

		this.time = 0; // Zero out time attribute for AnimationMixer object;
		for ( let i = 0; i < this._actions.length; i ++ ) {

			this._actions[ i ].time = 0; // Zero out time attribute for all associated AnimationAction objects.

		}

		return this.update( time ); // Update used to set exact time. Returns "this" AnimationMixer object.

	}

	/**
	 * Returns this mixer's root object.
	 *
	 * @return {Object3D} The mixer's root object.
	 */
	getRoot() {

		return this._root;

	}

	/**
	 * Deallocates all memory resources for a clip. Before using this method make
	 * sure to call {@link AnimationAction#stop} for all related actions.
	 *
	 * @param {AnimationClip} clip - The clip to uncache.
	 */
	uncacheClip( clip ) {

		const actions = this._actions,
			clipUuid = clip.uuid,
			actionsByClip = this._actionsByClip,
			actionsForClip = actionsByClip[ clipUuid ];

		if ( actionsForClip !== undefined ) {

			// note: just calling _removeInactiveAction would mess up the
			// iteration state and also require updating the state we can
			// just throw away

			const actionsToRemove = actionsForClip.knownActions;

			for ( let i = 0, n = actionsToRemove.length; i !== n; ++ i ) {

				const action = actionsToRemove[ i ];

				this._deactivateAction( action );

				const cacheIndex = action._cacheIndex,
					lastInactiveAction = actions[ actions.length - 1 ];

				action._cacheIndex = null;
				action._byClipCacheIndex = null;

				lastInactiveAction._cacheIndex = cacheIndex;
				actions[ cacheIndex ] = lastInactiveAction;
				actions.pop();

				this._removeInactiveBindingsForAction( action );

			}

			delete actionsByClip[ clipUuid ];

		}

	}

	/**
	 * Deallocates all memory resources for a root object. Before using this
	 * method make sure to call {@link AnimationAction#stop} for all related
	 * actions or alternatively {@link AnimationMixer#stopAllAction} when the
	 * mixer operates on a single root.
	 *
	 * @param {Object3D} root - The root object to uncache.
	 */
	uncacheRoot( root ) {

		const rootUuid = root.uuid,
			actionsByClip = this._actionsByClip;

		for ( const clipUuid in actionsByClip ) {

			const actionByRoot = actionsByClip[ clipUuid ].actionByRoot,
				action = actionByRoot[ rootUuid ];

			if ( action !== undefined ) {

				this._deactivateAction( action );
				this._removeInactiveAction( action );

			}

		}

		const bindingsByRoot = this._bindingsByRootAndName,
			bindingByName = bindingsByRoot[ rootUuid ];

		if ( bindingByName !== undefined ) {

			for ( const trackName in bindingByName ) {

				const binding = bindingByName[ trackName ];
				binding.restoreOriginalState();
				this._removeInactiveBinding( binding );

			}

		}

	}

	/**
	 * Deallocates all memory resources for an action. The action is identified by the
	 * given clip and an optional root object. Before using this method make
	 * sure to call {@link AnimationAction#stop} to deactivate the action.
	 *
	 * @param {AnimationClip|string} clip - An animation clip or alternatively the name of the animation clip.
	 * @param {Object3D} [optionalRoot] - An alternative root object.
	 */
	uncacheAction( clip, optionalRoot ) {

		const action = this.existingAction( clip, optionalRoot );

		if ( action !== null ) {

			this._deactivateAction( action );
			this._removeInactiveAction( action );

		}

	}

}

/**
 * Represents a 3D render target.
 *
 * @augments RenderTarget
 */
class RenderTarget3D extends RenderTarget {

	/**
	 * Constructs a new 3D render target.
	 *
	 * @param {number} [width=1] - The width of the render target.
	 * @param {number} [height=1] - The height of the render target.
	 * @param {number} [depth=1] - The height of the render target.