three.js/examples/js/misc/MorphAnimMesh.js

( function () {

	var MorphAnimMesh = function ( geometry, material ) {

		THREE.Mesh.call( this, geometry, material );
		this.type = 'MorphAnimMesh';
		this.mixer = new THREE.AnimationMixer( this );
		this.activeAction = null;

	};

	MorphAnimMesh.prototype = Object.create( THREE.Mesh.prototype );
	MorphAnimMesh.prototype.constructor = MorphAnimMesh;

	MorphAnimMesh.prototype.setDirectionForward = function () {

		this.mixer.timeScale = 1.0;

	};

	MorphAnimMesh.prototype.setDirectionBackward = function () {

		this.mixer.timeScale = - 1.0;

	};

	MorphAnimMesh.prototype.playAnimation = function ( label, fps ) {

		if ( this.activeAction ) {

			this.activeAction.stop();
			this.activeAction = null;

		}

		var clip = THREE.AnimationClip.findByName( this, label );

		if ( clip ) {

			var action = this.mixer.clipAction( clip );
			action.timeScale = clip.tracks.length * fps / clip.duration;
			this.activeAction = action.play();

		} else {

			throw new Error( 'THREE.MorphAnimMesh: animations[' + label + '] undefined in .playAnimation()' );

		}

	};

	MorphAnimMesh.prototype.updateAnimation = function ( delta ) {

		this.mixer.update( delta );

	};

	MorphAnimMesh.prototype.copy = function ( source ) {

		THREE.Mesh.prototype.copy.call( this, source );
		this.mixer = new THREE.AnimationMixer( this );
		return this;

	};

	THREE.MorphAnimMesh = MorphAnimMesh;

} )();