build( vmd, mesh ) {

			// combine skeletal and morph animations
			const tracks = this.buildSkeletalAnimation( vmd, mesh ).tracks;
			const tracks2 = this.buildMorphAnimation( vmd, mesh ).tracks;

			for ( let i = 0, il = tracks2.length; i < il; i ++ ) {

				tracks.push( tracks2[ i ] );

			}

			return new THREE.AnimationClip( '', - 1, tracks );

		}
@param {Object} vmd - parsed VMD data
@param {SkinnedMesh} mesh - tracks will be fitting to mesh
@return {AnimationClip}