AnimationClip: Let morph parsers take 'noLoop'.

- See #8446

src/animation/AnimationClip.js

@@ -119,7 +119,7 @@ Object.assign( THREE.AnimationClip, {
 	},
 
 
-	CreateFromMorphTargetSequence: function( name, morphTargetSequence, fps ) {
+	CreateFromMorphTargetSequence: function( name, morphTargetSequence, fps, noLoop ) {
 
 		var numMorphTargets = morphTargetSequence.length;
 		var tracks = [];
@@ -142,7 +142,7 @@ Object.assign( THREE.AnimationClip, {
 
 			// if there is a key at the first frame, duplicate it as the
 			// last frame as well for perfect loop.
-			if ( times[ 0 ] === 0 ) {
+			if ( ! noLoop && times[ 0 ] === 0 ) {
 
 				times.push( numMorphTargets );
 				values.push( values[ 0 ] );
@@ -175,7 +175,7 @@ Object.assign( THREE.AnimationClip, {
 
 	},
 
-	CreateClipsFromMorphTargetSequences: function( morphTargets, fps ) {
+	CreateClipsFromMorphTargetSequences: function( morphTargets, fps, noLoop ) {
 
 		var animationToMorphTargets = {};
 
@@ -211,7 +211,7 @@ Object.assign( THREE.AnimationClip, {
 
 		for ( var name in animationToMorphTargets ) {
 
-			clips.push( THREE.AnimationClip.CreateFromMorphTargetSequence( name, animationToMorphTargets[ name ], fps ) );
+			clips.push( THREE.AnimationClip.CreateFromMorphTargetSequence( name, animationToMorphTargets[ name ], fps, noLoop ) );
 
 		}