Fix AudioNode issues when using velocityFromTranslation and small refactoring (#875)

* Fix AudioNode issues when using velocityFromTranslation and small refactoring

* Fix audionode fix

jme3-core/src/main/java/com/jme3/audio/AudioNode.java

@@ -722,25 +722,14 @@ public class AudioNode extends Node implements AudioSource {
     @Override
     public void updateGeometricState() {
         super.updateGeometricState();
-
-        if (channel < 0) {
-            return;
-        }
-
+        if (channel < 0 || this.getParent() == null) return;
         Vector3f currentWorldTranslation = worldTransform.getTranslation();
-
-        if (Float.isNaN(previousWorldTranslation.x)
-                || !previousWorldTranslation.equals(currentWorldTranslation)) {
-
+        if (!previousWorldTranslation.equals(currentWorldTranslation)) {
             getRenderer().updateSourceParam(this, AudioParam.Position);
-
-            if (velocityFromTranslation) {
-                velocity.set(currentWorldTranslation).subtractLocal(previousWorldTranslation);
-                velocity.multLocal(1f / lastTpf);
-
+            if (velocityFromTranslation && !Float.isNaN(previousWorldTranslation.x)) {
+                velocity.set(currentWorldTranslation).subtractLocal(previousWorldTranslation).multLocal(1f / lastTpf);
                 getRenderer().updateSourceParam(this, AudioParam.Velocity);
             }
-
             previousWorldTranslation.set(currentWorldTranslation);
         }
     }
@@ -748,10 +737,6 @@ public class AudioNode extends Node implements AudioSource {
     @Override
     public AudioNode clone(){
         AudioNode clone = (AudioNode) super.clone();
-
-        clone.direction = direction.clone();
-        clone.velocity  = velocity.clone();
-
         return clone;
     }
 
@@ -763,7 +748,8 @@ public class AudioNode extends Node implements AudioSource {
         super.cloneFields(cloner, original); 
 
         this.direction=cloner.clone(direction);
-        this.velocity = cloner.clone(velocity);
+        this.velocity=velocityFromTranslation?new Vector3f():cloner.clone(velocity);      
+        this.previousWorldTranslation=Vector3f.NAN.clone();
 
         // Change in behavior: the filters were not cloned before meaning
         // that two cloned audio nodes would share the same filter instance.