add some extra assets FX and SFX

Assets/Game Kit Controller/Scripts/PickUps/explosiveBarrel.cs

@@ -132,6 +132,7 @@ public class explosiveBarrel : MonoBehaviour
 
     int colorID;
 
+
     private void InitializeAudioElements ()
     {
         if (explosionSound != null) {
@@ -174,12 +175,14 @@ public class explosiveBarrel : MonoBehaviour
                         currentMaterial = rendererParts [i];
 
                         if (currentMaterial.HasProperty (colorID)) {
-                            Color alpha = currentMaterial.color;
+                            Color alpha = currentMaterial.GetColor (colorID);
+
                             alpha.a -= Time.deltaTime / 5;
-                            currentMaterial.color = alpha;
+
+                            currentMaterial.SetColor (colorID, alpha);
 
                             //once the alpha is 0, remove the gameObject
-                            if (currentMaterial.color.a > 0) {
+                            if (alpha.a > 0) {
                                 allPiecesFaded = false;
                             }
                         }