Mark freight animations' shapes

Author: Sharpe49

Source/RunActivity/Viewer3D/RollingStock/MSTSWagonViewer.cs

@@ -1398,10 +1398,9 @@ private void LoadTrackSound(string filename)
         internal override void Mark()
         {
             TrainCarShape.Mark();
-            if (FreightShape != null)
-                FreightShape.Mark();
-            if (InteriorShape != null)
-                InteriorShape.Mark();
+            FreightShape?.Mark();
+            InteriorShape?.Mark();
+            FreightAnimations?.Mark();
         }
     }
 }

Source/RunActivity/Viewer3D/RollingStock/SubSystems/FreightAnimationsViewer.cs

@@ -35,6 +35,14 @@ public FreightAnimationsViewer(Viewer viewer, MSTSWagon wagon, string wagonFolde
                     Animations.Add(new FreightAnimationViewer(viewer, wagon, wagonFolderSlash, animation));
             }
         }
+
+        public void Mark()
+        {
+            foreach (var animation in Animations)
+            {
+                animation.Mark();
+            }
+        }
     }
 
     public class FreightAnimationViewer
@@ -52,14 +60,14 @@ public FreightAnimationViewer(Viewer viewer, MSTSWagon wagon, string wagonFolder
                 {
                     if ( lodControl.DistanceLevels.Length > 0)
                     {
-                        foreach ( var distanceLevel in lodControl.DistanceLevels)
+                        foreach (var distanceLevel in lodControl.DistanceLevels)
                         {
                             if (distanceLevel.SubObjects.Length > 0
                                 && distanceLevel.SubObjects[0].ShapePrimitives.Length > 0
                                 && distanceLevel.SubObjects[0].ShapePrimitives[0].Hierarchy.Length > 0)
-                    {
-                        distanceLevel.SubObjects[0].ShapePrimitives[0].Hierarchy[0] = distanceLevel.SubObjects[0].ShapePrimitives[0].Hierarchy.Length;
-                    }
+                            {
+                                distanceLevel.SubObjects[0].ShapePrimitives[0].Hierarchy[0] = distanceLevel.SubObjects[0].ShapePrimitives[0].Hierarchy.Length;
+                            }
                         }
                     }
                 }
@@ -72,5 +80,10 @@ public FreightAnimationViewer(Viewer viewer, MSTSWagon wagon, string wagonFolder
                 FreightShape.XNAMatrices[0] *= flipper;
             }
         }
+
+        public void Mark()
+        {
+            FreightShape.Mark();
+        }
     }
 }