public void MultipleDragMove(WorldEditor app, int x, int y)
 {
     int i = 0;
     location = app.PickTerrain(x, y);
     Vector3 position;
     foreach (IObjectDrag disObject in dragObjects)
     {
         switch (disObject.ObjectType)
         {
             case "PointLight":
             case "Marker":
             case "Object":
                 position = location + dragOffset[i];
                 if (i == 0)
                 {
                     if (disObject.AllowAdjustHeightOffTerrain)
                     {
                         position = app.ObjectPlacementLocation(x, y) + new Vector3(0, terrainOffset[i], 0);
                     }
                     else
                     {
                         position = app.ObjectPlacementLocation(x, y);
                     }
                     disObject.Position = position;
                     break;
                 }
                 else
                 {
                     if (disObject.AllowAdjustHeightOffTerrain)
                     {
                         position = app.ObjectPlacementLocation(location + dragOffset[i]) + new Vector3(0, terrainOffset[i], 0);
                     }
                     else
                     {
                         position = app.ObjectPlacementLocation(location + dragOffset[i]);
                     }
                     disObject.Position = position;
                     break;
                 }
             default:
                 position = location + dragOffset[i];
                 position.y = app.GetTerrainHeight(location.x, location.z);
                 disObject.Position = position;
                 if (String.Equals(disObject.ObjectType, "Points") && (disObject as PointCollection).DisplayMarkers != true)
                 {
                     (disObject as PointCollection).DisplayMarkers = true;
                 }
                 break;
         }
         if (!disObject.InScene)
         {
             (disObject as IWorldObject).AddToScene();
         }
         i++;
     }
 }
 public void DragMoveAllowObject(WorldEditor app, int x, int y)
 {
     if (dragging)
     {
         location = app.ObjectPlacementLocation(x, y);
         location.y = location.y + dragObject.TerrainOffset;
         dragObject.Position = location;
     }
 }