Make sure we still center things when adding to bed

MatterControlLib/ApplicationView/PrinterModels.cs

@@ -182,24 +182,13 @@ namespace MatterHackers.MatterControl
 						itemsToAdd,
 						context.View3DWidget,
 						scene,
+						(Printer != null) ? Printer.Bed.BedCenter : Vector2.Zero,
 						(item, itemsToAvoid) =>
 						{
 							PlatingHelper.MoveToOpenPositionRelativeGroup(item, itemsToAvoid);
 						}));
 			});
 
-			// Get the bounds of the loaded InsertionGroup with all of its content
-			//var aabb = injector.GetAxisAlignedBoundingBox(Matrix4X4.Identity);
-
-			// Remove position
-			//injector.Matrix *= Matrix4X4.CreateTranslation(new Vector3(-aabb.minXYZ.X, -aabb.minXYZ.Y, -aabb.minXYZ.Z));
-
-			// Recenter
-			//injector.Matrix *= Matrix4X4.CreateTranslation(new Vector3(bedCenter.X - aabb.XSize / 2, (double)(bedCenter.Y - aabb.YSize / 2), 0));
-
-			// Move again after content loaded
-			//PlatingHelper.MoveToOpenPosition(injector, scene.Children.ToList());
-
 			return insertionGroup;
 		}
 

MatterControlLib/Library/Widgets/InsertionGroupObject3D.cs

@@ -62,6 +62,7 @@ namespace MatterHackers.MatterControl.Library
 		public InsertionGroupObject3D(IEnumerable<ILibraryItem> items, 
 			View3DWidget view3DWidget, 
 			InteractiveScene scene, 
+			Vector2 newItemOffset,
 			Action<IObject3D, IEnumerable<IObject3D>> layoutParts,
 			bool trackSourceFiles = false)
 		{
@@ -78,7 +79,6 @@ namespace MatterHackers.MatterControl.Library
 
 			this.LoadingItemsTask = Task.Run((Func<Task>)(async () =>
 			{
-				var newItemOffset = Vector2.Zero;
 				var offset = Matrix4X4.Identity;
 
 				// Add the placeholder 'Loading...' object

MatterControlLib/PartPreviewWindow/View3D/View3DWidget.cs

@@ -550,6 +550,7 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 				items,
 				this,
 				Scene,
+				sceneContext.BedCenter,
 				null,
 				trackSourceFiles);