Don't draw texture when looking up from bed

Enable and disable move buttons

MatterControlLib/PartPreviewWindow/MainViewWidget.cs

@@ -784,6 +784,7 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 				Margin = new BorderDouble(3, 0),
 				HoverColor = theme.AccentMimimalOverlay,
 				VAnchor = VAnchor.Center,
+				Enabled = tabs.GetTabIndex(printerTab) > tabs.FirstMovableTab,
 			};
 			moveLeftButton.Click += (s, e) =>
 			{
@@ -799,6 +800,7 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 				Margin = new BorderDouble(3, 0),
 				HoverColor = theme.AccentMimimalOverlay,
 				VAnchor = VAnchor.Center,
+				Enabled = printerTab.NextTab != null,
 			};
 
 			moveRightButton.Click += (s, e) =>

MatterControlLib/PartPreviewWindow/SceneViewer/FloorDrawable.cs

@@ -99,10 +99,11 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 
 					GLHelper.Render(
 						sceneContext.Mesh,
-						theme.UnderBedColor,
+						theme.UnderBedColor.WithAlpha(0),
 						RenderTypes.Shaded,
 						world.ModelviewMatrix,
-						blendTexture: !this.LookingDownOnBed);
+						blendTexture: !this.LookingDownOnBed,
+						forceCullBackFaces: true);
 
 					if (sceneContext.PrinterShape != null)
 					{

Submodules/agg-sharp

@@ -1 +1 @@
-Subproject commit be0aedaf800379d1409c5758ddb282fc63b0f98e
+Subproject commit c0d203ee77bf0eddc6bd570132a4d2237c44309b