Enhanced hollowing scheme, closing distance working as expected.

src/slic3r/GUI/Gizmos/GLGizmoHollow.hpp

@@ -109,18 +109,15 @@ private:
     std::vector<sla::SupportPoint> m_normal_cache; // to restore after discarding changes or undo/redo
 
     float m_offset = 2.0f;
-
+    float m_accuracy = 0.5f;
+    float m_closing_d = 2.f;
+    
     float m_clipping_plane_distance = 0.f;
     std::unique_ptr<ClippingPlane> m_clipping_plane;
     
-    float m_accuracy = 0.5f;
-
     // This map holds all translated description texts, so they can be easily referenced during layout calculations
     // etc. When language changes, GUI is recreated and this class constructed again, so the change takes effect.
     std::map<std::string, wxString> m_desc;
-    
-    
-    float m_smoothness = 0.5f;
 
     GLSelectionRectangle m_selection_rectangle;