Follow-up of 6c36577e8e -> World Z axis set to vertical when disconnecting 3d mouse

src/slic3r/GUI/Camera.hpp

@@ -122,6 +122,13 @@ public:
     // returns true if the camera z axis (forward) is pointing in the negative direction of the world z axis
     bool is_looking_downward() const { return get_dir_forward().dot(Vec3d::UnitZ()) < 0.0; }
 
+    // forces camera right vector to be parallel to XY plane
+    void recover_from_free_camera()
+    {
+        if (std::abs(get_dir_right()(2)) > EPSILON)
+            look_at(get_position(), m_target, Vec3d::UnitZ());
+    }
+
     void look_at(const Vec3d& position, const Vec3d& target, const Vec3d& up);
 
     double max_zoom() const { return 100.0; }

src/slic3r/GUI/Mouse3DController.cpp

@@ -388,6 +388,9 @@ void Mouse3DController::disconnected()
         m_params_by_device[m_device_str] = m_params_ui;
 	    m_device_str.clear();
 	    m_connected = false;
+        wxGetApp().plater()->get_camera().recover_from_free_camera();
+        wxGetApp().plater()->set_current_canvas_as_dirty();
+        wxWakeUpIdle();
     }
 }
 
@@ -773,7 +776,10 @@ void Mouse3DController::disconnect_device()
 	    }
 	    m_device_str.clear();
 	    m_connected = false;
-	}
+        wxGetApp().plater()->get_camera().recover_from_free_camera();
+        wxGetApp().plater()->set_current_canvas_as_dirty();
+        wxWakeUpIdle();
+    }
 }
 
 void Mouse3DController::collect_input()

src/slic3r/GUI/Plater.cpp

@@ -2277,11 +2277,7 @@ void Plater::priv::update_ui_from_settings()
 
     camera.set_type(wxGetApp().app_config->get("use_perspective_camera"));
     if (wxGetApp().app_config->get("use_free_camera") != "1")
-    {
+        camera.recover_from_free_camera();
-        // forces camera right vector to be parallel to XY plane
-        if (std::abs(camera.get_dir_right()(2)) > EPSILON)
-            camera.look_at(camera.get_position(), camera.get_target(), Vec3d::UnitZ());
-    }
 
     view3D->get_canvas3d()->update_ui_from_settings();
     preview->get_canvas3d()->update_ui_from_settings();
@@ -5661,6 +5657,11 @@ const Camera& Plater::get_camera() const
     return p->camera;
 }
 
+Camera& Plater::get_camera()
+{
+    return p->camera;
+}
+
 const Mouse3DController& Plater::get_mouse3d_controller() const
 {
     return p->mouse3d_controller;

src/slic3r/GUI/Plater.hpp

@@ -280,6 +280,7 @@ public:
     bool init_view_toolbar();
 
     const Camera& get_camera() const;
+    Camera& get_camera();
     const Mouse3DController& get_mouse3d_controller() const;
     Mouse3DController& get_mouse3d_controller();