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The bug is appearing when trying to display meshes in project external to iMSTK (everything was working well inside iMSTK: the sandbox for example)

This issue was mainly due to the usage of vtkCustomePolyDataMapper

It can be fixed thanks to the modification (done by @alexis-girault) contained in the attached diff file (CustomPolyDataMapperFix.patch)

The main issue is fixed by this modification in imstkVTKRenderDelegate.h:

     VTKRenderDelegate()
     {
         m_actor = vtkSmartPointer<vtkActor>::New();
-        m_mapper = vtkSmartPointer<VTKCustomPolyDataMapper>::New();
+        m_mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
         m_transform = vtkSmartPointer<vtkTransform>::New();
         m_actor->SetMapper(m_mapper);
         m_actor->SetUserTransform(m_transform);
     }
 
     vtkSmartPointer<vtkActor> m_actor;
-    vtkSmartPointer<VTKCustomPolyDataMapper> m_mapper;
+    vtkSmartPointer<vtkPolyDataMapper> m_mapper;
     vtkSmartPointer<vtkTransform> m_transform;
 };
 }

For example, here is what could be observed with and without the bug (the lower mandibule displayed in both cases is a thetraedric mesh, which isn't affected by the bug):