BUG:Fixed direct call to Render on the vtkRenderer which is strictly forbidden...
BUG:Fixed direct call to Render on the vtkRenderer which is strictly forbidden as the vtkRenderer. Notably, vtkRenderer relies on values initialized by the vtkRenderWindow. In the case of Example Medical3.cxx, as Renderer() was called on the vtkRenderer before any internal initialization of the vtkRenderWindow it resulted in the use of uninitialized variable. Thanks valgrind for catching this.
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