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Using vtk 8.2.0, in combination with the (new) OpenGL2 backend vtkOpenGLPolyDataMapper2D does not apply the clipping planes anymore which can be set using the function SetClippingPlanes.

=> see screenshot vtk8.2.0_OpenGL2_backend.png

!

=> the circle is not clipped as expected

e.g. when using vtk 7.1.1, in combination with the (old) OpenGL backend vtkOpenGLPolyDataMapper2D did apply the clipping planes:

=> see screenshot vtk7.1.1_OpenGL_backend.png

!

=> the circle is clipped (as expected)

vtkOpenGLPolyDataMapper2D_SetClippingPlanes.zip

Please note: The "3D version" vtkOpenGLPolyDataMappper does take the clipping planes into account (OpenGL2 backend).

Of course the vtkPolyData could be clipped up front using vtkClipPolyData. However vtkOpenGLPolyDataMapper2D should be able to clip the data as well, just like it did in the OpenGL backend.