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# Patch for VTK-7.x derived by diff from upstream:
# https://raw.githubusercontent.com/opencv/opencv/master/cmake/OpenCVDetectVTK.cmake
#
--- cmake/OpenCVDetectVTK.cmake.orig	2015-12-19 01:02:16.000000000 +1000
+++ cmake/OpenCVDetectVTK.cmake	2016-11-19 15:46:10.468197286 +1000
@@ -3,7 +3,14 @@
 endif()
 
 # VTK 6.x components
-find_package(VTK QUIET COMPONENTS vtkRenderingOpenGL vtkInteractionStyle vtkRenderingLOD vtkIOPLY vtkFiltersTexture vtkRenderingFreeType vtkIOExport NO_MODULE)
+find_package(VTK QUIET COMPONENTS vtkInteractionStyle vtkRenderingLOD vtkIOPLY vtkFiltersTexture vtkRenderingFreeType vtkIOExport NO_MODULE)
+IF(VTK_FOUND)
+  IF(VTK_RENDERING_BACKEND) #in vtk 7, the rendering backend is exported as a var.
+      find_package(VTK QUIET COMPONENTS vtkRendering${VTK_RENDERING_BACKEND} vtkInteractionStyle vtkRenderingLOD vtkIOPLY vtkFiltersTexture vtkRenderingFreeType vtkIOExport vtkIOGeometry NO_MODULE)
+  ELSE(VTK_RENDERING_BACKEND)
+      find_package(VTK QUIET COMPONENTS vtkRenderingOpenGL vtkInteractionStyle vtkRenderingLOD vtkIOPLY vtkFiltersTexture vtkRenderingFreeType vtkIOExport NO_MODULE)
+  ENDIF(VTK_RENDERING_BACKEND)
+ENDIF(VTK_FOUND)
 
 # VTK 5.x components
 if(NOT VTK_FOUND)