From a053454cab4e66e63add63840ee56d36eb1944ec Mon Sep 17 00:00:00 2001
From: Shawn Waldon <shawn.waldon@kitware.com>
Date: Thu, 27 Apr 2017 16:07:28 -0400
Subject: [PATCH] Add an example of the MultiBlockDataGroupFilter

This is the "Group Datasets" filter in ParaView and is useful for
creating multiblock datasets.
---
 Cxx/CompositeData/CMakeLists.txt              |  2 +
 .../MultiBlockDataGroupFilter.cxx             | 45 +++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 Cxx/CompositeData/MultiBlockDataGroupFilter.cxx

diff --git a/Cxx/CompositeData/CMakeLists.txt b/Cxx/CompositeData/CMakeLists.txt
index 5340171..707ae05 100644
--- a/Cxx/CompositeData/CMakeLists.txt
+++ b/Cxx/CompositeData/CMakeLists.txt
@@ -36,6 +36,8 @@ ADD_TEST(${KIT}-CompositePolyDataMapper ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${KIT}
   TestCompositePolyDataMapper)
 ADD_TEST(${KIT}-MultiBlockDataSet ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${KIT}CxxTests
   TestMultiBlockDataSet)
+ADD_TEST(${KIT}-MultiBlockDataGroupFilter ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${KIT}CxxTests
+  TestMultiBlockDataGroupFilter)
 
 INCLUDE(${WikiExamples_SOURCE_DIR}/CMake/ExamplesTesting.cmake)
 
diff --git a/Cxx/CompositeData/MultiBlockDataGroupFilter.cxx b/Cxx/CompositeData/MultiBlockDataGroupFilter.cxx
new file mode 100644
index 0000000..f4164c7
--- /dev/null
+++ b/Cxx/CompositeData/MultiBlockDataGroupFilter.cxx
@@ -0,0 +1,45 @@
+#include <vtkMultiBlockDataSet.h>
+#include <vtkSphereSource.h>
+#include <vtkNew.h>
+#include <vtkCompositePolyDataMapper2.h>
+#include <vtkMultiBlockDataGroupFilter.h>
+#include <vtkActor.h>
+#include <vtkRenderer.h>
+#include <vtkRenderWindow.h>
+#include <vtkRenderWindowInteractor.h>
+
+int main( int argc, char *argv[] )
+{
+  vtkNew<vtkMultiBlockDataGroupFilter> groupFilter;
+  // The vtkMultiBlockDataGroupFilter allows multiple inputs and adds
+  // each input as a block in its output multiblock dataset.
+  for (int i = 0; i < 5; ++i)
+  {
+    for (int j = 0; j < 5; ++j)
+    {
+      vtkNew<vtkSphereSource> sphere;
+      sphere->SetCenter(2 * i, 2 * j,0);
+      sphere->SetRadius((50 - (i * i) - (j * j)) / 52.4);
+      groupFilter->AddInputConnection(sphere->GetOutputPort());
+    }
+  }
+
+  vtkNew<vtkCompositePolyDataMapper2> mapper;
+  mapper->SetInputConnection(groupFilter->GetOutputPort());
+  
+  vtkNew<vtkActor> actor;
+  actor->SetMapper(mapper.Get());
+
+  vtkNew<vtkRenderer> renderer;
+  vtkNew<vtkRenderWindow> renderWindow;
+  renderWindow->AddRenderer(renderer.Get());
+  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
+  renderWindowInteractor->SetRenderWindow(renderWindow.Get());
+
+  renderer->AddActor(actor.Get());
+
+  renderWindow->Render();
+  renderWindowInteractor->Start();
+
+  return EXIT_SUCCESS;
+}