Adding a basic test to test vtkMPIMultiBlockPLOT3DReader.

Also fixed vtkTestingMacros to properly locate vtkpython executable when
adding MPI tests.

CMake/vtkTestingMacros.cmake

@@ -460,6 +460,7 @@ function(vtk_add_test_python_mpi)
     ${VTK_MPI_PRENUMPROC_FLAGS} ${VTK_MPI_NUMPROC_FLAG} ${numprocs}
     ${VTK_MPI_PREFLAGS})
 
+  set (VTK_PYTHON_EXE "\\$<TARGET_FILE:pvtkpython>")
   vtk_add_test_python(${ARGN})
 endfunction()
 

IO/MPIParallel/Testing/Python/CMakeLists.txt

+vtk_add_test_python_mpi(
+  Plot3DMPIIO.py,NO_VALID
+)

IO/MPIParallel/Testing/Python/Plot3DMPIIO.py

+#!/usr/bin/env python
+import sys
+import vtk
+from vtk.test import Testing
+from vtk.util.misc import vtkGetDataRoot
+VTK_DATA_ROOT = vtkGetDataRoot()
+
+def Gather(c, arr, root):
+    vtkArr = vtk.vtkDoubleArray()
+    count = len(arr)
+    vtkArr.SetNumberOfTuples(count)
+    for i in range(count):
+        vtkArr.SetValue(i, arr[i])
+    vtkResult = vtk.vtkDoubleArray()
+    c.Gather(vtkArr, vtkResult, root)
+    result = [vtkResult.GetValue(i) for i in range(vtkResult.GetNumberOfTuples())]
+    return [ tuple(result[i : i + count]) \
+                for i in xrange(0, vtkResult.GetNumberOfTuples(), count) ]
+
+renWin = vtk.vtkRenderWindow()
+
+iren = vtk.vtkRenderWindowInteractor()
+iren.SetRenderWindow(renWin)
+
+r = vtk.vtkMultiBlockPLOT3DReader()
+# Since vtkMPIMultiBlockPLOT3DReader is not created on Windows even when MPI
+# is enabled.
+assert r.IsA("vtkMPIMultiBlockPLOT3DReader") == 1 or sys.platform == "win32"
+
+r.SetFileName(VTK_DATA_ROOT + "/Data/multi-bin.xyz")
+r.SetQFileName(VTK_DATA_ROOT + "/Data/multi-bin-oflow.q")
+r.SetFunctionFileName(VTK_DATA_ROOT + "/Data/multi-bin.f")
+r.AutoDetectFormatOn()
+
+r.Update()
+
+c = vtk.vtkMPIController.GetGlobalController()
+size = c.GetNumberOfProcesses()
+rank = c.GetLocalProcessId()
+block = 0
+
+bounds = r.GetOutput().GetBlock(block).GetBounds()
+bounds = Gather(c, bounds, root=0)
+
+if rank == 0:
+    print "Reader:", r.GetClassName()
+    print "Bounds:"
+    for i in range(size):
+        print bounds[i]
+
+c.Barrier()
+aname = "StagnationEnergy"
+rng = r.GetOutput().GetBlock(block).GetPointData().GetArray(aname).GetRange(0)
+
+rng = Gather(c, rng, root=0)
+if rank == 0:
+    print "StagnationEnergy Ranges:"
+    for i in range(size):
+        print rng[i]
+        assert rng[i][0] > 1.1 and rng[i][0] < 24.1 and \
+               rng[i][1] > 1.1 and rng[i][1] < 24.1

IO/MPIParallel/module.cmake

 vtk_module(vtkIOMPIParallel
   IMPLEMENTS
     vtkIOGeometry
+    vtkIOParallel
   GROUPS
     MPI
   DEPENDS