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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The calculator gives incorrect results for multiblock unless the variables have the same index internally. This can be reproduced with the steps below:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Create a python source that outputs vtkUnstructuredGrid with the following script:<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>def add_scalar(ds, val):<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'> arr = vtk.vtkDoubleArray()<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'> arr.SetName("Scalar"+str(val))<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'> arr.SetNumberOfComponents(1)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'> arr.SetNumberOfTuples(8)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'> for i in range(8):<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'> arr.SetTuple1(i, float(val))<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'> output.GetPointData().AddArray(arr)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'><o:p> </o:p></p><p class=MsoNormal style='margin-left:36.0pt'>output = self.GetOutput()<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>npts = 8<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts = vtk.vtkPoints()<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts.InsertNextPoint(-3.0, -1.0, -1.0)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts.InsertNextPoint(-1.0, -1.0, -1.0)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts.InsertNextPoint(-1.0, 1.0, -1.0)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts.InsertNextPoint(-3.0, 1.0, -1.0)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts.InsertNextPoint(-3.0, -1.0, 1.0)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts.InsertNextPoint(-1.0, -1.0, 1.0)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts.InsertNextPoint(-1.0, 1.0, 1.0)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts.InsertNextPoint(-3.0, 1.0, 1.0)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>output.SetPoints(pts)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>output.Allocate(1,1)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>ids = vtk.vtkIdList()<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>for i in range(npts):<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'> ids.InsertId(i,i)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>add_scalar(output, 1)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>add_scalar(output, 2)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>output.InsertNextCell(vtk.VTK_HEXAHEDRON, ids)<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Create a second python source that outputs vtkUnstructuredGrid with the following script (notice the change in order when adding the scalars):<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>def add_scalar(ds, val):<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'> arr = vtk.vtkDoubleArray()<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'> arr.SetName("Scalar"+str(val))<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'> arr.SetNumberOfComponents(1)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'> arr.SetNumberOfTuples(8)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'> for i in range(8):<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'> arr.SetTuple1(i, float(val))<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'> output.GetPointData().AddArray(arr)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'><o:p> </o:p></p><p class=MsoNormal style='margin-left:36.0pt'>output = self.GetOutput()<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>npts = 8<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts = vtk.vtkPoints()<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts.InsertNextPoint(-3.0, -1.0, -1.0)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts.InsertNextPoint(-1.0, -1.0, -1.0)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts.InsertNextPoint(-1.0, 1.0, -1.0)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts.InsertNextPoint(-3.0, 1.0, -1.0)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts.InsertNextPoint(-3.0, -1.0, 1.0)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts.InsertNextPoint(-1.0, -1.0, 1.0)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts.InsertNextPoint(-1.0, 1.0, 1.0)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>pts.InsertNextPoint(-3.0, 1.0, 1.0)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>output.SetPoints(pts)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>output.Allocate(1,1)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>ids = vtk.vtkIdList()<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>for i in range(npts):<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'> ids.InsertId(i,i) <o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>add_scalar(output, 2)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>add_scalar(output, 1)<o:p></o:p></p><p class=MsoNormal style='margin-left:36.0pt'>output.InsertNextCell(vtk.VTK_HEXAHEDRON, ids)<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Group the two python sources together<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Use the Calculator filter to pass through Scalar1<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>See output below:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><img width=750 height=629 id="Picture_x0020_1" src="cid:image001.png@01CCEA5B.B293B590"><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Regards,<o:p></o:p></p><p class=MsoNormal>Paul<o:p></o:p></p></div><pre>
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