Thanks Burlen -simon ________________________________ From: Burlen Loring [blor...@lbl.gov] Sent: Friday, May 16, 2014 4:23 PM To: Su, Simon M CTR USARMY ARL (US); paraview@paraview.org Subject: Re: [Paraview] Accessing a specific variable in Python Programmable Filter
============================= input = self.GetPolyDataInput(); output = self.GetPolyDataOutput(); colors = vtk.vtkUnsignedCharArray(); colors.SetNumberOfComponents(3); colors.SetName("Colors"); numPoints = input.GetNumberOfPoints() for i in range(0, numPoints): colors.InsertNextTuple3(255,0,0); output=input output.GetPointData().AddArray(colors) =============================== Not sure how this got on the wiki but this is an example of what *not* to do!! In a VTK filter one's never supposed to modify the input. output=input output.GetPointData().AddArray(colors) This is exactly what's done here. Of course you're not going to find the array in the filter's output if you're adding it to the input! This code can be fixed by removing the output=input line. With that change you should be able to see the array in downstream filters. note, in python 2 range actually generates a list with all the values in it, while xrange creates an iterator which is far more efficient. To actually use the colors you'll also have to uncheck the map scalars check box in the display properties. input = self.GetPolyDataInput(); output = self.GetPolyDataOutput(); colors = vtk.vtkUnsignedCharArray(); colors.SetNumberOfComponents(3); colors.SetName("Colors"); numPoints = input.GetNumberOfPoints() for i in xrange(0, numPoints): colors.InsertNextTuple3(0,255,0); output.GetPointData().AddArray(colors) del colors On 05/16/2014 12:46 PM, Su, Simon M CTR USARMY ARL (US) wrote: Hello, After staring at http://www.paraview.org/Wiki/Python_Programmable_Filter for a while, the way to access the data for a specific variable name still eludes me. This is the python code from the wiki on Add the Colors variable to a PolyData ============================= input = self.GetPolyDataInput(); output = self.GetPolyDataOutput(); colors = vtk.vtkUnsignedCharArray(); colors.SetNumberOfComponents(3); colors.SetName("Colors"); numPoints = input.GetNumberOfPoints() for i in range(0, numPoints): colors.InsertNextTuple3(255,0,0); output=input output.GetPointData().AddArray(colors) =============================== How do I from the next filter, access the variable name "Colors" that I created? Any help is much appreciated. thanks -simon _______________________________________________ Powered by www.kitware.com<http://www.kitware.com> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Follow this link to subscribe/unsubscribe: http://www.paraview.org/mailman/listinfo/paraview
_______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Follow this link to subscribe/unsubscribe: http://www.paraview.org/mailman/listinfo/paraview