[General] selected cells in python programmable filter

ufocfd · April 19, 2017, 10:44

How do you operate on screen selected cells (Select Cells On) from within the Python Programmable Filter?

ufocfd · April 22, 2017, 03:14

managed to achieve this using the code below (using tools > python shell):

from paraview.simple import *

####extract
ExtractSelection()
Show()

####filter
trans_prog_filter = ProgrammableFilter()
RenameSource("Translate", trans_prog_filter)
trans_prog_filter.Script = """
pdi = self.GetInput()
pdo = self.GetOutput()
newPoints = vtk.vtkPoints()
numPoints = pdi.GetNumberOfPoints()
for i in range(0, numPoints):
coord = pdi.GetPoint(i)
x, y, z = coord[:3]
x = x - 1.0
y = y + 0.0
z = z + 0.0
newPoints.InsertPoint(i, x, y, z)
pdo.SetPoints(newPoints)
"""
Show()

New-to-CFD · May 29, 2017, 12:46

hey there,

I am having and issue that you may have experience or have some knowledge on.

Do you know if its possible to specify the selected cells from the python shell?

Instead of using "Select Cells" and dragging over an area, maybe specifying a bounding box in python to select the cells automatically?

Regards,

Derek

ufocfd · May 30, 2017, 10:05

I would suggest using the "start trace" feature in the "Tools" section to explore which python script corresponds to which cell selection method. You should be able to come up with a solution that way, by trying different methods. Try the "Clip" filter based on sphere radius and location to start with, and see how that is done using python commands. The start/stop trace feature is a really useful method (I think) to explore different python script, without having to Google it first. Good luck.

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April 22, 2017, 03:14		#2
ufocfd Member Giles Richardson Join Date: Jun 2012 Location: Cambs UK Posts: 98 Rep Power: 13	managed to achieve this using the code below (using tools > python shell): from paraview.simple import * ####extract ExtractSelection() Show() ####filter trans_prog_filter = ProgrammableFilter() RenameSource("Translate", trans_prog_filter) trans_prog_filter.Script = """ pdi = self.GetInput() pdo = self.GetOutput() newPoints = vtk.vtkPoints() numPoints = pdi.GetNumberOfPoints() for i in range(0, numPoints): coord = pdi.GetPoint(i) x, y, z = coord[:3] x = x - 1.0 y = y + 0.0 z = z + 0.0 newPoints.InsertPoint(i, x, y, z) pdo.SetPoints(newPoints) """ Show()

May 29, 2017, 12:46		#3
New-to-CFD New Member MASc Student Join Date: Sep 2016 Posts: 25 Rep Power: 9	hey there, I am having and issue that you may have experience or have some knowledge on. Do you know if its possible to specify the selected cells from the python shell? Instead of using "Select Cells" and dragging over an area, maybe specifying a bounding box in python to select the cells automatically? Regards, Derek

May 30, 2017, 10:05		#4
ufocfd Member Giles Richardson Join Date: Jun 2012 Location: Cambs UK Posts: 98 Rep Power: 13	I would suggest using the "start trace" feature in the "Tools" section to explore which python script corresponds to which cell selection method. You should be able to come up with a solution that way, by trying different methods. Try the "Clip" filter based on sphere radius and location to start with, and see how that is done using python commands. The start/stop trace feature is a really useful method (I think) to explore different python script, without having to Google it first. Good luck.