# Footpoints of streamline
**URL:** https://discourse.paraview.org/t/footpoints-of-streamline/14021
**Category:** ParaView Support
**Created:** [February 26, 2024, 10:35am UTC](https://discourse.paraview.org/t/footpoints-of-streamline/14021 "2024-02-26T10:35:33Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@ssmaity](https://discourse.paraview.org/u/ssmaity)
#### Post date: [February 26, 2024, 10:35am UTC](https://discourse.paraview.org/t/footpoints-of-streamline/14021/1 "2024-02-26T10:35:34Z")
Hi, I would like to extract the coordinate of the footprints of streamlines. Thanks in advance.
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### Author:  [@Kenneth\_Moreland](https://discourse.paraview.org/u/Kenneth_Moreland)
#### Post date: [February 26, 2024, 10:40am UTC](https://discourse.paraview.org/t/footpoints-of-streamline/14021/2 "2024-02-26T10:40:29Z")
Um, what is a streamline footprint?
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### Author:  [@ssmaity](https://discourse.paraview.org/u/ssmaity)
#### Post date: [February 26, 2024, 2:08pm UTC](https://discourse.paraview.org/t/footpoints-of-streamline/14021/3 "2024-02-26T14:08:01Z")
The endpoints of streamlines.
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### Author:  [@Kenneth\_Moreland](https://discourse.paraview.org/u/Kenneth_Moreland)
#### Post date: [February 27, 2024, 7:33pm UTC](https://discourse.paraview.org/t/footpoints-of-streamline/14021/4 "2024-02-27T19:33:56Z")
I can’t think of any existing filters that will do this easily. But I think a `Programmable Filter` with this script will extract the first and last point of each streamline:
```py
input0 = inputs[0]
numCells = input0.GetNumberOfCells()
# Clear output
output.DeepCopy(vtk.vtkPolyData())
newPoints = vtk.vtkPoints()
newPoints.Resize(numCells * 2)
output.AllocateEstimate(0, 1, numCells, 2, 0, 0, 0, 0)
for cellIndex in range(numCells):
cellPoints = input0.GetCell(cellIndex).GetPoints()
firstPoint = cellPoints.GetPoint(0)
lastPoint = cellPoints.GetPoint(cellPoints.GetNumberOfPoints() - 1)
ptidx1 = newPoints.InsertNextPoint(firstPoint)
ptidx2 = newPoints.InsertNextPoint(lastPoint)
output.InsertNextCell(vtk.VTK_LINE, (ptidx1, ptidx2))
output.SetPoints(newPoints)
```
