1- use vtkCellPicker
2- get picked cell then loop the edges
3- calculate distance between “clickedcoord” and each edge and find minimum
4- use minimum edge points to get ids from edge data using FindPoint function
5- use GetPointCells function on edge data to get cells of point 1 and 2 of the selected edge
6- the common cell id is the line id in your edge data
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