[Ves] How to return the cell ID I have taped.

[Bo Yu]

Hi all,
I am trying to using ves to make an iPad app for 3d model processing.
The librarys works well and I can load different dataset.
But I met a problem and I don't know how to solve:
I try to get the selected cell ID of the model by tap on the screen?
Before I use "vtkCellPicker" to get such work done with mouse interaction
in PC environment.

Thank you very much if you can give me some hint.

Bo Yu
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