# VTK: how to set the threshold for vtkPropPicker

**URL:** https://discourse.vtk.org/t/vtk-how-to-set-the-threshold-for-vtkproppicker/4833
**Category:** Support
**Created:** [December 16, 2020, 1:59pm UTC](https://discourse.vtk.org/t/vtk-how-to-set-the-threshold-for-vtkproppicker/4833 "2020-12-16T13:59:11Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![zhang-qiang-github](https://discourse.vtk.org/user_avatar/discourse.vtk.org/zhang-qiang-github/32/2519_2.png) [@zhang-qiang-github](https://discourse.vtk.org/u/zhang-qiang-github)
#### Post date: [December 23, 2020, 12:31am UTC](https://discourse.vtk.org/t/vtk-how-to-set-the-threshold-for-vtkproppicker/4833/3 "2020-12-23T00:31:54Z")

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@lassoan， I find the `vtkCellPicker` has the set tolerance method. But, the world point from `vtkCellPicker` and `vtkPropPicker` is not equal. And there is more [details](https://discourse.vtk.org/t/vtk-provide-three-different-world-point-converted-from-three-methods-with-one-display-point/4843). Is there any thing wrong with my code?

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