# Vtk.js: Convert the selection point into world coordinates

**URL:** https://discourse.vtk.org/t/vtk-js-convert-the-selection-point-into-world-coordinates/473
**Category:** Web
**Created:** [March 13, 2019, 4:22am UTC](https://discourse.vtk.org/t/vtk-js-convert-the-selection-point-into-world-coordinates/473 "2019-03-13T04:22:58Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![qingchen](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/q/c0e974/32.png) [@qingchen](https://discourse.vtk.org/u/qingchen)
#### Post date: [March 13, 2019, 4:22am UTC](https://discourse.vtk.org/t/vtk-js-convert-the-selection-point-into-world-coordinates/473/1 "2019-03-13T04:22:58Z")

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Hello,  
I used example GeometryViewer to load a VTP file and selected a point using PointPicker , this point is sometimes marked on the back of the selected point. But I want to return the closest point to the surface of the current mouse click, not to the back.

**Questions:**  
Picker class converts world coordinates whether you can set values that return only the selected surface?

Can anyone please help me?

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### Author: ![Sebastien\_Jourdain](https://discourse.vtk.org/user_avatar/discourse.vtk.org/sebastien_jourdain/32/100_2.png) [@Sebastien\_Jourdain](https://discourse.vtk.org/u/Sebastien_Jourdain)
#### Post date: [March 13, 2019, 4:26am UTC](https://discourse.vtk.org/t/vtk-js-convert-the-selection-point-into-world-coordinates/473/2 "2019-03-13T04:26:52Z")

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> <https://github.com/Kitware/vtk-js/issues/1026>