# Coordinates of point in a 3D Image

**URL:** https://discourse.vtk.org/t/coordinates-of-point-in-a-3d-image/4837
**Category:** Support
**Created:** [December 16, 2020, 4:39pm UTC](https://discourse.vtk.org/t/coordinates-of-point-in-a-3d-image/4837 "2020-12-16T16:39:50Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Luis\_Carlos\_Carneiro](https://discourse.vtk.org/user_avatar/discourse.vtk.org/luis_carlos_carneiro/32/1360_2.png) [@Luis\_Carlos\_Carneiro](https://discourse.vtk.org/u/Luis_Carlos_Carneiro)
#### Post date: [December 16, 2020, 4:39pm UTC](https://discourse.vtk.org/t/coordinates-of-point-in-a-3d-image/4837/1 "2020-12-16T16:39:50Z")

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Dear All,

Having a displayed 3D volume image (with interactor) and with a click with the mouse above the image, how it can be obtained that point (of the click) coordinate in the 3D referential?

Thanks,

Luís Gonçalves

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<div class="post-metadata">

### Author: ![lassoan](https://discourse.vtk.org/user_avatar/discourse.vtk.org/lassoan/32/50_2.png) [@lassoan](https://discourse.vtk.org/u/lassoan)
#### Post date: [December 16, 2020, 10:37pm UTC](https://discourse.vtk.org/t/coordinates-of-point-in-a-3d-image/4837/2 "2020-12-16T22:37:45Z")

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You can find world coordinates of a visible point from display coordinates using picker classes.