# vtkimagedata scalar value at specific point(world point)

**URL:** https://discourse.vtk.org/t/vtkimagedata-scalar-value-at-specific-point-world-point/7312
**Category:** Support
**Created:** [December 2, 2021, 11:25am UTC](https://discourse.vtk.org/t/vtkimagedata-scalar-value-at-specific-point-world-point/7312 "2021-12-02T11:25:20Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Hyunwoo\_Kim](https://discourse.vtk.org/user_avatar/discourse.vtk.org/hyunwoo_kim/32/3465_2.png) [@Hyunwoo\_Kim](https://discourse.vtk.org/u/Hyunwoo_Kim)
#### Post date: [December 2, 2021, 11:25am UTC](https://discourse.vtk.org/t/vtkimagedata-scalar-value-at-specific-point-world-point/7312/1 "2021-12-02T11:25:20Z")

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Hello, I’m trying to get scalar from vtkimagedata

I set scalars to the vtkimagedata (0,1,2,3,4,5, etc)

And I want to get interpolated data such as 0.99955, 1.4325… at a single 3D point which is inside the bound of image.

How can I calculate that?

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### Author: ![Paulo\_Carvalho](https://discourse.vtk.org/user_avatar/discourse.vtk.org/paulo_carvalho/32/370_2.png) [@Paulo\_Carvalho](https://discourse.vtk.org/u/Paulo_Carvalho)
#### Post date: [December 3, 2021, 8:59pm UTC](https://discourse.vtk.org/t/vtkimagedata-scalar-value-at-specific-point-world-point/7312/2 "2021-12-03T20:59:17Z")

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Hello,

As far as I know, values in a `vtkImageData` are cell-centered (a voxel has a singe color). So, if you probe a location it’ll likely fall inside one cell (not interpolated).

regards,

Paulo