# vtkPropPicker in VTK 9.1 is now returning wrong world coordinates.

**URL:** https://discourse.vtk.org/t/vtkproppicker-in-vtk-9-1-is-now-returning-wrong-world-coordinates/8061
**Category:** Development
**Created:** [March 15, 2022, 9:16pm UTC](https://discourse.vtk.org/t/vtkproppicker-in-vtk-9-1-is-now-returning-wrong-world-coordinates/8061 "2022-03-15T21:16:16Z")
**Posts on this page:** 1
**Showing post:** 6

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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: [April 12, 2022, 9:48pm UTC](https://discourse.vtk.org/t/vtkproppicker-in-vtk-9-1-is-now-returning-wrong-world-coordinates/8061/6 "2022-04-12T21:48:12Z")

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I need NaN-valued cells to be rendered transparent. Will `ForceOpaque` make NaN’s opaque?

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_[View the full topic](https://discourse.vtk.org/t/vtkproppicker-in-vtk-9-1-is-now-returning-wrong-world-coordinates/8061)._