# Contour not highlighting.
**URL:** https://discourse.paraview.org/t/contour-not-highlighting/958
**Category:** ParaView Support
**Created:** [November 26, 2018, 2:53pm UTC](https://discourse.paraview.org/t/contour-not-highlighting/958 "2018-11-26T14:53:00Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@Hiren](https://discourse.paraview.org/u/Hiren)
#### Post date: [November 26, 2018, 2:53pm UTC](https://discourse.paraview.org/t/contour-not-highlighting/958/1 "2018-11-26T14:53:00Z")
In GUI , why contour option is not highlighted?
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### Author:  [@dcthomp](https://discourse.paraview.org/u/dcthomp)
#### Post date: [November 26, 2018, 3:04pm UTC](https://discourse.paraview.org/t/contour-not-highlighting/958/2 "2018-11-26T15:04:07Z")
@hiren The contour operation requires point data, not cell data. Try running the CellToPointData filter on your dataset. Note that this averages the cell data values from all cells connected to a point to obtain the value at that point.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [November 26, 2018, 3:07pm UTC](https://discourse.paraview.org/t/contour-not-highlighting/958/3 "2018-11-26T15:07:03Z")
As a side note, you can see why a filter cannot be applied by hovering over it and reading the status bug on the bottom right of ParaView window.
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### Author:  [@Hiren](https://discourse.paraview.org/u/Hiren)
#### Post date: [November 26, 2018, 3:41pm UTC](https://discourse.paraview.org/t/contour-not-highlighting/958/4 "2018-11-26T15:41:30Z")
thanks a lot. i got it.
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### Author:  [@Hiren](https://discourse.paraview.org/u/Hiren)
#### Post date: [November 26, 2018, 4:22pm UTC](https://discourse.paraview.org/t/contour-not-highlighting/958/5 "2018-11-26T16:22:58Z")
i got such other problem…
Generic Warning: In C:\bbd\ecd3383f\build\superbuild\paraview\src\VTK\Common\DataModel\vtkPolyhedron.cxx, line 1679
A cell with a non-manifold triangulation has been encountered. This cell cannot be contoured.
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### Author:  [@Kenneth\_Moreland](https://discourse.paraview.org/u/Kenneth_Moreland)
#### Post date: [November 26, 2018, 4:57pm UTC](https://discourse.paraview.org/t/contour-not-highlighting/958/6 "2018-11-26T16:57:20Z")
It sounds like your data has a malformed polyhedron. From the [wiki documentation of polyhedrons](https://www.vtk.org/Wiki/VTK/Polyhedron_Support):
> Both convex and concave polyhedrons are supported. However the polyhedrons need to be watertight, non-self-intersecting and manifold (each edge is used exactly twice), and the face polygons needs to be planar.
We cannot say for sure without seeing your data, but from the error message it sounds like your data has a polyhedron that is not completely enclosed by the faces it defines.
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### Author:  [@wascott](https://discourse.paraview.org/u/wascott)
#### Post date: [November 26, 2018, 6:15pm UTC](https://discourse.paraview.org/t/contour-not-highlighting/958/7 "2018-11-26T18:15:15Z")
With regards to the hover over a greyed out icon, and it will show you why it is grayed out, this only works for the shortcut toolbars (such as Common). Why can’t we do something like this for the Filters/ Alphabetical list? Am I missing something, or is this a viable feature request?
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [November 27, 2018, 8:29am UTC](https://discourse.paraview.org/t/contour-not-highlighting/958/8 "2018-11-27T08:29:37Z")
It is a Qt5 related bug and I’ve already opened an issue about one year ago :
[https://gitlab.kitware.com/paraview/paraview/issues/17134](https://gitlab.kitware.com/paraview/paraview/issues/17134)
It should be fixed imo.
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### Author:  [@Hiren](https://discourse.paraview.org/u/Hiren)
#### Post date: [November 27, 2018, 2:09pm UTC](https://discourse.paraview.org/t/contour-not-highlighting/958/9 "2018-11-27T14:09:33Z")
Hey thank you for the Reply.
how can i solve this issue, any suggestion?
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### Author:  [@Kenneth\_Moreland](https://discourse.paraview.org/u/Kenneth_Moreland)
#### Post date: [November 27, 2018, 2:33pm UTC](https://discourse.paraview.org/t/contour-not-highlighting/958/10 "2018-11-27T14:33:17Z")
Your data is coming from somewhere, and wherever that somewhere is, it is writing bad data files. Whatever is writing your data files should be fixed to write correct data files.