# Sub-element isosurfaces for VTK unstructured grid
**URL:** https://discourse.paraview.org/t/sub-element-isosurfaces-for-vtk-unstructured-grid/999
**Category:** ParaView Support
**Created:** [December 4, 2018, 5:44pm UTC](https://discourse.paraview.org/t/sub-element-isosurfaces-for-vtk-unstructured-grid/999 "2018-12-04T17:44:21Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@AnderBiguri](https://discourse.paraview.org/u/AnderBiguri)
#### Post date: [December 4, 2018, 5:44pm UTC](https://discourse.paraview.org/t/sub-element-isosurfaces-for-vtk-unstructured-grid/999/1 "2018-12-04T17:44:21Z")
Hi,
I have a VTK unstructured grid with scalar values and I’d like to obtain an isosurface for it. However, when I use the threshold filter, the result is not “sub-element” as in the elements are either in or out, but there is no smooth isosurface. The same result comes from the use of the Isovolume filter. I read that the contour filter may work, but it is apparently disabled for my type of data.
Is there any way I can get a smooth isosurface for this data?
---
### Author:  [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)
#### Post date: [December 4, 2018, 5:49pm UTC](https://discourse.paraview.org/t/sub-element-isosurfaces-for-vtk-unstructured-grid/999/2 "2018-12-04T17:49:49Z")
> I read that the contour filter may work, but it is apparently disabled for my type of data.
Sounds like you have only cell data available. You can run **Cell Data to Point Data** to get the point-associated data the **Contour** filter needs to produce a surface.
---
### Author:  [@AnderBiguri](https://discourse.paraview.org/u/AnderBiguri)
#### Post date: [December 4, 2018, 6:00pm UTC](https://discourse.paraview.org/t/sub-element-isosurfaces-for-vtk-unstructured-grid/999/3 "2018-12-04T18:00:33Z")
Fantastic, thanks for the reply.