[vtkusers] Unstructured grid to structured grid?

[David Gobbi]

Hi Chris,

This sounds like a job for vtkProbeFilter.  The probe filter takes two inputs,
the "input" and the "source".  The idea is that it resamples the scalars from
the "source" onto the geometry of the "input".  So, in this case, the "source"
is your unstructured grid, and the "input" is any vtkImageData that has the
origin, spacing, and extent that you want to use for the regridding.  The
output of vtkProbeFilter will be an image that has the same geometry as
the input, but that has pixel values that have been interpolated from your
unstructured grid.  You should be able to find several examples on the
wiki.

 - David


On Mon, Sep 15, 2014 at 3:59 PM, chrism <chris.marsh at usask.ca> wrote:
> Is it possible to (easily) convert an unstructured grid to a structured grid
> (Image data)?
>
> Is unstructured -> polydata -> image data  the only way? If so, how example
> (http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/DataSetSurfaceFilter ??)
>
> Ultimately, the unstructured grid represents a topography, and I am looking
> to 'rasterize' it for use in a GIS.