[Paraview] mapping scalars onto surface geometry

[Richardson CFD]

Kenneth, wonderful - that's done the trick (see attached).
A quick and simple solution!

Whats the difference between an image file (and the unstructured data file
that I have created)?

Thanks very much, Giles.

On Sun, Feb 7, 2016 at 6:31 AM, Moreland, Kenneth <kmorel at sandia.gov> wrote:

> Giles,
>
> I think I've figured out your problem. The scalars data you sent me is an
> unstructured grid with "voxel"-type cells. One of my least favorite
> features of VTK is that there is a distinction between a box in an
> unstructured grid (called a hexahedra) and a box in a data set with
> structured grid (called a voxel). These two cells are essentially the same
> shape, but the order of the points is different.
>
> The reason why I dislike this feature is that it is technically allowable
> to put voxel cells in an unstructured grid. However, this fouls up lots of
> filters that don't check for this corner case. Apparently the probe filter,
> which is the underlying filter for resample with dataset, is one of the
> filters broken for voxels. (Unless there is something else about this
> dataset that I am missing.) I submitted a bug about this (
> http://www.paraview.org/Bug/view.php?id=15982).
>
> The most expedient way around this problem is to run the tetrahedralize
> filter on the scalars. That will convert the voxels to tetrahedra
> correctly, and the probe filter has no problem on that data type. The
> interpolation will be slightly different but close. Overall a better
> solution is to save your data as image data rather than convert it to an
> unstructured grid. The file will be smaller and the interpolation should
> happen correctly.
>
> -Ken
>
> From: Richardson CFD <garcfd at gmail.com>
> Date: Saturday, February 6, 2016 at 5:54 AM
> To: "paraview at paraview.org" <paraview at paraview.org>, Kenneth Moreland <
> kmorel at sandia.gov>
> Subject: [EXTERNAL] mapping scalars onto surface geometry
>
> Kenneth,
>
> I have made two files here available for download (sphere.stl and
> scalars.vtk).
>
>
> https://drive.google.com/file/d/0B4bNbYR3XwvQVlBZNlVBX0RXSkU/view?usp=sharing
>
>
> https://drive.google.com/file/d/0B4bNbYR3XwvQTkJxRDhLb0MxZGc/view?usp=sharing
>
> I hope you can give these a try using "Resample with Dataset" to see what
> the problem is.
>
> Regards Giles.
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