Re: vtkm help with using the CleanGrid filter

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For the clean grid filter, you can just use the `vtkmCleanGrid` filter in
VTK, which takes care of the conversions and everything for you.

If you want to use the vtk-m filters directly with a dataset built using
tovtkm::Convert, it is necessary to pass a Policy to the filter so that it
is aware of the custom data structures used to adapt VTK into VTK-m. See
the Accelerators/Vtkm/vtkmCleanGrid.cxx file in VTK for an example of this:

#include "vtkmFilterPolicy.h"

vtkmInputFilterPolicy policy;

vtkm::filter::CleanGrid filter;

auto result = filter.Execute(in, policy);

HTH, Allie

On Thu, Jun 27, 2019 at 11:06 AM sunayanag <[email protected]> wrote:

> Hi All,
>
> Just started using vtk-m and having some issues with the CleanGrid filter.
> Assuming that vtkMesh is an object of type vtkSmartPointer<vtkPolyData>,
> here is the piece of code
>
> vtkm::cont::DataSet mMesh = tovtkm::Convert(vtkMesh,
> tovtkm::FieldsFlag::PointsAndCells);
> vtkm::filter::CleanGrid cleanGrid;
>
> try
> {
>     vtkm::cont::DataSet outMesh = cleanGrid.Execute(mMesh);
> }
>  catch(std::exception& e)
>  {
>      std::cerr << e.what();
> }
>
> where the exception thrown is: /Could not find appropriate cast for cell
> set./
>
> could anyone help with what I am getting wrong.
>
> Thanks
> Sunayana
>
>
>
> --
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<div dir=3D"ltr">For the clean grid filter, you can just use the `vtkmClean=
Grid` filter in VTK, which takes care of the conversions and everything for=
 you.<br><br>If you want to use the vtk-m filters directly with a dataset b=
uilt using tovtkm::Convert, it is necessary to pass a Policy to the filter =
so that it is aware of the custom data structures used to adapt VTK into VT=
K-m. See the Accelerators/Vtkm/vtkmCleanGrid.cxx file in VTK for an example=
 of this:<br><br><p style=3D"margin:0px;white-space:pre-wrap"><font color=
=3D"#000000">#include &quot;vtkmFilterPolicy.h&quot;
<br></font></p><p style=3D"margin:0px;white-space:pre-wrap"><font color=3D"=
#000000">vtkmInputFilterPolicy policy;
</font></p><p style=3D"margin:0px;white-space:pre-wrap"><font color=3D"#000=
000">vtkm::filter::CleanGrid filter;</font></p><p style=3D"margin:0px;white=
-space:pre-wrap"><font color=3D"#000000">auto result =3D filter.Execute(in,=
 policy);<br></font></p><p style=3D"margin:0px;white-space:pre-wrap">
HTH,
Allie</p></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gma=
il_attr">On Thu, Jun 27, 2019 at 11:06 AM sunayanag &lt;<a href=3D"mailto:s=
[email protected]">[email protected]</a>&gt; wrote:<br></div><blockquote=
 class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px so=
lid rgb(204,204,204);padding-left:1ex">Hi All,<br>
<br>
Just started using vtk-m and having some issues with the CleanGrid filter.<=
br>
Assuming that vtkMesh is an object of type vtkSmartPointer&lt;vtkPolyData&g=
t;,<br>
here is the piece of code<br>
<br>
vtkm::cont::DataSet mMesh =3D tovtkm::Convert(vtkMesh,<br>
tovtkm::FieldsFlag::PointsAndCells);<br>
vtkm::filter::CleanGrid cleanGrid;<br>
<br>
try <br>
{<br>
=C2=A0 =C2=A0 vtkm::cont::DataSet outMesh =3D cleanGrid.Execute(mMesh);<br>
}<br>
=C2=A0catch(std::exception&amp; e)<br>
=C2=A0{<br>
=C2=A0 =C2=A0 =C2=A0std::cerr &lt;&lt; e.what();<br>
}<br>
<br>
where the exception thrown is: /Could not find appropriate cast for cell<br=
>
set./<br>
<br>
could anyone help with what I am getting wrong.<br>
<br>
Thanks<br>
Sunayana<br>
<br>
<br>
<br>
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Sent from: <a href=3D"http://vtk.1045678.n5.nabble.com/VTK-Users-f1224199.h=
tml" rel=3D"noreferrer" target=3D"_blank">http://vtk.1045678.n5.nabble.com/=
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<br>
Please keep messages on-topic and check the VTK FAQ at: <a href=3D"http://w=
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Search the list archives at: <a href=3D"http://markmail.org/search/?q=3Dvtk=
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</blockquote></div>

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