[vtkusers] vtp point output not showing in paraview

[Bill Lorensen]

Try writing it in binary.

On Apr 26, 2017 6:13 PM, "Chris Marsh" <chris.marsh at usask.ca> wrote:

> Hi,
>
> I have an unstructured mesh that represents some topography and I am able
> to view this in paraview. I would like to have a set of points overlain
> over this 3D mesh that correspond to various physical locations, so-as to
> more easily interpret my results.
>
> I am following this wiki link pretty much verbatim to write this set of
> points to a VTP file.
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/IO/WriteVTP
>
> I insert a point like
>  points->InsertNextPoint ( UTM_easting,UTM_northing, elevation );
>
> When I write to vtp using ascii output, it looks correct (the negative
> easting value is a result of the projection I'm using).
>
> <Points>
>         <DataArray type="Float32" Name="Points" NumberOfComponents="3"
> format="ascii" RangeMin="3525178.8854" RangeMax="3525178.8854">
>           -2100420 2831098.75 1375.8105469
>         </DataArray>
>       </Points>
>
> However, when I view this in Paraview, I see nothing. No amount of
> fiddling with representation and corresponding size seems to make these
> points visible.
>
> When I compile and run the example linked in the wiki, I am able to see
> the points in 3D glyph mode. However if I modify it to write just 1 point
> to output, e.g.,
>  points->InsertNextPoint (  -2100420, 2831098.75 ,1375.8105469);
> I can not see the point. If I change to 3D glyph-> Sphere I can see it in
> 2D, and if I overlay my unstructured mesh it goes away. Full contents of
> vtp file are below
> Cheers
> Chris
>
> <?xml version="1.0"?>
> <VTKFile type="PolyData" version="0.1" byte_order="LittleEndian"
> header_type="UInt32" compressor="vtkZLibDataCompressor">
>   <PolyData>
>     <Piece NumberOfPoints="1" NumberOfVerts="0" NumberOfLines="0"
> NumberOfStrips="0" NumberOfPolys="0">
>       <PointData>
>       </PointData>
>       <CellData>
>       </CellData>
>       <Points>
>         <DataArray type="Float32" Name="Points" NumberOfComponents="3"
> format="ascii" RangeMin="3525178.8893" RangeMax="3525178.8893">
>           -2100420 2831098.75 1375.8105469
>         </DataArray>
>       </Points>
>       <Verts>
>         <DataArray type="Int64" Name="connectivity" format="ascii"
> RangeMin="1e+299" RangeMax="-1e+299">
>         </DataArray>
>         <DataArray type="Int64" Name="offsets" format="ascii"
> RangeMin="1e+299" RangeMax="-1e+299">
>         </DataArray>
>       </Verts>
>       <Lines>
>         <DataArray type="Int64" Name="connectivity" format="ascii"
> RangeMin="1e+299" RangeMax="-1e+299">
>         </DataArray>
>         <DataArray type="Int64" Name="offsets" format="ascii"
> RangeMin="1e+299" RangeMax="-1e+299">
>         </DataArray>
>       </Lines>
>       <Strips>
>         <DataArray type="Int64" Name="connectivity" format="ascii"
> RangeMin="1e+299" RangeMax="-1e+299">
>         </DataArray>
>         <DataArray type="Int64" Name="offsets" format="ascii"
> RangeMin="1e+299" RangeMax="-1e+299">
>         </DataArray>
>       </Strips>
>       <Polys>
>         <DataArray type="Int64" Name="connectivity" format="ascii"
> RangeMin="1e+299" RangeMax="-1e+299">
>         </DataArray>
>         <DataArray type="Int64" Name="offsets" format="ascii"
> RangeMin="1e+299" RangeMax="-1e+299">
>         </DataArray>
>       </Polys>
>     </Piece>
>   </PolyData>
> </VTKFile>
>
>
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