[vtkusers] vtp point output not showing in paraview

[Chris Marsh]

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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