[vtkusers] vtp point output not showing in paraview

[Chris Marsh]

Doesn't seem to help. Gaussian point seems to work if I crank the radius
up. Is this perhaps the correct way?



On 26 April 2017 at 16:23, Bill Lorensen <bill.lorensen at gmail.com> wrote:

> 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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