sample00.vtu

<VTKFile type="UnstructuredGrid" version="2.0" byte_order="LittleEndian" header_type="UInt64">
  <UnstructuredGrid>
    <Piece NumberOfPoints="2" NumberOfCells="2">
      <!--> 
	  Begins to write particle data like scalar, vector, tensor, ... 
	  "dummy" is dummy in <PointData> definition. Paraview will assign name items from <DataArray>
	  <-->
      <PointData Scalars="dummy" GlobalIds="__d3_id__">
	<DataArray type="Float64" Name="dummy" Format="ascii" RangeMin="0.0" RangeMax="10.0">
	  1.0 0.5
	</DataArray>
	<DataArray type="Float64" Name="dummy2" Format="ascii" RangeMin="0.0" RangeMax="10.0">
	  0.5 0.7
	</DataArray>
	<DataArray type="Int64" Name="vtkGhostType" Format="ascii" RangeMin="0" RangeMax="0">
	  0 0
	</DataArray>
	 <!--> 
	     __d3_id__ is the id of each particle when filted using D3. In other words, this is the
	     global id and the RangeMax must be the (total number of particles - 1) over all VTU files.
	     Note that index in VTK begins as 0 (zero).
	  <-->
	 <DataArray type="Int64" Name="__d3_id__" Format="ascii" RangeMin="0" RangeMax="100">
	  0 15
	</DataArray>
      </PointData>
      <!--> 
	  PointData definition is completed here.
	  CellData definition begins now. Even though particle simulations don't have any element or Cell
	  definition, a dummy definition is required as VTK grammar.
	  <-->
      <CellData>
	<DataArray type="Int64" Name="vtkOriginalCellIds" Format="ascii" RangeMin="0" RangeMax="100">
	  5 55
	</DataArray>
	<!--> 
	    Note that vtkGhostType is repeated in CellData region 
	    <-->
	<DataArray type="Int64" Name="vtkGhostType" Format="ascii" RangeMin="0" RangeMax="0">
	  0 0
	</DataArray>
      </CellData>
      <Points>
	<!--> 
	    This section describes the position data of particles.
	    2D seems not supported as of Feb 2016 
	    <-->
	<DataArray type="Float64" Name="Points" NumberOfComponents="3" Format="ascii" RangeMin="0.0" RangeMax="5.0e3">
	  1.0 5.0 15. 35. 15. 20.
	</DataArray>
      </Points>
      <Cells>
	<DataArray type="Int64" Name="connectivity" Format="ascii" RangeMin="0" RangeMax="1">
	  0 1
	</DataArray>
	<DataArray type="Int64" Name="offsets" Format="ascii" RangeMin="1" RangeMax="2">
	  1 2
	</DataArray>
	<DataArray type="UInt8" Name="types" Format="ascii" RangeMin="2" RangeMax="2">
	  2 2
	</DataArray>
      </Cells>
    </Piece>
  </UnstructuredGrid>
</VTKFile>