[vtkusers] Unsuccessful vtkXMLUnstructuredGridReader

[Chung-Kan Huang]

Hi,
I am working on my first vtk application (tcl) that I want to read a .vtu
file which contains several scalar data and select one of them to be drawn
in the window.

But for some reason I cannot see the effect I like so I wonder if anyone
here can give me some pointers, thank in advance.

(I have tried to open my .vtu file in Paraview and it works so I don't think
it is because of my .vtu file.)


My tcl file:
===============================================
package require vtk

vtkXMLUnstructuredGridReader greader
    greader SetFileName "3dfiscr02-20-M.vtu"


vtkAssignAttribute a
    a SetInput [greader GetOutput]
    a Assign "P0" SCALARS POINT_DATA


vtkLookupTable table
    table SetHueRange  0 1
    table SetSaturationRange 0 1

vtkColorTransferFunction ctf
    ctf SetColorSpaceToHSV

vtkDataSetMapper mapper
    mapper SetInput [a GetOutput]
    mapper SetLookupTable table
    set datarange [mapper GetScalarRange]
    puts $datarange

vtkActor actor
    actor SetMapper mapper

vtkCamera camera
    camera SetFocalPoint 1 1 1

vtkRenderer ren
    ren AddActor actor
    ren SetBackground 0 0 0
    ren SetActiveCamera camera
    ren ResetCamera

vtkRenderWindow renWin
   renWin AddRenderer ren
   renWin SetSize 500 500
   renWin Render

vtkRenderWindowInteractor iren
   iren SetRenderWindow renWin

iren Initialize

# prevent the tk window from showing up then start the event loop
wm withdraw .


The structure of my .vtu file
===============================================
<?xml version="2.0"?>
<VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian">
<UnstructuredGrid>
<Piece NumberOfPoints="1718" NumberOfCells="8223">
<Points>
<DataArray type="Float64" format="ascii" NumberOfComponents="3">
x y z
...
...
...

</DataArray>
</Points>
<Cells>
<DataArray type="Int32" Name="connectivity" format="ascii">
v1 v2 v3 v4
....
....
....
</DataArray>
<DataArray type="Int32" Name="offsets" format="ascii">
4
8
12
16
.
.
.
</DataArray>
<DataArray type="UInt8" Name="types" format="ascii">
10
10
.
.
.
</DataArray>
</Cells>
<PointData Scalar="P0 S0 ">
<DataArray type="Float32" Name="P0" format="ascii">
159.488
.
.
.
</DataArray>
<DataArray type="Float64" Name="P0" format="ascii">
0.1
.
.
.
</DataArray>
</PointData>
</Piece>
</UnstructuredGrid>
</VTKFile>










-- 
ckhuangf at hotmail.com
Chung.Kan.Huang at utah.edu
http://www.perc.utah.edu/Members/ckhuangf

Office: 801-585-5594
Cell: 801-651-8098
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