[Paraview] visualising a network of tubes and spheres using python programmable filter

[Sreejith Kuttanikkad]

Dear all,
On Wed, Apr 15, 2009 at 6:26 PM, Utkarsh Ayachit <
utkarsh.ayachit at kitware.com> wrote:

> Read in the sphere radii and tube radii as point data on the dataset
> that you are creating. Both the glyph filter and the tube filter has
> options that allow you to scale the glyph (and the tube) by point
> data.
>

I have been trying many things but still not able to get what i wanted. For
instance; please find a polydata xml file i created for a small cubic
network (8 spheres and 12 tubes).

<?xml version="1.0"?>
<VTKFile type="PolyData" version="0.1" byte_order="LittleEndian">
<PolyData>
<Piece NumberOfPoints="8" NumberOfVerts="0" NumberOfLines="12"
NumberOfStrips="0" NumberOfPolys="0">
<Points>
<DataArray type="Float32" NumberOfComponents="3" format="ascii">
0 0 0
1 0 0
0 1 0
1 1 0
0 0 1
1 0 1
0 1 1
1 1 1
</DataArray>
</Points>
<Lines>
<DataArray type="Int32" Name="connectivity" format="ascii">
0 1 2 3 0 2 1 3 4 5 6 7 4 6 5 7 0 4 1 5 2 6 3 7
</DataArray>
<DataArray type="Int32" Name="offsets" format="ascii">
2 4 6 8 10 12 14 16 18 20 22 24
</DataArray>
</Lines>
<PointData Scalars="sph_dia">
<DataArray type="Float32" Name="sph_dia" format="ascii">
 2 5 6 8 9 4 3 8
</DataArray>
</PointData>
</Piece>
</PolyData>
</VTKFile>


If I read the above file with paraview and apply Glyph (sphere) and tube
filter, I can view the network with spheres and tubes. If i choose the scale
mode scalar and choose sph_dia, i can view spheres with different size.
Similarly If i choose "vary radius" option to tubes, the size of the tube is
varied based on the point data (sph_dia) and looks tapered (gradual change
in size) as shown in the attachment. But that is not I wanted. I have tube
diameter data and would like to be able to scale based on that and tube
should have uniform diameter from one end to the other.  Please let me know
if you have any suggestion or tips to attempt.

thank you
Sreejith
IMFT Toulouse
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