[Paraview] how to draw a mesh in preview

[Cory Quammen]

Hi Neil,

There is nothing that I know of in VTK or ParaView that will convert your
CSV file into a vtkPolyData out of the box. You'll need to create a
vtkPolyData "manually". Please see

http://www.vtk.org/Wiki/VTK/Examples/Cxx/IO/ReadPlainTextTriangles

for an example of how to do this in VTK. You can convert this example into
Python and then use the script in a Python Source in ParaView.

HTH,
Cory

On Thu, Feb 4, 2016 at 8:30 AM, Neil Srinivasan <neilsrini at gmail.com> wrote:

> Hi I am new to Paraview
>
> Can you help
>
> I have data in a CSV spreadsheet.
>
>
> It contains the xyz point coordinates of a 3D shape (20,000+ nodes).
>
> The file also contains the triangulation coordinates in 3 separate columns
> for these nodes (40000 + triangulations). These create the faces of the mesh
>
> I can work out how to plot the points, using
>
> Filter—Table to points.
>
>
> How do I plot the faces?
> Do the 3 columns need to be turned into an array?
>
>
> And how do I colour the faces or contour them by another value (called
> "bi" in the spreadsheet)
>
>
>
> here is an example of the spreadsheet
>
> nn = node number
>
> the 3d coordinates of the points are x, y, z
>
> and the faces of the mesh are specified by (XYZ)
>
> I WISH TO PLOT Points (x, y, x) , draw faces (XYZ) colour by “bi"
>
>
>
> in matlab
>
> it would be
>
>
> trisurf(Tri,X,Y,Z,C)
>
>
> where Tri = array(XYX)
>
> X,Y,Z = (x, y, z)
>
> c= "bi"
>
>
>
>
>
> nn x y z X Y Z uni bi
> 0 39.527 28.202 160.219 3435 19658 2764 3.86942 0.74871
> 1 70.804 -2.966 157.578 3161 17204 9466 6.64361 0.78373
> 2 48.982 -25.674 109.022 18424 17467 16955 5.02491 1.0451
> 3 83.514 -9.096 120.988 13600 19721 2669 4.47977 0.9348
> 4 -16.04 -39.749 188.467 1564 10099 10091 1.90873 0.73286
> 5 74.526 -3.096 174.347 21598 19018 21205 8.4263 0.70594
> 6 54.93 -56.347 151.496 21283 11341 18399 7.53334 2.17128
> 7 56.936 -20.131 186.177 1171 2723 20833 7.16118 1.44875
> 8 -14.627 -47.1 162.185 51 15729 15865 2.13939 0.70887
> 9 38.207 -59.201 147.993 9331 5851 9106 5.83457 4.32971
> 10 50.645 -32.04 110.418 310 3513 9121 5.3741 1.14543
>
>
>
>
>
>
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-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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