[Paraview] how to work with cells having interior nodes?

[Alejandro Aragon]

Hello everyone,

I was forced to code the cubic triangle (T10) in my finite element  
code. This element has an interior node, so I was wondering if any of  
you came across this. I was taking a look at the vtk cell types and  
the higher the triangle goes is a quadratic triangle. I tried to use  
the vtk_polygon, but I get the following error:

ERROR: In /Users/berk/Work/ReleaseBuilds/ParaView3/VTK/IO/ 
vtkXMLUnstructuredDataReader.cxx, line 653
vtkXMLUnstructuredGridReader (0x2400beb0): Cannot read cell  
connectivity from Cells in piece 0 because the "connectivity" array is  
not long enough.

I checked the connectivity array and it contains the exact number of  
cells, so I guess the problem is that paraview is not connecting those  
interior nodes. I thought that one way to solve this was to  
triangulate the T10, but that is going to take some time to code so I  
was wondering if there is a shortcut around it.

Thank you all,

Alejandro M. Aragón