[Paraview] Visualize a curve field

[Samuel Key]

Greetings Dave,

This is a request for a minor(?) alter in a VTK rendering algorithm.

Polyhedral finite elements are reaching a level of numerical maturity 
where their use is likely to become widespread  -- and correspondingly 
an increased desire to display them in ParaView. For convex polygonal 
faces of a polyhedron, the VTK algorithms work fine, and omitting the 
interior triangle edges was a nice rendering improvement.

However, the discrete numerical algorithms that have emerged 
surprisingly work for polyhedrons that have the "star property." Long 
story told short, the attached ParaView figure in the right hand panel 
contains a polyhedral finite element that has a non-planar, concave 
polygonal face. Numerically, this polyhedral configuration works very well.

Would it be possible for rendering purposes, to create the polygon's 
triangular sub-facets by starting with the polygon's vertex closest to 
the average coordinate of the polygon's vertex nodal points? Maybe this 
particular polygon vertex becomes a "common" vertex for all of the 
sub-triangles?

Samuel W. Key
FMA Development, LLC


On 8/1/2012 4:27 AM, David E DeMarle wrote:
> Each polygon in your data file has only two points. They need 3 or
> more coplanar points and must not be concave for VTK to work with
> them. Also, the last polygon references point id 3, which doesn't
> exist.
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
>
>
> On Tue, Jul 31, 2012 at 6:14 PM, Sanket Jain <jainsanket1 at gmail.com> wrote:
>> Hello Members,
>>
>> I created a sample vtk file to visualize a curve in Paraview. It reads in
>> without any errors but nothing comes on the viewer. Can someone point in the
>> right direction to fix this?
>>
>> Sanket
>>
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> _______________________________________________
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>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>
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