[vtk-developers] [VTK 0013338]: Algorithm for polygon faceting for polyhedral finite elements

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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http://paraview.org/Bug/view.php?id=13338 
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Reported By:                Samuel Key
Assigned To:                
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Project:                    VTK
Issue ID:                   13338
Category:                   (No Category)
Reproducibility:            have not tried
Severity:                   minor
Priority:                   normal
Status:                     backlog
Project:                    TBD 
Type:                       incorrect functionality 
Resolution:                 open
Fixed in Version:           
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Date Submitted:             2012-08-01 17:27 EDT
Last Modified:              2012-08-01 17:27 EDT
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Summary:                    Algorithm for polygon faceting for polyhedral finite
elements
Description: 
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
(Sandia contractor)
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Issue History 
Date Modified    Username       Field                    Change               
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2012-08-01 17:27 Samuel Key     New Issue                                    
2012-08-01 17:27 Samuel Key     File Added: ipt00-ipt04-talk.png                
   
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