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vtkCellDerivatives for polytopal surface mesh

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vtkCellDerivatives for polytopal surface mesh

kayarre
Hi,
  Does anyone have suggestions to take cell derivatives from a  polyhedral/polytopal surface mesh because the VTK documentation says that, "derivatives calculated for polygons with more than 4 vertices are inaccurate in most cases"



Regards, 
~Kurt

--
Kurt Sansom

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Re: vtkCellDerivatives for polytopal surface mesh

Jeff Lee-2
Vtkpolyhedron uses mean value coordinates.

On May 8, 2017 1:13 PM, "Kurt Sansom" <[hidden email]> wrote:
Hi,
  Does anyone have suggestions to take cell derivatives from a  polyhedral/polytopal surface mesh because the VTK documentation says that, "derivatives calculated for polygons with more than 4 vertices are inaccurate in most cases"



Regards, 
~Kurt

--
Kurt Sansom

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Re: vtkCellDerivatives for polytopal surface mesh

kayarre
I do not understand your answer.

~Kurt

On Mon, May 8, 2017 at 10:26 AM, Jeff Lee <[hidden email]> wrote:
Vtkpolyhedron uses mean value coordinates.

On May 8, 2017 1:13 PM, "Kurt Sansom" <[hidden email]> wrote:
Hi,
  Does anyone have suggestions to take cell derivatives from a  polyhedral/polytopal surface mesh because the VTK documentation says that, "derivatives calculated for polygons with more than 4 vertices are inaccurate in most cases"



Regards, 
~Kurt

--
Kurt Sansom

_______________________________________________
Powered by www.kitware.com

Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html

Please keep messages on-topic and check the VTK FAQ at: http://www.vtk.org/Wiki/VTK_FAQ

Search the list archives at: http://markmail.org/search/?q=vtkusers

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--
Kurt Sansom

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Re: vtkCellDerivatives for polytopal surface mesh

Jeff Lee-2
Hi,
A polyhedron could be treated as a closed polygonal surface (or conversely a closed polygonal surface could be considered an arbitrary polyhedron).  If you look at vtkPolyhedron.cxx you can see how it is using MeanValueCoordinates to interpolate the function values inside the cell, and then compute the derivatives.  So if your mesh contains polyhedral cells, vtkCellDerivatives should work.

On Mon, May 8, 2017 at 5:38 PM, Kurt Sansom <[hidden email]> wrote:
I do not understand your answer.

~Kurt

On Mon, May 8, 2017 at 10:26 AM, Jeff Lee <[hidden email]> wrote:
Vtkpolyhedron uses mean value coordinates.

On May 8, 2017 1:13 PM, "Kurt Sansom" <[hidden email]> wrote:
Hi,
  Does anyone have suggestions to take cell derivatives from a  polyhedral/polytopal surface mesh because the VTK documentation says that, "derivatives calculated for polygons with more than 4 vertices are inaccurate in most cases"



Regards, 
~Kurt

--
Kurt Sansom

_______________________________________________
Powered by www.kitware.com

Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html

Please keep messages on-topic and check the VTK FAQ at: http://www.vtk.org/Wiki/VTK_FAQ

Search the list archives at: http://markmail.org/search/?q=vtkusers

Follow this link to subscribe/unsubscribe:
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--
Kurt Sansom


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