Hi
On Wed, 2007-11-14 at 16:37 +0530, Prabhu Ramachandran wrote:
> Thats the information available in the VTK class. The implementation is
> here:
>
> http://public.kitware.com/cgi-bin/cvsweb.cgi/VTK/Graphics/vtkCellDataToPointData.cxx
>
> Basically, they find all the cells that share particular point. Then the
> value at the point is the average of the values at the cells that share
> the point. The weights are the same for all cells.
>
Eek - that doesn't look right. They should be using a finite element
type projection method. ie - it should be something like (I hope you
read latex)
\begin{equation}
field_n = (sum_e^{elements surrounding node n} field_e*volume_e)/
(sum_e^{elements surrounding node n}volume_e)
\end{equation}
I'm using "element" and "cell" interchangeably here. If you don't do
this then the result will be very inaccurate for inhomogeneous meshes.
Cheers
g
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