Dr Gerard Gorman wrote:
> On Wed, 2007-11-14 at 16:37 +0530, Prabhu Ramachandran wrote:
>> 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.
Yes, I know. But that is what the implementation seems to do. It
should be possible to submit a patch to add what you suggest to the
filter... :-)
cheers,
prabhu
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