[vtkusers] VTK C++ : How to perform a velocity interpolation computation from a vtkMultiBlockDataSet with celldata?

[Biddiscombe, John A.]

reader->vtkCellDataToPointData->vtkProbeFilter
if the original data contains a vector field, then just use the probefilter.

this is expensive because the entire dataset is interpolated to cell nodes and then a bilinear interpolation is used in the probefilter. But it is very simple.
To use the other classes you refer to would require much more in depth knowledge of the classes/uses.

JB


-----Original Message-----
From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On Behalf Of Guillaume Jacquenot
Sent: 19 January 2012 14:48
To: vtkusers at vtk.org
Subject: Re: [vtkusers] VTK C++ : How to perform a velocity interpolation computation from a vtkMultiBlockDataSet with celldata?

Well I am not familiar with programming with VTK framework.

My objective is to use velocity vector data contained at cell centers in a vtkMultiBlockDataSet to build an instance of vtkInterpolateVelocityField, and make request on that object to retrieve interpolated velocity vector from user input point.

I came to the conclusion that I need first to transfer my cell-centered data to point data with vtkCellDataToPointData, and pass the result to vtkInterpolateVelocityField, but I don't know how to proceed.

I don't know how to explain my request at a "filter-like level".

All the examples I have looked at used the method GetOutputPort to export the result of vtkCellDataToPointData to another vtkAlgorithm, but vtkInterpolateVelocityField does not derived from a vtkAlgorithm.

I am looking for any hint to help me with this.

Best regards

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