[vtkusers] vtkProbFilter examples please

[gregthom]

After reading around the list, it seems vtkprobefilter can only do one type
of interpolation . Besides, it seems I need to convert my points into a data
type with CELL format. 
That means I am now concentrating on looking into vtkImageReslice to do my
job ? ie given a vtkImageData , obtain the scalar value of any given general
xi,yi,zi points .. has some one done this before ? or should interpolation
be done out of VTK ?





gregthom wrote:
> 
> Greetings
> 
> I have been reading the documentation for vtkProbeFilter and it seems it
> is exactly what I need but I am missing some concrete ideas as to how to
> use it.
> 
> I have some 3D vtkImageDatas with scalar (unsigned short and floats)
> attributes. I have the dimensions and spacings of my vtkImageDatas.
> 
> Question1: 
> 
> Can someone with experience give me an idea as to how I can obtain the
> scalar values at a particular (x,y,z) coordinate ? with x,y,z not
> necessarily at grid position in vtkImageData ?
> This is somehow interpolation, (am I correct?). if so are there choices to
> be made to influence the "interpolated value" ie trilinear, nearest etc
> 
> Question 2: 
> Can someone explain how I can convert the vtkImageData into a grid of
> vtkHexahedron (cell type 12) with the condition that 
>  1) each hexahedron is centered on the center of voxels from the
> vtkImageData 
>  2) grid points are the 8 coner points of the voxels in the vtkImageData ?
> 
> From the documentation of vtkProbeFilter it seems it can achieve all of
> this but I need to start from some basic examples.
> 
> Hope someone can answer me
> 
> user
> 
> 
> 
> 
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