[vtkusers] Linear/Nearest Neighbour interpolation of vtkPointData

[Shashwath T.R.]

Hmm, the documentation doesn't mention the interpolation method at all...

In any case, this would be implemented in CPU anyway - vtkDataSetAttributes
runs only on the CPU. After all, this is the question of a few lookups and
multiplications, which really shouldn't show a difference on either the CPU
or the GPU at interaction speeds.

Regards,
Shash

On Tue, Jul 20, 2010 at 7:37 PM, Matt Clarkson
<clarkson at drc.ion.ucl.ac.uk>wrote:

> I agree.
>
> However, I was asking because the documentation says it should do it, (but
> I can't work out how), and if it's done in openGL it will be faster than if
> I do it on the CPU, and also, it should be fewer lines of code, if it has
> already been implemented.
>
> Thanks
>
> Matt
>
>
> ----- "Shashwath T.R." <trshash at gmail.com> wrote:
> > Why would you need a special method? Just snap your input point to the
> image grid, and pick up the value there...
> >
> > Regards,
> > Shash
> >
> >
> > On Tue, Jul 20, 2010 at 5:18 PM, Matt Clarkson <
> clarkson at drc.ion.ucl.ac.uk> wrote:
> >
>>
>> > Hi there,
>> >
>> > I'm following this example:
>> > http://www.vtk.org/Wiki/VTK/Examples/Images/PickingAPixel
>> >
>> > However, at the point:
>> this->PointData->InterpolatePoint( pd, 0, cell->PointIds, weights );
>>
>> how would I do NearestNeighbour interpolation? It currently appears to be linear?
>> >
>> > I have tried looking at the doxygen for vtkDataSetAttributes, and there is some mention of setting the interpolation but I don't understand what I'm meant to set on what. Please can any one help me?
>> >
>> > Many thanks in advance
>> >
>> > Matt
>>
>>
>> >
>> ------------------------------------------------------
>> > Matt Clarkson Ph.D.
>> > Senior Research Associate
>> > m.clarkson at ucl.ac.uk
>> >
>> > Centre For Medical Image Computing
>> > http://cmic.cs.ucl.ac.uk/
>> > Tel: 020 7679 0240
>> > Fax: 020 7679 0255
>> >
>> > Dementia Research Centre
>> > http://dementia.ion.ucl.ac.uk/
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