[vtkusers] bilinear, trilinear interpolation..

[K. R. Subramanian]

David Gobbi wrote:

> I just remembered another method for interpolation: you can
> use vtkImplicitDataSet or vtkImplicitVolume to convert the
> data into a function.

Aha!  This perhaps will serve my purpose. So I can set the volume with the
SetVolume (vtkImageData*) call and then query the volume at any point (x,y,z)
and it internally interpolates for non-lattice locations, right?

Will it just do linear interpolation? I remember in an earlier email that cubic
was supported (perhaps for some other classes?)

Thanks, it amazes there is so much response on weekends -:) ?

    -- krs

>
>
>  - David
>
> On Sat, 30 Jun 2001, Will Schroeder wrote:
>
> > The cells vtkPixel and vtkVoxel do interpolation. There are more general
> > forms of these cells that do something similar, although less efficiently:
> > vtkQuad and vtkHexahedron. Using EvaluatePosition() and EvaluateLocation
> > you can go back and forth between parametric and world space. Also, there
> > is a static function InterpolationFunctions that can be used (given a
> > parametric coordinate pcoord[3], return the interpolation weights).
> >
> > Will
> >
> >
> >
> >
> > William J. Schroeder, Ph.D.
> > Kitware, Inc.
> > VTK-Based Visualization Solutions
> > 469 Clifton Corporate Parkway
> > Clifton Park, NY 12065 USA
> > will.schroeder at kitware.com
> > http://www.kitware.com
> > 1-518-371-3971 x102
> >
> >
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--
Dr. K.R.Subramanian                           Phone: (301) 402-0042
National Institutes of Health                 FAX:   (301) 402-4080
National Library of Medicine                  Email: krs at cs.uncc.edu
Bldg 38A, Rm. B1N30D                          WWW: www.cs.uncc.edu/~krs
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