[vtkusers] vtlVolumeReader

[William Oliver]

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I missed the first part of this discussion, so if someone has
already said this, I apologize.

There is a routine for reading 3D data in one file: vtkImageReader.

I had this question some months ago for reading raw 3D MRI data, and
someone was nice enough to answer it.  For me to read a 256x256x256 dataset
without a header, the code is (for Tcl):

vtkImageReader reader
     reader SetFileName "/home/oliver/data/tst.dat"
     reader DebugOn
     reader SetFileDimensionality 3
     reader SetDataExtent 0 255 0 255 0 255
     reader SetDataOrigin 0 0 0
     reader SetDataScalarTypeToUnsignedShort
     reader SetDataMask 0x7fff
     reader SetDataSpacing 1 1 1
     reader SetDataByteOrderToBigEndian
     reader SeadHeaderSize 0



then, when you get ready to render:


vtkVolumeRayCastMapper volumeMapper
     ...[stuff]
     volumeMapper SetInput [reader GetOutput]
     ...[stuff]




It works great for me.



William R Oliver, MD

For PGP public key, send email to oliver at afip.org


On Wed, 10 Apr 2002, Thomas Deschamps wrote:

> Hi,
>
> I still do not understand why there is no routine to read volumetric
> images contained in a single file?
> 3D datasets in slices in not so common. Ok, DICOM is often sliced, but
> there are frequently datasets contained in an unique file. It is often
> more convenient, especially for practical reasons (copying and
> transmission for example, compactness also).
> Does anyone try to incorporate it into vtk?
> Is it not more interesting to have a vtkVolumeReader class which is more
> general, thus allowing sliced and self-contained datasets?
> Maybe I did not notice that it exists somewhere. But I always use
> vtkImageReader + vtkImageToStructuredPoints.
>
> Thomas Deschamps
> TDeschamps at lbl.gov
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