[vtkusers] Reading vtk image files

[Amy Henderson]

At 02:50 PM 3/18/2003 +1100, Nerolie.Oakes at csiro.au wrote:

>I am attempting to read in an existing file in vtk format. I want to 
>convert it
>
>To my own format, and hence need to get the image dimensions etc.
>
>
>
>I've tried the following, but am not getting sensible results (ie not in 
>dataSet or imageData):
>
>
>
>vtkDataSetReader *Reader = vtkDataSetReader::New();
>
>             Reader->SetFileName(filename);
>
>             vtkDataSet *dataSet = (vtkDataSet*)vtkDataSet::New();
>
>             dataSet = Reader->GetOutput();
>
>             float *bounds = dataSet->GetBounds();
>
>also
>
>
>
>vtkStructuredPointsReader *Reader = vtkStructuredPointsReader::New();
>
>             Reader->SetFileName(filename);
>
>             vtkStructuredPoints *dataSet = vtkStructuredPoints::New();
>
>             dataSet = Reader->GetOutput();
>
>             vtkImageData *imageData = Reader->GetOutput();
>
>             float *bounds = dataSet->GetBounds();
>
>             int *dim = dataSet->GetDimensions();
>
>

You need to call Reader->Update(); before you try to get information from 
its output.

- Amy

>I realise I'm doing something fundamentally wrong, but I'm not sure what, 
>and I can't
>
>Seem to find an example that helps. Can anyone help? (Perhaps my 
>expectations are
>
>Wrong - for example, how should I extract the numbers 512 486 and 41 if 
>not from
>
>A call to GetDimensions?)
>
>
>
>
>
>The file in question has header
>
>
>
># vtk DataFile Version 2.0
>
>comments here
>
>BINARY
>
>DATASET STRUCTURED_POINTS
>
>DIMENSIONS 512 486 41
>
>ORIGIN 0 0 0
>
>SPACING 0.51 1.62 24.39
>
>POINT_DATA 10202112
>
>SCALARS scalars unsigned_short
>
>LOOKUP_TABLE default
>
>
>
>And I can read it in OK via a sample program (which however passes a
>
>vtkDataSetReader  object's output straight to  a vtkDataSetMapper, rather 
>than extracting values
>
>directly).
>
>
>
>Thanks in advance,
>
>Nerolie

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