[vtkusers] vtkImageData: How to set the scalar pointer

[Mathieu Malaterre]

Steve,

	You may have a look at vtkImageImport:

http://www.vtk.org/doc/nightly/html/classvtkImageImport.html

	Or else,

usarray = vtkUnsignedShortArray::New( );
usarray->SetNumberOfComponents( 1 );
usarray->SetArray( ( ushort* )( my_c_array ), size, 1 );

//Pay attention in particular to the last param of SetArray:
//http://www.vtk.org/doc/nightly/html/classvtkUnsignedShortArray.html#z798_0

vtk = vtkImageData::New();
vtk->SetDimensions( blabla );
vtk->SetSpacing( blabla );
vtk->SetScalarType( VTK_UNSIGNED_SHORT );
vtk->GetPointData( )->SetScalars( usarray );
usarray->Delete( );

HTH
mathieu

Steve Boyd wrote:
> Hi,
> 
> How can I modify the pointer to the scalar data in vtkImageData?  In a
> reader class I'm working on, the image data is already in memory (from a
> C function).  Previously, I've been allocating memory in my vtkImageData
> class and then copying to that allocated memory, but this requires two
> copies of the image data in memory at the same time.  Can't I just set
> the vtkImageData pointer to point at the data already in memory (taking
> care to set extents, dim, etc)?
> 
> I want to do something like this:
> 
>   vtkImageData *data = this->GetOutput();
>   data->SetScalarTypeToChar();
>   data->SetDimensions(10,10,10);
>   data->SetScalarPointer( *mydata );		// SetScalarPointer() does not
> exist
> 
>   WHERE: mydata is an array of 1000 char.
> 
> I know there is a function to "GetScalarPointer()", but can't figure out
> how to modify the pointer.
> 
> HELP Please!
> 
> Cheers,
> 
> Steve
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Mathieu Malaterre
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