[vtkusers] Scalar type changing unexpectedly in

[jmerkow]

Hello,

I am working on a project that utilizes vtk extensively. For one of the
functions I need to change the origin and spacing, to do this I am using the
vtkChangeInformation class.  My problem is that this filter is producing a
an image that has a different scalar type then the input.  I have tried to
change it using SetScalarType but its not working.  The input scalar type to
the filter is short, but its outputting double.

cvStrPts is basically a wrapper class for vtkstructuredpoints.

static void myclass::vtkSetInfo2Reference(vtkStructuredPoints* in)
{
	if(Self::Debug)
		std::cout << "vtkSetInfo2Reference: in " << in->GetScalarTypeAsString()
<<std::endl;

	vtkStructuredPoints* temp = vtkStructuredPoints::New();
	temp->SetScalarType(in->GetScalarType(),in->GetInformation());
	temp->DeepCopy(in);
	if(Self::Debug)
			std::cout << "vtkSetInfo2Reference: temp " <<
temp->GetScalarTypeAsString() <<std::endl;

	vtkSmartPointer<vtkImageChangeInformation> changer =
			vtkSmartPointer<vtkImageChangeInformation>::New();

	changer->SetInputData(temp);
	changer->SetOutputOrigin(Self::Origin);
	changer->SetOutputSpacing(Self::Spacing);

	in->DeepCopy(changer->GetOutput());
	in->SetScalarType(temp->GetScalarType(),temp->GetInformation());

	if(Self::Debug)
		std::cout << "vtkSetInfo2Reference: " << in->GetScalarTypeAsString()
<<std::endl;

	temp->Delete();
}


using this function outputs:
vtkSetInfo2Reference: in short
vtkSetInfo2Reference: temp short
vtkSetInfo2Reference: double
SetFeatureImage s after reference: double


Any idea why the scalar type is being changed by the ChangeInformation
filter? and why Its not being set back? I assume I can solve this with a
vtkImageCast filter, but I don't understand why changeInformation would
modify the scalar type.

Jameson




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