[vtkusers] CT image scalars

[Lisa Avila]

Hello Chi,

You need to do a

v16->Update();

before you can get the output (otherwise the output is empty as you have 
determined)

Lisa


At 11:25 AM 9/30/2003, X. Chi wrote:
>Hi, all
>
>I have a question on CT image scalars. I was trying to get the scalars 
>from image data once I read it in my program. The following is the code:
>
>vtkVolume16Reader *v16 = vtkVolume16Reader::New();
>
>    v16->SetDataDimensions (64,64);
>    v16->SetImageRange (1,93);
>    v16->SetDataByteOrderToLittleEndian();
>    v16->SetFilePrefix ("headsq/quarter");
>    v16->SetDataSpacing (3.2, 3.2, 1.5);
>
>vtkImageData *id = vtkImageData::New();
>id=v16->GetOutput();
>for(int i=0; i<64; i++)
>for(int j=0; j<64; j++)
>printf("show scalars:%f\n", id->GetScalarComponentAsFloat(j, i, 32, 0));
>
>
>After the testing, the program printed out all the scalars are zero.
>
>Could anybody tell me what the problem is? Thank you for your help.
>
>Chi
>
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