[vtkusers] Re: vtkExtractVOI in 3D

[Thomas Deschamps]

Something I forgot to mention: I am using vtkStructuredPoints datasets 
and not vtkImageData.

Thomas (TDeschamps at lbl.gov)

Thomas Deschamps wrote:

> I obtained exactly the same wrong result with vtkImageClip.
> Please help!
>
> Thomas (TDeschamps at lbl.gov)
>
> Thomas Deschamps wrote:
>
>> HI vtkUsers,
>>
>> Does someone notice any problem using vtkExtractVOI on 3d 
>> vtkStructuredPoints datasets?
>> It seems the 3d image obtained with the following code has problems.
>>
>>            int extent[6];
>>            imageData -> GetExtent(extent);
>>            extent[0] = 10;
>>
>>            vtkExtractVOI * tmpVOI = vtkExtractVOI::New();
>>            tmpVOI -> SetInput(imageData);             tmpVOI -> 
>> SetVOI(extent);
>>            tmpVOI -> Update();
>>
>>            imageData -> DeepCopy();
>>
>> The resulting image is weird: it is shifted in the x direction by 
>> extent[0] = 10, and the data between 0 and extent[0] is replaced by 
>> zeros, and lots of others strange behaviors (The geometry of the 
>> image is lost).
>> The strange part is I did not change my code for a long time, that is 
>> why I suspect my yesterday checked out cvs version of vtk to be 
>> responsible. But as usual there is probably something I forgot to do.
>> Does anyone have an idea? 
>