[vtkusers] vtkImageData::SetOrigin didn't take effect

[David Doria]

On Tue, Mar 2, 2010 at 7:11 AM, michiel mentink <
michael.mentink at st-hughs.ox.ac.uk> wrote:

>
> try using imgdata->GetOrigin()
>
> cheers, Michael
>
> On Tue, Mar 2, 2010 at 10:03 AM, 王君臣 <wangjunchen at gmail.com> wrote:
>
>>
>> hi, all
>>
>> I just encountered a strange thing that when I set the origin of
>> vtkImageData, and read it out after the assignment, it turned out that the
>> value hasn't changed (hold the value before the assignment).
>>
>> =====code seg =======
>>
>>    vtkImageData * imgdata = vNode->GetImageData();
>>    double o[3];
>>    imgdata->GetOrigin(o); // o is [100, 100, 100]
>>    imgdata->SetOrigin(0, 0, 0); // assign origin to [0 0 0]
>>    imgdata->GetOrigin(o);// still [100 100 100]
>> ====================
>>
>> something I have to say is that the mehtod SetOrigin will trigger the
>> vtkcommand::modifiedevent of the imgdata and in the handler I re-rendered
>> the widget which contains the actor of the imgdata. imgdata is not connected
>> to the filter, thus there is no possibility that the filter updated the
>> imgdata.
>>
>> I need for your help, thanks.
>> --
>> Best Regards,
>> WANG Junchen
>>
>
This seems to behave as expected:

  vtkSmartPointer<vtkImageData> imgdata =
    vtkSmartPointer<vtkImageData>::New();
  double o[3];
  imgdata->GetOrigin(o);
  cout << o[0] << " " << o[1] << " " << o[2] << endl;

  double newO[3] = {100, 100, 100};
  imgdata->SetOrigin(newO);

  double modifiedO[3];
  imgdata->GetOrigin(modifiedO);
  cout << modifiedO[0] << " " << modifiedO[1] << " " << modifiedO[2] <<
endl;

Thanks,

David
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20100302/ce4dc499/attachment.htm>