[Paraview] Getting Z Boundaries Correct on Custom Reader

[Mike Jackson]

I tried setting the origin to 490 but then the Z Boundary was
490+490*1.2 which was not correct either.

 Now that I have an idea of what is going on I think I can make the
necessary changes to the source code.

Mike

On Tue, Jul 7, 2009 at 12:50 PM, Burlen<burlen.loring at gmail.com> wrote:
> In so far as I understand, the origin is the location of the lower left
> corner of the cell indexed at 0,0,0. You have requested extent 490-491, so
> bounds should be: 0.0+490*1.2 to 0.0+491*1.2 or 588 to 589.
>
>
> Mike Jackson wrote:
>>
>> I have a custom reader that I am updating and all is going well
>> (thanks to all for help earlier) but I am having a problem
>> understanding how some values are computed.
>>
>> When I load my data set and I look in the "Information" tab the X and
>> Y boundaries are correct but the z boundary is not correct. In fact it
>> is off by the z origin multiplied by the z spacing which I find odd
>> because the X & Y origins are correct. Even if I set a z origin to
>> Zero.
>>
>> Some output from my reader:
>>
>> MicronOriginVoi: 46979.1 48347.6
>> MicronSizeVoi: 1545.97 1731.28
>> CurrentScalingFactor: 0.207987 0.207987 1.2
>> PixelVOI: 0 7432 0 8322 490 491
>> PixelActual: 0 7440 0 8330 490 727
>> requestedExtent: 0 7432 0 8322 490 491
>>
>> And I setup the vtkImageData like this:
>> output->SetSpacing(this->CurrentScalingFactor);
>> output->SetOrigin(this->MicronOriginVoi[0], this->MicronOriginVoi[1], 0.0
>> );
>> output->SetScalarType(VTK_TYPE_UINT8);
>> output->SetExtent(requestedExtent);
>> output->SetNumberOfScalarComponents( 1 );
>> output->AllocateScalars();
>> output->GetPointData()->GetScalars()->SetName("RoboMet Voxels");
>> output->GetPointData()->SetActiveScalars("RoboMet Voxels");
>>
>> At this point the "Information" tab shows a Z Bounds of 588 to 589
>> (Delta 1.2). So the delta is correct but not the bounds. Also during
>> the RequestInformation method I have the following code:
>>
>> double origin[3] = { this->MicronOriginVoi[0], this->MicronOriginVoi[1],
>> 0.0  };
>> outInfo->Set( vtkDataObject::ORIGIN(), origin, 3 );
>>
>> I am not really sure what I am doing wrong at this point.
>>
>> _________________________________________________________
>> Mike Jackson                               mike.jackson at bluequartz.net
>> BlueQuartz Software                    www.bluequartz.net