[vtkusers] VTK6 migration and vtkImageData: "No scalar values found for texture input!" error in vtkOpenGLTexture

[Cory Quammen]

Sebastian,

Perhaps in your problem code, you could invoke one of the
SetInputArrayToProcess() variants on your vtkImageResliceMapper:

http://www.vtk.org/doc/nightly/html/classvtkAlgorithm.html#a6bea16e1329609dbccce0ff8d2367484

I believe the name of the scalars in the output of
itkImageToVTKImageFilter is "scalars".

Cory

On Tue, Sep 30, 2014 at 5:02 PM, Sebastian Ordas
<sebastian.ordas at gmail.com> wrote:
> Hi Cory,
>
> I set up an example code, but I could not reproduce the error :-(
> The example is attached anyway, in case someone wants to have a look at it
>
> I will keep searching the source of the error in my application and will
> come back to the list with any finding
>
> thank you!
> sebastian
>
>
> On 29/09/2014 12:32 p.m., Cory Quammen wrote:
>>
>> Sebastian,
>>
>> Could you post a small, working example program that demonstrates the
>> problem?
>>
>> Thank you,
>> Cory
>>
>> On Mon, Sep 29, 2014 at 11:25 AM, Sebastian Ordas
>> <sebastian.ordas at gmail.com> wrote:
>>>
>>> Dear List,
>>>
>>> (I just realized I sent my message to ITK list instead of VTK!)
>>>
>>> I have started getting the error "No scalar values found for texture
>>> input!"
>>> coming from vtkOpenGLTexture, while porting my code to VTK6
>>>
>>> More precisely, I have a vtkImageData, generated by
>>> itkImageToVTKImageFilter, which is mapped through vtkImageResliceMapper
>>>
>>> I have tried adding the following to itkImageToVTKImageFilter:
>>>
>>>    m_Importer->UpdateInformation();
>>>    vtkStreamingDemandDrivenPipeline::SetUpdateExtent(
>>>          m_Importer->GetOutputInformation(0 /*port number*/),
>>>          0 /*piece*/,
>>>          2 /*number of pieces*/,
>>>          0 /*number of ghost levels*/);
>>>    m_Importer->Update();
>>>
>>> .. but no luck!
>>>
>>> I have also tried:
>>>
>>> m_ImageData->GetPointData()->SetActiveAttribute (0,
>>> vtkPointData::SCALARS);
>>>
>>> didn´t work either...
>>>
>>> Any hint?
>>>
>>> thank you,
>>> sebastian
>>>
>>>
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