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

[David Gobbi]

Hi Sebastian,

Your first email said that the error is coming from vtkOpenGLTexture.
Are you using vtkTexture anywhere in your code?  Or maybe the
vtkTextMapper, which uses vtkTexture for rendering text?  You can
test by temporarily removing all actors from your program that display
tex to see if this stops the error.  The vtkImageResliceMapper itself
does not use vtkOpenGLTexture, so it cannot be the source of the error.

 - David


On Sat, Oct 11, 2014 at 6:42 PM, Sebastian Ordas
<sebastian.ordas at gmail.com> wrote:
> thank you, but it is still throwing the same error
> this is killing me ...
>
> I will keep trying
>
> best regards,
> sebastian
>
>
> On 10/10/2014 02:32 p.m., Cory Quammen wrote:
>>
>> 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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>
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