[vtkusers] imagedata appearing upside down (sometimes..?)

[Howard Katz]

Also,
just note that I input data using:

VelocityVsTimeSampleFloatArray->SetVoidArray(array,TotalTimePoints*TotalCycles*NumBins, 
1 );

where array is a 1D float array whcih represents a 2D array through 
subscirpt arithemtic by doing:

array [ row*TotalColumns + col ] = value;

Thanks..!
Howard

>From: "Howard Katz" <lost_bits1110 at hotmail.com>
>To: mathieu.malaterre at kitware.com
>CC: vtkusers at vtk.org
>Subject: Re: [vtkusers] imagedata appearing upside down (sometimes..?)
>Date: Mon, 22 Mar 2004 23:11:20 +0000
>
>Hi,
>
>I called GetSpacing and it returns (1,1,1) just as I had specified..
>And I know the input values are correct i.e they're not negative or 
>anything because I also outputted this..
>And I noticed that whenever I don't add a camera to my renderer, nothing 
>happens when I change the spacing, is this normal?
>Okay below is some C++ code,
>So again its werid because the whole thing appears upside down only for 
>some cases and not others..?
>Anyways here it is:
>
>VelocityVsTimeSampleFloatArray->SetNumberOfComponents(1);
>VelocityVsTimeSampleFloatArray->SetNumberOfTuples(TotalCycles*NumVelocityBins*TotalTimePoints 
>);
>VelocityVsTimeSampleImageData->SetOrigin(-30, -85, 0);
>	VelocityVsTimeSampleImageData->GetPointData()->SetScalars(VelocityVsTimeSampleFloatArray);
>VelocityVsTimeSampleImageData->SetDimensions(TotalCycles*TotalTimePoints,NumVelocityBins, 
>1);
>VelocityVsTimeSampleImageData->SetScalarType(VTK_FLOAT);
>VelocityVsTimeSampleImageData->SetSpacing(1, 1, 1);
>
>ImageCast->SetInput( VelocityVsTimeSampleImageData);
>ImageCast->SetOutputScalarTypeToUnsignedChar();
>
>ImageMapToColors->SetInput(ImageCast->GetOutput());
>ImageMapToColors->SetLookupTable(SpectLUT);
>
>SpectActor->SetInput(ImageMapToColors->GetOutput());
>SpectActor->SetDisplayExtent( 0, TotalCycles*TotalTimePoints-1, 0, 
>NumVelocityBins-1, 0, 0 );
>
>Cam->SetPosition(0, 0, 325);
>Cam->SetFocalPoint(0,0,0);
>
>Ren1->SetBackground(0.3, 0.3, 0.3);
>Ren1->SetActiveCamera(Cam);
>Ren1->AddActor( SpectActor );
>
>RenWin->AddRenderer( Ren1 );
>RenWin->SetSize( 500, 500 );
>RenWin->SetInteractor(Iren);
>Iren->SetStillUpdateRate(1000);
>Iren->SetDesiredUpdateRate(1000);
>Iren->Initialize();
>Iren->Render();
>
>
>
>
>>From: Mathieu Malaterre <mathieu.malaterre at kitware.com>
>>To: Howard Katz <lost_bits1110 at hotmail.com>
>>CC: vtkusers at vtk.org
>>Subject: Re: [vtkusers] imagedata appearing upside down (sometimes..?)
>>Date: Mon, 22 Mar 2004 17:34:30 -0500
>>
>>Howard,
>>
>>	What does :
>>
>>//Call Update() before
>>print imagedata.GetSpacing()
>>
>>return ?
>>Could you reproduce the bad behavior using a tests from VTK ? Or could you 
>>send us a python/c++/tcl code that shows this problem.
>>
>>Thanks
>>Mathieu
>>
>>Howard Katz wrote:
>>>Hi..
>>>What do you mean my spacing 'can' be negative...?
>>>:S
>>>Thanks again..!
>>>
>>>
>>>
>>>>From: Mathieu Malaterre <mathieu.malaterre at kitware.com>
>>>>To: Howard Katz <lost_bits1110 at hotmail.com>
>>>>CC: vtkusers at vtk.org
>>>>Subject: Re: [vtkusers] imagedata appearing upside down (sometimes..?)
>>>>Date: Mon, 22 Mar 2004 13:13:18 -0500
>>>>
>>>>Howard Katz wrote:
>>>>
>>>>>Hi,
>>>>>so has anyone run into the problem where their vtkImageData looks 
>>>>>upside down only sometiems depending on the input values..?  i.e. I 
>>>>>know I am inputting values 10, 20, 15 (for example) but these appear at 
>>>>>rows -10, -20, -15  (..and this will happen for the entire image data)
>>>>>
>>>>>Can anyoen guess what my problem might be?
>>>>
>>>>
>>>>You spacing can be negative, this happens typically in medical image 
>>>>data such a MINC or DICOM
>>>>
>>>>HTH
>>>>Mathieu
>>>>
>>>>
>>>
>>>_________________________________________________________________
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>>>ESPN. http://msn.espn.go.com/index.html?partnersite=espn
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>>>
>>
>>
>>
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