[Paraview-developers] [Paraview] vtkImageData Plugin, vtkImageData not rendered

Mon Jan 16 03:12:18 EST 2017

Hi

I uploaded a cleaned version of the reader without gui component to https://expirebox.com/download/b5db956fb2b0787ac16ef9b42e46698a.html (again 48h available). The GUI has included a timer which polls on the HasNewData() function and if it returns true it forces an update of the request data function.  I copied that workflow of the PCLPlugin of Paraview of the Kinect OpenNI Source….. the commented code also displays the *.vti writing....

Best regards,
Gerald
Von: Joachim Pouderoux [mailto:joachim.pouderoux at kitware.com] 
Gesendet: Freitag, 13. Jänner 2017 15:45
An: Lodron, Gerald
Cc: Paraview Developer (Paraview-developers at paraview.org); Paraview User (paraview at paraview.org)
Betreff: Re: [Paraview-developers] [Paraview] vtkImageData Plugin, vtkImageData not rendered

Could you share the code of your reader? If you prefer you can remove all specific stuff and keep only VTK related stuff.
I would like to see how exactly you fetch the output grid to fill and how your filter defines its output.
Best,

Joachim Pouderoux, PhD
Technical Expert - Scientific Computing Team
Kitware SAS

2017-01-13 3:17 GMT-04:00 Lodron, Gerald <Gerald.Lodron at joanneum.at>:
Nope, the data is then nearly empty (<1kByte), hiere the vti writer output:

<VTKFile type="ImageData" version="1.0" byte_order="LittleEndian" header_type="UInt64">
  <ImageData WholeExtent="0 -1 0 -1 0 -1" Origin="0 0 0" Spacing="1 1 1">
    <Piece Extent="0 -1 0 -1 0 -1"                                                    >
      <PointData Scalars="21745593">
        <DataArray type="UInt8" Name="21745593" format="appended" RangeMin="1e+299"               RangeMax="-1e+299"              offset="0"                   />
      </PointData>
      <CellData>
      </CellData>
    </Piece>
  </ImageData>
  <AppendedData encoding="raw">
   _
  </AppendedData>
</VTKFile>

Here the mhd header which I usually prefer, the “DimSize” is 0,0,0:
ObjectType = Image
NDims = 3
BinaryData = True
BinaryDataByteOrderMSB = False
CompressedData = True
TransformMatrix = 1 0 0 0 1 0 0 0 1
Offset = 0 0 0
CenterOfRotation = 0 0 0
ElementSpacing = 1 1 1
DimSize = 0 0 0
AnatomicalOrientation = ???
ElementType = MET_UCHAR
ElementDataFile = test.zraw

Von: Joachim Pouderoux [mailto:joachim.pouderoux at kitware.com]
Gesendet: Donnerstag, 12. Jänner 2017 22:28
An: Lodron, Gerald
Cc: Paraview Developer (Paraview-developers at paraview.org); Paraview User (paraview at paraview.org)
Betreff: Re: [Paraview-developers] [Paraview] vtkImageData Plugin, vtkImageData not rendered

OK. That's weired, your VTI is correct.
And what if you save the output of your filter/reader with ParaView "Save Data"? Is data correctly saved and reloaded correctly?
Joachim

Joachim Pouderoux, PhD
Technical Expert - Scientific Computing Team
Kitware SAS

2017-01-11 8:14 GMT-04:00 Lodron, Gerald <Gerald.Lodron at joanneum.at>:
i have uploaded the vti onto
https://expirebox.com/download/60e7c1e8d177f282ae90d42f75e5ae50.html
the link is 48h accessible

when I load the vti into paraview everything is visualized correctly

Von: Paraview-developers [mailto:paraview-developers-bounces at paraview.org] Im Auftrag von Lodron, Gerald
Gesendet: Mittwoch, 11. Jänner 2017 12:07

An: Joachim Pouderoux
Cc: Paraview Developer (Paraview-developers at paraview.org); Paraview User (paraview at paraview.org)
Betreff: Re: [Paraview-developers] [Paraview] vtkImageData Plugin, vtkImageData not rendered

Sorry for my late reply:

“21745593” is correct, that’s the UID string of the sensor/camera which generates the vtkImagedata, I set the string from its SDK…. I will try writing the vti file for you….

Von: Joachim Pouderoux [mailto:joachim.pouderoux at kitware.com]
Gesendet: Dienstag, 10. Jänner 2017 19:09
An: Lodron, Gerald
Cc: Paraview Developer (Paraview-developers at paraview.org); Paraview User (paraview at paraview.org)
Betreff: Re: [Paraview-developers] [Paraview] vtkImageData Plugin, vtkImageData not rendered

Hmm sorry if I had took a closer look I would have seen that AllocateScalars set a default name "ImageScalars" to the scalar array.
Then don't know what you did but the print says that the name of your array is "21745593" which is quite strange. Is it what you did?
Could you write your "output" image data to a .VTI file using a vtkXMLImageDataWriter after initializing it in your RequestData
function and see if you can load in with PV and view it? Share it if you can't.
Best,

Joachim Pouderoux, PhD
Technical Expert - Scientific Computing Team
Kitware SAS

2017-01-10 2:00 GMT-04:00 Lodron, Gerald <Gerald.Lodron at joanneum.at>:
Here i printed my vtkImageDataOutput of my plugin in  Request data, may that helps…:

output vtkImageData (00000087ABEB1260)
Debug: Off
Modified Time: 870183
Reference Count: 1
Registered Events: (none)
Information: 00000087AC049A90
Data Released: False
Global Release Data: Off
UpdateTime: 195896
Field Data:
Debug: Off
Modified Time: 870094
Reference Count: 1
Registered Events: (none)
Number Of Arrays: 0
Number Of Components: 0
Number Of Tuples: 0
Number Of Points: 1920000
Number Of Cells: 1917201
Cell Data:
Debug: Off
Modified Time: 870179
Reference Count: 1
Registered Events:
Registered Observers:
vtkObserver (00000087ABC476A0)
Event: 33
EventName: ModifiedEvent
Command: 00000087AC0495E0
Priority: 0
Tag: 1
Number Of Arrays: 0
Number Of Components: 0
Number Of Tuples: 0
Copy Tuple Flags: ( 1 1 1 1 1 0 1 1 )
Interpolate Flags: ( 1 1 1 1 1 0 0 1 )
Pass Through Flags: ( 1 1 1 1 1 1 1 1 )
Scalars: (none)
Vectors: (none)
Normals: (none)
TCoords: (none)
Tensors: (none)
GlobalIds: (none)
PedigreeIds: (none)
EdgeFlag: (none)
Point Data:
Debug: Off
Modified Time: 870183
Reference Count: 1
Registered Events:
Registered Observers:
vtkObserver (00000087ABC475B0)
Event: 33
EventName: ModifiedEvent
Command: 00000087AC0495E0
Priority: 0
Tag: 1
Number Of Arrays: 1
Array 0 name = 21745593
Number Of Components: 1
Number Of Tuples: 1920000
Copy Tuple Flags: ( 1 1 1 1 1 0 1 1 )
Interpolate Flags: ( 1 1 1 1 1 0 0 1 )
Pass Through Flags: ( 1 1 1 1 1 1 1 1 )
Scalars:
Debug: Off
Modified Time: 870148
Reference Count: 2
Registered Events: (none)
Name: 21745593
Data type: unsigned char
Size: 1920000
MaxId: 1919999
NumberOfComponents: 1
Information: 0000000000000000
Name: 21745593
Number Of Components: 1
Number Of Tuples: 1920000
Size: 1920000
MaxId: 1919999
LookupTable: (none)
Vectors: (none)
Normals: (none)
TCoords: (none)
Tensors: (none)
GlobalIds: (none)
PedigreeIds: (none)
EdgeFlag: (none)
Bounds:
Xmin,Xmax: (0, 1599)
Ymin,Ymax: (0, 1199)
Zmin,Zmax: (0, 0)
Compute Time: 870184
Spacing: (1, 1, 1)
Origin: (0, 0, 0)
Dimensions: (1600, 1200, 1)
Increments: (0, 0, 0)
Extent: (0, 1599, 0, 1199, 0, 0)

Von: Paraview-developers [mailto:paraview-developers-bounces at paraview.org] Im Auftrag von Lodron, Gerald
Gesendet: Dienstag, 10. Jänner 2017 06:49
An: Joachim Pouderoux
Cc: Paraview Developer (Paraview-developers at paraview.org); Paraview User (paraview at paraview.org)
Betreff: Re: [Paraview-developers] [Paraview] vtkImageData Plugin, vtkImageData not rendered

Hi

Good try but does not effect anything except the string in paraview’s combo box. The strange thing is that I also cannot see anything in spreadsheet view (empty cell and point data)… but on information tab point data and cell data is there….

Von: Joachim Pouderoux [mailto:joachim.pouderoux at kitware.com]
Gesendet: Montag, 09. Jänner 2017 19:40
An: Lodron, Gerald
Cc: Paraview User (paraview at paraview.org); Paraview Developer (Paraview-developers at paraview.org)
Betreff: Re: [Paraview] vtkImageData Plugin, vtkImageData not rendered

Hi Gerald,
Not sure it is the only issue but please try giving a name to the output scalar arrays.
ParaView won't make visible arrays which don't have a name.
Example:
  output->GetPointData()->GetScalars()->SetName("values");
Best,

Joachim Pouderoux, PhD
Technical Expert - Scientific Computing Team
Kitware SAS

2017-01-09 5:20 GMT-04:00 Lodron, Gerald <Gerald.Lodron at joanneum.at>:
Hi

I programmed successfully a plugin source wich generates a vtkImageData output and made it the same way as on my 3d cloud plugins of vtkPolyData. The source is inherited from vtkImageAlgorithm and only contains one output with unsigned char array and one component.

In the request data function of the filter I currently have a very dummy:

output->SetDimensions(oData.imgSizeX, oData.imgSizeY, 1);
output ->AllocateScalars(VTK_UNSIGNED_CHAR, 1);
 memcpy(output ->GetScalarPointer(), &oData.imgData[0], oData.imgSizeX* oData.imgSizeY*sizeof(unsigned char));

in paraview I see in the information tab that  I have an uniform rectilinear grid with 1917201 cells and 1920000 points (image is 1600*1200px). In data Arrays I get an "ImageScalars" of unsigned char and a correct range of my memcopy data (my min max range is not 0,255 so data seems to be there)...

the problem is that I cannot see anything in the render view, any suggestions what I am making wrong? I tested all representation (slice, surface, outline, on Solid Color and on my array), never see anything.....

I also compared the Information tab on a loaded jpeg image and cannot see any difference (which is rendered in render view except the Array's string name), by the way: can I disable "MapScalars" by default?

I am using pv5.2

------------------------------------------------------------------------------------
Gerald Lodron

Researcher of Machine Vision Applications Group
DIGITAL - Institute for Information and Communication Technologies

JOANNEUM RESEARCH Forschungsgesellschaft mbH
Steyrergasse 17, 8010 Graz, AUSTRIA

phone:   +43-316-876-1751   
general fax: +43-316-876-1751
web: http://www.joanneum.at/digital
e-mail: gerald.lodron at joanneum.at

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