[vtkusers] How to use vtkCellDerivatives with unstructured grid image

[Dominik Szczerba]

I inferred the order from the code.

Dominik

On Fri, Jun 17, 2011 at 2:39 AM, Seth Gilchrist <seth at mech.ubc.ca> wrote:
> Hi Dominik,
> thanks for your reply, this makes sense and was along the lines of what I
> have been trying.  Can you tell me how you arrived at 0, and 1 for the
> fieldAssociation values?  Is that just the order of the  enumerator list
> located at:
>
> http://www.vtk.org/doc/nightly/html/classvtkDataObject.html#a54fdf8345a01c89e618feca3c10002b1
>
> Thanks,
> Seth
>
>
>
>
>
> On Wed, Jun 15, 2011 at 3:12 PM, Dominik Szczerba <dominik at itis.ethz.ch>
> wrote:
>>
>> I never used the filter (in such cases I recommend custom filters) but
>> may be able to clarify some confusion about SetInputArrayToProcess. It
>> just explicitly tells the filter which array and of which type to take
>> in case there are multiple ones:
>>
>>
>> http://www.vtk.org/doc/nightly/html/classvtkAlgorithm.html#a6bea16e1329609dbccce0ff8d2367484
>>
>> Typical use:
>>
>> SetInputArrayToProcess(0,0,0,0,"PointScalar");
>> SetInputArrayToProcess(0,0,0,1,"CellMarker");
>>
>> Good luck
>> Dominik
>>
>>
>> On Wed, Jun 15, 2011 at 8:25 PM, Seth Gilchrist <seth at mech.ubc.ca> wrote:
>> > Hello,
>> > Sorry to bump, but I'm still struggling with this and can't find any
>> > good help in my books or online.  I have the "VTK Users Guide" and
>> > "The Visualization Toolkit: An Object-Oriented Approach to 3-D
>> > Graphics," but neither of them is any help in this case.
>> >
>> > Can anybody help with this question?  Examples, hints, whatever you
>> > can do is really appreciated.
>> >
>> > Cheers,
>> > Seth
>> >
>> > Previous message:
>> > Hello,
>> > I have the unstructured grid image printed at end of this email, with
>> > two
>> > point data sets "Dispamcement" (vectors) and "Optimizer Value"
>> > (scalors).  I
>> > want to use vtkCellDerivatives to calculate the strain tensors from the
>> > "Displacement" point data.  I can't figure out how to input the data
>> > into
>> > vtkCellDerivatives.  I have tried:
>> >
>> > vtkCellDerivatives  *dCalc = vtkCellDerivatives::New();
>> > dCalc->
>> > SetTensorModeToComputeStrain();
>> > dCalc->SetInput( image->GetPointData()->GetArray("Displacement") );
>> > dCalc->Update();
>> >
>> > and
>> >
>> > vtkCellDerivatives  *dCalc = vtkCellDerivatives::New();
>> > dCalc->SetTensorModeToComputeStrain();
>> > dCalc->SetInput(image);
>> > dCalc->SetInputArrayToProcess( [uh...I get lost here, I've tried a lot
>> > of
>> > things]  );
>> > dCalc->Update();
>> >
>> > I either can't get it to compile, or the output of the filter is the
>> > same as
>> > the input.
>> >
>> > Can anybody point me in the right direction?
>> >
>> > Thanks,
>> > Seth
>> >
>> > The cells in the image are quadratic tets.
>> >
>> > image->Print( std::cout )...
>> >
>> > vtkUnstructuredGrid (0x10f1150)
>> >  Debug: Off
>> >  Modified Time: 268
>> >  Reference Count: 1
>> >  Registered Events: (none)
>> >  Source: (none)
>> >  Information: 0x10e6130
>> >  Data Released: False
>> >  Global Release Data: Off
>> >  UpdateTime: 269
>> >  Release Data: Off
>> >  UpdateExtent: Not Initialized
>> >  Update Number Of Pieces: 1
>> >  Update Piece: 0
>> >  Update Ghost Level: 0
>> >  MaximumNumberOfPieces: 1
>> >  RequestExactExtent: Off
>> >   Field Data:
>> >    Debug: Off
>> >    Modified Time: 252
>> >    Reference Count: 1
>> >    Registered Events: (none)
>> >    Number Of Arrays: 0
>> >    Number Of Components: 0
>> >    Number Of Tuples: 0
>> >  Number Of Points: 81
>> >  Number Of Cells: 30
>> >  Cell Data:
>> >    Debug: Off
>> >    Modified Time: 259
>> >    Reference Count: 1
>> >    Registered Events: (none)
>> >    Number Of Arrays: 0
>> >    Number Of Components: 0
>> >    Number Of Tuples: 0
>> >    Copy Tuple Flags: ( 1 1 1 1 1 0 1 )
>> >    Interpolate Flags: ( 1 1 1 1 1 0 0 )
>> >    Pass Through Flags: ( 1 1 1 1 1 1 1 )
>> >    Scalars: (none)
>> >    Vectors: (none)
>> >    Normals: (none)
>> >    TCoords: (none)
>> >    Tensors: (none)
>> >    GlobalIds: (none)
>> >    PedigreeIds: (none)
>> >  Point Data:
>> >    Debug: Off
>> >    Modified Time: 268
>> >    Reference Count: 1
>> >    Registered Events: (none)
>> >    Number Of Arrays: 2
>> >    Array 0 name = Displacement
>> >    Array 1 name = Optimizer Value
>> >    Number Of Components: 4
>> >    Number Of Tuples: 81
>> >    Copy Tuple Flags: ( 1 1 1 1 1 0 1 )
>> >    Interpolate Flags: ( 1 1 1 1 1 0 0 )
>> >    Pass Through Flags: ( 1 1 1 1 1 1 1 )
>> >    Scalars: (none)
>> >    Vectors: (none)
>> >    Normals: (none)
>> >    TCoords: (none)
>> >    Tensors: (none)
>> >    GlobalIds: (none)
>> >    PedigreeIds: (none)
>> >  Bounds:
>> >    Xmin,Xmax: (57.5, 67.3)
>> >    Ymin,Ymax: (45.7, 56.7)
>> >    Zmin,Zmax: (41.7, 59.1)
>> >  Compute Time: 283
>> >  Number Of Points: 81
>> >  Point Coordinates: 0x10e7890
>> >  Locator: 0
>> >  Number Of Pieces: 1
>> >  Piece: 0
>> >  Ghost Level: 0
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