[vtkusers] MultiblockDataSet SetBlock , Paraview Related

[RIVERA, Orlando]

Dear VTK Community,


I have a question about vtkMulitBlockDataSet and setting  blocks!


I have created, for example, the following empty structure:

+ vtkMultiBlockDataSet (root)
++ vtkMultiBlockDataSet (L1)
+++ vtkMultiBlockDataSet (A)
            ++++ vtkUnstructuredGrid (1)
            ++++ vtkUnstructuredGrid (2)

++ vtkMultiBlockDataSet (L2)
+++ vtkMultiBlockDataSet (B)
            ++++ vtkUnstructuredGrid (3)
            ++++ vtkUnstructuredGrid (4)

++ vtkMultiBlockDataSet (L3)
                        +++ vtkMultiBlockDataSet (C)
            ++++ vtkUnstructuredGrid (5)

+++ vtkMultiBlockDataSet (D)
            ++++ vtkUnstructuredGrid (6)
            ++++ vtkUnstructuredGrid (7)
            ++++ vtkUnstructuredGrid (8)

I have numbered the blocks for easier understanding.  Blocks  1-8  are empty UnstruturedGrid inserted for example with:
A->SetBlock ( 0, vtkSmartPointer<vtkUnstructuredGrid>::New() ) ,
A->SetBlock ( 1, vtkSmartPointer<vtkUnstructuredGrid>::New() ) ,
and  for (D):
D-> SetBlock (0, vtkSmartPointer<vtkUnstructuredGrid>::New() )
D-> SetBlock (1, vtkSmartPointer<vtkUnstructuredGrid>::New() )
D-> SetBlock (2, vtkSmartPointer<vtkUnstructuredGrid>::New() )  and so on.

The File I am reading has this structure and it won’t change , and the  idea  behind my reasoning  is a partial/incremental reading, i.e., I signal Paraview  I want to read blocks (1) and (2) –first pass-- , then  I want to read blocks (3) and (4) –second past-- , but keeping (1) and  (2). Since  I have read blocks(1) and (2) in the first pass, I want to skip these 2 steps (reading 1 and 2).

In the  third pass, I signalize Paraview   that  I want to keep blocks (2), (3) and (4)  dropping block (1).  Dropping means to me inserting  an empty grid with:  “ A->SetBlock ( 0, vtkSmartPointer<vtkUnstructuredGrid>::New() ) “

I tried using
root->GetBlock(0)->GetBlock(0)  to get (A) and  then insert the grid using A->SetBlock(0, grid_1 );

with an error    'class vtkDataObject' has no member named 'GetBlock'  for  root->GetBlock(0)  . I have read in the documentation that GetBlock returns a pointer to vtkObjectData . How can I convert this vtkObjectData in the proper type, or  in general how could I implement my algorithm with the given description ?

Any Help would be highly appreciated. Thanks in Advance  !!

Regards

Orlando








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