[vtkusers] vtkMultiBlockDataSets: Pipeline does not get updated in Release 8

[Heller, Bastian]

Hello everyone,

i am developing a tool where I need to visualize geometries consisting of multiple (>100) blocks as unstructured grids. In order to handle these structures efficiently, i’d like to use vtkMultiBlockDataSets. Geometries are extracted using a vtkGeometryFilter, connected to a vtkCompositePolyDataMapper2. The code I am using to link the elements is as follows:

vtkSmartPointer<vtkCompositeDataPipeline> exec =
                vtkSmartPointer<vtkCompositeDataPipeline>::New();
vtkAlgorithm::SetDefaultExecutivePrototype(exec);

/* Create a display attributes set for the mapper */
vtkSmartPointer<vtkCompositeDataDisplayAttributes> spAttribs =
                vtkSmartPointer<vtkCompositeDataDisplayAttributes>::New();

/* Datasets */
vtkSmartPointer<vtkMultiBlockDataSet> _spMbMeshes =
                vtkSmartPointer<vtkMultiBlockDataSet>::New();
_spMbMeshes->SetNumberOfBlocks(0);

/* Filters and mappers */
vtkSmartPointer<vtkGeometryFilter> _spMeshFilter =
                vtkSmartPointer<vtkGeometryFilter>::New();
vtkSmartPointer<vtkCompositePolyDataMapper2> _spMeshMapper =
                vtkSmartPointer<vtkCompositePolyDataMapper2>::New();
vtkSmartPointer<vtkActor> _spMeshActor = vtkSmartPointer<vtkActor>::New();

/* Create connections */
_spMeshMapper->SetCompositeDataDisplayAttributes(spAttribs);
_spMeshFilter->SetInputData(this->_spMbMeshes);
_spMeshMapper->SetInputConnection(this->_spMeshFilter->GetOutputPort());
_spMeshActor->SetMapper(this->_spMeshMapper);

/* Add actors to renderer */
_spRenderer->AddActor(this->_spMeshActor);

Now, when I add blocks to the multiblock (_spMbMeshes), in VTK 7.1.1, everything executes correctly and the elements are shown. However, when I switch to VTK 8.1, only one of the datasets I added will be shown (which seemed to be the last one added to the block). I didn’t find any information in the changelogs, regarding this issue.

My question: Where am I going wrong and what do I have to change to make this code work in VTK 8? Thank you very much in advance.

Yours,

Bastian



Bastian Heller

CAE Prozesse und Optimierung - Services & Development

ISKO engineers AG
Marie-Curie-Straße 2, 85055 Ingolstadt
Fon: +49 8458 3112-286
Fax: +49 8458 3112-199

Mail: bastian.heller at isko-engineers.de


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