Pipeline for rendering vtkMultiBlockDataSet

ParaView Support
1

I would like to understand how to render a vtkMultiBlockDataSet made of vertices, lines, polygons and polyhedra. I can load my vtm file into Paraview and it works but I don’t understand what pipeline steps are used to make the rendering. I tried to look into the code, but not sure where to look.

Could you explain the mapper and filters you are using to make it work?

Thanks for the help

2

The multiblock surfacic data is extracted using the vtkDataSetSurfaceFilter and displayed using the vtkCompositePolyDataMapper. There is not much more to it.

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3

Thanks a lot for your quick answer!

4

I may have another question. How do you activate a Scalar property on PointData of the Blocks?

5

To be more exact, the mapper used is vtkCompositePolyDataMapper and the surface representation (vtkGeometryRepresentation) is computed using vtkPVGeometryFilter which internally uses vtkGeometryFilter (it used to use vtkDataSetSurfaceFilter).

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6

To set the scalar property for PointData of the Blocks, you need to use SetInputArrayToProcess on vtkGeometryRepresentation, which is exposed through the proxy using the ColorArrayName property.

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