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Color separate blocks with different scalar arrays

Jaswant Panchumarti (Kitware) requested to merge jaswant.panchumarti/vtk:scalar-color-array-per-block into master

vtkCompositePolyDataMapper can now color separate blocks with different scalar arrays. In order to use this functionality, turn on ScalarVisibility and select a ScalarMode and/or a ColorMode.

You can choose which scalar array or component of an array is used to map colors by overriding these parameters per block. Refer to vtkMapper documentation. Here's a summary:

  1. ArrayAccessMode: VTK_GET_ARRAY_BY_ID or VTK_GET_ARRAY_BY_NAME
  2. ArrayComponent: which component should be used to map an array?
  3. ArrayId: Applicable when arrays are accessed by indices. this integer is an index of the vtkDataArray on the point/cell data.
  4. ArrayName: Applicable when arrays are accessed by names.
  5. FieldDataTupleId: this integer is an index of the vtkDataArray on the field data.

The new unit test colors a partitoned dataset collection with 5 leaf vtkPolyData. Four quads are colored by different scalar arrays each with a dedicated lookup table. The last quad does not have any scalars, so it is colored by a special NaN color.

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TestCompositePolyDataMapperOverrideScalarArray

Edited by Jaswant Panchumarti (Kitware)

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