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David Thompson authored
+ Add vtkCellGridCellCenters filter to compute cell centers as vertex cells. + Add vtkCellGridCellSource algorithm to create a single cell of the specified type. + Add an example application "CellGridSource" that demonstrates how cell-grid data is structured in memory and allows people to edit coefficients to explore function spaces. + Provide CPU interpolation that uses the same basis functions as GPU interpolation. + Add a legacy VTK reader+writer for vtkCellGrid so that ParaView client-server rendering works for small data (which must be transferred to the client). + Replace Intrepid basis functions with Intrepid2 basis functions. + Add a vtkCellGridToUnstructuredGrid filter; the output will always have linear geometry even if the source uses quadratic or higher order interpolation. + Add an HDIV attribute to the `dgHexahedra.dg` sample data. + Make the vtkPassSelectedArrays filter accept and process vtkCellGrid instances. + Add vtkCellGridTransform filter to apply a (linear) transform to a cell-grid's shape attribute. + Add vtkCellGridWarp filter to add an HGRAD cell-attribute to a cell-grid's shape attribute. + Add `vtkCellGridAlgorithm::GetInputCellAttributeToProcess()` to mirror `vtkAlgorithm::GetInputAbstractArrayToProcess()` (but for cell-grids); and `vtkCellGridAlgorithm::SetInputAttributeToProcess()` to mirror `vtkAlgorithm::SetInputArrayToProcess()`. Note that cell-attributes may currently only be referenced by name. Eventually, we should allow them to be referenced not by "type" (i.e., field association) but by vtkCellAttribute::GetSpace(). + Add attribute range information to cell-grid reader/writer. + When copying cell-grid instances, copy cached cell-grid range information in some cases. + Support range computation for HDIV and HCURL function spaces. + Add a vtkIOSSCellGridReader class that reads exodus files that end with a `.exdg` suffix as cell-grids instead of unstructured-grids. This also ports Spiros's performance changes to the new reader: changes from 9e3af159 through c0eca941 are included. Nodsets are not supported yet. + Add an option to the vtkCellGridReader/Writer classes to load/save JSON as binary message-pack data instead of plain-text.
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