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IOSS reader and improved basis-function support for vtkCellGrid

David Thompson requested to merge dcthomp/vtk:dg-work into master
  • An IOSS reader for vtkCellGrids.
  • Improved vtkCellGridComputeSides filter (which can compute internal, not just external sides).
  • Large basis function library for novel (H-curl/div) and quadratic interpolation (including 18- and 19-node pyramids) organized for use on CPU and GPU-based code. This adds the concept of generic "operator" functions which includes the basis and gradient of the basis but may be extended to operators such as curl and div.
  • Changes to vtkCellAttribute to allow each cell type to use a different interpolant basis function and order.
  • Fixed parameter-space coordinates for some cell shapes.

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