mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-16 17:22:55 +00:00
947178e7e4
These cell types are inherited from VTK, but they are basically the same as quad and hexahedron, respectively. The only useful difference is that pixel and voxel are supposed to be axis aligned, but you cannot determine that by the cell shape alone (at least not just from the cell set). A big issue with these is that their indexing is different that of quad and hex. The development team had a long discussion about the benefits of the alternate indexing, but after consulting with Berk Geveci and Will Schroder from the VTK team, that indexing is not really taken advantage of at the cell level. Thus, it is really just a nuisance in VTK-m.
128 lines
4.5 KiB
C++
128 lines
4.5 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//
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// Copyright 2014 Sandia Corporation.
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// Copyright 2014 UT-Battelle, LLC.
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// Copyright 2014 Los Alamos National Security.
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//============================================================================
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#ifndef vtk_m_CellTraits_h
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#define vtk_m_CellTraits_h
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#include <vtkm/CellShape.h>
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namespace vtkm {
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/// \c vtkm::CellTraits::TopologyDimensionType is typedef to this with the
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/// template parameter set to \c TOPOLOGICAL_DIMENSIONS. See \c
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/// vtkm::CellTraits for more information.
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///
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template<vtkm::IdComponent dimension>
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struct CellTopologicalDimensionsTag { };
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/// \brief Tag for cell shapes with a fixed number of points.
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///
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struct CellTraitsTagSizeFixed { };
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/// \brief Tag for cell shapes that can have a variable number of points.
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///
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struct CellTraitsTagSizeVariable { };
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/// \brief Information about a cell based on its tag.
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///
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/// The templated CellTraits struct provides the basic high level information
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/// about cells (like the number of vertices in the cell or its
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/// dimensionality).
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///
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template<class CellTag>
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struct CellTraits
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#ifdef VTKM_DOXYGEN_ONLY
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{
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/// This defines the topological dimensions of the cell type. 3 for
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/// polyhedra, 2 for polygons, 1 for lines, 0 for points.
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///
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const static vtkm::IdComponent TOPOLOGICAL_DIMENSIONS = 3;
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/// This tag is typedef'ed to
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/// vtkm::CellTopologicalDimensionsTag<TOPOLOGICAL_DIMENSIONS>. This provides
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/// a convenient way to overload a function based on topological dimensions
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/// (which is usually more efficient than conditionals).
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///
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typedef vtkm::CellTopologicalDimensionsTag<TOPOLOGICAL_DIMENSIONS>
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TopologicalDimensionsTag;
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/// \brief A tag specifying whether the number of points is fixed.
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///
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/// If set to \c CellTraitsTagSizeFixed, then \c NUM_POINTS is set. If set to
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/// \c CellTraitsTagSizeVariable, then the number of points is not known at
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/// compile time.
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///
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typedef vtkm::CellTraitsTagSizeFixed IsSizeFixed;
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/// \brief Number of points in the cell.
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///
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/// This is only defined for cell shapes of a fixed number of points (i.e.
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/// \c IsSizedFixed is set to \c CellTraitsTagSizeFixed.
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///
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static const vtkm::IdComponent NUM_POINTS = 3;
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};
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#else // VTKM_DOXYGEN_ONLY
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;
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#endif // VTKM_DOXYGEN_ONLY
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//-----------------------------------------------------------------------------
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// Define traits for every cell type.
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#define VTKM_DEFINE_CELL_TRAITS(name, dimensions, numPoints) \
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template<> \
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struct CellTraits<vtkm::CellShapeTag ## name> { \
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const static vtkm::IdComponent TOPOLOGICAL_DIMENSIONS = dimensions; \
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typedef vtkm::CellTopologicalDimensionsTag<TOPOLOGICAL_DIMENSIONS> \
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TopologicalDimensionsTag; \
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typedef vtkm::CellTraitsTagSizeFixed IsSizeFixed; \
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static const vtkm::IdComponent NUM_POINTS = numPoints; \
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}
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#define VTKM_DEFINE_CELL_TRAITS_VARIABLE(name, dimensions) \
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template<> \
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struct CellTraits<vtkm::CellShapeTag ## name> { \
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const static vtkm::IdComponent TOPOLOGICAL_DIMENSIONS = dimensions; \
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typedef vtkm::CellTopologicalDimensionsTag<TOPOLOGICAL_DIMENSIONS> \
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TopologicalDimensionsTag; \
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typedef vtkm::CellTraitsTagSizeVariable IsSizeFixed; \
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}
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VTKM_DEFINE_CELL_TRAITS(Empty, 0, 0);
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VTKM_DEFINE_CELL_TRAITS(Vertex, 0, 1);
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//VTKM_DEFINE_CELL_TRAITS_VARIABLE(PolyVertex, 0);
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VTKM_DEFINE_CELL_TRAITS(Line, 1, 2);
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//VTKM_DEFINE_CELL_TRAITS_VARIABLE(PolyLine, 1);
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VTKM_DEFINE_CELL_TRAITS(Triangle, 2, 3);
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//VTKM_DEFINE_CELL_TRAITS_VARIABLE(TriangleStrip, 2);
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VTKM_DEFINE_CELL_TRAITS_VARIABLE(Polygon, 2);
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//VTKM_DEFINE_CELL_TRAITS(Pixel, 2, 4);
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VTKM_DEFINE_CELL_TRAITS(Quad, 2, 4);
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VTKM_DEFINE_CELL_TRAITS(Tetra, 3, 4);
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//VTKM_DEFINE_CELL_TRAITS(Voxel, 3, 8);
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VTKM_DEFINE_CELL_TRAITS(Hexahedron, 3, 8);
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VTKM_DEFINE_CELL_TRAITS(Wedge, 3, 6);
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VTKM_DEFINE_CELL_TRAITS(Pyramid, 3, 5);
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#undef VTKM_DEFINE_CELL_TRAITS
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} // namespace vtkm
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#endif //vtk_m_CellTraits_h
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