mirror of
https://gitlab.kitware.com/vtk/vtk-m
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134 lines
4.9 KiB
C++
134 lines
4.9 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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//
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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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#ifndef vtk_m_filter_particle_density_cic_hxx
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#define vtk_m_filter_particle_density_cic_hxx
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#include <vtkm/cont/ArrayCopy.h>
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#include <vtkm/cont/CellLocatorUniformGrid.h>
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#include <vtkm/cont/DataSetBuilderUniform.h>
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#include <vtkm/filter/PolicyBase.h>
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#include <vtkm/worklet/WorkletMapField.h>
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namespace vtkm
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{
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namespace worklet
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{
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class CICWorklet : public vtkm::worklet::WorkletMapField
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{
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public:
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using ControlSignature = void(FieldIn coords,
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FieldIn field,
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ExecObject locator,
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WholeCellSetIn<Cell, Point> cellSet,
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AtomicArrayInOut density);
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using ExecutionSignature = void(_1, _2, _3, _4, _5);
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template <typename Point,
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typename T,
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typename CellLocatorExecObj,
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typename CellSet,
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typename AtomicArray>
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VTKM_EXEC void operator()(const Point& point,
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const T value,
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const CellLocatorExecObj& locator,
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const CellSet& cellSet,
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AtomicArray& density) const
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{
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vtkm::Id cellId{};
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vtkm::Vec3f parametric;
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if (locator.FindCell(point, cellId, parametric) == vtkm::ErrorCode::Success)
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{
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// iterate through all the points of the cell and deposit with correct weight.
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auto indices = cellSet.GetIndices(cellId);
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auto rparametric = vtkm::Vec3f{ 1, 1, 1 } - parametric;
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// deposit the scalar field value in proportion to the volume of the sub-hexahedron
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// the vertex is in.
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density.Add(indices[0], value * parametric[0] * parametric[1] * parametric[2]);
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density.Add(indices[1], value * rparametric[0] * parametric[1] * parametric[2]);
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density.Add(indices[2], value * rparametric[0] * rparametric[1] * parametric[2]);
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density.Add(indices[3], value * parametric[0] * rparametric[1] * parametric[2]);
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density.Add(indices[4], value * parametric[0] * parametric[1] * rparametric[2]);
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density.Add(indices[5], value * rparametric[0] * parametric[1] * rparametric[2]);
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density.Add(indices[6], value * rparametric[0] * rparametric[1] * rparametric[2]);
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density.Add(indices[7], value * parametric[0] * rparametric[1] * rparametric[2]);
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}
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// We simply ignore that particular particle when it is not in the mesh.
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}
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};
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} // worklet
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} // vtkm
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namespace vtkm
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{
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namespace filter
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{
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inline VTKM_CONT ParticleDensityCloudInCell::ParticleDensityCloudInCell(const vtkm::Id3& dimension,
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const vtkm::Vec3f& origin,
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const vtkm::Vec3f& spacing)
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: Superclass(dimension, origin, spacing)
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{
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}
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inline VTKM_CONT ParticleDensityCloudInCell::ParticleDensityCloudInCell(const Id3& dimension,
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const vtkm::Bounds& bounds)
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: Superclass(dimension, bounds)
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{
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}
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template <typename T, typename StorageType, typename Policy>
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inline VTKM_CONT vtkm::cont::DataSet ParticleDensityCloudInCell::DoExecute(
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const cont::DataSet& dataSet,
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const cont::ArrayHandle<T, StorageType>& field,
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const vtkm::filter::FieldMetadata&,
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PolicyBase<Policy>)
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{
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// Unlike ParticleDensityNGP, particle deposit mass on the grid points, thus it is natural to
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// return the density as PointField;
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auto uniform = vtkm::cont::DataSetBuilderUniform::Create(
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this->Dimension + vtkm::Id3{ 1, 1, 1 }, this->Origin, this->Spacing);
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vtkm::cont::CellLocatorUniformGrid locator;
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locator.SetCellSet(uniform.GetCellSet());
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locator.SetCoordinates(uniform.GetCoordinateSystem());
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locator.Update();
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auto coords = dataSet.GetCoordinateSystem().GetDataAsMultiplexer();
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vtkm::cont::ArrayHandle<T> density;
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vtkm::cont::ArrayCopy(vtkm::cont::ArrayHandleConstant<T>(0, uniform.GetNumberOfPoints()),
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density);
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this->Invoke(vtkm::worklet::CICWorklet{},
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coords,
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field,
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locator,
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uniform.GetCellSet().template Cast<vtkm::cont::CellSetStructured<3>>(),
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density);
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if (DivideByVolume)
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{
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auto volume = this->Spacing[0] * this->Spacing[1] * this->Spacing[2];
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this->Invoke(DivideByVolumeWorklet{ volume }, density);
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}
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uniform.AddField(vtkm::cont::make_FieldPoint("density", density));
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return uniform;
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}
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}
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}
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#endif // vtk_m_filter_particle_density_cic_hxx
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