mirror of
https://gitlab.kitware.com/vtk/vtk-m
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123 lines
4.2 KiB
C++
123 lines
4.2 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_ngp_hxx
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#define vtk_m_filter_particle_density_ngp_hxx
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#include <vtkm/cont/ArrayCopy.h>
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#include <vtkm/cont/ArrayHandleConstant.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 NGPWorklet : 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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AtomicArrayInOut density);
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using ExecutionSignature = void(_1, _2, _3, _4);
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template <typename Point, typename T, typename CellLocatorExecObj, 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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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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// Find the cell containing the point
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if (locator.FindCell(point, cellId, parametric) == vtkm::ErrorCode::Success)
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{
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// deposit field value to density
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density.Add(cellId, value);
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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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}; //NGPWorklet
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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 ParticleDensityNearestGridPoint::ParticleDensityNearestGridPoint(
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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 ParticleDensityNearestGridPoint::ParticleDensityNearestGridPoint(
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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 ParticleDensityNearestGridPoint::DoExecute(
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const vtkm::cont::DataSet& dataSet,
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const vtkm::cont::ArrayHandle<T, StorageType>&
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field, // particles' scala field to be deposited to the mesh, e.g. mass or charge
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const vtkm::filter::FieldMetadata&,
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vtkm::filter::PolicyBase<Policy>)
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{
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// TODO: it really doesn't need to be a UniformGrid, any CellSet with CellLocator will work.
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// Make it another input rather an output generated.
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// We stores density as CellField which conforms to physicists' idea of particle density
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// better. However, VTK/VTKm's idea of "Image" Dataset and the ImageConnectivity filter
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// expect a PointField. For better separation of concerns, we create a uniform dataset
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// that has the cell dimension as expected and later convert the dataset to its dual.
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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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// Create a CellLocator
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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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// We create an ArrayHandle and pass it to the Worklet as AtomicArrayInOut.
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// However the ArrayHandle needs to be allocated and initialized first. The
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// easiest way to do it is to copy from an ArrayHandleConstant
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vtkm::cont::ArrayHandle<T> density;
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vtkm::cont::ArrayCopy(vtkm::cont::ArrayHandleConstant<T>(0, uniform.GetNumberOfCells()), density);
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this->Invoke(vtkm::worklet::NGPWorklet{}, coords, field, locator, 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_FieldCell("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_ngp_hxx
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