120 lines
4.2 KiB
C++
120 lines
4.2 KiB
C++
//============================================================================
|
|
// Copyright (c) Kitware, Inc.
|
|
// All rights reserved.
|
|
// See LICENSE.txt for details.
|
|
//
|
|
// This software is distributed WITHOUT ANY WARRANTY; without even
|
|
// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
|
// PURPOSE. See the above copyright notice for more information.
|
|
//============================================================================
|
|
|
|
#ifndef vtk_m_filter_particle_density_ngp_hxx
|
|
#define vtk_m_filter_particle_density_ngp_hxx
|
|
|
|
#include "ParticleDensityNearestGridPoint.h"
|
|
#include <vtkm/cont/CellLocatorUniformGrid.h>
|
|
#include <vtkm/cont/DataSetBuilderUniform.h>
|
|
#include <vtkm/filter/PolicyBase.h>
|
|
#include <vtkm/worklet/WorkletMapField.h>
|
|
|
|
namespace vtkm
|
|
{
|
|
namespace worklet
|
|
{
|
|
class NGPWorklet : public vtkm::worklet::WorkletMapField
|
|
{
|
|
public:
|
|
using ControlSignature = void(FieldIn coords, ExecObject locator, AtomicArrayInOut density);
|
|
using ExecutionSignature = void(_1, _2, _3);
|
|
|
|
template <typename Point, typename CellLocatorExecObj, typename AtomicArray>
|
|
VTKM_EXEC void operator()(const Point& point,
|
|
const CellLocatorExecObj& locator,
|
|
AtomicArray& density) const
|
|
{
|
|
vtkm::Id cellId{};
|
|
vtkm::Vec3f parametric;
|
|
|
|
// Find the cell containing the point
|
|
if (locator->FindCell(point, cellId, parametric) == vtkm::ErrorCode::Success)
|
|
{
|
|
// increment density
|
|
density.Add(cellId, 1);
|
|
}
|
|
|
|
// FIXME: what does mean when it is not found?
|
|
// We simply ignore that particular particle.
|
|
}
|
|
}; //NGPWorklet
|
|
} //worklet
|
|
} //vtkm
|
|
|
|
|
|
namespace vtkm
|
|
{
|
|
namespace filter
|
|
{
|
|
inline VTKM_CONT ParticleDensityNearestGridPoint::ParticleDensityNearestGridPoint(
|
|
const vtkm::Id3& dimension,
|
|
const vtkm::Vec3f& origin,
|
|
const vtkm::Vec3f& spacing)
|
|
: Dimension(dimension)
|
|
, Origin(origin)
|
|
, Spacing(spacing)
|
|
{
|
|
}
|
|
|
|
ParticleDensityNearestGridPoint::ParticleDensityNearestGridPoint(const Id3& dimension,
|
|
const vtkm::Bounds& bounds)
|
|
: Dimension(dimension)
|
|
, Origin({ static_cast<vtkm::FloatDefault>(bounds.X.Min),
|
|
static_cast<vtkm::FloatDefault>(bounds.Y.Min),
|
|
static_cast<vtkm::FloatDefault>(bounds.Z.Min) })
|
|
, Spacing(vtkm::Vec3f{ static_cast<vtkm::FloatDefault>(bounds.X.Length()),
|
|
static_cast<vtkm::FloatDefault>(bounds.Y.Length()),
|
|
static_cast<vtkm::FloatDefault>(bounds.Z.Length()) } /
|
|
Dimension)
|
|
{
|
|
}
|
|
|
|
template <typename T, typename StorageType, typename Policy>
|
|
inline VTKM_CONT vtkm::cont::DataSet ParticleDensityNearestGridPoint::DoExecute(
|
|
const vtkm::cont::DataSet&,
|
|
const vtkm::cont::ArrayHandle<T, StorageType>& field,
|
|
const vtkm::filter::FieldMetadata&,
|
|
vtkm::filter::PolicyBase<Policy>)
|
|
{
|
|
// TODO: it really doesn't need to be a UniformGrid, any CellSet with CellLocator will work.
|
|
// Make it another input rather an output generated.
|
|
|
|
// We stores density as CellField which conforms to physicists' idea of particle density
|
|
// better. However, VTK/VTKm's idea of "Image" Dataset and the ImageConnectivity filter
|
|
// expect a PointField. For better separation of concerns, we create a uniform dataset
|
|
// that has the cell dimension as expected and later convert the dataset to its dual.
|
|
auto uniform = vtkm::cont::DataSetBuilderUniform::Create(
|
|
this->Dimension + vtkm::Id3{ 1, 1, 1 }, this->Origin, this->Spacing);
|
|
|
|
// Create a CellLocator
|
|
vtkm::cont::CellLocatorUniformGrid locator;
|
|
locator.SetCellSet(uniform.GetCellSet());
|
|
locator.SetCoordinates(uniform.GetCoordinateSystem());
|
|
locator.Update();
|
|
|
|
// We create an ArrayHandle and pass it to the Worklet as AtomicArrayInOut.
|
|
// However the ArrayHandle needs to be allocated and initialized first. The
|
|
// easily way to do it is to copy from an ArrayHandleConstant
|
|
vtkm::cont::ArrayHandle<vtkm::Id> density;
|
|
vtkm::cont::ArrayCopy(vtkm::cont::ArrayHandleConstant<vtkm::Id>(0, uniform.GetNumberOfCells()),
|
|
density);
|
|
|
|
this->Invoke(vtkm::worklet::NGPWorklet{}, field, locator, density);
|
|
|
|
uniform.AddField(vtkm::cont::make_FieldCell("density", density));
|
|
|
|
return uniform;
|
|
}
|
|
|
|
}
|
|
}
|
|
#endif //vtk_m_filter_particle_density_ngp_hxx
|