mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-07-06 07:17:25 +00:00
a17ebdf52a
The original design of the filter base class required several specialized base classes to control what information was pulled from the input `DataSet` and provided to the derived class. Since the filter base class was redesigned, the derived classes all get a `DataSet` and pull their own information from it. Thus, most specialized filter base classes became unnecessary and removed. The one substantial exception was the `FilterField`. This filter base class managed input and output arrays. This was kept separate from the base `Filter` because not all filters need the ability to select this information. That said, this separation has not been particularly helpful. There are several other features of `Filter` that does not apply to all subclasses. Furthermore, there are several derived filters that are using `FilterField` merely to pick a single part, like selecting a coordinate system, and ignoring the rest of the abilities. Thus, it makes more sense to deprecate `FilterField` and have these classes inherit directly from `Filter`.
82 lines
2.7 KiB
C++
82 lines
2.7 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.
|
|
//============================================================================
|
|
#include <vtkm/VectorAnalysis.h>
|
|
|
|
#include <vtkm/cont/Initialize.h>
|
|
#include <vtkm/cont/Invoker.h>
|
|
|
|
#include <vtkm/filter/Filter.h>
|
|
#include <vtkm/filter/vector_analysis/Gradient.h>
|
|
#include <vtkm/io/VTKDataSetReader.h>
|
|
#include <vtkm/io/VTKDataSetWriter.h>
|
|
|
|
#include <vtkm/worklet/WorkletMapField.h>
|
|
|
|
// Worklet that does the actual work on the device.
|
|
struct ComputeMagnitude : vtkm::worklet::WorkletMapField
|
|
{
|
|
using ControlSignature = void(FieldIn inputVectors, FieldOut outputMagnitudes);
|
|
|
|
VTKM_EXEC void operator()(const vtkm::Vec3f& inVector, vtkm::FloatDefault& outMagnitude) const
|
|
{
|
|
outMagnitude = vtkm::Magnitude(inVector);
|
|
}
|
|
};
|
|
|
|
// The filter class used by external code to run the algorithm. Normally the class definition
|
|
// is in a separate header file.
|
|
class FieldMagnitude : public vtkm::filter::Filter
|
|
{
|
|
protected:
|
|
VTKM_CONT vtkm::cont::DataSet DoExecute(const vtkm::cont::DataSet& inDataSet) override;
|
|
};
|
|
|
|
// Implementation for the filter. Normally this is in its own .cxx file.
|
|
VTKM_CONT vtkm::cont::DataSet FieldMagnitude::DoExecute(const vtkm::cont::DataSet& inDataSet)
|
|
{
|
|
const vtkm::cont::Field& inField = this->GetFieldFromDataSet(inDataSet);
|
|
vtkm::cont::ArrayHandle<vtkm::FloatDefault> outArrayHandle;
|
|
|
|
auto resolveType = [&](const auto& inArrayHandle) {
|
|
this->Invoke(ComputeMagnitude{}, inArrayHandle, outArrayHandle);
|
|
};
|
|
this->CastAndCallVecField<3>(inField, resolveType);
|
|
|
|
std::string outFieldName = this->GetOutputFieldName();
|
|
if (outFieldName == "")
|
|
{
|
|
outFieldName = inField.GetName() + "_magnitude";
|
|
}
|
|
|
|
return this->CreateResultField(inDataSet, outFieldName, inField.GetAssociation(), outArrayHandle);
|
|
}
|
|
|
|
int main(int argc, char** argv)
|
|
{
|
|
auto opts = vtkm::cont::InitializeOptions::DefaultAnyDevice;
|
|
vtkm::cont::InitializeResult config = vtkm::cont::Initialize(argc, argv, opts);
|
|
|
|
vtkm::io::VTKDataSetReader reader("data/kitchen.vtk");
|
|
vtkm::cont::DataSet ds_from_file = reader.ReadDataSet();
|
|
|
|
vtkm::filter::vector_analysis::Gradient grad;
|
|
grad.SetActiveField("c1");
|
|
vtkm::cont::DataSet ds_from_grad = grad.Execute(ds_from_file);
|
|
|
|
FieldMagnitude mag;
|
|
mag.SetActiveField("Gradients");
|
|
vtkm::cont::DataSet mag_grad = mag.Execute(ds_from_grad);
|
|
|
|
vtkm::io::VTKDataSetWriter writer("out_mag_grad.vtk");
|
|
writer.WriteDataSet(mag_grad);
|
|
|
|
return 0;
|
|
}
|