mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-10-05 01:49:02 +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++
//============================================================================
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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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#include <vtkm/VectorAnalysis.h>
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#include <vtkm/cont/Initialize.h>
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#include <vtkm/cont/Invoker.h>
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#include <vtkm/filter/Filter.h>
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#include <vtkm/filter/vector_analysis/Gradient.h>
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#include <vtkm/io/VTKDataSetReader.h>
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#include <vtkm/io/VTKDataSetWriter.h>
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#include <vtkm/worklet/WorkletMapField.h>
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// Worklet that does the actual work on the device.
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struct ComputeMagnitude : vtkm::worklet::WorkletMapField
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{
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using ControlSignature = void(FieldIn inputVectors, FieldOut outputMagnitudes);
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VTKM_EXEC void operator()(const vtkm::Vec3f& inVector, vtkm::FloatDefault& outMagnitude) const
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{
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outMagnitude = vtkm::Magnitude(inVector);
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}
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};
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// The filter class used by external code to run the algorithm. Normally the class definition
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// is in a separate header file.
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class FieldMagnitude : public vtkm::filter::Filter
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{
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protected:
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VTKM_CONT vtkm::cont::DataSet DoExecute(const vtkm::cont::DataSet& inDataSet) override;
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};
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// Implementation for the filter. Normally this is in its own .cxx file.
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VTKM_CONT vtkm::cont::DataSet FieldMagnitude::DoExecute(const vtkm::cont::DataSet& inDataSet)
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{
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const vtkm::cont::Field& inField = this->GetFieldFromDataSet(inDataSet);
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vtkm::cont::ArrayHandle<vtkm::FloatDefault> outArrayHandle;
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auto resolveType = [&](const auto& inArrayHandle) {
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this->Invoke(ComputeMagnitude{}, inArrayHandle, outArrayHandle);
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};
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this->CastAndCallVecField<3>(inField, resolveType);
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std::string outFieldName = this->GetOutputFieldName();
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if (outFieldName == "")
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{
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outFieldName = inField.GetName() + "_magnitude";
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}
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return this->CreateResultField(inDataSet, outFieldName, inField.GetAssociation(), outArrayHandle);
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}
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int main(int argc, char** argv)
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{
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auto opts = vtkm::cont::InitializeOptions::DefaultAnyDevice;
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vtkm::cont::InitializeResult config = vtkm::cont::Initialize(argc, argv, opts);
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vtkm::io::VTKDataSetReader reader("data/kitchen.vtk");
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vtkm::cont::DataSet ds_from_file = reader.ReadDataSet();
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vtkm::filter::vector_analysis::Gradient grad;
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grad.SetActiveField("c1");
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vtkm::cont::DataSet ds_from_grad = grad.Execute(ds_from_file);
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FieldMagnitude mag;
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mag.SetActiveField("Gradients");
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vtkm::cont::DataSet mag_grad = mag.Execute(ds_from_grad);
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vtkm::io::VTKDataSetWriter writer("out_mag_grad.vtk");
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writer.WriteDataSet(mag_grad);
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return 0;
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}
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