689ba00e4c
While updating the slides for an upcoming tutorial, some minor changes were made to the tutorial examples to more clearly explain concepts or simply fit things better on slides.
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/NewFilterField.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::NewFilterField
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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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