mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-08 13:23:51 +00:00
91 lines
3.0 KiB
C++
91 lines
3.0 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/cont/DataSet.h>
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#include <vtkm/cont/Initialize.h>
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#include <vtkm/filter/Streamline.h>
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#include <vtkm/io/VTKDataSetReader.h>
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#include <vtkm/io/VTKDataSetWriter.h>
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// Example computing streamlines.
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// An example vector field is available in the vtk-m data directory: magField.vtk
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// Example usage:
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// this will advect 200 particles 50 steps using a step size of 0.01
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//
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// Particle_Advection <path-to-data-dir>/magField.vtk vec 200 50 0.01 output.vtk
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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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auto config = vtkm::cont::Initialize(argc, argv, opts);
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if (argc < 8)
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{
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std::cerr << "Usage: " << argv[0]
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<< "dataFile varName numSeeds numSteps stepSize outputFile [options]" << std::endl;
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std::cerr << "where options are: " << std::endl << config.Usage << std::endl;
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return -1;
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}
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std::string dataFile = argv[1];
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std::string varName = argv[2];
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vtkm::Id numSeeds = std::stoi(argv[3]);
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vtkm::Id numSteps = std::stoi(argv[4]);
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vtkm::FloatDefault stepSize = std::stof(argv[5]);
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std::string outputFile = argv[6];
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vtkm::cont::DataSet ds;
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if (dataFile.find(".vtk") != std::string::npos)
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{
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vtkm::io::VTKDataSetReader rdr(dataFile);
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ds = rdr.ReadDataSet();
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}
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else
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{
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std::cerr << "Unsupported data file: " << dataFile << std::endl;
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return -1;
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}
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//create seeds randomly placed withing the bounding box of the data.
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vtkm::Bounds bounds = ds.GetCoordinateSystem().GetBounds();
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std::vector<vtkm::Particle> seeds;
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for (vtkm::Id i = 0; i < numSeeds; i++)
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{
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vtkm::Particle p;
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vtkm::FloatDefault rx = (vtkm::FloatDefault)rand() / (vtkm::FloatDefault)RAND_MAX;
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vtkm::FloatDefault ry = (vtkm::FloatDefault)rand() / (vtkm::FloatDefault)RAND_MAX;
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vtkm::FloatDefault rz = (vtkm::FloatDefault)rand() / (vtkm::FloatDefault)RAND_MAX;
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p.Pos[0] = static_cast<vtkm::FloatDefault>(bounds.X.Min + rx * bounds.X.Length());
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p.Pos[1] = static_cast<vtkm::FloatDefault>(bounds.Y.Min + ry * bounds.Y.Length());
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p.Pos[2] = static_cast<vtkm::FloatDefault>(bounds.Z.Min + rz * bounds.Z.Length());
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p.ID = i;
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seeds.push_back(p);
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}
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auto seedArray = vtkm::cont::make_ArrayHandle(seeds, vtkm::CopyFlag::Off);
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//compute streamlines
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vtkm::filter::Streamline streamline;
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streamline.SetStepSize(stepSize);
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streamline.SetNumberOfSteps(numSteps);
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streamline.SetSeeds(seedArray);
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streamline.SetActiveField(varName);
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auto output = streamline.Execute(ds);
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vtkm::io::VTKDataSetWriter wrt(outputFile);
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wrt.WriteDataSet(output);
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return 0;
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}
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