mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-08 13:23:51 +00:00
5aba6e1bea
Some of the test data sets are derived from data sets that are commonly distributed to test visualization algorithms and are featured in numerous papers. However, I am unable to track down the original source let alone identify what license, if any, they were released under. To avoid any complications with data ownership, remove these data sets and replace them with in house data sets that we explicitly own.
92 lines
3.1 KiB
C++
92 lines
3.1 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/Particle.h>
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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/flow/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: rotate-vectors.vtk
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// Example usage:
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// this will advect 200 particles 50 steps using a step size of 0.05
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//
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// Particle_Advection <path-to-data-dir>/rotate-vectors.vtk rotate 200 50 0.05 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 < 7)
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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.SetPosition({ static_cast<vtkm::FloatDefault>(bounds.X.Min + rx * bounds.X.Length()),
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static_cast<vtkm::FloatDefault>(bounds.Y.Min + ry * bounds.Y.Length()),
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static_cast<vtkm::FloatDefault>(bounds.Z.Min + rz * bounds.Z.Length()) });
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p.SetID(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::flow::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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