mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-08 13:23:51 +00:00
237 lines
8.3 KiB
C++
237 lines
8.3 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/exec/FunctorBase.h>
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#include <vtkm/exec/ParametricCoordinates.h>
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#include <vtkm/CellTraits.h>
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#include <vtkm/StaticAssert.h>
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#include <vtkm/VecVariable.h>
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#include <vtkm/testing/Testing.h>
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#include <ctime>
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#include <random>
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#define CHECK_CALL(call) \
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VTKM_TEST_ASSERT((call) == vtkm::ErrorCode::Success, "Call resulted in error.")
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namespace
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{
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std::mt19937 g_RandomGenerator;
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static constexpr vtkm::IdComponent MAX_POINTS = 8;
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template <typename CellShapeTag>
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void GetMinMaxPoints(CellShapeTag,
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vtkm::CellTraitsTagSizeFixed,
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vtkm::IdComponent& minPoints,
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vtkm::IdComponent& maxPoints)
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{
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// If this line fails, then MAX_POINTS is not large enough to support all
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// cell shapes.
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VTKM_STATIC_ASSERT((vtkm::CellTraits<CellShapeTag>::NUM_POINTS <= MAX_POINTS));
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minPoints = maxPoints = vtkm::CellTraits<CellShapeTag>::NUM_POINTS;
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}
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template <typename CellShapeTag>
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void GetMinMaxPoints(CellShapeTag,
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vtkm::CellTraitsTagSizeVariable,
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vtkm::IdComponent& minPoints,
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vtkm::IdComponent& maxPoints)
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{
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minPoints = 1;
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maxPoints = MAX_POINTS;
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}
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template <typename PointWCoordsType, typename T, typename CellShapeTag>
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static void CompareCoordinates(const PointWCoordsType& pointWCoords,
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vtkm::Vec<T, 3> truePCoords,
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vtkm::Vec<T, 3> trueWCoords,
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CellShapeTag shape)
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{
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using Vector3 = vtkm::Vec<T, 3>;
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Vector3 computedWCoords;
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CHECK_CALL(vtkm::exec::ParametricCoordinatesToWorldCoordinates(
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pointWCoords, truePCoords, shape, computedWCoords));
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VTKM_TEST_ASSERT(test_equal(computedWCoords, trueWCoords, 0.01),
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"Computed wrong world coords from parametric coords.");
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Vector3 computedPCoords;
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CHECK_CALL(vtkm::exec::WorldCoordinatesToParametricCoordinates(
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pointWCoords, trueWCoords, shape, computedPCoords));
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VTKM_TEST_ASSERT(test_equal(computedPCoords, truePCoords, 0.01),
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"Computed wrong parametric coords from world coords.");
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}
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template <typename PointWCoordsType, typename CellShapeTag>
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void TestPCoordsSpecial(const PointWCoordsType& pointWCoords, CellShapeTag shape)
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{
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using Vector3 = typename PointWCoordsType::ComponentType;
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using T = typename Vector3::ComponentType;
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const vtkm::IdComponent numPoints = pointWCoords.GetNumberOfComponents();
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for (vtkm::IdComponent pointIndex = 0; pointIndex < numPoints; pointIndex++)
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{
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Vector3 pcoords;
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CHECK_CALL(vtkm::exec::ParametricCoordinatesPoint(numPoints, pointIndex, shape, pcoords));
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Vector3 wcoords = pointWCoords[pointIndex];
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CompareCoordinates(pointWCoords, pcoords, wcoords, shape);
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}
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{
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Vector3 wcoords = pointWCoords[0];
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for (vtkm::IdComponent pointIndex = 1; pointIndex < numPoints; pointIndex++)
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{
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wcoords = wcoords + pointWCoords[pointIndex];
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}
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wcoords = wcoords / Vector3(T(numPoints));
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Vector3 pcoords;
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CHECK_CALL(vtkm::exec::ParametricCoordinatesCenter(numPoints, shape, pcoords));
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CompareCoordinates(pointWCoords, pcoords, wcoords, shape);
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}
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}
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template <typename PointWCoordsType, typename CellShapeTag>
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void TestPCoordsSample(const PointWCoordsType& pointWCoords, CellShapeTag shape)
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{
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using Vector3 = typename PointWCoordsType::ComponentType;
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const vtkm::IdComponent numPoints = pointWCoords.GetNumberOfComponents();
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std::uniform_real_distribution<vtkm::FloatDefault> randomDist;
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for (vtkm::IdComponent trial = 0; trial < 5; trial++)
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{
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// Generate a random pcoords that we know is in the cell.
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vtkm::Vec3f pcoords(0);
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vtkm::FloatDefault totalWeight = 0;
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for (vtkm::IdComponent pointIndex = 0; pointIndex < numPoints; pointIndex++)
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{
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vtkm::Vec3f pointPcoords;
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CHECK_CALL(
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vtkm::exec::ParametricCoordinatesPoint(numPoints, pointIndex, shape, pointPcoords));
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vtkm::FloatDefault weight = randomDist(g_RandomGenerator);
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pcoords = pcoords + weight * pointPcoords;
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totalWeight += weight;
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}
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pcoords = (1 / totalWeight) * pcoords;
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// If you convert to world coordinates and back, you should get the
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// same value.
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Vector3 wcoords;
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CHECK_CALL(
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vtkm::exec::ParametricCoordinatesToWorldCoordinates(pointWCoords, pcoords, shape, wcoords));
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Vector3 computedPCoords;
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CHECK_CALL(vtkm::exec::WorldCoordinatesToParametricCoordinates(
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pointWCoords, wcoords, shape, computedPCoords));
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VTKM_TEST_ASSERT(test_equal(pcoords, computedPCoords, 0.05),
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"pcoord/wcoord transform not symmetrical");
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}
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}
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template <typename PointWCoordsType, typename CellShellTag>
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static void TestPCoords(const PointWCoordsType& pointWCoords, CellShellTag shape)
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{
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TestPCoordsSpecial(pointWCoords, shape);
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TestPCoordsSample(pointWCoords, shape);
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}
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template <typename T>
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struct TestPCoordsFunctor
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{
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using Vector3 = vtkm::Vec<T, 3>;
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using PointWCoordType = vtkm::VecVariable<Vector3, MAX_POINTS>;
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template <typename CellShapeTag>
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PointWCoordType MakePointWCoords(CellShapeTag, vtkm::IdComponent numPoints) const
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{
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std::uniform_real_distribution<T> randomDist(-1, 1);
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Vector3 sheerVec(randomDist(g_RandomGenerator), randomDist(g_RandomGenerator), 0);
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PointWCoordType pointWCoords;
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for (vtkm::IdComponent pointIndex = 0; pointIndex < numPoints; pointIndex++)
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{
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Vector3 pcoords;
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CHECK_CALL(
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vtkm::exec::ParametricCoordinatesPoint(numPoints, pointIndex, CellShapeTag(), pcoords));
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Vector3 wCoords = Vector3(pcoords[0], pcoords[1], pcoords[2] + vtkm::Dot(pcoords, sheerVec));
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pointWCoords.Append(wCoords);
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}
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return pointWCoords;
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}
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template <typename CellShapeTag>
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void operator()(CellShapeTag) const
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{
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vtkm::IdComponent minPoints;
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vtkm::IdComponent maxPoints;
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GetMinMaxPoints(
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CellShapeTag(), typename vtkm::CellTraits<CellShapeTag>::IsSizeFixed(), minPoints, maxPoints);
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std::cout << "--- Test shape tag directly" << std::endl;
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for (vtkm::IdComponent numPoints = minPoints; numPoints <= maxPoints; numPoints++)
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{
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TestPCoords(this->MakePointWCoords(CellShapeTag(), numPoints), CellShapeTag());
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}
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std::cout << "--- Test generic shape tag" << std::endl;
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vtkm::CellShapeTagGeneric genericShape(CellShapeTag::Id);
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for (vtkm::IdComponent numPoints = minPoints; numPoints <= maxPoints; numPoints++)
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{
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TestPCoords(this->MakePointWCoords(CellShapeTag(), numPoints), genericShape);
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}
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}
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void operator()(vtkm::CellShapeTagEmpty) const
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{
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std::cout << "Skipping empty cell shape. No points." << std::endl;
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}
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};
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void TestAllPCoords()
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{
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vtkm::UInt32 seed = static_cast<vtkm::UInt32>(std::time(nullptr));
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std::cout << "Seed: " << seed << std::endl;
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g_RandomGenerator.seed(seed);
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std::cout << "======== Float32 ==========================" << std::endl;
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vtkm::testing::Testing::TryAllCellShapes(TestPCoordsFunctor<vtkm::Float32>());
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std::cout << "======== Float64 ==========================" << std::endl;
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vtkm::testing::Testing::TryAllCellShapes(TestPCoordsFunctor<vtkm::Float64>());
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std::cout << "======== Rectilinear Shapes ===============" << std::endl;
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std::uniform_real_distribution<vtkm::FloatDefault> randomDist(0.01f, 1.0f);
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vtkm::Vec3f origin(
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randomDist(g_RandomGenerator), randomDist(g_RandomGenerator), randomDist(g_RandomGenerator));
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vtkm::Vec3f spacing(
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randomDist(g_RandomGenerator), randomDist(g_RandomGenerator), randomDist(g_RandomGenerator));
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TestPCoords(vtkm::VecAxisAlignedPointCoordinates<3>(origin, spacing),
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vtkm::CellShapeTagHexahedron());
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TestPCoords(vtkm::VecAxisAlignedPointCoordinates<2>(origin, spacing), vtkm::CellShapeTagQuad());
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TestPCoords(vtkm::VecAxisAlignedPointCoordinates<1>(origin, spacing), vtkm::CellShapeTagLine());
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}
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} // Anonymous namespace
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int UnitTestParametricCoordinates(int argc, char* argv[])
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{
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return vtkm::testing::Testing::Run(TestAllPCoords, argc, argv);
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}
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