mirror of
https://gitlab.kitware.com/vtk/vtk-m
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299 lines
9.1 KiB
C++
299 lines
9.1 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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#ifndef vtk_m_exec_CellLocatorUniformBins_h
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#define vtk_m_exec_CellLocatorUniformBins_h
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#include <vtkm/exec/CellInside.h>
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#include <vtkm/exec/ParametricCoordinates.h>
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#include <vtkm/cont/ArrayHandle.h>
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#include <vtkm/cont/CoordinateSystem.h>
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#include <vtkm/TopologyElementTag.h>
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#include <vtkm/VecFromPortalPermute.h>
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#include <vtkm/VecTraits.h>
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namespace vtkm
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{
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namespace exec
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{
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//--------------------------------------------------------------------
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template <typename CellStructureType>
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class VTKM_ALWAYS_EXPORT CellLocatorUniformBins
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{
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template <typename T>
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using ReadPortal = typename vtkm::cont::ArrayHandle<T>::ReadPortalType;
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using CoordsPortalType =
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typename vtkm::cont::CoordinateSystem::MultiplexerArrayType::ReadPortalType;
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using CellIdArrayType = vtkm::cont::ArrayHandle<vtkm::Id>;
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using CellIdOffsetArrayType = vtkm::cont::ArrayHandle<vtkm::Id>;
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using CellIdReadPortal =
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typename vtkm::cont::ArrayHandleGroupVecVariable<CellIdArrayType,
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CellIdOffsetArrayType>::ReadPortalType;
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public:
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template <typename CellSetType>
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VTKM_CONT CellLocatorUniformBins(
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const vtkm::Id3& cellDims,
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const vtkm::Vec3f& origin,
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const vtkm::Vec3f& maxPoint,
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const vtkm::Vec3f& invSpacing,
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const vtkm::Id3& maxCellIds,
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const vtkm::cont::ArrayHandleGroupVecVariable<CellIdArrayType, CellIdOffsetArrayType>& cellIds,
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const CellSetType& cellSet,
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const vtkm::cont::CoordinateSystem& coords,
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vtkm::cont::DeviceAdapterId device,
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vtkm::cont::Token& token)
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: CellDims(cellDims)
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, Origin(origin)
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, MaxPoint(maxPoint)
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, InvSpacing(invSpacing)
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, MaxCellIds(maxCellIds)
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, CellIds(cellIds.PrepareForInput(device, token))
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, CellSet(cellSet.PrepareForInput(device,
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vtkm::TopologyElementTagCell{},
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vtkm::TopologyElementTagPoint{},
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token))
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, Coords(coords.GetDataAsMultiplexer().PrepareForInput(device, token))
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{
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}
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struct LastCell
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{
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vtkm::Id CellId = -1;
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vtkm::Id BinIdx = -1;
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};
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VTKM_EXEC
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vtkm::ErrorCode FindCell(const vtkm::Vec3f& point,
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vtkm::Id& cellId,
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vtkm::Vec3f& parametric) const
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{
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LastCell lastCell;
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return this->FindCellImpl(point, cellId, parametric, lastCell);
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}
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VTKM_EXEC
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vtkm::ErrorCode FindCell(const vtkm::Vec3f& point,
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vtkm::Id& cellId,
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vtkm::Vec3f& parametric,
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LastCell& lastCell) const
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{
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vtkm::Id binIdx = this->FindBinIdx(point);
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if (binIdx == -1)
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{
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lastCell.CellId = -1;
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lastCell.BinIdx = -1;
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cellId = -1;
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return vtkm::ErrorCode::CellNotFound;
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}
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//See if the point is still in the same bin.
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else if (binIdx == lastCell.BinIdx && this->LastCellValid(lastCell))
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{
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vtkm::Vec3f pc;
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//Check the last cell first.
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if (this->PointInCell(point, lastCell.CellId, pc))
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{
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parametric = pc;
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cellId = lastCell.CellId;
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return vtkm::ErrorCode::Success;
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}
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//Otherwise, check cells in the bin, but skip lastCell.CellId
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else if (this->PointInBin(point, lastCell.BinIdx, cellId, pc, lastCell.CellId))
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{
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parametric = pc;
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return vtkm::ErrorCode::Success;
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}
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}
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//if cell still not found, drop to the general find cell below.
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//LastCell not initialized, or not in the same bin: do a full test.
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//Since already computed the binIdx, re-use it.
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return this->FindCellImpl(point, cellId, parametric, lastCell, binIdx);
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}
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VTKM_DEPRECATED(1.6, "Locators are no longer pointers. Use . operator.")
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VTKM_EXEC CellLocatorUniformBins* operator->() { return this; }
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VTKM_DEPRECATED(1.6, "Locators are no longer pointers. Use . operator.")
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VTKM_EXEC const CellLocatorUniformBins* operator->() const { return this; }
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private:
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VTKM_EXEC vtkm::Id FindBinIdx(const vtkm::Vec3f& point) const
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{
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if (!this->IsInside(point))
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return -1;
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vtkm::Vec3f temp;
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temp = point - this->Origin;
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temp = temp * this->InvSpacing;
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//make sure that if we border the upper edge, we sample the correct cell
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vtkm::Id3 logicalCell = vtkm::Min(vtkm::Id3(temp), this->MaxCellIds);
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vtkm::Id binIdx =
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(logicalCell[2] * this->CellDims[1] + logicalCell[1]) * this->CellDims[0] + logicalCell[0];
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return binIdx;
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}
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VTKM_EXEC bool LastCellValid(const LastCell& lastCell) const
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{
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return lastCell.BinIdx >= 0 && lastCell.BinIdx < this->CellIds.GetNumberOfValues() &&
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lastCell.CellId >= 0 && lastCell.CellId < this->CellSet.GetNumberOfElements();
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}
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VTKM_EXEC bool IsInside(const vtkm::Vec3f& point) const
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{
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if (point[0] < this->Origin[0] || point[0] > this->MaxPoint[0])
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return false;
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if (point[1] < this->Origin[1] || point[1] > this->MaxPoint[1])
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return false;
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if (point[2] < this->Origin[2] || point[2] > this->MaxPoint[2])
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return false;
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return true;
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}
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VTKM_EXEC
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vtkm::ErrorCode FindCellImpl(const vtkm::Vec3f& point,
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vtkm::Id& cellId,
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vtkm::Vec3f& parametric,
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LastCell& lastCell,
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vtkm::Id ptBinIdx = -1) const
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{
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lastCell.CellId = -1;
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lastCell.BinIdx = -1;
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//if ptBinIdx is set, use it. Otherwise, compute the bin idx.
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vtkm::Id binIdx = -1;
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if (ptBinIdx == -1)
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binIdx = this->FindBinIdx(point);
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else
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binIdx = ptBinIdx;
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//point not in a bin. return not found.
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if (binIdx == -1)
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{
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cellId = -1;
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return vtkm::ErrorCode::CellNotFound;
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}
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//search cells in the bin.
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vtkm::Vec3f pc;
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if (this->PointInBin(point, binIdx, cellId, pc))
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{
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parametric = pc;
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lastCell.CellId = cellId;
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lastCell.BinIdx = binIdx;
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return vtkm::ErrorCode::Success;
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}
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return vtkm::ErrorCode::CellNotFound;
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}
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template <typename PointsVecType>
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VTKM_EXEC vtkm::Bounds ComputeCellBounds(const PointsVecType& points) const
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{
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auto numPoints = vtkm::VecTraits<PointsVecType>::GetNumberOfComponents(points);
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vtkm::Bounds bounds;
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for (vtkm::IdComponent i = 0; i < numPoints; ++i)
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bounds.Include(points[i]);
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return bounds;
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}
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// TODO: This function may return false positives for non 3D cells as the
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// tests are done on the projection of the point on the cell. Extra checks
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// should be added to test if the point actually falls on the cell.
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template <typename CellShapeTag, typename CoordsType>
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VTKM_EXEC vtkm::ErrorCode PointInsideCell(vtkm::Vec3f point,
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CellShapeTag cellShape,
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CoordsType cellPoints,
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vtkm::Vec3f& parametricCoordinates,
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bool& inside) const
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{
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auto bounds = this->ComputeCellBounds(cellPoints);
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if (bounds.Contains(point))
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{
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VTKM_RETURN_ON_ERROR(vtkm::exec::WorldCoordinatesToParametricCoordinates(
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cellPoints, point, cellShape, parametricCoordinates));
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inside = vtkm::exec::CellInside(parametricCoordinates, cellShape);
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}
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else
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{
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inside = false;
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}
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// Return success error code even point is not inside this cell
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return vtkm::ErrorCode::Success;
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}
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VTKM_EXEC
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bool PointInBin(const vtkm::Vec3f& point,
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const vtkm::Id& binIdx,
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vtkm::Id& cellId,
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vtkm::Vec3f& parametric,
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const vtkm::Id& skipCellId = -1) const
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{
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auto binIds = this->CellIds.Get(binIdx);
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vtkm::Vec3f pc;
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for (vtkm::IdComponent i = 0; i < binIds.GetNumberOfComponents(); i++)
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{
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vtkm::Id cid = binIds[i];
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if (cid != skipCellId && this->PointInCell(point, cid, pc))
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{
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cellId = cid;
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parametric = pc;
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return true;
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}
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}
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return false;
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}
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VTKM_EXEC
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bool PointInCell(const vtkm::Vec3f& point, const vtkm::Id& cid, vtkm::Vec3f& parametric) const
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{
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auto indices = this->CellSet.GetIndices(cid);
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auto pts = vtkm::make_VecFromPortalPermute(&indices, this->Coords);
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vtkm::Vec3f pc;
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bool inside;
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auto status = this->PointInsideCell(point, this->CellSet.GetCellShape(cid), pts, pc, inside);
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if (status == vtkm::ErrorCode::Success && inside)
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{
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parametric = pc;
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return true;
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}
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return false;
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}
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vtkm::Id3 CellDims;
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vtkm::Vec3f Origin;
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vtkm::Vec3f MaxPoint;
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vtkm::Vec3f InvSpacing;
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vtkm::Id3 MaxCellIds;
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CellIdReadPortal CellIds;
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CellStructureType CellSet;
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CoordsPortalType Coords;
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};
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}
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} // vtkm::exec
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#endif //vtk_m_exec_CellLocatorUniformBins_h
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