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237 lines
8.9 KiB
C++
237 lines
8.9 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_PointLocatorSparseGrid_h
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#define vtk_m_exec_PointLocatorSparseGrid_h
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#include <vtkm/cont/CoordinateSystem.h>
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#include <vtkm/Deprecated.h>
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#include <vtkm/VectorAnalysis.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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class VTKM_ALWAYS_EXPORT PointLocatorSparseGrid
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{
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public:
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using CoordPortalType =
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typename vtkm::cont::CoordinateSystem::MultiplexerArrayType::ReadPortalType;
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using IdPortalType = typename vtkm::cont::ArrayHandle<vtkm::Id>::ReadPortalType;
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PointLocatorSparseGrid(const vtkm::Vec3f& min,
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const vtkm::Vec3f& max,
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const vtkm::Id3& dims,
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const CoordPortalType& coords,
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const IdPortalType& pointIds,
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const IdPortalType& cellLower,
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const IdPortalType& cellUpper)
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: Min(min)
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, Dims(dims)
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, Dxdydz((max - Min) / Dims)
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, Coords(coords)
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, PointIds(pointIds)
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, CellLower(cellLower)
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, CellUpper(cellUpper)
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{
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}
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/// \brief Nearest neighbor search using a Uniform Grid
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///
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/// Parallel search of nearesat neighbor for each point in the \c queryPoints in the set of
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/// \c coords. Returns neareast neighbot in \c nearestNeighborIds and distances to nearest
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/// neighbor in \c distances.
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///
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/// \param queryPoint Point coordinates to query for nearest neighbor.
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/// \param nearestNeighborId Neareast neighbor in the training dataset for each points in
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/// the test set
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/// \param distance2 Squared distance between query points and their nearest neighbors.
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VTKM_EXEC void FindNearestNeighbor(const vtkm::Vec3f& queryPoint,
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vtkm::Id& nearestNeighborId,
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vtkm::FloatDefault& distance2) const
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{
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//std::cout << "FindNeareastNeighbor: " << queryPoint << std::endl;
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vtkm::Id3 ijk = (queryPoint - this->Min) / this->Dxdydz;
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ijk = vtkm::Max(ijk, vtkm::Id3(0));
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ijk = vtkm::Min(ijk, this->Dims - vtkm::Id3(1));
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nearestNeighborId = -1;
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distance2 = vtkm::Infinity<vtkm::FloatDefault>();
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this->FindInCell(queryPoint, ijk, nearestNeighborId, distance2);
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// TODO: This might stop looking before the absolute nearest neighbor is found.
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vtkm::Id maxLevel = vtkm::Max(vtkm::Max(this->Dims[0], this->Dims[1]), this->Dims[2]);
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vtkm::Id level;
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for (level = 1; (nearestNeighborId < 0) && (level < maxLevel); ++level)
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{
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this->FindInBox(queryPoint, ijk, level, nearestNeighborId, distance2);
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}
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// Search one more level out. This is still not guaranteed to find the closest point
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// in all cases (past level 2), but it will catch most cases where the closest point
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// is just on the other side of a cell boundary.
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this->FindInBox(queryPoint, ijk, level, nearestNeighborId, distance2);
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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 PointLocatorSparseGrid* 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 PointLocatorSparseGrid* operator->() const { return this; }
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private:
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vtkm::Vec3f Min;
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vtkm::Id3 Dims;
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vtkm::Vec3f Dxdydz;
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CoordPortalType Coords;
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IdPortalType PointIds;
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IdPortalType CellLower;
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IdPortalType CellUpper;
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VTKM_EXEC void FindInCell(const vtkm::Vec3f& queryPoint,
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const vtkm::Id3& ijk,
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vtkm::Id& nearestNeighborId,
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vtkm::FloatDefault& nearestDistance2) const
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{
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vtkm::Id cellId = ijk[0] + (ijk[1] * this->Dims[0]) + (ijk[2] * this->Dims[0] * this->Dims[1]);
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vtkm::Id lower = this->CellLower.Get(cellId);
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vtkm::Id upper = this->CellUpper.Get(cellId);
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for (vtkm::Id index = lower; index < upper; index++)
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{
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vtkm::Id pointid = this->PointIds.Get(index);
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vtkm::Vec3f point = this->Coords.Get(pointid);
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vtkm::FloatDefault distance2 = vtkm::MagnitudeSquared(point - queryPoint);
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if (distance2 < nearestDistance2)
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{
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nearestNeighborId = pointid;
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nearestDistance2 = distance2;
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}
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}
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}
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VTKM_EXEC void FindInBox(const vtkm::Vec3f& queryPoint,
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const vtkm::Id3& boxCenter,
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vtkm::Id level,
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vtkm::Id& nearestNeighborId,
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vtkm::FloatDefault& nearestDistance2) const
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{
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if ((boxCenter[0] - level) >= 0)
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{
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this->FindInXPlane(
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queryPoint, boxCenter - vtkm::Id3(level, 0, 0), level, nearestNeighborId, nearestDistance2);
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}
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if ((boxCenter[0] + level) < this->Dims[0])
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{
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this->FindInXPlane(
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queryPoint, boxCenter + vtkm::Id3(level, 0, 0), level, nearestNeighborId, nearestDistance2);
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}
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if ((boxCenter[1] - level) >= 0)
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{
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this->FindInYPlane(
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queryPoint, boxCenter - vtkm::Id3(0, level, 0), level, nearestNeighborId, nearestDistance2);
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}
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if ((boxCenter[1] + level) < this->Dims[1])
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{
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this->FindInYPlane(
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queryPoint, boxCenter + vtkm::Id3(0, level, 0), level, nearestNeighborId, nearestDistance2);
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}
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if ((boxCenter[2] - level) >= 0)
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{
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this->FindInZPlane(
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queryPoint, boxCenter - vtkm::Id3(0, 0, level), level, nearestNeighborId, nearestDistance2);
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}
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if ((boxCenter[2] + level) < this->Dims[2])
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{
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this->FindInZPlane(
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queryPoint, boxCenter + vtkm::Id3(0, 0, level), level, nearestNeighborId, nearestDistance2);
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}
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}
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VTKM_EXEC void FindInPlane(const vtkm::Vec3f& queryPoint,
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const vtkm::Id3& planeCenter,
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const vtkm::Id3& div,
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const vtkm::Id3& mod,
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const vtkm::Id3& origin,
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vtkm::Id numInPlane,
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vtkm::Id& nearestNeighborId,
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vtkm::FloatDefault& nearestDistance2) const
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{
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for (vtkm::Id index = 0; index < numInPlane; ++index)
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{
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vtkm::Id3 ijk = planeCenter + vtkm::Id3(index) / div +
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vtkm::Id3(index % mod[0], index % mod[1], index % mod[2]) + origin;
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if ((ijk[0] >= 0) && (ijk[0] < this->Dims[0]) && (ijk[1] >= 0) && (ijk[1] < this->Dims[1]) &&
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(ijk[2] >= 0) && (ijk[2] < this->Dims[2]))
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{
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this->FindInCell(queryPoint, ijk, nearestNeighborId, nearestDistance2);
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}
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}
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}
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VTKM_EXEC void FindInXPlane(const vtkm::Vec3f& queryPoint,
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const vtkm::Id3& planeCenter,
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vtkm::Id level,
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vtkm::Id& nearestNeighborId,
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vtkm::FloatDefault& nearestDistance2) const
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{
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vtkm::Id yWidth = (2 * level) + 1;
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vtkm::Id zWidth = (2 * level) + 1;
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vtkm::Id3 div = { yWidth * zWidth, yWidth * zWidth, yWidth };
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vtkm::Id3 mod = { 1, yWidth, 1 };
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vtkm::Id3 origin = { 0, -level, -level };
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vtkm::Id numInPlane = yWidth * zWidth;
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this->FindInPlane(
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queryPoint, planeCenter, div, mod, origin, numInPlane, nearestNeighborId, nearestDistance2);
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}
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VTKM_EXEC void FindInYPlane(const vtkm::Vec3f& queryPoint,
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vtkm::Id3 planeCenter,
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vtkm::Id level,
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vtkm::Id& nearestNeighborId,
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vtkm::FloatDefault& nearestDistance2) const
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{
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vtkm::Id xWidth = (2 * level) - 1;
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vtkm::Id zWidth = (2 * level) + 1;
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vtkm::Id3 div = { xWidth * zWidth, xWidth * zWidth, xWidth };
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vtkm::Id3 mod = { xWidth, 1, 1 };
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vtkm::Id3 origin = { -level + 1, 0, -level };
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vtkm::Id numInPlane = xWidth * zWidth;
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this->FindInPlane(
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queryPoint, planeCenter, div, mod, origin, numInPlane, nearestNeighborId, nearestDistance2);
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}
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VTKM_EXEC void FindInZPlane(const vtkm::Vec3f& queryPoint,
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vtkm::Id3 planeCenter,
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vtkm::Id level,
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vtkm::Id& nearestNeighborId,
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vtkm::FloatDefault& nearestDistance2) const
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{
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vtkm::Id xWidth = (2 * level) - 1;
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vtkm::Id yWidth = (2 * level) - 1;
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vtkm::Id3 div = { xWidth * yWidth, xWidth, xWidth * yWidth };
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vtkm::Id3 mod = { xWidth, 1, 1 };
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vtkm::Id3 origin = { -level + 1, -level + 1, 0 };
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vtkm::Id numInPlane = xWidth * yWidth;
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this->FindInPlane(
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queryPoint, planeCenter, div, mod, origin, numInPlane, nearestNeighborId, nearestDistance2);
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}
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};
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} // vtkm::exec
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} // vtkm
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#endif // vtk_m_exec_PointLocatorSparseGrid_h
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