mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-19 18:45:43 +00:00
338 lines
13 KiB
C++
338 lines
13 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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// 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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// Copyright 2014 Sandia Corporation.
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// Copyright 2014 UT-Battelle, LLC.
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// Copyright 2014 Los Alamos National Security.
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//============================================================================
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#ifndef vtk_m_worklet_MarchingCubes_h
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#define vtk_m_worklet_MarchingCubes_h
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#include <vtkm/VectorAnalysis.h>
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#include <vtkm/exec/CellDerivative.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/ArrayHandleCompositeVector.h>
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#include <vtkm/cont/ArrayHandleGroupVec.h>
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#include <vtkm/cont/ArrayHandleIndex.h>
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#include <vtkm/cont/ArrayHandlePermutation.h>
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#include <vtkm/cont/DataSet.h>
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#include <vtkm/cont/DeviceAdapter.h>
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#include <vtkm/cont/DynamicArrayHandle.h>
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#include <vtkm/cont/Field.h>
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#include <vtkm/worklet/DispatcherMapTopology.h>
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#include <vtkm/worklet/ScatterCounting.h>
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#include <vtkm/worklet/WorkletMapTopology.h>
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#include <vtkm/worklet/MarchingCubesDataTables.h>
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namespace vtkm {
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namespace worklet {
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/// \brief Compute the isosurface for a uniform grid data set
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template <typename FieldType, typename DeviceAdapter>
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class MarchingCubes
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{
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public:
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typedef vtkm::cont::ArrayHandle<FieldType> WeightHandle;
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typedef vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Id,2> > IdPairHandle;
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class ClassifyCell : public vtkm::worklet::WorkletMapPointToCell
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{
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public:
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typedef void ControlSignature(
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FieldInPoint<Scalar> inNodes,
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TopologyIn topology,
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FieldOutCell<> outNumTriangles,
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WholeArrayIn<IdComponentType> numTrianglesTable);
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typedef void ExecutionSignature(_1, _3, _4);
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typedef _2 InputDomain;
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FieldType Isovalue;
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VTKM_CONT_EXPORT
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ClassifyCell(FieldType isovalue) :
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Isovalue(isovalue)
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{
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}
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template<typename InPointVecType,
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typename NumTrianglesTablePortalType>
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VTKM_EXEC_EXPORT
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void operator()(const InPointVecType &fieldIn,
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vtkm::IdComponent &numTriangles,
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const NumTrianglesTablePortalType &numTrianglesTable) const
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{
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vtkm::IdComponent caseNumber =
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( (fieldIn[0] > this->Isovalue)
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| (fieldIn[1] > this->Isovalue)<<1
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| (fieldIn[2] > this->Isovalue)<<2
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| (fieldIn[3] > this->Isovalue)<<3
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| (fieldIn[4] > this->Isovalue)<<4
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| (fieldIn[5] > this->Isovalue)<<5
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| (fieldIn[6] > this->Isovalue)<<6
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| (fieldIn[7] > this->Isovalue)<<7 );
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numTriangles = numTrianglesTable.Get(caseNumber);
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}
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};
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/// \brief Compute isosurface vertices and scalars
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class IsosurfaceGenerate : public vtkm::worklet::WorkletMapPointToCell
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{
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typedef vtkm::Vec< vtkm::Id2,3 > Vec3Id2;
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typedef vtkm::Vec< vtkm::Vec<vtkm::Float32,3>, 3 > Vec3FVec3;
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typedef vtkm::Vec< vtkm::Vec<vtkm::Float64,3>, 3 > Vec3DVec3;
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public:
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struct InterpolateIdTypes : vtkm::ListTagBase< Vec3Id2 > { };
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struct Vec3FloatTypes : vtkm::ListTagBase< Vec3FVec3, Vec3DVec3> { };
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typedef typename vtkm::cont::ArrayHandle<vtkm::IdComponent>::
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ExecutionTypes<DeviceAdapter>::PortalConst IdPortalConstType;
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IdPortalConstType EdgeTable;
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typedef void ControlSignature(
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TopologyIn topology, // Cell set
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FieldInPoint<Scalar> fieldIn, // Input point field defining the contour
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FieldInPoint<Vec3> pcoordIn, // Input point coordinates
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FieldOutCell<Vec3> interpolationWeights,
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FieldOutCell<InterpolateIdTypes> interpolationIds,
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FieldOutCell<Vec3FloatTypes> vertexOut, // Vertices for output triangles
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FieldOutCell<Vec3FloatTypes> normalsOut, // Estimated normals (one per tri vertex)
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WholeArrayIn<IdComponentType> TriTable // An array portal with the triangle table
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);
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typedef void ExecutionSignature(
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CellShape, _2, _3, _4, _5, _6, _7, _8, VisitIndex, FromIndices);
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typedef vtkm::worklet::ScatterCounting ScatterType;
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VTKM_CONT_EXPORT
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ScatterType GetScatter() const
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{
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return this->Scatter;
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}
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VTKM_CONT_EXPORT
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IsosurfaceGenerate(FieldType isovalue,
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bool generateNormals,
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const vtkm::worklet::ScatterCounting& scatter,
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IdPortalConstType edgeTable) : EdgeTable(edgeTable),
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Isovalue(isovalue),
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GenerateNormals(generateNormals),
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Scatter(scatter) { }
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template<typename CellShapeTag,
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typename FieldInType, // Vec-like, one per input point
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typename CoordType, // Vec-like (one per input point) of Vec-3
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typename WeightType,
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typename IdType,
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typename VertexOutType, // Vec-3 of Vec-3 coords (for triangle)
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typename NormalOutType, // Vec-3 of Vec-3
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typename TriTablePortalType, // Array portal
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typename IndicesVecType>
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VTKM_EXEC_EXPORT
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void operator()(
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CellShapeTag shape,
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const FieldInType &fieldIn, // Input point field defining the contour
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const CoordType &coords, // Input point coordinates
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WeightType &interpolationWeights,
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IdType &interpolationIds,
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VertexOutType &vertexOut, // Vertices for output triangles
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NormalOutType &normalsOut, // Estimated normals (one per tri vertex)
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const TriTablePortalType &triTable, // An array portal with the triangle table
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vtkm::IdComponent visitIndex,
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const IndicesVecType &indices) const
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{
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// Compute the Marching Cubes case number for this cell
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vtkm::IdComponent caseNumber =
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( (fieldIn[0] > this->Isovalue)
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| (fieldIn[1] > this->Isovalue)<<1
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| (fieldIn[2] > this->Isovalue)<<2
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| (fieldIn[3] > this->Isovalue)<<3
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| (fieldIn[4] > this->Isovalue)<<4
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| (fieldIn[5] > this->Isovalue)<<5
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| (fieldIn[6] > this->Isovalue)<<6
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| (fieldIn[7] > this->Isovalue)<<7 );
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// Interpolate for vertex positions and associated scalar values
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const vtkm::Id triTableOffset =
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static_cast<vtkm::Id>(caseNumber*16 + visitIndex*3);
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for (vtkm::IdComponent triVertex = 0; triVertex < 3; triVertex++)
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{
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const vtkm::IdComponent edgeIndex =
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triTable.Get(triTableOffset + triVertex);
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const vtkm::IdComponent edgeVertex0 =
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this->EdgeTable.Get(2*edgeIndex + 0);
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const vtkm::IdComponent edgeVertex1 =
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this->EdgeTable.Get(2*edgeIndex + 1);
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const FieldType fieldValue0 = fieldIn[edgeVertex0];
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const FieldType fieldValue1 = fieldIn[edgeVertex1];
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const FieldType interpolant =
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(this->Isovalue - fieldValue0) / (fieldValue1 - fieldValue0);
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vertexOut[triVertex] = vtkm::Lerp(coords[edgeVertex0],
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coords[edgeVertex1],
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interpolant);
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interpolationIds[triVertex][0] = indices[edgeVertex0];
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interpolationIds[triVertex][1] = indices[edgeVertex1];
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interpolationWeights[triVertex] = interpolant;
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//conditionally do these only if we want to generate normals
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if(this->GenerateNormals)
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{
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const vtkm::Vec<vtkm::FloatDefault,3> edgePCoord0 =
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vtkm::exec::ParametricCoordinatesPoint(
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fieldIn.GetNumberOfComponents(), edgeVertex0, shape, *this);
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const vtkm::Vec<vtkm::FloatDefault,3> edgePCoord1 =
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vtkm::exec::ParametricCoordinatesPoint(
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fieldIn.GetNumberOfComponents(), edgeVertex1, shape, *this);
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const vtkm::Vec<vtkm::FloatDefault,3> interpPCoord =
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vtkm::Lerp(edgePCoord0, edgePCoord1, interpolant);
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normalsOut[triVertex] =
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vtkm::Normal(vtkm::exec::CellDerivative(
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fieldIn, coords, interpPCoord, shape, *this));
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}
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}
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}
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private:
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const FieldType Isovalue;
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bool GenerateNormals;
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ScatterType Scatter;
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};
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class ApplyToField : public vtkm::worklet::WorkletMapField
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{
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public:
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typedef void ControlSignature(FieldIn<Scalar> interpolationLow,
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FieldIn<Scalar> interpolationHigh,
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FieldIn<Scalar> interpolationWeight,
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FieldOut<Scalar> interpolatedOutput);
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typedef void ExecutionSignature(_1, _2, _3, _4);
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typedef _1 InputDomain;
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VTKM_CONT_EXPORT
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ApplyToField() {}
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template <typename Field>
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VTKM_EXEC_EXPORT
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void operator()(const Field& low,
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const Field& high,
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const FieldType &weight,
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Field &result) const
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{
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result = vtkm::Lerp(low, high, weight);
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}
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};
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MarchingCubes() {}
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template<typename CellSetType,typename StorageTagField,typename StorageTagVertices,typename StorageTagNormals, typename CoordinateType>
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void Run(const float &isovalue,
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const CellSetType& cellSet,
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const vtkm::cont::CoordinateSystem& coordinateSystem,
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const vtkm::cont::ArrayHandle<FieldType, StorageTagField>& field,
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vtkm::cont::ArrayHandle< vtkm::Vec<CoordinateType,3>, StorageTagVertices > vertices,
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vtkm::cont::ArrayHandle< vtkm::Vec<CoordinateType,3>, StorageTagNormals > normals)
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{
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// Set up the Marching Cubes case tables
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vtkm::cont::ArrayHandle<vtkm::IdComponent> edgeTable =
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vtkm::cont::make_ArrayHandle(vtkm::worklet::internal::edgeTable,
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24);
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vtkm::cont::ArrayHandle<vtkm::IdComponent> numTrianglesTable =
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vtkm::cont::make_ArrayHandle(vtkm::worklet::internal::numTrianglesTable,
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256);
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vtkm::cont::ArrayHandle<vtkm::IdComponent> triangleTableArray =
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vtkm::cont::make_ArrayHandle(vtkm::worklet::internal::triTable,
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256*16);
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vtkm::cont::ArrayHandle<vtkm::IdComponent> numOutputTrisPerCell;
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// Call the ClassifyCell functor to compute the Marching Cubes case numbers
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// for each cell, and the number of vertices to be generated
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ClassifyCell classifyCell(isovalue);
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typedef typename vtkm::worklet::DispatcherMapTopology<
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ClassifyCell,
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DeviceAdapter> ClassifyCellDispatcher;
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ClassifyCellDispatcher classifyCellDispatcher(classifyCell);
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classifyCellDispatcher.Invoke(field,
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cellSet,
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numOutputTrisPerCell,
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numTrianglesTable);
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vtkm::worklet::ScatterCounting scatter(numOutputTrisPerCell, DeviceAdapter());
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IsosurfaceGenerate isosurface(isovalue,
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true, //always generate normals.
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scatter,
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edgeTable.PrepareForInput(DeviceAdapter()));
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vtkm::worklet::DispatcherMapTopology<IsosurfaceGenerate, DeviceAdapter>
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isosurfaceDispatcher(isosurface);
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isosurfaceDispatcher.Invoke(
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cellSet,
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field,
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coordinateSystem.GetData(),
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vtkm::cont::make_ArrayHandleGroupVec<3>(this->InterpolationWeights),
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vtkm::cont::make_ArrayHandleGroupVec<3>(this->InterpolationIds),
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vtkm::cont::make_ArrayHandleGroupVec<3>(vertices),
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vtkm::cont::make_ArrayHandleGroupVec<3>(normals),
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triangleTableArray);
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}
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template<typename ArrayHandleIn, typename ArrayHandleOut>
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void MapFieldOntoIsosurface(const ArrayHandleIn& fieldIn,
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ArrayHandleOut& fieldOut)
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{
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typedef typename vtkm::cont::ArrayHandleCompositeVectorType<IdPairHandle>
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::type IdType;
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typedef vtkm::cont::ArrayHandlePermutation<IdType,ArrayHandleIn>
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FieldPermutationHandleType;
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FieldPermutationHandleType
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low(vtkm::cont::make_ArrayHandleCompositeVector(this->InterpolationIds,
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0),fieldIn);
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FieldPermutationHandleType
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high(vtkm::cont::make_ArrayHandleCompositeVector(this->InterpolationIds,
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1),fieldIn);
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ApplyToField applyToField;
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vtkm::worklet::DispatcherMapField<ApplyToField,DeviceAdapter>
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applyToFieldDispatcher(applyToField);
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applyToFieldDispatcher.Invoke(low,
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high,
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this->InterpolationWeights,
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fieldOut);
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}
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private:
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WeightHandle InterpolationWeights;
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IdPairHandle InterpolationIds;
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};
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}
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} // namespace vtkm::worklet
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#endif // vtk_m_worklet_MarchingCubes_h
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