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QIDI TECH
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bundled_deps/libigl/igl/copyleft/marching_cubes.cpp
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258
bundled_deps/libigl/igl/copyleft/marching_cubes.cpp
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/*===========================================================================*\
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* *
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* IsoEx *
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* Copyright (C) 2002 by Computer Graphics Group, RWTH Aachen *
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* www.rwth-graphics.de *
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* *
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*---------------------------------------------------------------------------*
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* *
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* License *
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* *
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* This library is free software; you can redistribute it and/or modify it *
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* under the terms of the GNU Library General Public License as published *
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* by the Free Software Foundation, version 2. *
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* *
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* This library is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* Library General Public License for more details. *
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* *
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* You should have received a copy of the GNU Library General Public *
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* License along with this library; if not, write to the Free Software *
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
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* *
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\*===========================================================================*/
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#include "marching_cubes.h"
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#include "marching_cubes_tables.h"
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#include <unordered_map>
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extern const int edgeTable[256];
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extern const int triTable[256][2][17];
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extern const int polyTable[8][16];
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struct EdgeKey
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{
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EdgeKey(unsigned i0, unsigned i1) : i0_(i0), i1_(i1) {}
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bool operator==(const EdgeKey& _rhs) const
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{
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return i0_ == _rhs.i0_ && i1_ == _rhs.i1_;
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}
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unsigned i0_, i1_;
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};
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struct EdgeHash
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{
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std::size_t operator()(const EdgeKey& key) const {
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std::size_t seed = 0;
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seed ^= key.i0_ + 0x9e3779b9 + (seed<<6) + (seed>>2); // Copied from boost::hash_combine
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seed ^= key.i1_ + 0x9e3779b9 + (seed<<6) + (seed>>2);
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return std::hash<std::size_t>()(seed);
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}
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};
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template <typename Derivedvalues, typename Derivedpoints,typename Derivedvertices, typename DerivedF>
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class MarchingCubes
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{
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typedef std::unordered_map<EdgeKey, unsigned, EdgeHash> MyMap;
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typedef typename MyMap::const_iterator MyMapIterator;
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public:
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MarchingCubes(
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const Eigen::PlainObjectBase<Derivedvalues> &values,
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const Eigen::PlainObjectBase<Derivedpoints> &points,
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const unsigned x_res,
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const unsigned y_res,
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const unsigned z_res,
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Eigen::PlainObjectBase<Derivedvertices> &vertices,
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Eigen::PlainObjectBase<DerivedF> &faces)
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{
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assert(values.cols() == 1);
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assert(points.cols() == 3);
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if(x_res <2 || y_res<2 ||z_res<2)
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return;
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faces.resize(10000,3);
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int num_faces = 0;
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vertices.resize(10000,3);
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int num_vertices = 0;
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unsigned n_cubes = (x_res-1) * (y_res-1) * (z_res-1);
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assert(unsigned(points.rows()) == x_res * y_res * z_res);
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unsigned int offsets_[8];
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offsets_[0] = 0;
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offsets_[1] = 1;
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offsets_[2] = 1 + x_res;
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offsets_[3] = x_res;
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offsets_[4] = x_res*y_res;
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offsets_[5] = 1 + x_res*y_res;
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offsets_[6] = 1 + x_res + x_res*y_res;
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offsets_[7] = x_res + x_res*y_res;
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for (unsigned cube_it =0 ; cube_it < n_cubes; ++cube_it)
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{
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unsigned corner[8];
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typename DerivedF::Scalar samples[12];
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unsigned char cubetype(0);
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unsigned int i;
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// get point indices of corner vertices
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for (i=0; i<8; ++i)
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{
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// get cube coordinates
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unsigned int _idx = cube_it;
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unsigned int X(x_res-1), Y(y_res-1);
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unsigned int x = _idx % X; _idx /= X;
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unsigned int y = _idx % Y; _idx /= Y;
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unsigned int z = _idx;
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// transform to point coordinates
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_idx = x + y*x_res + z*x_res*y_res;
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// add offset
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corner[i] = _idx + offsets_[i];
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}
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// determine cube type
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for (i=0; i<8; ++i)
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if (values(corner[i]) > 0.0)
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cubetype |= (1<<i);
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// trivial reject ?
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if (cubetype == 0 || cubetype == 255)
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continue;
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// compute samples on cube's edges
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if (edgeTable[cubetype]&1)
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samples[0] = add_vertex(values, points, corner[0], corner[1], vertices, num_vertices, edge2vertex);
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if (edgeTable[cubetype]&2)
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samples[1] = add_vertex(values, points, corner[1], corner[2], vertices, num_vertices, edge2vertex);
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if (edgeTable[cubetype]&4)
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samples[2] = add_vertex(values, points, corner[3], corner[2], vertices, num_vertices, edge2vertex);
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if (edgeTable[cubetype]&8)
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samples[3] = add_vertex(values, points, corner[0], corner[3], vertices, num_vertices, edge2vertex);
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if (edgeTable[cubetype]&16)
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samples[4] = add_vertex(values, points, corner[4], corner[5], vertices, num_vertices, edge2vertex);
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if (edgeTable[cubetype]&32)
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samples[5] = add_vertex(values, points, corner[5], corner[6], vertices, num_vertices, edge2vertex);
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if (edgeTable[cubetype]&64)
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samples[6] = add_vertex(values, points, corner[7], corner[6], vertices, num_vertices, edge2vertex);
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if (edgeTable[cubetype]&128)
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samples[7] = add_vertex(values, points, corner[4], corner[7], vertices, num_vertices, edge2vertex);
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if (edgeTable[cubetype]&256)
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samples[8] = add_vertex(values, points, corner[0], corner[4], vertices, num_vertices, edge2vertex);
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if (edgeTable[cubetype]&512)
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samples[9] = add_vertex(values, points, corner[1], corner[5], vertices, num_vertices, edge2vertex);
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if (edgeTable[cubetype]&1024)
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samples[10] = add_vertex(values, points, corner[2], corner[6], vertices, num_vertices, edge2vertex);
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if (edgeTable[cubetype]&2048)
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samples[11] = add_vertex(values, points, corner[3], corner[7], vertices, num_vertices, edge2vertex);
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// connect samples by triangles
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for (i=0; triTable[cubetype][0][i] != -1; i+=3 )
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{
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num_faces++;
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if (num_faces > faces.rows())
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faces.conservativeResize(faces.rows()+10000, Eigen::NoChange);
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faces.row(num_faces-1) <<
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samples[triTable[cubetype][0][i ]],
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samples[triTable[cubetype][0][i+1]],
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samples[triTable[cubetype][0][i+2]];
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}
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}
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vertices.conservativeResize(num_vertices, Eigen::NoChange);
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faces.conservativeResize(num_faces, Eigen::NoChange);
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};
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static typename DerivedF::Scalar add_vertex(const Eigen::PlainObjectBase<Derivedvalues> &values,
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const Eigen::PlainObjectBase<Derivedpoints> &points,
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unsigned int i0,
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unsigned int i1,
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Eigen::PlainObjectBase<Derivedvertices> &vertices,
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int &num_vertices,
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MyMap &edge2vertex)
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{
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// find vertex if it has been computed already
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MyMapIterator it = edge2vertex.find(EdgeKey(i0, i1));
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if (it != edge2vertex.end())
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return it->second;
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;
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// generate new vertex
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const Eigen::Matrix<typename Derivedpoints::Scalar, 1, 3> & p0 = points.row(i0);
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const Eigen::Matrix<typename Derivedpoints::Scalar, 1, 3> & p1 = points.row(i1);
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typename Derivedvalues::Scalar s0 = fabs(values(i0));
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typename Derivedvalues::Scalar s1 = fabs(values(i1));
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typename Derivedvalues::Scalar t = s0 / (s0+s1);
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num_vertices++;
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if (num_vertices > vertices.rows())
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vertices.conservativeResize(vertices.rows()+10000, Eigen::NoChange);
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// Linear interpolation based on linearly interpolating values
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vertices.row(num_vertices-1) = ((1.0f-t)*p0 + t*p1).template cast<typename Derivedvertices::Scalar>();
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edge2vertex[EdgeKey(i0, i1)] = num_vertices-1;
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return num_vertices-1;
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}
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;
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// maps an edge to the sample vertex generated on it
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MyMap edge2vertex;
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};
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template <typename Derivedvalues, typename Derivedpoints, typename Derivedvertices, typename DerivedF>
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IGL_INLINE void igl::copyleft::marching_cubes(
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const Eigen::PlainObjectBase<Derivedvalues> &values,
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const Eigen::PlainObjectBase<Derivedpoints> &points,
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const unsigned x_res,
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const unsigned y_res,
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const unsigned z_res,
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Eigen::PlainObjectBase<Derivedvertices> &vertices,
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Eigen::PlainObjectBase<DerivedF> &faces)
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{
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MarchingCubes<Derivedvalues, Derivedpoints, Derivedvertices, DerivedF> mc(values,
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points,
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x_res,
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y_res,
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z_res,
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vertices,
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faces);
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}
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#ifdef IGL_STATIC_LIBRARY
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// Explicit template instantiation
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// generated by autoexplicit.sh
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template void igl::copyleft::marching_cubes<Eigen::Matrix<double, -1, 1, 0, -1, 1>, Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<double, -1, 3, 1, -1, 3>, Eigen::Matrix<int, -1, 3, 1, -1, 3> >(Eigen::PlainObjectBase<Eigen::Matrix<double, -1, 1, 0, -1, 1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, unsigned int, unsigned int, unsigned int, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, 3, 1, -1, 3> >&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 3, 1, -1, 3> >&);
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// generated by autoexplicit.sh
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template void igl::copyleft::marching_cubes<Eigen::Matrix<float, -1, 1, 0, -1, 1>, Eigen::Matrix<float, -1, 3, 0, -1, 3>, Eigen::Matrix<float, -1, 3, 0, -1, 3>, Eigen::Matrix<int, -1, 3, 0, -1, 3> >(Eigen::PlainObjectBase<Eigen::Matrix<float, -1, 1, 0, -1, 1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<float, -1, 3, 0, -1, 3> > const&, unsigned int, unsigned int, unsigned int, Eigen::PlainObjectBase<Eigen::Matrix<float, -1, 3, 0, -1, 3> >&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 3, 0, -1, 3> >&);
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// generated by autoexplicit.sh
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template void igl::copyleft::marching_cubes<Eigen::Matrix<float, -1, 1, 0, -1, 1>, Eigen::Matrix<float, -1, 3, 1, -1, 3>, Eigen::Matrix<float, -1, 3, 1, -1, 3>, Eigen::Matrix<int, -1, 3, 1, -1, 3> >(Eigen::PlainObjectBase<Eigen::Matrix<float, -1, 1, 0, -1, 1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<float, -1, 3, 1, -1, 3> > const&, unsigned int, unsigned int, unsigned int, Eigen::PlainObjectBase<Eigen::Matrix<float, -1, 3, 1, -1, 3> >&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 3, 1, -1, 3> >&);
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// generated by autoexplicit.sh
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template void igl::copyleft::marching_cubes<Eigen::Matrix<float, -1, 1, 0, -1, 1>, Eigen::Matrix<float, -1, -1, 0, -1, -1>, Eigen::Matrix<float, -1, 3, 1, -1, 3>, Eigen::Matrix<int, -1, 3, 1, -1, 3> >(Eigen::PlainObjectBase<Eigen::Matrix<float, -1, 1, 0, -1, 1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<float, -1, -1, 0, -1, -1> > const&, unsigned int, unsigned int, unsigned int, Eigen::PlainObjectBase<Eigen::Matrix<float, -1, 3, 1, -1, 3> >&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 3, 1, -1, 3> >&);
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// generated by autoexplicit.sh
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template void igl::copyleft::marching_cubes<Eigen::Matrix<double, -1, 1, 0, -1, 1>, Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<float, -1, 3, 1, -1, 3>, Eigen::Matrix<int, -1, 3, 1, -1, 3> >(Eigen::PlainObjectBase<Eigen::Matrix<double, -1, 1, 0, -1, 1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, unsigned int, unsigned int, unsigned int, Eigen::PlainObjectBase<Eigen::Matrix<float, -1, 3, 1, -1, 3> >&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 3, 1, -1, 3> >&);
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template void igl::copyleft::marching_cubes< Eigen::Matrix<double, -1, 1, 0, -1, 1>, Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1> >(Eigen::PlainObjectBase<Eigen::Matrix<double, -1, 1, 0, -1, 1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, unsigned int, unsigned int, unsigned int, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> >&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> >&);
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#endif
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