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MeshBooleans with CGAL only

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tamasmeszaros 2020-01-16 13:20:17 +01:00
parent 79e546816d
commit fada7224f1
5 changed files with 209 additions and 96 deletions
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143
src/libslic3r/MeshBoolean.cpp
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@ -1,11 +1,15 @@
#include "MeshBoolean.hpp"
#include "libslic3r/TriangleMesh.hpp"
#undef PI
// Include igl first. It defines "L" macro which then clashes with our localization
#include <igl/copyleft/cgal/mesh_boolean.h>
#undef L
#include "libslic3r/TriangleMesh.hpp"
// CGAL headers
#include <CGAL/Polygon_mesh_processing/corefinement.h>
#include <CGAL/Exact_integer.h>
#include <CGAL/Surface_mesh.h>
namespace Slic3r {
namespace MeshBoolean {
@ -13,27 +17,41 @@ namespace MeshBoolean {
typedef Eigen::Map<const Eigen::Matrix<float, Eigen::Dynamic, Eigen::Dynamic, Eigen::RowMajor | Eigen::DontAlign>> MapMatrixXfUnaligned;
typedef Eigen::Map<const Eigen::Matrix<int, Eigen::Dynamic, Eigen::Dynamic, Eigen::RowMajor | Eigen::DontAlign>> MapMatrixXiUnaligned;
typedef std::pair<Eigen::MatrixXd, Eigen::MatrixXi> EigenMesh;
static TriangleMesh eigen_to_triangle_mesh(const Eigen::MatrixXd& VC, const Eigen::MatrixXi& FC)
{
Pointf3s vertices;
for (size_t i=0; i<VC.rows(); ++i)
vertices.push_back(Vec3d(VC(i,0), VC(i,1), VC(i,2)));
std::vector<Vec3crd> facets;
for (size_t i=0; i<FC.rows(); ++i)
facets.push_back(Vec3crd(FC(i,0), FC(i,1), FC(i,2)));
TriangleMesh out(vertices, facets);
Pointf3s points(size_t(VC.rows()));
std::vector<Vec3crd> facets(size_t(FC.rows()));
for (Eigen::Index i = 0; i < VC.rows(); ++i)
points[size_t(i)] = VC.row(i);
for (Eigen::Index i = 0; i < FC.rows(); ++i)
facets[size_t(i)] = FC.row(i);
TriangleMesh out{points, facets};
out.require_shared_vertices();
return out;
}
static EigenMesh triangle_mesh_to_eigen_mesh(const TriangleMesh &mesh)
{
EigenMesh emesh;
emesh.first = MapMatrixXfUnaligned(mesh.its.vertices.front().data(),
Eigen::Index(mesh.its.vertices.size()),
3).cast<double>();
emesh.second = MapMatrixXiUnaligned(mesh.its.indices.front().data(),
Eigen::Index(mesh.its.indices.size()),
3);
return emesh;
}
void minus(TriangleMesh& A, const TriangleMesh& B)
{
Eigen::MatrixXd VA = MapMatrixXfUnaligned(A.its.vertices.front().data(), A.its.vertices.size(), 3).cast<double>();
Eigen::MatrixXi FA = MapMatrixXiUnaligned(A.its.indices.front().data(), A.its.indices.size(), 3);
Eigen::MatrixXd VB = MapMatrixXfUnaligned(B.its.vertices.front().data(), B.its.vertices.size(), 3).cast<double>();
Eigen::MatrixXi FB = MapMatrixXiUnaligned(B.its.indices.front().data(), B.its.indices.size(), 3);
auto [VA, FA] = triangle_mesh_to_eigen_mesh(A);
auto [VB, FB] = triangle_mesh_to_eigen_mesh(B);
Eigen::MatrixXd VC;
Eigen::MatrixXi FC;
@ -43,21 +61,110 @@ void minus(TriangleMesh& A, const TriangleMesh& B)
A = eigen_to_triangle_mesh(VC, FC);
}
void self_union(TriangleMesh& mesh)
{
Eigen::MatrixXd V = MapMatrixXfUnaligned(mesh.its.vertices.front().data(), mesh.its.vertices.size(), 3).cast<double>();
Eigen::MatrixXi F = MapMatrixXiUnaligned(mesh.its.indices.front().data(), mesh.its.indices.size(), 3);
auto [V, F] = triangle_mesh_to_eigen_mesh(mesh);
Eigen::MatrixXd VC;
Eigen::MatrixXi FC;
igl::MeshBooleanType boolean_type(igl::MESH_BOOLEAN_TYPE_UNION);
igl::copyleft::cgal::mesh_boolean(V, F, Eigen::MatrixXd(), Eigen::MatrixXi(), boolean_type, VC, FC);
mesh = eigen_to_triangle_mesh(VC, FC);
}
namespace cgal {
namespace CGALProc = CGAL::Polygon_mesh_processing;
namespace CGALParams = CGAL::Polygon_mesh_processing::parameters;
using Kernel = CGAL::Exact_predicates_inexact_constructions_kernel;
using _CGALMesh = CGAL::Surface_mesh<Kernel::Point_3>;
struct CGALMesh { _CGALMesh m; };
static void triangle_mesh_to_cgal(const TriangleMesh &M, _CGALMesh &out)
{
for (const Vec3f &v : M.its.vertices)
out.add_vertex(_CGALMesh::Point(v.x(), v.y(), v.z()));
for (const Vec3crd &face : M.its.indices) {
auto f = face.cast<CGAL::SM_Vertex_index>();
out.add_face(f(0), f(1), f(2));
}
}
static TriangleMesh cgal_to_triangle_mesh(const _CGALMesh &cgalmesh)
{
Pointf3s points;
std::vector<Vec3crd> facets;
points.reserve(cgalmesh.num_vertices());
facets.reserve(cgalmesh.num_faces());
for (auto &vi : cgalmesh.vertices()) {
auto &v = cgalmesh.point(vi); // Don't ask...
points.emplace_back(v.x(), v.y(), v.z());
}
for (auto &face : cgalmesh.faces()) {
auto vtc = cgalmesh.vertices_around_face(cgalmesh.halfedge(face));
int i = 0;
Vec3crd trface;
for (auto v : vtc) trface(i++) = int(v.idx());
facets.emplace_back(trface);
}
TriangleMesh out{points, facets};
out.require_shared_vertices();
return out;
}
std::unique_ptr<CGALMesh> triangle_mesh_to_cgal(const TriangleMesh &M)
{
auto out = std::make_unique<CGALMesh>();
triangle_mesh_to_cgal(M, out->m);
return out;
}
void cgal_to_triangle_mesh(const CGALMesh &cgalmesh, TriangleMesh &out)
{
out = cgal_to_triangle_mesh(cgalmesh.m);
}
void minus(CGALMesh &A, CGALMesh &B)
{
CGALProc::corefine_and_compute_difference(A.m, B.m, A.m);
}
void self_union(CGALMesh &A)
{
CGALProc::corefine(A.m, A.m);
}
void minus(TriangleMesh &A, const TriangleMesh &B)
{
CGALMesh meshA;
CGALMesh meshB;
triangle_mesh_to_cgal(A, meshA.m);
triangle_mesh_to_cgal(B, meshB.m);
CGALMesh meshResult;
CGALProc::corefine_and_compute_difference(meshA.m, meshB.m, meshResult.m);
A = cgal_to_triangle_mesh(meshResult.m);
}
void self_union(TriangleMesh &m)
{
_CGALMesh cgalmesh;
triangle_mesh_to_cgal(m, cgalmesh);
CGALProc::corefine(cgalmesh, cgalmesh);
m = cgal_to_triangle_mesh(cgalmesh);
}
} // namespace cgal
} // namespace MeshBoolean
} // namespace Slic3r