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https://github.com/IfcOpenShell/IfcOpenShell.git
synced 2026-08-10 17:58:20 +00:00
Boolean ops using Nef polyhedra (untested)
This commit is contained in:
Ken Arroyo Ohori
@@ -25,14 +25,17 @@ bool IfcGeom::CgalKernel::convert(const IfcSchema::IfcRepresentation* l, Convers
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bool IfcGeom::CgalKernel::convert(const IfcSchema::IfcCartesianPoint* l, cgal_point_t& point) {
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std::vector<double> xyz = l->Coordinates();
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if (xyz.size() == 3) {
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if (xyz.size() < 4) {
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point = Kernel::Point_3(xyz.size() ? (xyz[0]*getValue(GV_LENGTH_UNIT)) : 0.0f,
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xyz.size() > 1 ? (xyz[1]*getValue(GV_LENGTH_UNIT)) : 0.0f,
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xyz.size() > 2 ? (xyz[2]*getValue(GV_LENGTH_UNIT)) : 0.0f);
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// std::cout << "Converted Point(" << point << ")" << std::endl;
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return true;
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} else {
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throw std::runtime_error("Point without 3 coordinates");
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std::cout << "Point(";
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for (auto &coordinate: xyz) std::cout << coordinate << " ";
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std::cout << ")";
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throw std::runtime_error("Could not parse point");
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}
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}
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@@ -40,6 +40,8 @@ SHAPE(IfcExtrudedAreaSolid);
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SHAPE(IfcConnectedFaceSet);
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SHAPE(IfcCsgSolid);
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SHAPE(IfcBlock);
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SHAPE(IfcBooleanResult);
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SHAPE(IfcSphere);
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FACE(IfcArbitraryClosedProfileDef);
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FACE(IfcFace);
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@@ -268,3 +268,241 @@ bool IfcGeom::CgalKernel::convert(const IfcSchema::IfcBlock* l, cgal_shape_t& sh
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shape = polyhedron;
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return true;
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}
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bool IfcGeom::CgalKernel::convert(const IfcSchema::IfcBooleanResult* l, cgal_shape_t& shape) {
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cgal_shape_t s1, s2;
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ConversionResults items1, items2;
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cgal_wire_t boundary_wire;
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IfcSchema::IfcBooleanOperand* operand1 = l->FirstOperand();
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IfcSchema::IfcBooleanOperand* operand2 = l->SecondOperand();
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bool is_halfspace = operand2->is(IfcSchema::Type::IfcHalfSpaceSolid);
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if ( shape_type(operand1) == ST_SHAPELIST ) {
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std::cout << "ST_SHAPELIST" << std::endl;
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// if (!(convert_shapes(operand1, items1) && flatten_shape_list(items1, s1, true))) {
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return false;
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// }
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} else if ( shape_type(operand1) == ST_SHAPE ) {
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if ( ! convert_shape(operand1, s1) ) {
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return false;
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}
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// TopoDS_Solid temp_solid;
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// s1 = ensure_fit_for_subtraction(s1, temp_solid);
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} else {
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Logger::Message(Logger::LOG_ERROR, "s1: Invalid representation item for boolean operation", operand1->entity);
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return false;
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}
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// const double first_operand_volume = shape_volume(s1);
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// if ( first_operand_volume <= ALMOST_ZERO )
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// Logger::Message(Logger::LOG_WARNING,"Empty solid for:",l->FirstOperand()->entity);
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bool shape2_processed = false;
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if ( shape_type(operand2) == ST_SHAPELIST ) {
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std::cout << "ST_SHAPELIST" << std::endl;
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// shape2_processed = convert_shapes(operand2, items2) && flatten_shape_list(items2, s2, true);
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} else if ( shape_type(operand2) == ST_SHAPE ) {
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shape2_processed = convert_shape(operand2,s2);
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if (shape2_processed && !is_halfspace) {
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// TopoDS_Solid temp_solid;
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// s2 = ensure_fit_for_subtraction(s2, temp_solid);
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}
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} else {
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Logger::Message(Logger::LOG_ERROR, "s2: Invalid representation item for boolean operation", operand2->entity);
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}
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if (!shape2_processed) {
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// shape = s1;
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Logger::Message(Logger::LOG_ERROR,"Failed to convert SecondOperand of:",l->entity);
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// return true;
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}
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// if (!is_halfspace) {
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// const double second_operand_volume = shape_volume(s2);
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// if ( second_operand_volume <= ALMOST_ZERO )
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// Logger::Message(Logger::LOG_WARNING,"Empty solid for:",operand2->entity);
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// }
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const IfcSchema::IfcBooleanOperator::IfcBooleanOperator op = l->Operator();
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CGAL::Nef_polyhedron_3<Kernel> nef1(s1);
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CGAL::Nef_polyhedron_3<Kernel> nef2(s2);
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if (op == IfcSchema::IfcBooleanOperator::IfcBooleanOperator_DIFFERENCE) {
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CGAL::Nef_polyhedron_3<Kernel> nef_result = nef1-nef2;
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cgal_shape_t result;
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nef_result.convert_to_polyhedron(result);
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shape = result;
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return true;
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} else if (op == IfcSchema::IfcBooleanOperator::IfcBooleanOperator_UNION) {
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CGAL::Nef_polyhedron_3<Kernel> nef_result = nef1+nef2;
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cgal_shape_t result;
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nef_result.convert_to_polyhedron(result);
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shape = result;
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return true;
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} else if (op == IfcSchema::IfcBooleanOperator::IfcBooleanOperator_INTERSECTION) {
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CGAL::Nef_polyhedron_3<Kernel> nef_result = nef1*nef2;
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cgal_shape_t result;
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nef_result.convert_to_polyhedron(result);
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shape = result;
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return true;
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}
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return false;
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}
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bool IfcGeom::CgalKernel::convert(const IfcSchema::IfcSphere* l, cgal_shape_t& shape) {
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const double r = l->Radius() * getValue(GV_LENGTH_UNIT);
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// Make icosahedron
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float golden_ratio = (1.0+sqrtf(5.0))/2.0;
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float normalising_factor = sqrtf(golden_ratio*golden_ratio+1.0);
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std::vector<Kernel::Point_3> icosahedron_vertices;
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icosahedron_vertices.push_back(Kernel::Point_3(-1.0/normalising_factor, golden_ratio/normalising_factor, 0.0));
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icosahedron_vertices.push_back(Kernel::Point_3( 1.0/normalising_factor, golden_ratio/normalising_factor, 0.0));
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icosahedron_vertices.push_back(Kernel::Point_3(-1.0/normalising_factor, -golden_ratio/normalising_factor, 0.0));
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icosahedron_vertices.push_back(Kernel::Point_3( 1.0/normalising_factor, -golden_ratio/normalising_factor, 0.0));
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icosahedron_vertices.push_back(Kernel::Point_3(0.0, -1.0/normalising_factor, golden_ratio/normalising_factor));
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icosahedron_vertices.push_back(Kernel::Point_3(0.0, 1.0/normalising_factor, golden_ratio/normalising_factor));
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icosahedron_vertices.push_back(Kernel::Point_3(0.0, -1.0/normalising_factor, -golden_ratio/normalising_factor));
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icosahedron_vertices.push_back(Kernel::Point_3(0.0, 1.0/normalising_factor, -golden_ratio/normalising_factor));
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icosahedron_vertices.push_back(Kernel::Point_3( golden_ratio/normalising_factor, 0.0, -1.0/normalising_factor));
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icosahedron_vertices.push_back(Kernel::Point_3( golden_ratio/normalising_factor, 0.0, 1.0/normalising_factor));
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icosahedron_vertices.push_back(Kernel::Point_3(-golden_ratio/normalising_factor, 0.0, -1.0/normalising_factor));
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icosahedron_vertices.push_back(Kernel::Point_3(-golden_ratio/normalising_factor, 0.0, 1.0/normalising_factor));
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std::list<cgal_face_t> face_list;
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[0]);
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face_list.back().outer.push_back(icosahedron_vertices[11]);
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face_list.back().outer.push_back(icosahedron_vertices[5]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[0]);
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face_list.back().outer.push_back(icosahedron_vertices[5]);
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face_list.back().outer.push_back(icosahedron_vertices[1]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[0]);
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face_list.back().outer.push_back(icosahedron_vertices[1]);
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face_list.back().outer.push_back(icosahedron_vertices[7]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[0]);
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face_list.back().outer.push_back(icosahedron_vertices[7]);
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face_list.back().outer.push_back(icosahedron_vertices[10]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[0]);
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face_list.back().outer.push_back(icosahedron_vertices[10]);
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face_list.back().outer.push_back(icosahedron_vertices[11]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[1]);
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face_list.back().outer.push_back(icosahedron_vertices[5]);
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face_list.back().outer.push_back(icosahedron_vertices[9]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[5]);
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face_list.back().outer.push_back(icosahedron_vertices[11]);
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face_list.back().outer.push_back(icosahedron_vertices[4]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[11]);
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face_list.back().outer.push_back(icosahedron_vertices[10]);
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face_list.back().outer.push_back(icosahedron_vertices[2]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[10]);
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face_list.back().outer.push_back(icosahedron_vertices[7]);
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face_list.back().outer.push_back(icosahedron_vertices[6]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[7]);
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face_list.back().outer.push_back(icosahedron_vertices[1]);
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face_list.back().outer.push_back(icosahedron_vertices[8]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[3]);
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face_list.back().outer.push_back(icosahedron_vertices[9]);
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face_list.back().outer.push_back(icosahedron_vertices[4]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[3]);
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face_list.back().outer.push_back(icosahedron_vertices[4]);
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face_list.back().outer.push_back(icosahedron_vertices[2]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[3]);
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face_list.back().outer.push_back(icosahedron_vertices[2]);
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face_list.back().outer.push_back(icosahedron_vertices[6]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[3]);
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face_list.back().outer.push_back(icosahedron_vertices[6]);
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face_list.back().outer.push_back(icosahedron_vertices[8]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[3]);
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face_list.back().outer.push_back(icosahedron_vertices[8]);
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face_list.back().outer.push_back(icosahedron_vertices[9]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[4]);
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face_list.back().outer.push_back(icosahedron_vertices[9]);
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face_list.back().outer.push_back(icosahedron_vertices[5]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[2]);
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face_list.back().outer.push_back(icosahedron_vertices[4]);
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face_list.back().outer.push_back(icosahedron_vertices[11]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[6]);
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face_list.back().outer.push_back(icosahedron_vertices[2]);
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face_list.back().outer.push_back(icosahedron_vertices[10]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[8]);
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face_list.back().outer.push_back(icosahedron_vertices[6]);
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face_list.back().outer.push_back(icosahedron_vertices[7]);
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face_list.push_back(cgal_face_t());
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face_list.back().outer.push_back(icosahedron_vertices[9]);
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face_list.back().outer.push_back(icosahedron_vertices[8]);
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face_list.back().outer.push_back(icosahedron_vertices[1]);
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// TODO: Refine icosahedron to create icosphere
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// Naive creation
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cgal_shape_t polyhedron = CGAL::Polyhedron_3<Kernel>();
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PolyhedronBuilder builder(&face_list);
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polyhedron.delegate(builder);
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// Stitch edges
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// std::cout << "Before: " << polyhedron.size_of_vertices() << " vertices and " << polyhedron.size_of_facets() << " facets" << std::endl;
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CGAL::Polygon_mesh_processing::stitch_borders(polyhedron);
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if (!CGAL::Polygon_mesh_processing::is_outward_oriented(polyhedron)) {
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CGAL::Polygon_mesh_processing::reverse_face_orientations(polyhedron);
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}
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// std::cout << "After: " << polyhedron.size_of_vertices() << " vertices and " << polyhedron.size_of_facets() << " facets" << std::endl;
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cgal_placement_t trsf;
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IfcGeom::CgalKernel::convert(l->Position(),trsf);
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for (auto &vertex: vertices(polyhedron)) {
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vertex->point() = Kernel::Point_3(vertex->point().x()*r,
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vertex->point().y()*r,
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vertex->point().z()*r).transform(trsf);
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}
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return true;
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}
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@@ -47,6 +47,7 @@ if ( it != cache.T.end() ) { e = it->second; return true; }
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#include <CGAL/Polygon_mesh_processing/orientation.h>
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#include <CGAL/Polygon_mesh_processing/triangulate_faces.h>
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#include <CGAL/Polygon_mesh_processing/compute_normal.h>
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#include <CGAL/Nef_polyhedron_3.h>
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typedef CGAL::Exact_predicates_exact_constructions_kernel Kernel;
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