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Entities for basic CSG

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This commit is contained in:
Ken Arroyo Ohori
2017-03-02 15:09:05 -06:00
parent db85bebc1a
commit 2cb53a860d
2 changed files with 80 additions and 0 deletions
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src/ifcgeom/kernels/cgal/CgalEntityMapping.h
+2
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@@ -37,6 +37,8 @@ SHAPES(IfcManifoldSolidBrep);
SHAPE(IfcExtrudedAreaSolid);
SHAPE(IfcConnectedFaceSet);
SHAPE(IfcCsgSolid);
SHAPE(IfcBlock);
FACE(IfcFace);
FACE(IfcRectangleProfileDef);
src/ifcgeom/kernels/cgal/CgalIfcGeomShapes.cpp
+78
View File
@@ -138,3 +138,81 @@ bool IfcGeom::CgalKernel::convert(const IfcSchema::IfcConnectedFaceSet* l, cgal_
shape = polyhedron;
return true;
}
bool IfcGeom::CgalKernel::convert(const IfcSchema::IfcCsgSolid* l, cgal_shape_t& shape) {
return convert_shape(l->TreeRootExpression(), shape);
}
bool IfcGeom::CgalKernel::convert(const IfcSchema::IfcBlock* l, cgal_shape_t& shape) {
const double dx = l->XLength() * getValue(GV_LENGTH_UNIT);
const double dy = l->YLength() * getValue(GV_LENGTH_UNIT);
const double dz = l->ZLength() * getValue(GV_LENGTH_UNIT);
std::list<cgal_face_t> face_list;
// x = 0
face_list.push_back(cgal_face_t());
face_list.back().outer.push_back(Kernel::Point_3(0, 0, 0));
face_list.back().outer.push_back(Kernel::Point_3(0, dy, 0));
face_list.back().outer.push_back(Kernel::Point_3(0, dy, dz));
face_list.back().outer.push_back(Kernel::Point_3(0, 0, dz));
// x = dx
face_list.push_back(cgal_face_t());
face_list.back().outer.push_back(Kernel::Point_3(dx, 0, 0));
face_list.back().outer.push_back(Kernel::Point_3(dx, 0, dz));
face_list.back().outer.push_back(Kernel::Point_3(dx, dy, dz));
face_list.back().outer.push_back(Kernel::Point_3(dx, dy, 0));
// y = 0
face_list.push_back(cgal_face_t());
face_list.back().outer.push_back(Kernel::Point_3(0, 0, 0));
face_list.back().outer.push_back(Kernel::Point_3(0, 0, dz));
face_list.back().outer.push_back(Kernel::Point_3(dx, 0, dz));
face_list.back().outer.push_back(Kernel::Point_3(dx, 0, 0));
// y = dy
face_list.push_back(cgal_face_t());
face_list.back().outer.push_back(Kernel::Point_3(0, dy, 0));
face_list.back().outer.push_back(Kernel::Point_3(dx, dy, 0));
face_list.back().outer.push_back(Kernel::Point_3(dx, dy, dz));
face_list.back().outer.push_back(Kernel::Point_3(0, dy, dz));
// z = 0
face_list.push_back(cgal_face_t());
face_list.back().outer.push_back(Kernel::Point_3(0, 0, 0));
face_list.back().outer.push_back(Kernel::Point_3(dx, 0, 0));
face_list.back().outer.push_back(Kernel::Point_3(dx, dy, 0));
face_list.back().outer.push_back(Kernel::Point_3(0, dy, 0));
// z = dz
face_list.push_back(cgal_face_t());
face_list.back().outer.push_back(Kernel::Point_3(0, 0, dz));
face_list.back().outer.push_back(Kernel::Point_3(0, dy, dz));
face_list.back().outer.push_back(Kernel::Point_3(dx, dy, dz));
face_list.back().outer.push_back(Kernel::Point_3(dx, 0, dz));
// Naive creation
cgal_shape_t polyhedron = CGAL::Polyhedron_3<Kernel>();
PolyhedronBuilder builder(&face_list);
polyhedron.delegate(builder);
// Stitch edges
// std::cout << "Before: " << polyhedron.size_of_vertices() << " vertices and " << polyhedron.size_of_facets() << " facets" << std::endl;
CGAL::Polygon_mesh_processing::stitch_borders(polyhedron);
if (!CGAL::Polygon_mesh_processing::is_outward_oriented(polyhedron)) {
CGAL::Polygon_mesh_processing::reverse_face_orientations(polyhedron);
}
// std::cout << "After: " << polyhedron.size_of_vertices() << " vertices and " << polyhedron.size_of_facets() << " facets" << std::endl;
cgal_placement_t trsf;
IfcGeom::CgalKernel::convert(l->Position(),trsf);
// IfcCsgPrimitive3D.Position has unit scale factor
for (auto &vertex: vertices(polyhedron)) {
vertex->point() = vertex->point().transform(trsf);
}
shape = polyhedron;
return true;
}