libsurf
Programmer's Documentation
libsurf
Programmer's Documentation
Topological face.
TopoFace represents a single surface which is bounded and constrained by a number of TopoEdges.
Mesh generation concept: As a precondition, each face must be bounded by one or more edges which define the outer boundary of the domain to discretize. Mesh generation starts with tesselating all edges (from Topology) in a manner which conforms to the mesh quality criteria defined on all faces which share the edge. Then, the segments which represent the edges are inserted into the face meshes which are, at first, initialized trivially. The next phase is the generation of a first mesh on each face, followed by the computation and processing of intersection lines in TopoSegmChain. The result of the face intersection process is a set of new edges which represent the intersection lines, which may be remeshed for a better local parameterization.
Starting anew, each face mesh is cleared and the new set of edges, including intersection lines, are enforced to be present in each face mesh.
Faces which are meshed by an external procedure can import a predefined mesh and set the keepExplicitMesh flag to avoid running the internal mesh generation and injection of edges. With this flag set, intersections hitting such surfaces can naturally not be handled.
#include <topoface.h>
Public Types | |
| enum | MgBackend { DcMeshGen, JrsTriangle } |
Public Member Functions | |
| TopoFace () | |
| create undefined face | |
| TopoFace (SurfacePtr psf, uint id) | |
| initialize face with surface | |
| SurfacePtr | surface () const |
| access surface | |
| void | criterion (DcMeshCritBasePtr pmc) |
| copy (!) discretization criterion, will be modified locally | |
| Real | sqMergeTolerance () const |
| access point merge tolerance | |
| void | iid (uint id) |
| change id | |
| DcMeshCritBasePtr | criterion () const |
| access discretization criterion | |
| const Indices & | edges () const |
| edges connected to this | |
| Vct3 | eval (Real u, Real v) const |
| evaluate surface | |
| void | plane (Real u, Real v, Vct3 &S, Vct3 &Su, Vct3 &Sv) const |
| evaluate point and derivatives on surface | |
| uint | appendEdge (uint e, bool isHole=false) |
| connect to edge e | |
| bool | replaceEdge (uint a, uint b) |
| replace edge a with b, return true if successful | |
| uint | findEdge (uint e) const |
| find local index of edge e | |
| uint | detachEdge (uint e) |
| eliminate edge with global index e from connectivity | |
| uint | findConnection (const Topology &topo, const Vct2 &q1, const Vct2 &q2, Real tol=gmepsilon) const |
| identify the edge (global index) of this face which connects q1 and q2 | |
| void | clearMesh () |
| clear stored mesh, initialize (u,v) mapping if necessary | |
| uint | insertEdges (const Topology &topo, bool allowSplit=true) |
| insert edge constraints into (u,v) mesh | |
| void | pushSplitsToEdges (Topology &topo) const |
| propagate constraint splitting to topological edges | |
| bool | keepExplicitMesh () const |
| indicates whether face wants to retain an externally generated mesh | |
| uint | generateMesh (const Topology &topo) |
| create mesh on face, accounting for discretized edges | |
| uint | generateMesh (const Topology &topo, const PointList< 2 > &pini) |
| create mesh on face, starting with prescribed initial vertices | |
| void | importMesh (const PointList< 2 > &uvp, const Indices &tri, bool keepExplicit=true) |
| alternatively, import a mesh generated explicitly (call replaceEdgeNodes!) | |
| void | replaceEdgeNodes (const Topology &topo, bool isecOnly=true) |
| replace edge vertices in order to make edge nodes match exactly | |
| const TriMesh & | mesh () const |
| access mesh (once it has been generated) | |
| TriMesh & | mesh () |
| access mesh (once it has been generated) | |
| const PointList< 2 > & | uvVertices () const |
| access mesh coordinates in (u,v) space | |
| void | splitBoundaries (Topology &topo) |
| split edges which are intersected by newly introduced intersections | |
| void | uvDump (const Topology &topo, const std::string &fname) const |
| debugging : write mesh and boundaries in (u,v) space | |
| void | print (uint k, std::ostream &os) const |
| plain-text debugging output | |
Static Public Member Functions | |
| static void | backend (int b) |
| change backend to use for mesh generation | |
Private Member Functions | |
| void | constructMeshGen () |
| create internal mesh generator instance | |
| bool | carveHole (const TopoEdge &e) |
| remove triangles within internal hole edge k | |
Private Attributes | |
| SurfacePtr | m_psf |
| each face is backed by exactly one surface | |
| Indices | m_edges |
| edges on this face | |
| std::vector< bool > | m_edgeIsHole |
| indicates whether an edge is an internal boundary (a hole) | |
| DcMeshCritBasePtr | m_pmc |
| criterion used for meshing | |
| MeshGeneratorPtr | m_mg |
| dispatches to DC or JRS mesh generation | |
| uint | m_iid |
| integer id (index in Topology) | |
| bool | m_keepExplicitMesh |
| if true, keep externally/explicitely generated mesh | |
Static Private Attributes | |
| static int | s_backend = TopoFace::DcMeshGen |
| mesh generator backend to use | |
1.8.5