444 lines
20 KiB
C++
444 lines
20 KiB
C++
// Copyright (c) 2015 GeometryFactory (France).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org).
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/remesh.h $
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// $Id: remesh.h c253679 2020-04-18T16:27:58+02:00 Sébastien Loriot
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// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Jane Tournois
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#ifndef CGAL_POLYGON_MESH_PROCESSING_REMESH_H
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#define CGAL_POLYGON_MESH_PROCESSING_REMESH_H
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#include <CGAL/license/Polygon_mesh_processing/meshing_hole_filling.h>
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#include <CGAL/disable_warnings.h>
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#include <CGAL/Polygon_mesh_processing/internal/Isotropic_remeshing/remesh_impl.h>
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#include <CGAL/Polygon_mesh_processing/internal/named_function_params.h>
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#include <CGAL/Polygon_mesh_processing/internal/named_params_helper.h>
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#ifdef CGAL_PMP_REMESHING_VERBOSE
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#include <CGAL/Timer.h>
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#endif
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namespace CGAL {
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namespace Polygon_mesh_processing {
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/*!
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* \ingroup PMP_meshing_grp
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* @brief remeshes a triangulated region of a polygon mesh.
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* This operation sequentially performs edge splits, edge collapses,
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* edge flips, tangential relaxation and projection to the initial surface
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* to generate a smooth mesh with a prescribed edge length.
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*
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* @tparam PolygonMesh model of `MutableFaceGraph`.
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* The descriptor types `boost::graph_traits<PolygonMesh>::%face_descriptor`
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* and `boost::graph_traits<PolygonMesh>::%halfedge_descriptor` must be
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* models of `Hashable`.
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* @tparam FaceRange range of `boost::graph_traits<PolygonMesh>::%face_descriptor`,
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model of `Range`. Its iterator type is `ForwardIterator`.
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* @tparam NamedParameters a sequence of \ref bgl_namedparameters "Named Parameters"
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*
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* @param pmesh a polygon mesh with triangulated surface patches to be remeshed
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* @param faces the range of triangular faces defining one or several surface patches to be remeshed
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* @param target_edge_length the edge length that is targeted in the remeshed patch.
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* If `0` is passed then only the edge-flip, tangential relaxation, and projection steps will be done.
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* @param np an optional sequence of \ref bgl_namedparameters "Named Parameters" among the ones listed below
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*
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* @pre if constraints protection is activated, the constrained edges must
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* not be longer than 4/3*`target_edge_length`
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*
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* \cgalNamedParamsBegin
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* \cgalParamNBegin{vertex_point_map}
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* \cgalParamDescription{a property map associating points to the vertices of `pmesh`}
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* \cgalParamType{a class model of `ReadWritePropertyMap` with `boost::graph_traits<PolygonMesh>::%vertex_descriptor`
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* as key type and `%Point_3` as value type}
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* \cgalParamDefault{`boost::get(CGAL::vertex_point, pmesh)`}
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* \cgalParamExtra{If this parameter is omitted, an internal property map for `CGAL::vertex_point_t`
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* must be available in `PolygonMesh`.}
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* \cgalParamNEnd
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*
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* \cgalParamNBegin{geom_traits}
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* \cgalParamDescription{an instance of a geometric traits class}
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* \cgalParamType{a class model of `Kernel`}
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* \cgalParamDefault{a \cgal Kernel deduced from the point type, using `CGAL::Kernel_traits`}
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* \cgalParamExtra{The geometric traits class must be compatible with the vertex point type.}
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* \cgalParamExtra{Exact constructions kernels are not supported by this function.}
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* \cgalParamNEnd
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*
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* \cgalParamNBegin{face_index_map}
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* \cgalParamDescription{a property map associating to each face of `pmesh` a unique index between `0` and `num_faces(pmesh) - 1`}
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* \cgalParamType{a class model of `ReadablePropertyMap` with `boost::graph_traits<PolygonMesh>::%face_descriptor`
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* as key type and `std::size_t` as value type}
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* \cgalParamDefault{an automatically indexed internal map}
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* \cgalParamNEnd
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*
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* \cgalParamNBegin{number_of_iterations}
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* \cgalParamDescription{the number of iterations for the sequence of atomic operations performed (listed in the above description)}
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* \cgalParamType{unsigned int}
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* \cgalParamDefault{`1`}
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* \cgalParamNEnd
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*
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* \cgalParamNBegin{edge_is_constrained_map}
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* \cgalParamDescription{a property map containing the constrained-or-not status of each edge of `pmesh`}
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* \cgalParamType{a class model of `ReadWritePropertyMap` with `boost::graph_traits<PolygonMesh>::%edge_descriptor`
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* as key type and `bool` as value type. It must be default constructible.}
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* \cgalParamDefault{a default property map where no edge is constrained}
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* \cgalParamExtra{A constrained edge can be split or collapsed, but not flipped, nor its endpoints moved by smoothing.}
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* \cgalParamExtra{Sub-edges generated by splitting are set to be constrained.}
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* \cgalParamExtra{Patch boundary edges (i.e. incident to only one face in the range) are always considered as constrained edges.}
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* \cgalParamNEnd
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*
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* \cgalParamNBegin{vertex_is_constrained_map}
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* \cgalParamDescription{a property map containing the constrained-or-not status of each vertex of `pmesh`.}
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* \cgalParamType{a class model of `ReadWritePropertyMap` with `boost::graph_traits<PolygonMesh>::%vertex_descriptor`
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* as key type and `bool` as value type. It must be default constructible.}
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* \cgalParamDefault{a default property map where no vertex is constrained}
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* \cgalParamExtra{A constrained vertex cannot be modified during remeshing.}
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* \cgalParamNEnd
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*
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* \cgalParamNBegin{protect_constraints}
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* \cgalParamDescription{If `true`, the edges set as constrained in `edge_is_constrained_map`
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* (or by default the boundary edges) are not split nor collapsed during remeshing.}
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* \cgalParamType{Boolean}
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* \cgalParamDefault{`false`}
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* \cgalParamExtra{Note that around constrained edges that have their length higher than
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* twice `target_edge_length`, remeshing will fail to provide good quality results.
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* It can even fail to terminate because of cascading vertex insertions.}
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* \cgalParamNEnd
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*
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* \cgalParamNBegin{collapse_constraints}
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* \cgalParamDescription{If `true`, the edges set as constrained in `edge_is_constrained_map`
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* (or by default the boundary edges) are collapsed during remeshing.}
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* \cgalParamType{Boolean}
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* \cgalParamDefault{`true`}
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* \cgalParamExtra{This value is ignored if `protect_constraints` is `true`.}
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* \cgalParamNEnd
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*
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* \cgalParamNBegin{face_patch_map}
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* \cgalParamDescription{a property map with the patch id's associated to the faces of `faces`}
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* \cgalParamType{a class model of `ReadWritePropertyMap` with `boost::graph_traits<PolygonMesh>::%face_descriptor`
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* as key type and the desired property, model of `CopyConstructible` as value type.}
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* \cgalParamDefault{a default property map where each face is associated with the ID of
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* the connected component it belongs to. Connected components are
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* computed with respect to the constrained edges listed in the property map
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* `edge_is_constrained_map`}
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* \cgalParamExtra{The map is updated during the remeshing process while new faces are created.}
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* \cgalParamNEnd
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*
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* \cgalParamNBegin{number_of_relaxation_steps}
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* \cgalParamDescription{the number of iterations of tangential relaxation that are performed
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* at each iteration of the remeshing process}
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* \cgalParamType{unsigned int}
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* \cgalParamDefault{`1`}
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* \cgalParamNEnd
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*
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* \cgalParamNBegin{relax_constraints}
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* \cgalParamDescription{If `true`, the end vertices of the edges set as constrained
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* in `edge_is_constrained_map` and boundary edges move along the}
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* constrained polylines they belong to.}
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* \cgalParamType{Boolean}
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* \cgalParamDefault{`false`}
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* \cgalParamNEnd
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*
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* \cgalParamNBegin{do_project}
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* \cgalParamDescription{whether vertices should be reprojected on the input surface after creation or displacement}
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* \cgalParamType{Boolean}
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* \cgalParamDefault{`true`}
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* \cgalParamNEnd
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*
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* \cgalParamNBegin{projection_functor}
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* \cgalParamDescription{A function object used to project input vertices (moved by the smoothing) and created vertices}
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* \cgalParamType{Unary functor that provides `%Point_3 operator()(vertex_descriptor)`, `%Point_3` being the value type
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* of the vertex point map.}
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* \cgalParamDefault{If not provided, vertices are projected on the input surface mesh.}
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* \cgalParamNEnd
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* \cgalNamedParamsEnd
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*
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* @sa `split_long_edges()`
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*
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*@todo Deal with exact constructions Kernel. The only thing that makes sense is to
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* guarantee that the output vertices are exactly on the input surface.
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* To do so, we can do every construction in `double`, and use an exact process for
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* projection. For each vertex, the `AABB_tree` would be used in an inexact manner
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* to find the triangle on which projection has to be done. Then, use
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* `CGAL::intersection(triangle, line)` in the exact constructions kernel to
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* get a point which is exactly on the surface.
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*
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*/
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template<typename PolygonMesh
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, typename FaceRange
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, typename NamedParameters>
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void isotropic_remeshing(const FaceRange& faces
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, const double& target_edge_length
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, PolygonMesh& pmesh
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, const NamedParameters& np)
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{
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if (boost::begin(faces)==boost::end(faces))
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return;
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typedef PolygonMesh PM;
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typedef typename boost::graph_traits<PM>::vertex_descriptor vertex_descriptor;
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typedef typename boost::graph_traits<PM>::edge_descriptor edge_descriptor;
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using parameters::get_parameter;
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using parameters::choose_parameter;
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#ifdef CGAL_PMP_REMESHING_VERBOSE
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std::cout << std::endl;
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CGAL::Timer t;
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std::cout << "Remeshing parameters...";
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std::cout.flush();
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t.start();
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#endif
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static const bool need_aabb_tree =
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parameters::is_default_parameter(get_parameter(np, internal_np::projection_functor));
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typedef typename GetGeomTraits<PM, NamedParameters>::type GT;
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GT gt = choose_parameter<GT>(get_parameter(np, internal_np::geom_traits));
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typedef typename GetVertexPointMap<PM, NamedParameters>::type VPMap;
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VPMap vpmap = choose_parameter(get_parameter(np, internal_np::vertex_point),
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get_property_map(vertex_point, pmesh));
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typedef typename GetInitializedFaceIndexMap<PolygonMesh, NamedParameters>::type FIMap;
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FIMap fimap = CGAL::get_initialized_face_index_map(pmesh, np);
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typedef typename internal_np::Lookup_named_param_def <
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internal_np::edge_is_constrained_t,
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NamedParameters,
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Constant_property_map<edge_descriptor, bool> // default (no constraint pmap)
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> ::type ECMap;
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ECMap ecmap = choose_parameter(get_parameter(np, internal_np::edge_is_constrained),
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Constant_property_map<edge_descriptor, bool>(false));
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typedef typename internal_np::Lookup_named_param_def <
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internal_np::vertex_is_constrained_t,
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NamedParameters,
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Constant_property_map<vertex_descriptor, bool> // default (no constraint pmap)
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> ::type VCMap;
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VCMap vcmap = choose_parameter(get_parameter(np, internal_np::vertex_is_constrained),
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Constant_property_map<vertex_descriptor, bool>(false));
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bool protect = choose_parameter(get_parameter(np, internal_np::protect_constraints), false);
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typedef typename internal_np::Lookup_named_param_def <
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internal_np::face_patch_t,
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NamedParameters,
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internal::Connected_components_pmap<PM, FIMap>//default
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> ::type FPMap;
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FPMap fpmap = choose_parameter(
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get_parameter(np, internal_np::face_patch),
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internal::Connected_components_pmap<PM, FIMap>(faces, pmesh, ecmap, fimap,
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parameters::is_default_parameter(get_parameter(np, internal_np::face_patch)) && (need_aabb_tree
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#if !defined(CGAL_NO_PRECONDITIONS)
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|| protect // face patch map is used to identify patch border edges to check protected edges are short enough
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#endif
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) ) );
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double low = 4. / 5. * target_edge_length;
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double high = 4. / 3. * target_edge_length;
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#if !defined(CGAL_NO_PRECONDITIONS)
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if(protect)
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{
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std::string msg("Isotropic remeshing : protect_constraints cannot be set to");
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msg.append(" true with constraints larger than 4/3 * target_edge_length.");
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msg.append(" Remeshing aborted.");
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CGAL_precondition_msg(
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internal::constraints_are_short_enough(pmesh, ecmap, vpmap, fpmap, high),
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msg.c_str());
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}
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#endif
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#ifdef CGAL_PMP_REMESHING_VERBOSE
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t.stop();
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std::cout << "\rRemeshing parameters done ("<< t.time() <<" sec)" << std::endl;
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std::cout << "Remesher construction...";
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std::cout.flush();
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t.reset(); t.start();
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#endif
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typename internal::Incremental_remesher<PM, VPMap, GT, ECMap, VCMap, FPMap, FIMap>
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remesher(pmesh, vpmap, gt, protect, ecmap, vcmap, fpmap, fimap, need_aabb_tree);
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remesher.init_remeshing(faces);
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#ifdef CGAL_PMP_REMESHING_VERBOSE
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t.stop();
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std::cout << " done ("<< t.time() <<" sec)." << std::endl;
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#endif
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bool collapse_constraints = choose_parameter(get_parameter(np, internal_np::collapse_constraints), true);
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unsigned int nb_iterations = choose_parameter(get_parameter(np, internal_np::number_of_iterations), 1);
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bool smoothing_1d = choose_parameter(get_parameter(np, internal_np::relax_constraints), false);
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unsigned int nb_laplacian = choose_parameter(get_parameter(np, internal_np::number_of_relaxation_steps), 1);
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#ifdef CGAL_PMP_REMESHING_VERBOSE
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std::cout << std::endl;
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std::cout << "Remeshing (size = " << target_edge_length;
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std::cout << ", #iter = " << nb_iterations << ")..." << std::endl;
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t.reset(); t.start();
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#endif
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for (unsigned int i = 0; i < nb_iterations; ++i)
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{
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#ifdef CGAL_PMP_REMESHING_VERBOSE
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std::cout << " * Iteration " << (i + 1) << " *" << std::endl;
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#endif
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if (target_edge_length>0)
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{
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remesher.split_long_edges(high);
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remesher.collapse_short_edges(low, high, collapse_constraints);
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}
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remesher.equalize_valences();
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remesher.tangential_relaxation(smoothing_1d, nb_laplacian);
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if ( choose_parameter(get_parameter(np, internal_np::do_project), true) )
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remesher.project_to_surface(get_parameter(np, internal_np::projection_functor));
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#ifdef CGAL_PMP_REMESHING_VERBOSE
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std::cout << std::endl;
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#endif
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}
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#ifdef CGAL_PMP_REMESHING_VERBOSE
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t.stop();
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std::cout << "Remeshing done (size = " << target_edge_length;
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std::cout << ", #iter = " << nb_iterations;
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std::cout << ", " << t.time() << " sec )." << std::endl;
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#endif
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}
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template<typename PolygonMesh
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, typename FaceRange>
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void isotropic_remeshing(
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const FaceRange& faces
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, const double& target_edge_length
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, PolygonMesh& pmesh)
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{
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isotropic_remeshing(
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faces,
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target_edge_length,
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pmesh,
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parameters::all_default());
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}
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/*!
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* \ingroup PMP_meshing_grp
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* @brief splits the edges listed in `edges` into sub-edges
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* that are not longer than the given threshold `max_length`.
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*
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* Note this function is useful to split constrained edges before
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* calling `isotropic_remeshing()` with protection of constraints
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* activated (to match the constrained edge length required by the
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* remeshing algorithm to be guaranteed to terminate)
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*
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* @tparam PolygonMesh model of `MutableFaceGraph` that
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* has an internal property map for `CGAL::vertex_point_t`.
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* @tparam EdgeRange range of `boost::graph_traits<PolygonMesh>::%edge_descriptor`,
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* model of `Range`. Its iterator type is `InputIterator`.
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* @tparam NamedParameters a sequence of \ref bgl_namedparameters "Named Parameters"
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*
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* @param pmesh a polygon mesh
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* @param edges the range of edges to be split if they are longer than given threshold
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* @param max_length the edge length above which an edge from `edges` is split
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* into to sub-edges
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* @param np an optional sequence of \ref bgl_namedparameters "Named Parameters" among the ones listed below
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* \cgalNamedParamsBegin
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* \cgalParamNBegin{vertex_point_map}
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* \cgalParamDescription{a property map associating points to the vertices of `pmesh`}
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* \cgalParamType{a class model of `ReadWritePropertyMap` with `boost::graph_traits<PolygonMesh>::%vertex_descriptor`
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* as key type and `%Point_3` as value type}
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* \cgalParamDefault{`boost::get(CGAL::vertex_point, pmesh)`}
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* \cgalParamExtra{If this parameter is omitted, an internal property map for `CGAL::vertex_point_t`
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* must be available in `PolygonMesh`.}
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* \cgalParamNEnd
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*
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* \cgalParamNBegin{face_index_map}
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* \cgalParamDescription{a property map associating to each face of `pmesh` a unique index between `0` and `num_faces(pmesh) - 1`}
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* \cgalParamType{a class model of `ReadablePropertyMap` with `boost::graph_traits<PolygonMesh>::%face_descriptor`
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* as key type and `std::size_t` as value type}
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* \cgalParamDefault{an automatically indexed internal map}
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* \cgalParamNEnd
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*
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* \cgalParamNBegin{edge_is_constrained_map}
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* \cgalParamDescription{a property map containing the constrained-or-not status of each edge of `pmesh`}
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* \cgalParamType{a class model of `ReadWritePropertyMap` with `boost::graph_traits<PolygonMesh>::%edge_descriptor`
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* as key type and `bool` as value type. It must be default constructible.}
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* \cgalParamDefault{a default property map where no edge is constrained}
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* \cgalParamExtra{A constrained edge can be split or collapsed, but not flipped, nor its endpoints moved by smoothing.}
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* \cgalParamNEnd
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* \cgalNamedParamsEnd
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*
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* @sa `isotropic_remeshing()`
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*
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*/
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template<typename PolygonMesh
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, typename EdgeRange
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, typename NamedParameters>
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void split_long_edges(const EdgeRange& edges
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, const double& max_length
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, PolygonMesh& pmesh
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, const NamedParameters& np)
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{
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typedef PolygonMesh PM;
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typedef typename boost::graph_traits<PM>::edge_descriptor edge_descriptor;
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typedef typename boost::graph_traits<PM>::vertex_descriptor vertex_descriptor;
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using parameters::choose_parameter;
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using parameters::get_parameter;
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typedef typename GetGeomTraits<PM, NamedParameters>::type GT;
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GT gt = choose_parameter<GT>(get_parameter(np, internal_np::geom_traits));
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typedef typename GetVertexPointMap<PM, NamedParameters>::type VPMap;
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VPMap vpmap = choose_parameter(get_parameter(np, internal_np::vertex_point),
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get_property_map(vertex_point, pmesh));
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typedef typename GetInitializedFaceIndexMap<PolygonMesh, NamedParameters>::type FIMap;
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FIMap fimap = CGAL::get_initialized_face_index_map(pmesh, np);
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typedef typename internal_np::Lookup_named_param_def <
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internal_np::edge_is_constrained_t,
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|
NamedParameters,
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|
Constant_property_map<edge_descriptor, bool> // default (no constraint pmap)
|
|
> ::type ECMap;
|
|
ECMap ecmap = choose_parameter(get_parameter(np, internal_np::edge_is_constrained),
|
|
Constant_property_map<edge_descriptor, bool>(false));
|
|
|
|
typename internal::Incremental_remesher<PM, VPMap, GT, ECMap,
|
|
Constant_property_map<vertex_descriptor, bool>, // no constraint pmap
|
|
internal::Connected_components_pmap<PM, FIMap>,
|
|
FIMap
|
|
>
|
|
remesher(pmesh, vpmap, gt, false/*protect constraints*/, ecmap,
|
|
Constant_property_map<vertex_descriptor, bool>(false),
|
|
internal::Connected_components_pmap<PM, FIMap>(faces(pmesh), pmesh, ecmap, fimap, false),
|
|
fimap,
|
|
false/*need aabb_tree*/);
|
|
|
|
remesher.split_long_edges(edges, max_length);
|
|
}
|
|
|
|
template<typename PolygonMesh, typename EdgeRange>
|
|
void split_long_edges(const EdgeRange& edges
|
|
, const double& max_length
|
|
, PolygonMesh& pmesh)
|
|
{
|
|
split_long_edges(edges,
|
|
max_length,
|
|
pmesh,
|
|
parameters::all_default());
|
|
}
|
|
|
|
} //end namespace Polygon_mesh_processing
|
|
} //end namespace CGAL
|
|
|
|
#include <CGAL/enable_warnings.h>
|
|
|
|
#endif
|