Loading...
Searching...
No Matches
LongestEdgeT.hh
Go to the documentation of this file.
/* ========================================================================= *
* *
* OpenMesh *
* Copyright (c) 2001-2025, RWTH-Aachen University *
* Department of Computer Graphics and Multimedia *
* All rights reserved. *
* www.openmesh.org *
* *
*---------------------------------------------------------------------------*
* This file is part of OpenMesh. *
*---------------------------------------------------------------------------*
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions *
* are met: *
* *
* 1. Redistributions of source code must retain the above copyright notice, *
* this list of conditions and the following disclaimer. *
* *
* 2. Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the distribution. *
* *
* 3. Neither the name of the copyright holder nor the names of its *
* contributors may be used to endorse or promote products derived from *
* this software without specific prior written permission. *
* *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, *
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, *
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR *
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING *
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS *
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
* *
* ========================================================================= */
//=============================================================================
//
// CLASS LongestEdgeT
//
//=============================================================================
#ifndef LINEAR_H
#define LINEAR_H
#include <OpenMesh/Tools/Subdivider/Uniform/SubdividerT.hh>
#include <OpenMesh/Core/Utils/vector_cast.hh>
#include <OpenMesh/Core/Utils/Property.hh>
// -------------------- STL
#include <vector>
#include <queue>
#if defined(OM_CC_MIPS)
# include <math.h>
#else
# include <cmath>
#endif
//== NAMESPACE ================================================================
namespace OpenMesh { // BEGIN_NS_OPENMESH
namespace Subdivider { // BEGIN_NS_DECIMATER
namespace Uniform { // BEGIN_NS_UNIFORM
//== CLASS DEFINITION =========================================================
template <typename MeshType, typename RealType = double>
class CompareLengthFunction {
public:
typedef std::pair<typename MeshType::EdgeHandle, RealType> queueElement;
bool operator()(const queueElement& t1, const queueElement& t2) // Returns true if t1 is smaller than t2
{
return (t1.second < t2.second);
}
};
template <typename MeshType, typename RealType = float>
class LongestEdgeT : public SubdividerT<MeshType, RealType>
{
public:
typedef RealType real_t;
typedef MeshType mesh_t;
typedef SubdividerT< mesh_t, real_t > parent_t;
typedef std::vector< std::vector<real_t> > weights_t;
typedef std::vector<real_t> weight_t;
typedef std::pair< typename mesh_t::EdgeHandle, real_t > queueElement;
public:
LongestEdgeT() : parent_t()
{ }
LongestEdgeT( mesh_t& _m) : parent_t(_m)
{ }
~LongestEdgeT() {}
public:
const char *name() const { return "Longest Edge Split"; }
void set_max_edge_length(double _value) {
max_edge_length_squared_ = _value * _value;
}
protected:
bool prepare( mesh_t& _m )
{
return true;
}
bool cleanup( mesh_t& _m )
{
return true;
}
bool subdivide( MeshType& _m, size_t _n , const bool _update_points = true)
{
// Sorted queue containing all edges sorted by their decreasing length
std::priority_queue< queueElement, std::vector< queueElement > , CompareLengthFunction< mesh_t, real_t > > queue;
// Build the initial queue
// First element should be longest edge
typename mesh_t::EdgeIter edgesEnd = _m.edges_end();
for ( typename mesh_t::EdgeIter eit = _m.edges_begin(); eit != edgesEnd; ++eit) {
const typename MeshType::Point to = _m.point(_m.to_vertex_handle(_m.halfedge_handle(*eit,0)));
const typename MeshType::Point from = _m.point(_m.from_vertex_handle(_m.halfedge_handle(*eit,0)));
real_t length = sqrnorm(to - from);
// Only push the edges that need to be split
if ( length > max_edge_length_squared_ )
queue.push( queueElement(*eit,length) );
}
bool stop = false;
while ( !stop && ! queue.empty() ) {
queueElement a = queue.top();
queue.pop();
if ( a.second < max_edge_length_squared_ ) {
stop = true;
break;
} else {
const typename MeshType::Point to = _m.point(_m.to_vertex_handle(_m.halfedge_handle(a.first,0)));
const typename MeshType::Point from = _m.point(_m.from_vertex_handle(_m.halfedge_handle(a.first,0)));
const typename MeshType::Point midpoint = static_cast<typename MeshType::Point::value_type>(0.5) * (to + from);
const typename MeshType::VertexHandle newVertex = _m.add_vertex(midpoint);
_m.split(a.first,newVertex);
for ( typename MeshType::VertexOHalfedgeIter voh_it(_m,newVertex); voh_it.is_valid(); ++voh_it) {
typename MeshType::EdgeHandle eh = _m.edge_handle(*voh_it);
const typename MeshType::Point to = _m.point(_m.to_vertex_handle(*voh_it));
const typename MeshType::Point from = _m.point(_m.from_vertex_handle(*voh_it));
real_t length = sqrnorm(to - from);
// Only push the edges that need to be split
if ( length > max_edge_length_squared_ )
queue.push( queueElement(eh,length) );
}
}
}
#if defined(_DEBUG) || defined(DEBUG)
// Now we have an consistent mesh!
assert( OpenMesh::Utils::MeshCheckerT<mesh_t>(_m).check() );
#endif
return true;
}
private: // data
real_t max_edge_length_squared_;
};
} // END_NS_UNIFORM
} // END_NS_SUBDIVIDER
} // END_NS_OPENMESH
#endif
SubdividerT.hh
OpenMesh
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition MeshItems.hh:59
OpenMesh::PolyMeshT::EdgeIter
Kernel::EdgeIter EdgeIter
Scalar type.
Definition PolyMeshT.hh:145
OpenMesh::Subdivider::Uniform::CompareLengthFunction
Definition LongestEdgeT.hh:80
OpenMesh::Subdivider::Uniform::LongestEdgeT
Uniform LongestEdgeT subdivision algorithm
Definition LongestEdgeT.hh:100
OpenMesh::Subdivider::Uniform::LongestEdgeT::prepare
bool prepare(mesh_t &_m)
Prepare mesh, e.g.
Definition LongestEdgeT.hh:138
OpenMesh::Subdivider::Uniform::LongestEdgeT::cleanup
bool cleanup(mesh_t &_m)
Cleanup mesh after usage, e.g. remove added properties.
Definition LongestEdgeT.hh:144
OpenMesh::Subdivider::Uniform::LongestEdgeT::name
const char * name() const
Return name of subdivision algorithm.
Definition LongestEdgeT.hh:129
OpenMesh::Subdivider::Uniform::LongestEdgeT::subdivide
bool subdivide(MeshType &_m, size_t _n, const bool _update_points=true)
Subdivide mesh _m _n times.
Definition LongestEdgeT.hh:150
OpenMesh::Subdivider::Uniform::SubdividerT
Abstract base class for uniform subdivision algorithms.
Definition SubdividerT.hh:89
OpenMesh::Utils::MeshCheckerT
Check integrity of mesh.
Definition MeshCheckerT.hh:74