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ModAspectRatioT_impl.hh
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//=============================================================================
//
// CLASS ModAspectRatioT - IMPLEMENTATION
//
//=============================================================================
#define OPENMESH_DECIMATER_MODASPECTRATIOT_C
//== INCLUDES =================================================================
#include "ModAspectRatioT.hh"
//== NAMESPACES ===============================================================
namespace OpenMesh {
namespace Decimater {
//== IMPLEMENTATION ==========================================================
template<class MeshT>
typename ModAspectRatioT<MeshT>::Scalar ModAspectRatioT<MeshT>::aspectRatio(
const Point& _v0, const Point& _v1, const Point& _v2) {
Point d0 = _v0 - _v1;
Point d1 = _v1 - _v2;
// finds the max squared edge length
Scalar l2, maxl2 = d0.sqrnorm();
if ((l2 = d1.sqrnorm()) > maxl2)
maxl2 = l2;
// keep searching for the max squared edge length
d1 = _v2 - _v0;
if ((l2 = d1.sqrnorm()) > maxl2)
maxl2 = l2;
// squared area of the parallelogram spanned by d0 and d1
Scalar a2 = (d0 % d1).sqrnorm();
// the area of the triangle would be
// sqrt(a2)/2 or length * height / 2
// aspect ratio = length / height
// = length * length / (2*area)
// = length * length / sqrt(a2)
// returns the length of the longest edge
// divided by its corresponding height
return sqrt((maxl2 * maxl2) / a2);
}
//-----------------------------------------------------------------------------
template<class MeshT>
void ModAspectRatioT<MeshT>::initialize() {
typename Mesh::FaceIter f_it, f_end(mesh_.faces_end());
typename Mesh::FVIter fv_it;
for (f_it = mesh_.faces_begin(); f_it != f_end; ++f_it) {
fv_it = mesh_.fv_iter(*f_it);
typename Mesh::Point& p0 = mesh_.point(*fv_it);
typename Mesh::Point& p1 = mesh_.point(*(++fv_it));
typename Mesh::Point& p2 = mesh_.point(*(++fv_it));
mesh_.property(aspect_, *f_it) = static_cast<typename Mesh::Scalar>(1.0) / aspectRatio(p0, p1, p2);
}
}
//-----------------------------------------------------------------------------
template<class MeshT>
void ModAspectRatioT<MeshT>::preprocess_collapse(const CollapseInfo& _ci) {
typename Mesh::FaceHandle fh;
typename Mesh::FVIter fv_it;
for (typename Mesh::VFIter vf_it = mesh_.vf_iter(_ci.v0); vf_it.is_valid(); ++vf_it) {
fh = *vf_it;
if (fh != _ci.fl && fh != _ci.fr) {
fv_it = mesh_.fv_iter(fh);
typename Mesh::Point& p0 = mesh_.point(*fv_it);
typename Mesh::Point& p1 = mesh_.point(*(++fv_it));
typename Mesh::Point& p2 = mesh_.point(*(++fv_it));
mesh_.property(aspect_, fh) = static_cast<typename Mesh::Scalar>(1.0) / aspectRatio(p0, p1, p2);
}
}
}
//-----------------------------------------------------------------------------
template<class MeshT>
float ModAspectRatioT<MeshT>::collapse_priority(const CollapseInfo& _ci) {
typename Mesh::VertexHandle v2, v3;
typename Mesh::FaceHandle fh;
const typename Mesh::Point* p1(&_ci.p1);
typename Mesh::Scalar r0, r1, r0_min(1.0), r1_min(1.0);
typename Mesh::ConstVertexOHalfedgeIter voh_it(mesh_, _ci.v0);
v3 = mesh_.to_vertex_handle(*voh_it);
auto p3 = &mesh_.point(v3);
while (voh_it.is_valid()) {
v2 = v3;
auto p2 = p3;
++voh_it;
v3 = mesh_.to_vertex_handle(*voh_it);
p3 = &mesh_.point(v3);
fh = mesh_.face_handle(*voh_it);
// if not boundary
if (fh.is_valid()) {
// aspect before
if ((r0 = mesh_.property(aspect_, fh)) < r0_min)
r0_min = r0;
// aspect after
if (!(v2 == _ci.v1 || v3 == _ci.v1))
if ((r1 = static_cast<typename Mesh::Scalar>(1.0) / aspectRatio(*p1, *p2, *p3)) < r1_min)
r1_min = r1;
}
}
if (Base::is_binary()) {
return
((r1_min > r0_min) || (r1_min > min_aspect_)) ? float(Base::LEGAL_COLLAPSE) :
float(Base::ILLEGAL_COLLAPSE);
} else {
if (r1_min > r0_min)
return 1.f - float(r1_min);
else
return
(r1_min > min_aspect_) ? 2.f - float(r1_min) : float(Base::ILLEGAL_COLLAPSE);
}
}
//-----------------------------------------------------------------------------
template<class MeshT>
void ModAspectRatioT<MeshT>::set_error_tolerance_factor(double _factor) {
if (_factor >= 0.0 && _factor <= 1.0) {
// the smaller the factor, the larger min_aspect_ gets
// thus creating a stricter constraint
// division by (2.0 - error_tolerance_factor_) is for normalization
float min_aspect = min_aspect_ * (2.f - float(_factor)) / (2.f - float(this->error_tolerance_factor_));
set_aspect_ratio(1.f/min_aspect);
this->error_tolerance_factor_ = _factor;
}
}
//=============================================================================
}
}
//=============================================================================
ModAspectRatioT.hh
OpenMesh
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition MeshItems.hh:59
OpenMesh::PolyMeshT::VertexHandle
Kernel::VertexHandle VertexHandle
Handle for referencing the corresponding item.
Definition PolyMeshT.hh:136
OpenMesh::PolyMeshT::Scalar
Kernel::Scalar Scalar
Scalar type.
Definition PolyMeshT.hh:110
OpenMesh::PolyMeshT::FaceIter
Kernel::FaceIter FaceIter
Scalar type.
Definition PolyMeshT.hh:146
OpenMesh::PolyMeshT::FaceHandle
Kernel::FaceHandle FaceHandle
Scalar type.
Definition PolyMeshT.hh:139
OpenMesh::PolyMeshT::ConstVertexOHalfedgeIter
Kernel::ConstVertexOHalfedgeIter ConstVertexOHalfedgeIter
Circulator.
Definition PolyMeshT.hh:173
OpenMesh::PolyMeshT::Point
Kernel::Point Point
Coordinate type.
Definition PolyMeshT.hh:112
OpenMesh::Decimater::ModAspectRatioT::preprocess_collapse
void preprocess_collapse(const CollapseInfo &_ci) override
update aspect ratio of one-ring
Definition ModAspectRatioT_impl.hh:113
OpenMesh::Decimater::ModAspectRatioT::collapse_priority
float collapse_priority(const CollapseInfo &_ci) override
Returns the collapse priority.
Definition ModAspectRatioT_impl.hh:133
OpenMesh::Decimater::ModAspectRatioT::set_error_tolerance_factor
void set_error_tolerance_factor(double _factor) override
set percentage of aspect ratio
Definition ModAspectRatioT_impl.hh:183
OpenMesh::Decimater::ModAspectRatioT::initialize
void initialize() override
precompute face aspect ratio
Definition ModAspectRatioT_impl.hh:96