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/* SPDX-License-Identifier: GPL-2.0-or-later
* The Original Code is:
* OGF/Graphite: Geometry and Graphics Programming Library + Utilities
* Copyright 2000 Bruno Levy <levy@loria.fr> */
#pragma once
/** \file
* \ingroup freestyle
*/
#include "Geom.h"
#include "../system/FreestyleConfig.h"
#ifdef WITH_CXX_GUARDEDALLOC
# include "MEM_guardedalloc.h"
#endif
namespace Freestyle {
using namespace Geometry;
namespace OGF {
template<class T> inline void ogf_swap(T &x, T &y)
{
T z = x;
x = y;
y = z;
}
//_________________________________________________________
/**
* NormalCycle evaluates the curvature tensor in function
* of a set of dihedral angles and associated vectors.
* Reference:
* Restricted Delaunay Triangulation and Normal Cycle,
* D. Cohen-Steiner and J.M. Morvan,
* SOCG 2003
*/
class NormalCycle {
public:
void begin();
void end();
/**
* NOTE: the specified edge vector needs to be pre-clipped by the neighborhood.
*/
void accumulate_dihedral_angle(const Vec3r &edge, real angle, real neigh_area = 1.0);
const Vec3r &eigen_vector(int i) const
{
return axis_[i_[i]];
}
real eigen_value(int i) const
{
return eigen_value_[i_[i]];
}
const Vec3r &N() const
{
return eigen_vector(2);
}
const Vec3r &Kmax() const
{
return eigen_vector(1);
}
const Vec3r &Kmin() const
{
return eigen_vector(0);
}
real n() const
{
return eigen_value(2);
}
real kmax() const
{
return eigen_value(1);
}
real kmin() const
{
return eigen_value(0);
}
private:
/* UNUSED */
// real center_[3];
Vec3r axis_[3];
real eigen_value_[3];
real M_[6];
int i_[3];
#ifdef WITH_CXX_GUARDEDALLOC
MEM_CXX_CLASS_ALLOC_FUNCS("Freestyle:OGF:NormalCycle")
#endif
};
inline void NormalCycle::accumulate_dihedral_angle(const Vec3r &edge,
const double beta,
double neigh_area)
{
double s = beta * neigh_area / edge.norm();
M_[0] += s * edge.x() * edge.x();
M_[1] += s * edge.x() * edge.y();
M_[2] += s * edge.y() * edge.y();
M_[3] += s * edge.x() * edge.z();
M_[4] += s * edge.y() * edge.z();
M_[5] += s * edge.z() * edge.z();
}
//_________________________________________________________
} // namespace OGF
} /* namespace Freestyle */
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