e955c94ed3
Listing the "Blender Foundation" as copyright holder implied the Blender Foundation holds copyright to files which may include work from many developers. While keeping copyright on headers makes sense for isolated libraries, Blender's own code may be refactored or moved between files in a way that makes the per file copyright holders less meaningful. Copyright references to the "Blender Foundation" have been replaced with "Blender Authors", with the exception of `./extern/` since these this contains libraries which are more isolated, any changed to license headers there can be handled on a case-by-case basis. Some directories in `./intern/` have also been excluded: - `./intern/cycles/` it's own `AUTHORS` file is planned. - `./intern/opensubdiv/`. An "AUTHORS" file has been added, using the chromium projects authors file as a template. Design task: #110784 Ref !110783.
128 lines
2.4 KiB
C++
128 lines
2.4 KiB
C++
/* SPDX-FileCopyrightText: 2000 `Bruno Levy <levy@loria.fr>`
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* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*
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* The Original Code is:
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* - OGF/Graphite: Geometry and Graphics Programming Library + Utilities.
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*/
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#pragma once
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/** \file
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* \ingroup freestyle
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*/
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#include "Geom.h"
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#include "../system/FreestyleConfig.h"
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#ifdef WITH_CXX_GUARDEDALLOC
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# include "MEM_guardedalloc.h"
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#endif
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namespace Freestyle {
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using namespace Geometry;
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namespace OGF {
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template<class T> inline void ogf_swap(T &x, T &y)
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{
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T z = x;
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x = y;
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y = z;
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}
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//_________________________________________________________
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/**
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* NormalCycle evaluates the curvature tensor in function
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* of a set of dihedral angles and associated vectors.
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* Reference:
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* Restricted Delaunay Triangulation and Normal Cycle,
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* D. Cohen-Steiner and J.M. Morvan,
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* SOCG 2003
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*/
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class NormalCycle {
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public:
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void begin();
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void end();
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/**
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* NOTE: the specified edge vector needs to be pre-clipped by the neighborhood.
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*/
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void accumulate_dihedral_angle(const Vec3r &edge, real angle, real neigh_area = 1.0);
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const Vec3r &eigen_vector(int i) const
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{
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return axis_[i_[i]];
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}
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real eigen_value(int i) const
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{
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return eigen_value_[i_[i]];
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}
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const Vec3r &N() const
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{
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return eigen_vector(2);
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}
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const Vec3r &Kmax() const
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{
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return eigen_vector(1);
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}
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const Vec3r &Kmin() const
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{
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return eigen_vector(0);
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}
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real n() const
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{
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return eigen_value(2);
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}
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real kmax() const
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{
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return eigen_value(1);
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}
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real kmin() const
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{
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return eigen_value(0);
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}
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private:
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/* UNUSED */
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// real center_[3];
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Vec3r axis_[3];
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real eigen_value_[3];
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real M_[6];
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int i_[3];
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#ifdef WITH_CXX_GUARDEDALLOC
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MEM_CXX_CLASS_ALLOC_FUNCS("Freestyle:OGF:NormalCycle")
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#endif
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};
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inline void NormalCycle::accumulate_dihedral_angle(const Vec3r &edge,
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const double beta,
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double neigh_area)
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{
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double s = beta * neigh_area / edge.norm();
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M_[0] += s * edge.x() * edge.x();
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M_[1] += s * edge.x() * edge.y();
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M_[2] += s * edge.y() * edge.y();
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M_[3] += s * edge.x() * edge.z();
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M_[4] += s * edge.y() * edge.z();
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M_[5] += s * edge.z() * edge.z();
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}
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//_________________________________________________________
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} // namespace OGF
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} /* namespace Freestyle */
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