/usr/include/CGAL/bbox_intersection_3.h is in libcgal-dev 4.11-2build1.
This file is owned by root:root, with mode 0o644.
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// Utrecht University (The Netherlands),
// ETH Zurich (Switzerland),
// INRIA Sophia-Antipolis (France),
// Max-Planck-Institute Saarbruecken (Germany),
// and Tel-Aviv University (Israel). All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 3 of the License,
// or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
//
//
// Author(s) : Geert-Jan Giezeman <geert@cs.uu.nl>
#ifndef CGAL_BBOX_INTERSECTION_3_H
#define CGAL_BBOX_INTERSECTION_3_H
#include <CGAL/Bbox_3.h>
#include <CGAL/Object.h>
namespace CGAL {
// This function intersects a bbox with a ray, line or segment
// Its essentially a copy of the function that was in Bbox_3_intersections.cpp
// But it must be a template function since the original kernel must be
// taken into account. (Michael.Hemmer@sophia.inria.fr)
template <class K>
#if CGAL_INTERSECTION_VERSION < 2
CGAL::Object
#else
typename boost::optional< boost::variant<
typename K::Segment_3,
typename K::Point_3 > >
#endif
intersection_bl(const Bbox_3 &box,
double lpx, double lpy, double lpz,
double ldx, double ldy, double ldz,
bool min_infinite, bool max_infinite)
{
typedef
#if CGAL_INTERSECTION_VERSION < 2
CGAL::Object
#else
typename
boost::optional<
boost::variant< typename K::Segment_3,
typename K::Point_3 > >
#endif
result_type;
double seg_min = 0.0, seg_max = 1.0;
// first on x value
if (ldx == 0.0) {
if (lpx < box.xmin())
return result_type();
if (lpx > box.xmax())
return result_type();
} else {
double newmin, newmax;
if (ldx > 0.0) {
newmin = (box.xmin()-lpx)/ldx;
newmax = (box.xmax()-lpx)/ldx;
} else {
newmin = (box.xmax()-lpx)/ldx;
newmax = (box.xmin()-lpx)/ldx;
}
if (min_infinite) {
min_infinite = false;
seg_min = newmin;
} else {
if (newmin > seg_min)
seg_min = newmin;
}
if (max_infinite) {
max_infinite = false;
seg_max = newmax;
} else {
if (newmax < seg_max)
seg_max = newmax;
}
if (seg_max < seg_min)
return result_type();
}
// now on y value
if (ldy == 0.0) {
if (lpy < box.ymin())
return result_type();
if (lpy > box.ymax())
return result_type();
} else {
double newmin, newmax;
if (ldy > 0.0) {
newmin = (box.ymin()-lpy)/ldy;
newmax = (box.ymax()-lpy)/ldy;
} else {
newmin = (box.ymax()-lpy)/ldy;
newmax = (box.ymin()-lpy)/ldy;
}
if (min_infinite) {
min_infinite = false;
seg_min = newmin;
} else {
if (newmin > seg_min)
seg_min = newmin;
}
if (max_infinite) {
max_infinite = false;
seg_max = newmax;
} else {
if (newmax < seg_max)
seg_max = newmax;
}
if (seg_max < seg_min)
return result_type();
}
// now on z value
if (ldz == 0.0) {
if (lpz < box.zmin())
return result_type();
if (lpz > box.zmax())
return result_type();
} else {
double newmin, newmax;
if (ldz > 0.0) {
newmin = (box.zmin()-lpz)/ldz;
newmax = (box.zmax()-lpz)/ldz;
} else {
newmin = (box.zmax()-lpz)/ldz;
newmax = (box.zmin()-lpz)/ldz;
}
if (min_infinite) {
min_infinite = false;
seg_min = newmin;
} else {
if (newmin > seg_min)
seg_min = newmin;
}
if (max_infinite) {
max_infinite = false;
seg_max = newmax;
} else {
if (newmax < seg_max)
seg_max = newmax;
}
if (seg_max < seg_min)
return result_type();
}
if (min_infinite || max_infinite) {
seg_max = 0.0;
CGAL_kernel_assertion_msg(true,
"Zero direction vector of line detected.");
}
typedef typename K::FT FT;
typedef typename K::Point_3 Point_3;
typedef typename K::Vector_3 Vector_3;
typedef typename K::Segment_3 Segment_3;
Point_3 ref_point = Point_3( FT(lpx), FT(lpy), FT(lpz));
Vector_3 dir = Vector_3( FT(ldx), FT(ldy), FT(ldz));
if (seg_max == seg_min) {
#if CGAL_INTERSECTION_VERSION < 2
return make_object(ref_point + dir * FT(seg_max));
#else
return result_type(ref_point + dir * FT(seg_max));
#endif
}
#if CGAL_INTERSECTION_VERSION < 2
return make_object(
Segment_3(ref_point + dir*FT(seg_min), ref_point + dir*FT(seg_max)));
#else
return result_type(
Segment_3(ref_point + dir*FT(seg_min), ref_point + dir*FT(seg_max)));
#endif
}
} //namespace CGAL
#endif // CGAL_BBOX_INTERSECTION_3_H
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