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Fix Segment_3-Sphere_3 do intersect: detect fully contained segments

This commit is contained in:
Mael Rouxel-Labbé 2021-06-28 13:26:28 +02:00
parent 65b7d11acd
commit 6b6ab287a8
2 changed files with 29 additions and 9 deletions
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29
Intersections_3/include/CGAL/Intersections_3/internal/Segment_3_Sphere_3_do_intersect.h
View File

@ -28,12 +28,33 @@ do_intersect(const typename K::Sphere_3& sp,
const K& k)
{
typedef typename K::RT RT;
RT num, den;
typedef typename K::Bounded_side Bounded_side;
typename K::Bounded_side_3 bounded_side = k.bounded_side_3_object();
typename K::Compute_squared_radius_3 sq_radius = k.compute_squared_radius_3_object();
typename K::Construct_center_3 center = k.construct_center_3_object();
typename K::Construct_source_3 source = k.construct_source_3_object();
typename K::Construct_target_3 target = k.construct_target_3_object();
const Bounded_side source_side = bounded_side(sp, source(seg));
const Bounded_side target_side = bounded_side(sp, target(seg));
if(source_side != target_side)
return true;
else if(source_side == ON_BOUNDED_SIDE) // else if ==> both extremities are on the same side
return false;
else if(source_side == ON_BOUNDARY)
return true;
CGAL_kernel_assertion(source_side == ON_UNBOUNDED_SIDE && target_side == ON_UNBOUNDED_SIDE);
// Both out can still be intersecting the sphere
RT num, den;
CGAL::internal::squared_distance_RT(center(sp), seg, num, den, k);
CGAL::internal::squared_distance_RT(sp.center(), seg, num, den, k);
return !(compare_quotients<RT>(num, den,
Rational_traits<typename K::FT>().numerator(sp.squared_radius()),
Rational_traits<typename K::FT>().denominator(sp.squared_radius())) == LARGER);
Rational_traits<typename K::FT>().numerator(sq_radius(sp)),
Rational_traits<typename K::FT>().denominator(sq_radius(sp))) == LARGER);
}
template <class K>

9
Intersections_3/test/Intersections_3/test_intersections_Segment_3.cpp
View File

@ -68,16 +68,17 @@ public:
// see segment_segment.cpp
}
// @fixme EPICK
void S_Sph()
{
std::cout << "Segment - Sphere\n";
// No intersection
check_do_not_intersect(S(p(4,1,9), p(4,6,-1)), Sph(p(9,2,4), 1));
check_do_not_intersect(S(p(-2,3,4), p(1,2,-1)), Sph(p(9,2,4), 10000));
check_do_not_intersect(S(p(-2,3,4), p(1,2,-1)), Sph(p(9,2,4), 10000));
check_do_intersect(S(p(0,1,0), p(2,1,0)), Sph(p(1,0,0), 1));
check_do_intersect(S(p(-2,3,4), p(1,2,-1)), Sph(p(9,2,4), 100));
check_do_intersect(S(p(-2,3,4), p(3,2,-5)), Sph(p(9,2,4), 100));
for(int i=0; i<N; ++i)
{
@ -92,8 +93,6 @@ public:
Sph sph(c, sqr);
if(sph.oriented_side(s0) != sph.oriented_side(s1))
check_do_intersect(sph, S(s0, s1));
else
check_do_not_intersect(sph, S(s0, s1));
}
}
@ -182,7 +181,7 @@ public:
std::cout << "3D Segment Intersection tests\n";
S_S();
// S_Sph(); // @fixme
S_Sph();
S_Tet();
S_Tr();
}