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Fix issue #1554 

Fix a runtime error. The `Intersect_3` functor of
`Robust_intersection_traits_3_new` was ignored cases in the intersection
between a segment and a triangle.

In `ts_intersection`, if one of the extremities of the segment was
coplanar with the triangle, the empty object was always returned.

This bug of mines was introduced in CGAL-4.3 by
56d733b254.

(Fix #1554.)
This commit is contained in:
Laurent Rineau 2016-10-10 17:34:37 +02:00
parent 02b22f216e
commit 0f4661087b
5 changed files with 473 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
Mesh_3/include/CGAL/Mesh_3/Robust_intersection_traits_3.h
View File

@ -326,7 +326,19 @@ ts_intersection(const typename K::Triangle_3 &t,
return result_type();
default: // coplanar
return result_type();
// q belongs to the triangle's supporting plane
// p sees the triangle in counterclockwise order
if(orientation(p,q,a,b) != POSITIVE
&& orientation(p,q,b,c) != POSITIVE
&& orientation(p,q,c,a) != POSITIVE)
{
#if CGAL_INTERSECTION_VERSION > 1
return result_type(q);
#else
return make_object(q);
#endif
}
else return result_type();
}
case NEGATIVE:
switch ( abcq ) {
@ -352,10 +364,59 @@ ts_intersection(const typename K::Triangle_3 &t,
return result_type();
default: // coplanar
return result_type();
// q belongs to the triangle's supporting plane
// p sees the triangle in clockwise order
if(orientation(q,p,a,b) != POSITIVE
&& orientation(q,p,b,c) != POSITIVE
&& orientation(q,p,c,a) != POSITIVE)
{
#if CGAL_INTERSECTION_VERSION > 1
return result_type(q);
#else
return make_object(q);
#endif
}
else return result_type();
}
default: // coplanar
return result_type();
switch ( abcq ) {
case POSITIVE:
// q sees the triangle in counterclockwise order
if(orientation(q,p,a,b) != POSITIVE
&& orientation(q,p,b,c) != POSITIVE
&& orientation(q,p,c,a) != POSITIVE)
{
#if CGAL_INTERSECTION_VERSION > 1
return result_type(p);
#else
return make_object(p);
#endif
}
case NEGATIVE:
// q sees the triangle in clockwise order
if(orientation(p,q,a,b) != POSITIVE
&& orientation(p,q,b,c) != POSITIVE
&& orientation(p,q,c,a) != POSITIVE)
{
#if CGAL_INTERSECTION_VERSION > 1
return result_type(p);
#else
return make_object(p);
#endif
}
case COPLANAR:
// the segment is coplanar with the triangle's supporting plane
// we test whether the segment intersects the triangle in the common
// supporting plane
//
// Laurent Rineau, 2016/10/10: this case is purposely ignored by
// Mesh_3, because if the intersection is not a point, it is
// ignored anyway.
return result_type();
default: // should not happen.
CGAL_kernel_assertion(false);
return result_type();
}
}
}

1
Mesh_3/test/Mesh_3/CMakeLists.txt
View File

@ -53,6 +53,7 @@ if ( CGAL_FOUND )
create_single_source_cgal_program( "test_robust_weighted_circumcenter.cpp" )
create_single_source_cgal_program( "test_meshing_determinism.cpp" )
create_single_source_cgal_program( "test_c3t3_extract_subdomains_boundaries.cpp" )
create_single_source_cgal_program( "test_mesh_3_issue_1554.cpp" )
else()

314
Mesh_3/test/Mesh_3/data/thepart-simplified.off Normal file
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@ -0,0 +1,314 @@
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1
Mesh_3/test/Mesh_3/test_mesh_3_issue_1554.cmd Normal file
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@ -0,0 +1 @@
data/thepart-simplified.off

93
Mesh_3/test/Mesh_3/test_mesh_3_issue_1554.cpp Normal file
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@ -0,0 +1,93 @@
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Mesh_triangulation_3.h>
#include <CGAL/Mesh_complex_3_in_triangulation_3.h>
#include <CGAL/Mesh_criteria_3.h>
#include <CGAL/Polyhedral_mesh_domain_with_features_3.h>
#include <CGAL/make_mesh_3.h>
// Domain
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Polyhedral_mesh_domain_with_features_3<K> Mesh_domain;
#ifdef CGAL_CONCURRENT_MESH_3
typedef CGAL::Parallel_tag Concurrency_tag;
#else
typedef CGAL::Sequential_tag Concurrency_tag;
#endif
// Triangulation
typedef CGAL::Mesh_triangulation_3<Mesh_domain,CGAL::Default,Concurrency_tag>::type Tr;
typedef CGAL::Mesh_complex_3_in_triangulation_3<
Tr,Mesh_domain::Corner_index,Mesh_domain::Curve_segment_index> C3t3;
typedef Tr::Geom_traits Gt;
// Criteria
typedef CGAL::Mesh_criteria_3<Tr> Mesh_criteria;
// To avoid verbose function and named parameters call
using namespace CGAL::parameters;
Gt::Construct_weighted_circumcenter_3 w_circumcenter = Gt().construct_weighted_circumcenter_3_object();
K::Point_3 wc_circumcenter(Tr::Cell_handle ch, bool force_exact = false) {
return w_circumcenter(ch->vertex(0)->point(),
ch->vertex(1)->point(),
ch->vertex(2)->point(),
ch->vertex(3)->point(), force_exact
);
}
int main(int argc, char*argv[])
{
const char* fname = (argc>1)?argv[1]:"data/fandisk.off";
// Create domain
Mesh_domain domain(fname);
// Get sharp features
domain.detect_features();
// Mesh criteria
Mesh_criteria criteria(edge_size = 0.037,
facet_angle = 25,
facet_size = 0.037,
facet_distance = 0.0037,
cell_radius_edge_ratio = 3);
// Mesh generation
C3t3 c3t3 = CGAL::make_mesh_3<C3t3>(domain, criteria, no_perturb(), no_exude());
int return_code = 0;
for(C3t3::Cells_in_complex_iterator cit = c3t3.cells_in_complex_begin();
cit != c3t3.cells_in_complex_end();
++cit)
{
for(int i = 0; i < 4; ++i) {
typedef Tr::Facet Facet;
typedef Tr::Cell_handle Cell_handle;
Cell_handle ch = cit;
Cell_handle nch = ch->neighbor(i);
if(c3t3.is_in_complex(nch)) continue;
if(!c3t3.is_in_complex(Facet(ch, i))) {
return_code = 1;
std::cout << "ERROR with facet: 3 \n";
K::Point_3 p[3];
for(int j = 0; j < 3; ++j) {
p[j] = ch->vertex(c3t3.triangulation().vertex_triple_index(i, j))->point().point();
std::cout << " " << p[j] << "\n";
}
int n_i = nch->index(ch);
K::Point_3 a = ch->vertex(i)->point().point();
K::Point_3 b = nch->vertex(n_i)->point().point();
std::cout << a << "\n";
std::cout << b << "\n";
std::cout << " " << wc_circumcenter(ch, true) << std::endl;
std::cout << " " << wc_circumcenter(nch, true) << std::endl;
}
}
}
std::cout << c3t3.triangulation().number_of_vertices() << std::endl;
// Output
return return_code;
}