CGAL users discussion list

["Lehtonen, Matti/HIIT" <>]

Hi!

What does precondition
terminate called after throwing an instance of 'CGAL::Precondition_exception'
  what():  CGAL ERROR: precondition violation!
Expr: !lTopFaceExists || (lTopFaceExists && ( pt->vertex()->vertex_degree() > 
2
) )
File:
/usr/include/CGAL/Surface_mesh_simplification/halfedge_collapse_Polyhedron_3.h
Line: 55

mean in practice? How to get rid of it?

Simplification is called as
int r = CGAL::Surface_mesh_simplification::edge_collapse(
    P,
    stop, // Simple stop, until 7000 edges
    CGAL::vertex_index_map( boost::get( CGAL::vertex_external_index, P ) )
    .edge_index_map  (boost::get(CGAL::edge_external_index, P ) )
    .edge_is_border_map( constrains_map )
    .get_cost( 
CGAL::Surface_mesh_simplification::Edge_length_cost<Polyhedron>()
)
    .get_placement(
CGAL::Surface_mesh_simplification::Midpoint_placement<Polyhedron>() )
    .visitor( vis ) );

And execution goes
*** Read Polyhedron from OFF file ***
* Input - ./Polyhedron_100-LOD_GRND-DOMAIN.off
*** Polyhedron ***
* facets - 168068
* halfedges - 534714
* vertices - 100252
* is_valid - YES
*** Border of polyhedron ***
* border halfedges - 30510
* border edges - 30510
* border is_valid - YES
*** Simplification ***
                267357
0.110375        267354
0.10118         267351
...
0.163945        265166
0.168582        265164
0.149602terminate called after throwing an instance of
'CGAL::Precondition_exception'


Lehtonen, Matti


Researcher, head programmer - Helsinki Institute for Information Technology 
HIIT
http://www.hiit.fi/
-- 
Life is complex. It has real and imaginary parts.