CGAL users discussion list

["samuel kim" <>]

Hello,

I am using Facet_iterator in Polyhedron, and want to get very specific
facets after some modification on the original file and save it as .off
file. When I load the modified .off file, I cannot get to the same facet.
More details are as follows,
        
1. read a.off file then, write source code as follows 
   Facet_iterator pFacet = facets_begin(); 
   For(i=0;i<50;i++) // skip some facets
        pFacet++;

 Halfedge_around_facet_circulator pHalfedge; 
 pHalfedge = pFacet->facet_begin();   
 pHalfedge->prev()->vertex()->point() = Point(1.0,1.0,1.0) ; // modify
vertex
 // then save this modified mesh into am.off file 

2. read am.off
  Facet_iterator pFacet = facets_begin(); 
  For(i=0;i<50;i++) // skip some facets
        pFacet++;
 Halfedge_around_facet_circulator pHalfedge; 
 pHalfedge = pFacet->facet_begin();   
 Point& A = pHalfedge->prev()->vertex()->point() 
 // here  the problem is that point A is not the same as (1.0,1.0,1.0)
modified at previous file a.off in (1), which means that Facet_iterator
gives different point.

How can I get to the same position (same facet and vertex) when load the
file after saving the modified mesh as .off file? Any good idea, please let
me know. Thank you.

Samuel