CGAL users discussion list

[cnng0315 <>]

Dear  Loriot : 
     thanks for your reply,it really helped me a lot.  Before your reply , I
have been confused for days about this. 
    I intended to search the tree many times with the same query point, and
each time I get the result point, I changed its extra info "bUsed", so that
the next search won't get it. 
   After reading your reply, I understood the Kd-Tree tree and the
NN_incremental_search NN are completely diffent things. NN copys the tree,
so I chaned NN's extra info, but it dosen't change the kd-tree's extra info. 
I always thouht NN just pointers of tree's point.  Did I get right meaning? 
 
Tree::iterator iterS_tree = tree.begin();
 for (;iterS_tree!=tree.end();++iterS_tree)
 {
 std::cout <<iterS_tree->x() <<"," << iterS_tree->y() <<","
<<iterS_tree->z() <<","<<iterS_tree->bUsed<<std::endl;
 }
 
It seemd there was no way to change tree's point extra info. 
 
But it dosen't matter, I changed the code,
 for (int i=0;i&lt;10;i++)
 {
  std::cout&lt;&lt;std::endl;
  NN_positive_x_iterator
it(NN.end(),point_not_used(),NN.begin()),end(NN.end(),point_not_used());
 
//each time, I get different result with the same query point. 
  for (int j=0;(j&lt;nK)&amp;&amp;(it!=end);++j,++it)
  {
   const Point&amp; p = (*it).first;
   Point&amp; pp = const_cast&lt;Point&amp;>(p);
   pp.bUsed = false;
   std::cout << p.x() <<" "<< p.y() << " " << p.z() <<std::endl;
  }
 }
 
 
   oh,thank god and you, it seemd easy, but I just began to use CGAL for a
few months, it seemd hard for me . anyway, cgal is realy powerful . 
    Are you familar with CGAL's 3d part, the demos of 3d need Geomview, but
I have compiled Geomview in windows in Cygwin.  but it failed, always,faild. 
can you give me some suggestions about how to learn cgal's 3d . Without the
demos, i don't know what the pdf help says.  I am from China, english and
math are two big problems for me.  I studied Gis andEngineering Surveying in
college, and has been do the objectarx (AutoDesk, that's why there were
errors in my code when you compile it) for years.
     I found you are skilled with cgal, how many years have you been with
it?

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