CGAL users discussion list

[Claus Volko <>]

OK, it seems I've found it out myself by now:

  for (Region_growing::Primitive_and_region region : regions)
  {
      Line_3* l = new Line_3(Point_3(0, -10, 0), Point_3(0, +10, 0));

      if (CGAL::intersection(region.first, *l))
      {
          std::cout << "Region has point on it" << std::endl;
          break;
      }
  }

Am Mi., 13. Sept. 2023 um 09:39 Uhr schrieb Claus Volko <>:

OK, I've realized by now that the code I posted was not wrong but that what I really need is to check if a line intersects with a region, as I don't know the y coordinate of the point I'm looking for. How can that be done?

Am Mi., 13. Sept. 2023 um 07:04 Uhr schrieb Claus Volko <>:

I would like to find the region that contains a given point after using the region growing algorithm for shape detection. I tried this code but it does not seem to work:

  for (Region_growing::Primitive_and_region region : regions)
  {
      Point_3 *point = new Point_3(0, 0, 0);
      if (region.first.has_on(*point))
          std::cout << "Region has zero point on it" << std::endl;
  }

Also, if I found a region, how can I access the information about the boundaries of the region?

--

Dipl.-Ing. Dr. Claus D. Volko, BSc
http://www.cdvolko.net/

--

Dipl.-Ing. Dr. Claus D. Volko, BSc
http://www.cdvolko.net/

--

Dipl.-Ing. Dr. Claus D. Volko, BSc
http://www.cdvolko.net/