Dogcows Code - chaz/yoink/blob - src/moof/plane.cc

   1
   2 /*]  Copyright (c) 2009-2011, Charles McGarvey  [*****************************
   3 **]  All rights reserved.
   4 *
   5 * Distributable under the terms and conditions of the 2-clause BSD license;
   6 * see the file COPYING for a complete text of the license.
   7 *
   8 *****************************************************************************/
   9
  10 #include "aabb.hh"
  11 #include "plane.hh"
  12 #include "sphere.hh"
  13
  14
  15 namespace moof {
  16
  17
  18 plane::halfspace plane::intersects(const aabb3& aabb) const
  19 {
  20         int nPositive = 8;
  21         vector3 corners[8];
  22         aabb.get_corners(corners);
  23
  24         for (int i = 0; i < 8; ++i)
  25         {
  26                 if (intersects(corners[i]) == negative) --nPositive;
  27         }
  28
  29         if (nPositive == 0) return negative;
  30         else if (nPositive == 8) return positive;
  31         return intersecting;
  32 }
  33
  34 plane::halfspace plane::intersects(const sphere3& sphere) const
  35 {
  36         scalar distance = distance_to_point(sphere.point);
  37
  38         if (distance < -sphere.radius) return negative;
  39         else if (distance < sphere.radius) return intersecting;
  40         return positive;
  41 }
  42
  43
  44 } // namespace moof
  45