Dogcows Code - chaz/yoink/blob - src/Moof/Plane.cc

   1
   2 /*]  Copyright (c) 2009-2010, Charles McGarvey  [**************************
   3 **]  All rights reserved.
   4 *
   5 * vi:ts=4 sw=4 tw=75
   6 *
   7 * Distributable under the terms and conditions of the 2-clause BSD license;
   8 * see the file COPYING for a complete text of the license.
   9 *
  10 **************************************************************************/
  11
  12 #include "Aabb.hh"
  13 #include "Plane.hh"
  14 #include "Sphere.hh"
  15
  16
  17 namespace Mf {
  18
  19
  20 Plane::Halfspace Plane::intersects(const Aabb<3>& aabb) const
  21 {
  22         Vector3 corners[8];
  23         int nPositive = 8;
  24
  25         aabb.getCorners(corners);
  26
  27         for (int i = 0; i < 8; ++i)
  28         {
  29                 if (intersects(corners[i]) == NEGATIVE)
  30                 {
  31                         --nPositive;
  32                 }
  33         }
  34
  35         if (nPositive == 0)      return NEGATIVE;
  36         else if (nPositive == 8) return POSITIVE;
  37         else                     return INTERSECT;
  38 }
  39
  40 Plane::Halfspace Plane::intersects(const Sphere<3>& sphere) const
  41 {
  42         Scalar distance = getDistanceToPoint(sphere.point);
  43
  44         if (distance < -sphere.radius)     return NEGATIVE;
  45         else if (distance < sphere.radius) return INTERSECT;
  46         else                               return POSITIVE;
  47 }
  48
  49
  50 } // namespace Mf
  51