Frustum AABB Intersect

FrustumAABBIntersect.cpp

// Returns: INTERSECT : 0 
//          INSIDE : 1 
//          OUTSIDE : 2 
int FrustumAABBIntersect(Plane *planes, Vector &mins, Vector &maxs) { 
   int    ret = INSIDE; 
   Vector vmin, vmax; 

   for(int i = 0; i < 6; ++i) { 
      // X axis 
      if(planes[i].normal.x > 0) { 
         vmin.x = mins.x; 
         vmax.x = maxs.x; 
      } else { 
         vmin.x = maxs.x; 
         vmax.x = mins.x; 
      } 
      // Y axis 
      if(planes[i].normal.y > 0) { 
         vmin.y = mins.y; 
         vmax.y = maxs.y; 
      } else { 
         vmin.y = maxs.y; 
         vmax.y = mins.y; 
      } 
      // Z axis 
      if(planes[i].normal.z > 0) { 
         vmin.z = mins.z; 
         vmax.z = maxs.z; 
      } else { 
         vmin.z = maxs.z; 
         vmax.z = mins.z; 
      } 
      if(Vector::DotProduct(planes[i].normal, vmin) + planes[i].d > 0) 
         return OUTSIDE; 
      if(Vector::DotProduct(planes[i].normal, vmax) + planes[i].d >= 0) 
         ret = INTERSECT; 
   } 
   return ret;
}