Function ClipRadPointList

editor/editor_lighting.cpp:1574–1600

// Returns number of points in clipped polygon

int ClipRadPointList(rad_point **src, rad_point **dest, int *nv, int code) {
  int plane, num = 0;
  rad_point **save_src = src, *t;
  rad_point **save_dest = dest;

  for (plane = 1; plane < 16; plane <<= 1) {
    if (plane & code) // Is this point off this plane?
    {

      *nv = ClipRadToPlane(plane, *src, *dest, *nv);
      if (*nv == 0)
        return 0;
      ASSERT(*nv >= 3);

      t = *dest;
      *dest = *src;
      *src = t;
      num++;
    }
  }

  t = *dest;
  *dest = *src;
  *src = t;

  return (*nv);
}

// Clips to a specific plane, putting resulting points in dest and returning number of points in dest
int ClipRadToPlane(int plane, rad_point *src, rad_point *dest, int nv) {