Function is_long_xz_ray

physics/findintersection.cpp:2456–2462

#define MIN_LONG_RAY (TERRAIN_SIZE * 20.0)

inline bool is_long_xz_ray(fvi_query *fq) {
  if ((fabs(fq->p0->x - fq->p1->x) > MIN_LONG_RAY) || (fabs(fq->p0->z - fq->p1->z) > MIN_LONG_RAY)) {
    return true;
  } else {
    return false;
  }
}

void check_ceiling() {
  vector hit_point;