Function fvi_room

physics/findintersection.cpp:4453–4865

}

int fvi_room(int room_index, int from_portal, int room_obj) {
  vector hit_point; // where we hit
  float cur_dist;   // distance to hit point
  const room *cur_room = &Rooms[room_index];
  int16_t i;
  int next_portals[MAX_NEXT_PORTALS];
  int num_next_portals = 0;
  int next_portal_index;
  int portal_num;
  //	vector col_point[32];
  //	vector col_normal[32];
  int num_cols = 0;
  object *this_obj;
  uint8_t msector = 0;

  if (fvi_min_xyz.x <= cur_room->bbf_min_xyz.x) {
    msector |= 0x01;
  }
  if (fvi_min_xyz.y <= cur_room->bbf_min_xyz.y) {
    msector |= 0x02;
  }
  if (fvi_min_xyz.z <= cur_room->bbf_min_xyz.z) {
    msector |= 0x04;
  }
  if (fvi_max_xyz.x >= cur_room->bbf_max_xyz.x) {
    msector |= 0x08;
  }
  if (fvi_max_xyz.y >= cur_room->bbf_max_xyz.y) {
    msector |= 0x10;
  }
  if (fvi_max_xyz.z >= cur_room->bbf_max_xyz.z) {
    msector |= 0x20;
  }

  if (fvi_query_ptr->thisobjnum >= 0)
    this_obj = &Objects[fvi_query_ptr->thisobjnum];
  else
    this_obj = nullptr;

  ASSERT(room_index >= 0 && room_index <= Highest_room_index);
  ASSERT(Rooms[room_index].used);
  ASSERT((fvi_visit_list[room_index >> 3] & (0x01 << (room_index % 8))) == 0);

  if (!(cur_room->flags & RF_EXTERNAL)) {
    fvi_visit_list[room_index >> 3] |= 0x01 << (room_index % 8);
    fvi_rooms_visited[fvi_num_rooms_visited] = room_index;
    fvi_num_rooms_visited++;

    ASSERT(fvi_num_rooms_visited <= MAX_ROOMS);
  }

  if (fvi_query_ptr->flags & FQ_IGNORE_WALLS) {
    vector face_normal;
    vector *vertex_ptr_list[MAX_VERTS_PER_FACE];
    int16_t count;
    bool f_backface;
    int face_info;
    int j; //, k;