Function ObjInitPositionHistory

Descent3/object.cpp:1752–1780

}

void ObjInitPositionHistory(object *obj) {
  ASSERT(Object_map_position_history[OBJNUM(obj)] == -1);

  // If it is one of the types of object's that we have to sample positions for
  // Initialize that
  switch (obj->type) {
  case OBJ_ROBOT:
  case OBJ_WEAPON:
  case OBJ_DEBRIS:
    if (Num_free_object_position_history > 0) {
      // we have a free slot
      Num_free_object_position_history--;
      int free_slot = Object_map_position_free_slots[Num_free_object_position_history];
      Object_map_position_history[OBJNUM(obj)] = free_slot;
      int i;
      for (i = 0; i < MAX_POSITION_HISTORY; i++) {
        Object_position_samples[free_slot].pos[i] = obj->pos;
      }
    } else {
      // out of slots!
      Object_map_position_history[OBJNUM(obj)] = -1;
    }
    break;
  default:
    // not saving positions
    Object_map_position_history[OBJNUM(obj)] = -1;
    break;
  }
}

void ObjFreePositionHistory(object *obj) {
  int objnum = OBJNUM(obj);