public void Copy(FireData other)
 {
     Prefab       = other.Prefab;
     Field        = other.Field;
     Position     = other.Position;
     Rotation     = other.Rotation;
     Speed        = other.Speed;
     AngularSpeed = other.AngularSpeed;
     Controller   = other.Controller;
     Damage       = other.Damage;
     Group        = other.Group;
 }
 public FireBuilder WithoutGroup()
 {
     Group = null;
     return(this);
 }
 public FireBuilder InGroup(DanmakuGroup group)
 {
     Group = group;
     return(this);
 }