I've edited a nif byt taking out the floor part, like this...https://skydrive.live.com/?cid=b60c11d037429d8e#cid=B60C11D037429D8E&id=B60C11D037429D8E%21426

In game the floor is invisible/has disappeared? But the collision geometry is still there i.e. player walks over an invisible floor. How can I fix this? Thanks.