Vector3F.CompareTo always returns 0.

``` CSharp
public int CompareTo( Vector3I other ) {
      return Math.Sign( LengthSquared - LengthSquared );
}

public int CompareTo( Vector3F other ) {
      return Math.Sign( LengthSquared - LengthSquared );
}
```

Guessing you meant other.LengthSquared the second time?
