Softimage Xsi: Displacement

Could somebody tell me how to use the lenght/distance/angle displacement settings? I'm working on a terrain, and I'm trying to use displacement to add in the details . I'm guessing that using this method of displacement subdivision would subdivide more closer then the camera then further off, right? I just can't seem to figure out how the controls work :rolleyes:. If anybody knows how to do this, it would be great !


Thanks a lot !

-Jsh3d