The trick with doing thing like hanging up a harness and having it drape, or piling it in a corner is one of the items on a list of "10 Challenges for Computer Graphics" in a article I saw in Computer Graphics World a few months ago. Basically, it is beyond state of the art in any program. You can do some clever stuff with P4, stuff that is impossible with P3, but it is a bit buggy. So don't toss P3 if you install P4. At least, not yet.