Originally Posted by perna
Yeah, it's a different thing. In terms of skewing the actual shape of the floater you must have a big angle mismatch, so that's not a huge issue. But even the tiniest amount of skewing onto a surface that is supposed to be parallel will create a hard edge in the shading where the opern borders of the floater are
Hmm, still not sure I really understand, maybe post an image?
I do the little lip on just about all of my floaters and I can't say I've ever really had an issue with it. Even if the surface isn't 100% accurate it usually isn't noticeable(but I'm anal about lining that shit up), even still in actual use a very light seam from the angle being off is IMO better than a clear seam around the object when you don't use a lip... Though AA helps with that I guess.
I suppose if you have a lot of floaters to place along a complicated curved surface, its a lot quicker to do the hard edge floater thing than tweak the lip on a bunch individually, though I usually only run into a couple of those sort of floaters per asset.