As per this thread, an interesting discussion arose around methods of calculating displacement or buoyancy of a craft. This got me thinking, would it be possible or a good thing now we specifically have the ability to splash around to have a displacement or buoyancy indicator much like COM COL COT indicators in the VAB and SPH to tell whether a craft will be positively, neutral, or negatively buoyant as we build it, instead of having to repeatedly test or do the math.
Edit: It's just been pointed out to me that apart from a few limited applications (subs, underwater bases, and highly specialised rovers) a buoyancy indicator is largely useless, and what actually matters is not whether something will float, but where the water line is. With this in mind I'm interested to find out what people think of either a water line indicator, or a buoyancy indicator, or both, and have edited the title of the thread.
SM