QUOTE (Karoline @ Nov 26 2009, 04:26 PM)

I think that daredevil vision is more like what you would get from ultra wideband radar (which can see through stuff).
That would have to be one hell of an ultra wideband radar to come out with anything more than spec representations.
Current UWB radar's that we make are only able to give top-down views with dots representing highest concentration of static in pattern groups of interest (most often human).
UWB is better used for things like cross-talking wireless communication systems rather than imaging systems.
QUOTE
And someone mentioned an image lag due to the 'slow' speed of sound, but I can't really buy that because bats use echolocation to catch insects in flight, so they must be fairly darn accurate, though I suppose that is at 'melee' ranges.
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A common fly flies around at 4.5 miles per hour.
The speed of sound is 761 mph.
The average rifle round speed is a little more than 2,000 mph.
Boxer's/MMA/Martial Arts punching speeds can reach around 20 to 30 mph.
So really...you're only lag here is something around 761 miles per hour.
There's really no lag aside from that.
Basically...anything traveling faster than just under 1/4th of a mile per second, (1,100 feet per second).
Now...here's a reference for that...
The following imagery is a guy that's holding a sign up of how far he is away.
On the left is a close up of him, and on the right is the actual view of him from that distance.
100 feet
http://www.prisonpolicy.org/images/geograp...ent/w01_100.jpg250 feet
http://www.prisonpolicy.org/images/geograp...ent/w02_250.jpg500 feet
http://www.prisonpolicy.org/images/geograp...ent/w03_500.jpg1000 feet
http://www.prisonpolicy.org/images/geograp...nt/w04_1000.jpgAnd you have to move that last distance in one second (or be capable of doing so) for you to move faster than ultrasound would pick you up.
As far as people go...that's just not going to happen.
You can't even get thrown objects to move faster than that.
Bullets are about the only things, but hell...even sighted folks have it hard against those things.
Arrows aren't even faster than you would be able to "see"; compounds can travel around 300 feet per second, and regular bows are around 170-190 feet per second.
But it's ultimately about speed of frequency and your brain's visual processing capacity and acumen...not really the speed of sound.
Human brains clock around 60Hz a second on average (slightly higher among some forms of depression and mania status brains).
And for frequency, our idea of sound (including our idea of the speed of sound on a day to day level...like the car door that we see close across the parking lot and then hear the sound of fraction of a second after) is based on a 15 to 18000Hz frequency level on average.
A bat, however, is running on around 80,000Hz+
So, if we just slap ultrasound onto someone that didn't mutate into having it, then it would be running pretty crappy with around a 78-99% decrease in cyclic rate of resolution.
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I guess it is a complimation of all these problems. A slight lag, unused to the vision, and various other small problems. I suppose this is something along the lines of why thermographic vision has a bit of problem in complete darkness (as I recall), that and a mechanical standpoint of not wanting one type of vision to be perfect in all situations.
Well...that all depends, I think, on what we're talking about.
But tech-wise, I would say it's well enough accurate representation in SR.
Natural versions in metahumanity...no idea, like I said above...I can only guess because the human hearing range isn't tailored for something like that and neither are our brain's processors...it's hard to imagine a human-like being that runs fairly alien to how humans run...visual complemented by audio, rather than audio
for sight.
I'm not even sure such a "human" mutation would inherently have a talking capable tongue.
It wouldn't have much use sense sound is being used for sight and not talking...talking would be better done in high frequency pitch shifts that create visual patterns for communication.
So yeah ... big question mark on that natural version.