QUOTE (Tarantula @ Sep 12 2008, 12:43 AM)

Platinum, if that were correct, Radar would work, as it is the same kind of energy that light is (electro magnetic) and would be similar to seeing infrared. Since radar doesn't work, obviously its not simply because its part of the electromagnetic spectrum, and was picked up via implant.
Unfortunately that isn't the only possible conclusion. Yes, radio waves are the same 'type' of energy as visible light / infra-red /etc. but that doesn't mean it works the same way - visible light and radio are no more 'the same thing' as blue and yellow are. It's believable enough that magic only works along one small subset of the EM spectrum, the same way the receptors in our eyes do, or a radio antenna.
Of course, the
real reason you can't use radio waves for spell LOS is game balance, but occasionally the rules inform the fluff (rather than the other way around). And since that's how the fluff works now, further rules emerge from it. It's a vicious cycle. =P
QUOTE (DireRadiant @ Sep 12 2008, 12:45 AM)

What your describing here is also the process for out of normal visual spectrum that occurs with thermographic or UV, and also with Low Light cybereye mods. Ultimately the receptor and processor is the visual cortex of the brain, where in the stream of conversion processes do we suddenly say you can't use sight to target LOS spells?
EM spectrum --> Cyber Eye (Cyber eye converts out of spectrum, and amplifies low light)--> Brain
Ultrasound --> Cyber Eye --> Brain
Ultrasound --> Cybereye --> Visual Representation --> Brain
Do we not allow targeting because the source information happens to be not in the electromagnetic spectrum?
Do we not allow targeting because there is technological processing? (But this occurs even with normal visual range sight...)
I don't have an answer, and I've seen a lot of good ones here, but the vast majority of them are just pretty good opinions on how it should work.
Several things led me to my conclusion.
We know that mages cannot target with cameras and other remote observation devices, even if they're looking through the camera at something in front of them.
We know that mages
can target using cybereyes.
This leads me to the conclusion that the cybereyes system doesn't work in the conventional way a digital camera does. I would expect, rather than having small digital cameras in them that then sent information to the brain, that they probably simply have a technological replacement for the eye's natural receptors that wire directly into the same nerves. Low-light might simply be an enhancement to the sensitivity of the receptors, thermo-imaging an expansion to their sensitive range.
Ultrasound, on the other hand, if wired directly into the nervous system, wouldn't make sense to your optical nerves - it would just be 'neural noise.' In order to present ultrasound in a manner understandable to the human eye, there has to be a significant amount of post-processing done to take the data, translate it into a 3d model, and then 'colour' the model so that the eye can make out significant features. Thus would mean not just replacing the receptors in your eye - as with standard cybervision - but also having an internal CPU, RAM and hard storage for the post-processing software, at which point you're 'seeing' the ultrasound as though through a digital camera, wich doesn't work for spell targetting.
Of course, again, I think the real reason mages can target with cybereyes is also game-balance, but hey, what are you gonna do?
So, using your symbology:
Subset of the EM spectrum (visible light with leeway to either side for IR or UV, possibly with a toggle for hypersensitivity / low-light) -> eye/cybereye -> optic nerves = LOS
Ultrasound -> cybereye ->
internal CPU -> optic nerves != LOS
And note that for ultrasound there is
no way to arrive at:
Cybereye -> optic nerves
...because your optic nerves can't process sound.
Of course, this is all arguing off the idea that spell targetting uses sight because of some facet of the 'visible light' portion of the EM spectrum, and not 'a wizard did it,' but the latter interpretation... inhibits discussion, to say the least.