AR (Augmented Reality) & Virtual Reality (VR) applications (apps) are generally depending on computer simulation of real-life scenarios and environments. The simulation will bear a higher degree of resemblance with whatever will be depicted from real-life, either graphically or sensorially. The word 'sensorially' is broader than 'graphically' because it means everything perceptible to your senses I.e. graphics, touch, sound, voice, smell and so on. Usually, how much resemblance using the original has to be often higher and much more accurate when it comes to VR than in AR apps.
Think about the videos of your 100-metre dash through the recent Olympics. The first commentary could be in English and if so, since it is, that video will not be very thank you for visiting france. Either changing the commentary to French or adding suitable French sub-titles is likely to make it more pleasurable to a French audience. This, in essence, is where AR finds its opportunity - augmenting the first with increased useful info - inside our example, substituting French for English and therefore, making this content worth more for the French-speaking. As another example, take into account the video capture of the road accident. Two cars collide over a highway the other is badly damaged. The police most likely are not capable to pin-point which of the two drivers was in charge of the accident by merely viewing the video. If, however, the playback quality was pre-processed by an AR application that added mass, speed and direction info. of the cars towards the video, then, the one responsible might be established with near to, maybe, hundred-percent certainty.
VR (Virtual Reality), alternatively, is pretty completely different from AR. In fact, both the only share something in keeping - internet based simulation. As pointed out above, the simulation supplied by VR should be of these top quality that it's indistinguishable from reality. Theoretically, this really is impossible. Therefore, for practical purposes, VR only means a diploma of approximation, sufficient for a user to get a 'live' experience of the simulated environment. Moreover, VR is interactive and responds sensorially, in 'real-time', and as with real-life e.g. inside a VR application, imagine you have a forest, getting ready to burn a pile of cut-down bushes and dry leaves. You douse the pile with gasoline. A fox is keenly watching you from the local place. Then you definitely throw a lighted match-stick to the pile... it will respond immediately showing a strong, quickly spreading fire burning for the pile, its shape occasionally altered from the the wind... so when in real-life... the fox (scared by the fire), must back off? - and yes it does! The device may enable you to change the direction, speed and alteration from the speed in the the wind, angle of throw in the match-stick etc. and also the system will respond together with the new results immediately! Thus, VR enables anyone to try out real-life scenarios and acquire sufficiently accurate results just like though he/she were from the desired environment/ place, personally, but time savings, travel & resource costs etc.
VR applications consume awesome amounts of computing power. In contrast, AR applications aren't in any way demanding on resources - AR applications run comfortably on cell phones, tablets, other hand-helds, laptops and desktops. Very probably, you're using several AR apps on your Android/ iOS device, right now, not understanding it! (e.g. Wordlens, Wikitude World Browser etc.).
The real reason for the main difference is always that VR apps first should correctly interpret whatever action the user performed after which 'make out' the proper response how the real environment would return, detailed with animated graphics, movements within the right directions, sounds and so forth and in addition, according to correct physics, math and then any other sciences involved. Above all, 'latency', or response time from your application, needs to be sufficiently high. Or even, the person, that has feature understandably high expectations, is sure to get so completely put-off that he/she might burst out with a string of unprintable words towards the effect "to hell with this dumb thing!'. To stop such failures, your personal computer (or network of computers) furnished with unusually powerful mobile processors, high-fidelity graphics software, precision motion trackers and advanced optics, is needed. Understanding that explains, why.
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