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 amount of resemblance with whatever will be depicted from real-life, either graphically or sensorially. The word 'sensorially' is broader than 'graphically' given it means as much as possible perceptible to senses I.e. graphics, touch, sound, voice, smell and the like. Usually, the quality of resemblance together with the original must be often times higher and much more accurate when it comes to VR when compared to AR apps.
Consider the videos of an 100-metre dash from the recent Olympic Games. The first commentary could be in English therefore, since it is, that video are not very thank you for visiting french. Either changing the commentary to French or adding suitable French sub-titles can make it more pleasurable to some French audience. This, essentially, is how AR finds its opportunity - augmenting the main with more useful info - in our example, substituting French for English and thus, making this content worth more for the French-speaking. As the second example, consider the video capture of an road accident. Two cars collide over a highway and one is badly damaged. Law enforcement is probably not able to pin-point which of these two drivers was accountable for the accident merely by viewing the recording. If, however, the playback quality was pre-processed by an AR application that added mass, speed and direction info. with the cars for the video, then, the main one responsible could possibly be established with all-around, maybe, hundred-percent certainty.
VR (Virtual Reality), however, is quite distinctive from AR. The truth is, the two only share a very important factor alike - computer based simulation. As stated before, the simulation supplied by VR needs to be of which top quality that it must be indistinguishable from reality. Theoretically, that is impossible. Therefore, for practical purposes, VR only means a diploma of approximation, sufficient to get a user to get a 'live' experience with the simulated environment. Moreover, VR is interactive and responds sensorially, in 'real-time', and merely such as real-life e.g. inside a VR application, imagine you're in a forest, on the point of burn a pile of cut-down bushes and dry leaves. You douse the pile with gasoline. A fox is keenly watching you a nearby place. Then you throw a lighted match-stick on to the pile... the system will respond immediately showing a solid, quickly spreading fire burning about the pile, its shape occasionally altered through the breeze... and as in real-life... the fox (scared from the fire), must hightail it? - and it does! The device may let you affect the direction, speed and alteration within the speed with the wind flow, angle of throw from the match-stick etc. and the system will respond using the new results immediately! Thus, VR enables someone to try out real-life scenarios and obtain sufficiently accurate results equally as though he/she were inside the desired environment/ place, in person, but not waste time, travel & resource costs etc.
VR applications consume awesome numbers of computing power. In contrast, AR applications aren't whatsoever demanding on resources - AR applications run comfortably on cell phones, tablets, other hand-helds, laptops and desktops. Very probably, you use a couple of AR apps on the Android/ iOS device, at this time, lacking the knowledge of it! (e.g. Wordlens, Wikitude World Browser etc.).
The real reason for the main difference is the fact that VR apps first must correctly interpret whatever action the consumer performed then 'make out' the correct response the real environment would return, full of animation, movements within the right directions, sounds and so on and also, as per correct physics, math and any other sciences involved. Most of all, 'latency', or perhaps the response time in the application, should be sufficiently high. Or else, the user, who's feature understandably high expectations, will most likely get so completely put-off that he/she might burst by helping cover their a string of unprintable words on the effect "to hell using this dumb thing!'. To prevent such failures, your personal computer (or network of computers) built with unusually powerful mobile processors, high-fidelity graphics software, precision motion trackers and advanced optics, is needed. Which explains, why.
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