Re: Business Tour - Board Game With Online Multiplayer Download Highly Compressed Rar
Oleta Blaylock
I'm currently planning a simple online multiplayer game. And here is the question. Does it make sense to make the whole game logic on the server and just send the input from the client to the server? Which are the pros and the cons or are there any reasons why I shouldn't do that?
Business Tour - Board Game with Online Multiplayer download highly compressed rar
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Likewise you don't necessarily want to send back everything the client needs to do. For example, you can send some kind of message saying "NPC X died", and the client determines what animation/sounds to play. Stuff like that.
The trick is to find the line where bandwidth and processing power (on the server) is trumped by preventing people from cheating. Usually you make any kind of game-changing authoritative decision on the server only, and leave all the ancillary visual stuff to the client.
I did couple of multiplayer games for some distributed network game design course. The most challenging was doing a realtime action game where many players involved and sending inputs like hell. When it comes to that point, everything becomes problem. As you see the first link Tetrat sent, even determining a collusion becomes a problem. And you will read-hear terms like lag, interpolation, extrapolation, prediction... But if you never tried yourself coding from scratch, you will just accept these words and wouldn't know what they really mean.
Step 1
Just start with fully authorized server based design for now. As you said, just send user inputs to server and let server do everything and clients get the results. Your game will work fully consistent. But when you look at your clients, you will notice some lags, some teleport problems, not smooth movement...ect.
Step 2
Start fixing the issues on client side. The teleporting problems for example. Your character was at (0,0) and server said now you are at (100,100). Your character will just teleport to (100,100) which is not nice. There comes the interpolation. You should have a code in client side which will slide the character from (0,0) to (100, 100) in a smooth way. Yes, you will move your character from (0,0) to (100,100) but how fast? For now you can just use the time difference between each server update. If your server sends 10 packets in a second which means 100 ms delay between each packet.
Step 3
Now your game is already good for fast networks where there is delay of (1-50)ms. But it gets doomed if there is a packet loss, high latency or calculation takes long in server...ect. In those situations you will notice when you press left arrow, you will see your character moving left with a delay of 200 ms. The delay between your packet goes to server, calculation time and comes back to you with your last position. This is bad, the worst disadvantage of server authorized design. Player wants his character move left as soon as he presses left, you can't make him wait. Luckily client also have the same code as server, so why not execute it on client immediately and fix the final result with the answer from server? Thats what basicly input prediction is. Client presses left, the code in his side will move him to left, after some time lets say 200 ms, the real position comes from server and client corrects its position with it. If everything went allright, client won't notice anything, "step 2" will also help us with this.
Depends on what game you want to create and what part of the game.If developing an RTS (or any game with a lockstepped model), then you definitely should only send the input and which simulation step the input was recieved.
If you want to do a shooter you could use both input and abstract functions. If you take Unreal Tournament 3 as the case, they created the multiplayer mainly via replicated function calls.
For movement they take the player input( compressed into a single bit for each action) delta rotation, acceleration & timestamp and send it to the server.
For other purposes like weapon they synchronize when you shoot (AFAIK, havn't looked into this part in depth yet).
For more static / less often changed values like health they send the variable to the client or server depending on what the programmer specified.
Virtual reality (VR) is a simulated experience that employs 3D near-eye displays and pose tracking to give the user an immersive feel of a virtual world. Applications of virtual reality include entertainment (particularly video games), education (such as medical, safety or military training) and business (such as virtual meetings). VR is one of the key technologies in the reality-virtuality continuum. As such, it is different from other digital visualization solutions, such as augmented virtuality and augmented reality.[2]
Currently, standard virtual reality systems use either virtual reality headsets or multi-projected environments to generate some realistic images, sounds and other sensations that simulate a user's physical presence in a virtual environment. A person using virtual reality equipment is able to look around the artificial world, move around in it, and interact with virtual features or items. The effect is commonly created by VR headsets consisting of a head-mounted display with a small screen in front of the eyes, but can also be created through specially designed rooms with multiple large screens. Virtual reality typically incorporates auditory and video feedback, but may also allow other types of sensory and force feedback through haptic technology.
"Virtual" has had the meaning of "being something in essence or effect, though not actually or in fact" since the mid-1400s.[3] The term "virtual" has been used in the computer sense of "not physically existing but made to appear by software" since 1959.[3]
In 1938, French avant-garde playwright Antonin Artaud described the illusory nature of characters and objects in the theatre as "la ralit virtuelle" in a collection of essays, Le Thtre et son double. The English translation of this book, published in 1958 as The Theater and its Double,[4] is the earliest published use of the term "virtual reality". The term "artificial reality", coined by Myron Krueger, has been in use since the 1970s. The term "virtual reality" was first used in a science fiction context in The Judas Mandala, a 1982 novel by Damien Broderick.
Widespread adoption of the term "virtual reality" in the popular media is attributed to Jaron Lanier, who in the late 1980s designed some of the first business-grade virtual reality hardware under his firm VPL Research, and the 1992 film Lawnmower Man, which features use of virtual reality systems.[5]
One method by which virtual reality can be realized is simulation-based virtual reality. Driving simulators, for example, give the driver on board the impression of actually driving a vehicle by predicting vehicular motion caused by driver input and feeding back corresponding visual, motion and audio cues to the driver.
With avatar image-based virtual reality, people can join the virtual environment in the form of real video as well as an avatar. One can participate in the 3D distributed virtual environment in the form of either a conventional avatar or a real video. Users can select their own type of participation based on the system capability.
In projector-based virtual reality, modeling of the real environment plays a vital role in various virtual reality applications, including robot navigation, construction modeling, and airplane simulation. Image-based virtual reality systems have been gaining popularity in computer graphics and computer vision communities. In generating realistic models, it is essential to accurately register acquired 3D data; usually, a camera is used for modeling small objects at a short distance.
Desktop-based virtual reality involves displaying a 3D virtual world on a regular desktop display without use of any specialized VR positional tracking equipment. Many modern first-person video games can be used as an example, using various triggers, responsive characters, and other such interactive devices to make the user feel as though they are in a virtual world. A common criticism of this form of immersion is that there is no sense of peripheral vision, limiting the user's ability to know what is happening around them.
A head-mounted display (HMD) more fully immerses the user in a virtual world. A virtual reality headset typically includes two small high resolution OLED or LCD monitors which provide separate images for each eye for stereoscopic graphics rendering a 3D virtual world, a binaural audio system, positional and rotational real-time head tracking for six degrees of movement. Options include motion controls with haptic feedback for physically interacting within the virtual world in an intuitive way with little to no abstraction and an omnidirectional treadmill for more freedom of physical movement allowing the user to perform locomotive motion in any direction.
Augmented reality (AR) is a type of virtual reality technology that blends what the user sees in their real surroundings with digital content generated by computer software. The additional software-generated images with the virtual scene typically enhance how the real surroundings look in some way. AR systems layer virtual information over a camera live feed into a headset or smartglasses or through a mobile device giving the user the ability to view three-dimensional images.
The development of perspective in Renaissance European art and the stereoscope invented by Sir Charles Wheatstone were both precursors to virtual reality.[7][8][9] The first references to the more modern-day concept of virtual reality came from science fiction.
Morton Heilig wrote in the 1950s of an "Experience Theatre" that could encompass all the senses in an effective manner, thus drawing the viewer into the onscreen activity. He built a prototype of his vision dubbed the Sensorama in 1962, along with five short films to be displayed in it while engaging multiple senses (sight, sound, smell, and touch). Predating digital computing, the Sensorama was a mechanical device. Heilig also developed what he referred to as the "Telesphere Mask" (patented in 1960). The patent application described the device as "a telescopic television apparatus for individual use... The spectator is given a complete sensation of reality, i.e. moving three dimensional images which may be in colour, with 100% peripheral vision, binaural sound, scents and air breezes."[10]
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