CS4730-UX · • EasePofPuse#vs.#EasePofPlearning# • EasePofPuse# –...
Transcript of CS4730-UX · • EasePofPuse#vs.#EasePofPlearning# • EasePofPuse# –...
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CS 4730
HCI + UI = UX
CS 4730 – Computer Game Design
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How do we interact with the game? • Broken into two parts
– 1. a device that can sense a player’s physical moCon (we’re assuming we’re not using mental devices just yet…)
– 2. how the game interprets the movement into the virtual world
• Part 2 is related to mechanics/dynamics • Part 1 can be decoupled from games a bit and discussed independently
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Categories of Devices • Touch-‐based • InerCal-‐based • Sound-‐based • Camera-‐based • “Advanced sensing” • Each of these has subcategories as well
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Touch-‐Based • This category involves all devices that require physical contact to sense user input
• By far the largest/most common category • Most are all electric circuit based, wherein a player completes a circuit by a moCon, thus triggering a signal to the system
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Touch-‐Based • Binary Circuits
– BuYon unpressed = low voltage – BuYon pressed = high voltage
• Angular Sensors (potenCometer) – Analog joysCcks vary the voltage with posiCon
• ElectromagneCc Field – Surface with baseline electromagneCc state is disrupted by a finger touch
– ResisCve completes a circuit beneath
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Controller Examples • Keyboard • Mouse • Console Controller • Specialized Console Controller
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WASD and the Mouse • The keyboard has been around for a LONG Cme (relaCvely speaking) – Devised in the early 1900s – With compuCng devices in the 60’s
• The mouse… not as long, but sCll for a while – 1984 – Xerox PARC and Apple and Microsoj
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WASD and the Mouse • What sort of games make sense for this control structure?
• Why? • How does that affect the game play?
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EvoluCon of the Console Controller
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InerCal-‐Based • Accelerometer
– Senses the direcCon of acceleraCon and gravitaConal force on a single axis
• Magnetometer – EffecCvely a compass sensing the Earth’s magneCc field
• Gyroscope – Senses angular velocity and change in force on a spinning mass
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Accelerometers and the Wiimote • Wiimote uses a 3-‐axis combo accelerometer • Wii MoCon Plus adds a gyroscope
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Accelerometers and the iPhone • How is this a different dynamic?
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GPS as Input Device • Seek ‘n Spell
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Handling Noisy Input • Uncertain input can make games frustraCng • Player intenCon has to match game interpretaCon
• This breaks down into a state es&ma&on problem
• By increasing or decreasing sampling rate, we can have a beYer predicCon as to what state the device is in
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Light Guns • Flashing on the screen is interpreted by the device
• A ray can be traced from the gun aperture to the screen to determine the angle of aYack
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Sound-‐Based • Speech Commands • Calculate the Euclidian distance from a normalized sound clip to training clips stored in a database
• AddiConal training models can be layered on top of this
• Or you could ignore all of that and just go for pitch (i.e. Rock Band)
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Camera-‐Based • Blobfinding – latching on to specific colored things in the environment
• Background subtracCon – over n frames, what hasn’t changed? That’s the background
• And… let’s just look at the Kinect and Child of Eden
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Input Schemes • Step 1: Which controller • Step 2: What buYons do what? • Step 3: ???? • Step 4: Profit!
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Input Schemes • How do you know what buYon does what?
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Input Schemes • The bane of several genres
– Sports – FPSs
• The bane of touch screen games – Virtual sCcks – Touch-‐to-‐move
• The bane of keyboard games – … that’s a lot of buYons…
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“Accepted” Input Schemes • How are these communicated to users? • How do we get over the problem of “training” new gamers?
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Okay… so that’s control • Now how do we relay info back to the user on screen
• The User Interface is essenCal to the feedback construct of games
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Let’s Take This Out of Video • How do you consider user interface for non-‐digital games?
• What provides feedback? • How is it enforced?
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How “Easy” is “Easy”? • Ease-‐of-‐use vs. Ease-‐of-‐learning • Ease-‐of-‐use
– If you already know what you want to do, how quick / easy is it to pull it off?
• Ease-‐of-‐learning – If you are new to a game, how easy is it to figure out what you are allowed to do and how to do it?
• Usually, there is a linear trade off between these two concepts
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How “Easy” is “Easy”? • Consider any WASD game
– Tons of hot keys – … tons of keys period
• Very quick to do many different acCons • How do you know which buYon to press?
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How “Easy” is “Easy”? • Consider a complex board game
– Usually, there are tons of charts, symbols, icons, etc.
– Very easy for an experienced player to know exactly what’s going on
– InCmidaCng to novice players
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How “Easy” is “Easy”? • SomeCmes you can do both • The concept here is called recogni&on over recall
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How “Easy” is “Easy”? • SomeCmes you can do both • The concept here is called recogni&on over recall
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Super Models • The User Model
– How the user “thinks” the system will behave
• The Program Model – How the game ACTUALLY will behave
• Program Model is always “right” with video games – This isn’t always true with board games!
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Super Models • You want these models to match as much as possible – Even if there is some “behind the scenes” shenanigans going on to make it look right
• Which is easier to change? • How do you know if you need to change something?
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Super Models • Play tesCng! • This is actually much more robust than in other sojware development
• You watch people play – See what buYons they press – When they press – How they press – How they interact – Watch lots of people!
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If the Models are Wrong • FrustraCon, embarrassment, anger are all reacCons to an incorrect user model
• Probably not a central aestheCc to your game – (maybe…)
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Focus on the InteracCons! • What is the opera&onal profile of your game? • Find the most common acCviCes and make them the easiest to do
• Find the most common icons/symbols and put them up-‐front and center
• Don’t rely on tradiConal colors/symbols for everything – Consider the mailbox icon…
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Tips and Tricks • Eliminate all uninteresCng tasks – everything should have a purpose
• Use visual metaphors – make it obvious for what something represents
• Be consistent with similar/established games • Keep HUDs appropriate to the asetheCcs
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How important is UI design? • If you screw up your UI for a text editor
– The user might get a liYle frustrated – Might read the manual – Might realize they are using EMACS and quit
• If you screw up your UI for a game – The user gets very frustrated – The user may get angry – The user will never buy your game again – The user will leave lots of nasty comments
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What are you trying to convey? • What are you trying to get across to the user with your UI design?
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What are you trying to convey? • The state of the world • The rules • The available acCons/interacCons • How do you do this? • How do you show the state while keeping gamers immersed?
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Providing Info
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Providing Info
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CS 4730
Providing Info
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CS 4730
Examples
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CS 4730
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CS 4730
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CS 4730
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CS 4730
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CS 4730
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CS 4730
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