COMS W4172: 3D UIs and AR—Spring 2019Prof. Steven FeinerDate out: February 9, 2019Date due: February 26, 2019Assignment 1: Kaiten-Zushi 3DIntroductionThis assignment will be the first Unity project you develop on your own, after having completedAssignment 0 and Assignment 0.5. You will be using Unity 2018.3 and C# to design a 3D scenecontaining objects with which the user can interact using your mobile device’s touchscreen.Your scene will be a kaiten-zushi (conveyor belt sushi) fast-food restaurant. Unlike restaurantsof this type that use a single conveyor belt whose technology is essentially a scaled-downversion of airline baggage-claim conveyor belts, your restaurant will use four straight conveyorbelts, as described below. (Yes, this is a poor design, but it will help turn your program into anentertaining game.) In addition, there will be a chef, plates of food, tables, and trays.Since we do not want you to have to create your own 3D models, you can download models(free ones only, please) for all objects in your scene from the Unity Asset Store, or any othersource (e.g., the ones listed on our IA page), providing you have permission and cite eachsource properly in your documentation. Alternatively, you can load a model (.fbx file, .obj file, orother supported formats) obtained elsewhere by dragging its file into the Project View in theUnity Editor Window. Any associated textures should be added to a “Textures” folder placednext to the loaded model in the Project View. You can also import an entire directory at once.While you are also welcome to create any of your objects directly from Unity primitives, youshould use at least one downloaded model. Again, any model that you use must be free.Conveyor Belts, Trays, Chef, and TablesThere should be four conveyor belts arranged in a rectangle, as shown in Figure 1. All four beltsare identically sized cuboids whose top surfaces are parallel to the world xz-plane. Theconveyor belts do not need to be textured and do not need to move. That is, they do not have toactually behave like real moving belts: Only the plates of food will need to move! The conveyorbelts are not connected to each other. Instead, there are four stationary trays at the corners ofthe rectangle bordered by the belts. The trays should be the same height as the belts.Within the space surrounded by the belts there should be a chef. Outside the conveyor belts,there should be at least four tables. On the conveyor belts there will be sushi plates, specialplates, and dessert plates that move along the paths defined by the belts.1Figure 1. The relative positions of the four conveyor belts, chef, tables, trays, and sushi/special/dessert plates, asseen from above. Each red arrow indicates the direction in which plates on a conveyor belt move.Sushi Plates and Special PlatesThe restaurant serves sushi plates and special (non-sushi) plates. Thus, special plates cancontain whatever food you’d like, which will make finding a free model easier. Each plate shouldmove in the direction and speed associated with its belt after being placed on it, as describedbelow, and should be in contact with its belt (i.e., not floating) as long as it remains on it.Sauce PlatesWe’re not done with the special plates. This restaurant is famous for the automated plates ituses for its special plates, as shown in Figure 2. Each special plate has two sauce plateshovering over it. Each sauce plate should orbit in a circle about a vertical axis through the centerof its special plate at a radius, height, and speed of your choosing. Each sauce plate shouldhave a different orbital radius and should not collide with the other one. By default, each sauceplace should maintain the same orientation relative to its special plate while the sauce plateorbits the special plate. (See Transform.RotateAround and Transform.Rotate for moreinformation.) Each sauce plate can have any shape as long as its orientation is clearly visible.(This will help you and us verify visually that your sauce plates are moving correctly.)2Figure 2. A schematic illustration of how sauce plates move relative to a special plate.Dessert PlatesThe restaurant also serves ice cream for dessert, using a (famous, of course) automated plateshown in Figure 3. Each dessert plate has one ice cream scoop. The ice cream scoop orbits ina circle above the plate around a point whose height is up to you and at a speed of yourchoosing. The ice cream scoop begins its orbit within the plate’s local yz-plane (around an axisparallel to the plate’s local x-axis). As the scoop orbits in its plane, the orbital plane shouldrotate on an axis that passes through the orbit’s center and is parallel to the plate’s local z-axisat a speed of your choosing. The scoop itself should rotate on an axis that passes through thecenter of the scoop and is parallel to the plate’s local y-axis. You will need to ensure that thesingle rotation described in the previous sentence is the only change in the orientation of thescoop relative to the orientation of the dessert plate. The restaurant is quite proud of the way itsice cream scoops move; so, to show that off, please choose an asymmetric scoop shape. Forexample, if the scoop is shaped like a chair (“chairy” ice cream?), its legs should always pointdown, parallel to the dessert plate’s local y-axis.3Figure 3. A schematic illustration of how the ice cream scoop orbits above the dessert plate. The orange axis isparallel to the plate’s local z-axis. The scoop, shown here as a ball, should have an asymmetric shape that clearlyshows its orientation in your program.LightsThere should be at least two light sources in the scene: One is a stationary directional light thatilluminates the whole restaurant and the other is a spot light the chef wears to inspect a plate.The spot light is worn on the chef’s head and looks toward a specific plate, as described below.You can make the spot light change direction rather than the chef. You do not need to make anyscene geometry that corresponds to either light.SelectionThe user should be able to select the conveyor belts, sushi plates, special plates, sauce plates,and dessert plates, using the mobile device touchscreen. (Direct selection using thetouchscreen can be achieved using the Ray object. See the Physics.Raycast andPhysics.RaycastAll functions and the ray casting tutorial.) The ice cream scoops, trays, andtables do not need to be selectable.Once an object has been selected, you should change it visually in some way to indicate this. (Ifyou’d like, you can also indicate selection through audio or vibration, in addition to visually.) Forexample, the object’s texture could change to a texture that marks it as selected. Please thinkabout which approach(es) would be most effective.Initially, no object should be selected. At most one object should be in the selected state at atime. Touching a different selectable object than the currently selected object should deselectthe currently selected object and select the newly touched object. (Note that touching4non-selectable items should not deselect the currently selected object.) You should also providesome way to deselect the currently selected object without selecting another object.Control PanelsUsing the Unity UI System, create a partially transparent control panel (see the Canvasdocumentation and the Canvas Manual) for each selectable object. These panels should beplaced in a position of your own choosing. Each panel should be visible only while the object towhich it belongs is selected. Thus, none of the object control panels should be visible when yourapplication is initialized. The panels will contain controls (made with Interaction Componentsand Visual Components) for the parameters of the actions you assign to your objects (see nextsection for details).There should also be a camera control panel to control the camera mode (see the discussion ofthe Camera below). The camera control panel should be initially visible and your user should beable to hide and unhide it.Object ActionsConveyor BeltsThe conveyor belts act like a single object in terms of selection. When the user touches aconveyor belt, all four conveyor belts should be selected at the same time and the sushi,special, and dessert plates on them should stop moving relative to the belts. (However, sauceplates and ice cream scoops should continue to move relative to their plates.) The panel for theconveyor belts should appear, allowing the user to change the speed of the conveyor belts. Allfour conveyor belts should share the same speed (i.e., all plates on them should move at thesame speed).Sushi Plates, Special Plates, and Dessert PlatesWhen a special plate or a dessert plate is selected, its sauce plates or ice cream scoop shouldstop moving, pausing at their current poses until the plate has been deselected.The user can drag a sushi plate, special plate, or dessert plate that is on a belt or tray, toanother belt, tray, or table. Dragging a plate also causes it to be selected. Dragging a plate to atable will serve the (invisible) customers at that table. If the user drags a plate, the plate shouldfollow the user’s finger as long as the finger stays in contact with the screen. The plate shouldstop moving when the user removes their finger from the screen.When the user starts dragging the plate, a partially transparent, stationary sphere should bedisplayed, centered about the original position of the plate. The sphere indicates to the user thevolume in which the plate is allowed to move and the plate should be prevented from movingoutside the sphere. If after the user lifts their finger, the last position of the plate is directly on atable, belt, or tray, the plate should remain there. Otherwise, it should be destroyed, asdescribed below, because the user dropped it or caused it to collide with another plate and it5broke. (To detect collision, please refer to the Unity documentation for Collider, including itsmessages such as Collider.OnTriggerEnter, and the Colliders as Triggers video tutorial.)Recall that in Figure 1 the conveyor belts are not connected. Consequently, a plate that reachesthe end of its belt should stop on the tray at that end. The user must manually drag that plate tothe next conveyor belt before another plate arrives at that tray. If a second plate arrives at thetray before the first plate is moved off it, then both plates should be destroyed!At most four plates (sushi, special, or dessert) can be on a table at the same time. If the usertries to drag a fifth plate onto that table, that plate should be destroyed (since the table is fulland it is impolite to put the plate back on the belt). Each plate should remain on a table for nomore than some specified amount of time (set by you), after which it should silently disappear,to indicate that it has been finished. This will allow new plates to be served. Use Time.deltaTimeto implement a timer. You are welcome to display a countdown for each table.If a plate travels all around the four belts back to the chef, it is considered stale and should alsobe destroyed.If a plate is destroyed by being dropped, crashing into another plate, or staying on the belts toolong (but not by being finished at a table), some visual and audio effects should be used beyondsimply having the plate disappear. You should have some way to display the running totals ofplates that were destroyed and plates that were finished since your application was invoked.ChefThe chef should make new sushi, special, and dessert plates automatically at a rate set by theuser, one plate at a time. When a new plate is made, it should spawn on the belt next to thechef. But please make sure the chef doesn’t put a new plate on an existing one! Use Prefabs forthe sushi, special, and dessert plates.The chef’s spot light should initially shine on the belt in front of them, where each plate isspawned. However, the chef is very proud of their creations. So, the first time the chef creates aplate, the chef’s spot light should shine on that plate, no matter where it is, until the platedisappears (has been eaten or destroyed). In general, the spot light should shine on the chef’soldest plate. If at any time there is no plate, the spot light should shine on the belt in front of thechef. See Transform.LookAt to learn how to direct the spot light.When the chef is selected, the user should be able to set the rate at which plates are spawned.However you do this, by default the chef should alternate between creating sushi, special, anddessert plates.Sauce PlatesWhen a sauc代做COMS W4172作业、代做3D UIs留学生作业、代写Java/Python编程作业、代写c/c++，Pythoe plate is selected, it and the other sauce plate hovering over the same specialplate should stop moving relative to the special plate, pausing at its current pose relative to thespecial plate until it has been deselected. Note that when a special plate itself is selected (and6its hovering sauce plates have paused), the sauce plates should still remain selectable, and ifone of the sauce plates is selected, its special plate should be deselected and start movingagain if it is on a belt.The control panel for a sauce plate should allow the user to adjust the speed at which it orbits itsspecial plate. By default, a sauce plate maintains the same orientation as its special plate. Thecontrol panel should also allow the user to set a speed and direction at which the sauce platerotates on an axis passing through the center of the sauce plate and which is parallel to thelocal y-axis of the special plate.Whenever an object resumes moving after it has been paused, it (and any descendants)should resume from its current position and orientation. That is, it should not make adiscontinuous jump in position or orientation.Difficulty LevelsThere are two game difficulty levels, which the user should be able to switch between: easy andhard. In easy (the default), plates should be moved to the next conveyor belt automatically whenthey arrive at the tray at the end of their belt, but the user still needs to drag plates onto tables.In hard, the user needs to drag plates from one conveyor belt or tray to the next belt.CameraYour user should be able to use the camera control panel to switch the camera between thefollowing two modes:Restaurant mode (the default): The camera should overlook the whole scene, and should belocated and oriented such that everything in the scene is within its frustum. No explicittranslation or rotation of the camera by the user is possible in this mode.Player mode: In this mode, the user should be able to move and rotate the camera, so they caninspect any desired part of the scene. You should allow the user to dynamically determinecamera yaw and pitch and the speed with which the camera translates in the direction in whichit is looking. The user should be able to change yaw and pitch when the camera position isfixed.Note that objects that are outside the bounds established by the camera’s near and far clippingplanes will not be visible; so, please bear this in mind when setting the clipping planes.Ten Usability Heuristics for User Interface DesignYour user interface should follow the Nielsen usability heuristics. We will not grade your workbased on the aesthetics of its models (since we do not want you to buy any assets and do notassume you have any modeling skills) or on physical realism. However, your UI should still beeasy to use and user-friendly.7(Optional) Mult-TouchThe user might want to use multiple fingers on one or both hands. To make this possible, youare optionally welcome to support multi-touch interaction. See Multi Touch Input for moreinformation.(Optional) Test Your Project on an Acer Windows Mixed Reality HeadsetIf you finish the assignment early, you are welcome to try to deploy your project on an AcerWindows Mixed Reality headset (for Windows only). Before doing this, please come to TA officehours, so we can first check the completeness of your project. If everything looks ok, we will letyou sign out a headset, for which you will need to install SteamVR and the Windows MixedReality for SteamVR patch. Here is a high-level description of how you will then need to modifyyour project (we’ll provide more details later):CameraTo enable the user to move and explore the environment in the scene, you will need to makethe camera move with the headset. To do so, you will need to add a SteamVR CameraRig tothe scene and make sure the Virtual Reality Supported option is enabled in Edit→ProjectSettings→Player→XR Settings.ControllersWhen wearing the headset, the user will no longer have a touchscreen to use for selection.Instead, they will use the two accompanying 6DoF controllers.We will ask that you make a separate scene for use with the headset as part of yoursubmission.HintsBefore starting this assignment, please note that there is an extensive collection of UnityTutorials. We strongly suggest that you review the Roll-a-Ball tutorial. Additionally, please lookthrough the Unity Manual, to get a better feel for the Editor. Please see the Unity reference pageon Input for a comprehensive overview of its functionality.To do this assignment well, you should think carefully about how you structure your scene graphhierarchy. Which nodes should you use and how should they be arranged in the hierarchyrelative to each other? (The relationship between a parent and its children is important, whilethe order in which siblings are listed should not matter for this assignment.) How should thetransformations that you apply to your objects be composed to achieve the required effects?Begin with just one conveyor belt, one table, and the sushi plates to experimentally verify thatyour approach works, so you can modify it early on if necessary. Then add the rest of the belts(running at first in easy mode), selection, dragging, special plates and dessert plates (withsimplified orbits and rotations of sauce plates and ice cream scoops at first).8Regarding hierarchy: Understanding rotation is crucial here. Note that when an object is rotated,its descendants will also rotate. Therefore, if you want object B to act as if it were a descendantof object A, but not be affected by A’s rotation (e.g., to have A rotate at a different rate than B),the easiest way to do this is to create empty GameObject A′, make A and B both children of A′,where A is centered at A′ and B is offset from A′, and then rotate A and B individually. If you dothis, transforming A′ will transform all its descendants, but A and B can each have its ownindependent rotation.Regarding model files: Each model file you find will, when you find it, most likely not be of anappropriate scale relative to the other objects you’re using. Therefore, be prepared to apply ascale transform to one or more of your models to bring them up or down to a reasonable size. Inaddition, note that some models may contain too many polygons for your mobile device torender your scene at a reasonable frame rate. Before you get too enamored of any model,please try it out on your device in context with the rest of your scene to make sure that it willwork well. See also How do I fix the rotation of an imported model?Regarding ray casting: When using the Physics.Raycast function, you will be returned aRaycastHit object. The RaycastHit object contains a reference to a Collider. The Collidercontains a reference to the GameObject to which it is attached. You can use that reference todetermine the object with which a ray cast through the screen collided.Regarding rotation and orbiting: In Unity, the Transform.Rotate method specifies a relativeorientation change that will be composed with the current orientation. Transform.Rotate needsto be given the amounts to rotate as Euler angles about x-, y-, and z-axes, either as threeseparate floats or as a Vector3. It will apply a rotation to the object about the z-axis, x-axis, andy-axis (in that specific order, as discussed in class). You should also read about and useTransform.RotateAround. Please be sure that you understand the relativeTo parameter ofTransform.Rotate and how Transform.{right,up,down} differ from Vector3.{right,up,down}. Instrong contrast to the Transform.Rotate method, theTransform.{rotation,localRotation,eulerAngles,localEulerAngles} properties set the absoluteorientation of a Transform (i.e., will override and ignore its current orientation) and do this inways that offer many possibilities for you to do the wrong thing: none of the elements ofTransform.{rotation,localRotation} is an angle (they are the components of a quaternion) andnone of the angles of Transform.{eulerAngles,localEulerAngles} should be set individually orincremented!Regarding Play Mode: While Play Mode is a very useful way of debugging your app, it is notfully indicative of how it will run on your mobile device. Make sure you test fully on your devicewhenever you introduce a new imported asset. While debugging, you will want to includesecondary controls that are guaranteed to work on desktop (or laptop) in Play Mode, such asInput.getMouseButton(). Since these controls may affect performance slightly, you will want todisable them when running on your mobile device. (Or if you feel comfortable with your app’sperformance on your device, you can choose to support both modes.)9Regarding textures: When you load in a model and associated texture in two separate loadsteps, the texture might not connect to the model automatically. In order to connect the textureto the model, drag the texture onto the Texture box in the Material component of your model inthe Inspector View.Regarding transparency: It might be tempting to make some objects semitransparent. Butplease note that objects that have any portions that are not opaque are treated quite differentlyfrom opaque objects in how and when they are rendered, because of the hardware renderingalgorithm used in current interactive graphics systems. This should not be a problem if you haveonly a single planar object that is not opaque. However, this can cause multiple nonopaqueobjects to render incorrectly and inconsistently as their positions change relative to each otherand the camera. Since you will be using a transparent sphere to show the bounds within whicha plate can move, we strongly suggest that you do not make any other objects transparent.What to submitYour submission should include:● The entire Unity project folder compressed.○ Do not include the app executable (or the XCode project for iOS).● A README.txt file with:○ Your name & UNI○ Date of submission○ Computer Platform○ Mobile Platform & OS version & Device name○ Project title○ Project directory overview○ Special instructions, if any, for deploying app○ Instructions for using app○ Missing features○ Explanation of bugs in your code and Unity○ Asset sources (cite everything you didn’t create yourself)● A brief video demonstrating your application’s features. Please practice before recordingit and do some simple editing to remove unnecessary pauses. Submit this as a link inyour README file and in the CourseWorks File Upload comment to an unlisted videoon YouTube or Google Drive. The upload time of your video will be the time at which wewill consider it to have been submitted.10How to submitPlease compress all files in your submission into a single zip file, remembering to include anyneeded data files. Please follow the naming convention “YOURUNI_Assignment1.zip” for yoursubmission. Name your video “YOURUNI_Assignment1,” upload it as an unlisted video onYouTube and include the URL in your submission, as described below. Submission should bedone through CourseWorks, following these steps:1. Log into CourseWorks.2. Select Assignments from the left-hand navigation pane.3. Click the Submit Assignment button in the top right corner.4. The Submit Assignments page will load. Choose your zipped project using the browsedialog window that appears after pressing “Choose File.”5. After choosing your project, copy the URL of your unlisted video upload into theComments field beneath the File Upload section.6. Press “Submit.”Please try to submit well before the deadline, since CourseWorks can sometimes become busyand slow. You can resubmit multiple times. (Note: CourseWorks will save your previouscomments, so you don’t need to re-enter your URL if it has not changed, but CourseWorks willclear your previous upload from the File Upload section.) You can add a file you previouslyuploaded by clicking “Click here to find a file youve already uploaded,” expanding the Unfiledfolder and selecting your file, then pressing “Submit.”Immediately after uploading your submission, please check it by downloading it, creatinga new project with which to test it, and reading through its README.txt file. We will notaccept an excuse that you accidentally uploaded the wrong file.Remember, you can use only a single late day on this assignment, so start early! And, have fun!GradingObject motion 25 pointsSelection 20 pointsPlate dragging 15 pointsUser interface (Usability heuristics) 25 pointsCameras and lights 10 pointsDocumentation (including video) 5 pointsTotal 100 points转自：http://ass.3daixie.com/2019021340727327.html
