Revision as of 16:31, 12 June 2019

Homework Assignment 4: Dual User VR

For this project you need to implement a dual user 3D VR application for two Oculus Rifts with Touch controllers.

You can obtain 100 points, plus up to 10 points for extra credit.

This homework assignment is due on Tuesday, June 11th at 3:00pm.

The project is designed to be a team project for two people. You can team up with the same person as for project 1, or someone else.

For inspiration, we recommend watching some of the videos from last year's CSE190 course here, as well as the Oculus Toy Box application.

Update: Here is this year's video playlist.

Grading

Your final project score consists of three parts:

• Documentation (10 points)
• VR Application (70 points)
• VR Experience (20 points)
• Extra Credit (10 points)

Documentation (10 Points)

You need to create a web site or blog to report on the progress you're making on your project. You need to make at least two entries to get the full score.

The first report entry needs to contain (at a minimum) the following pieces of information:

• The name of your project (you need to come up with one)
• The names of your team members
• A short description of your project
• One or more screen shots of your application in its current state

In week 2 you need to write about the progress you made and update on any changes you made to team or team name. You also need to post another screen shot.

You are free to create the report on any type of web site or blog. We recommend Google Sites. You are free to create more entries than the two required ones.

Each team also needs to make a 2-3 minutes long Youtube video of their application, to show during the first hour of the grading event during finals week. We are going to create a Youtube playlist to which we are going to ask you to add your video. For a full video score you need to show both users' screens side-by-side, along with a video showing the real world activity. These don't have to always be shown at once but at least in one part of the video.

The points are distributed like this:

• Report entry #1: 3 points. Due Monday, June 3th at 11:59pm
• Report entry #2: 3 points. Due Monday, June 10th at 11:59pm
• Video: 4 points. Due June 11th at 3pm

VR Application (70 Points)

The following requirements apply to your application. The listed numbers are the percentages for how much the respective line item counts towards your technical score.

Dual User Application (40 Points)

• Your application needs to be a dual (i.e., two) user application running on two Oculus Rifts with Touch controllers, attached to two separate computers. (10 points)
• Each user needs to be able to use at least one of their Touch controllers to help with the interaction. (10 points)
• The users need to work together on something, for example: hand an object to the other user, play a ball game together, play chess, build something with Legos, cook together, etc. This requires network communication between the two computers. (10 points)
• Either head positions or the positions of the interacting hand(s) of each user need to be indicated with at least a simple piece of geometry for both users (e.g., a cube), to represent the user to the other one. The representations of head and/or hands need to be distinguishable from one another. The representation of the head needs to have an indicator for the direction the user is looking in, hands can't be rotationally symmetrical (i.e., can't be represented as spheres). (10 points)

Other Requirements (30 Points)

• Use per-pixel lighting with the Phong or Blinn-Phong shading model. This requires adding at least one light source to your scene, and modifying the shaders. (10 points)
• Collision detection needs to be part of the interaction algorithm. It can be simply done by proximity, or bounding box collisions. (10 points)
• At least one 3D object in your application needs to be custom made by your team. You can use photogrammetry (with Agisoft Photoscan or other tools such as 123D Catch), or a 3D scanner such as the one in the VR lab (at the HTC Vive desk), or a 3D modeling tool such as Blender or Sketchup. Make sure your polygon normals are correct, or else your lighting won't work. Your 3D object can't be a primitive 3D object (such as sphere, cube, cuboid, torus, pyramid, planes, etc). (5 points)
• You need to use audio in your application, e.g., for background music, sound effects, etc. It doesn't have to be spatialized, unless you want to compete for the extra credit for audio. (5 points)

Grading

• -10 points if your application does not run at 90 fps (frames per second)
• -10 points if your application does not support 6 degree of freedom head tracking

The final project has to be presented to the course staff during our final exam slot on Tuesday, June 11th. The presentations start off with a video screening session at 3pm in room 1242. Then we will do science fair-style demos in VR lab B210 in two grading windows: one from 4-5pm, the other from 5-6pm. You are allowed to bring friends to both video screening and demos.

VR Experience (20 Points)

This score is for the user experience of your VR application. It is a subjective score factoring in your project idea, aesthetics, usability, wow factor, etc. The score will be determined by the graders, which are instructor, TA and tutors. You need to be prepared to let the graders try out your application during the demo window.

Extra Credit (10 Points max.)

We are going to give extra credit in the categories below. There will be 5 points of extra credit for each category a project wins, for a maximum of 10 extra credit points total. These awards will be given after grading and will be listed in a Piazza post.

The categories are:

• Best app to make use of dual users (i.e., requires two users, not very well usable with single user)
• Most intuitive controls (in-app training can help)
• Best user interaction concept
• Best aesthetics
• Most technically challenging app
• Best use of audio
• Most polished app
• Most entertaining app
• Best video (the one you make for the video screening): nicely edited video that shows live footage of both users using the application, along with what they see in the Rift, and it needs to include audio

Tips

You are allowed to use any software libraries which you used in homework assignments 1 through 3. In addition, you are allowed to use the following libraries:

• SOIL to load texture images, or any other library listed here
• The Oculus Avatar SDK
• Assimp for importing OBJs
• Very simple, single header file solution to load images.
• Tiny OBJ Loader to load OBJ files.
• OpenAL for audio support
• XML parsers, such as MiniXML or PugiXML - useful for configuration files
• Physics engines PhysX or Bullet.

You are allowed to use any source for 3D models and textures, including:

• Google 3D Warehouse
• Turbosquid
• CGTrader

To create your own models, here a few tips:

• The 3D scanner at the Vive computer in the VR lab is a scanner from Matter and Form. It scans objects up to a size of 9.8 inches high, 7.0 inches in diameter, and a weight of 6lbs. The scanning software is installed on the computer. We recommend to export the scans to the OBJ file format to process with MeshLab or load into your application directly.
• Agisoft Photoscan offers free 30 day trial licenses. You do have to register your email address to get one, but they are legit.
• An open source alternative to Photoscan is WebODM. UCSD has a research compute cluster that you can use to process your images into a 3D model. The images need to be taken of a static scene (no lighting or shadow changes while you take the images), best to put the object outside in a shaded area. Take 30-100 images from all sides. Log in to the WebODM front end with the account credentials given on Piazza. Create a project, click Select Images and upload your images. The default settings should get you a reasonable 3D reconstruction that you can download in its textured format for the best quality.

If your 3D models are too big to render at 90 fps, try using MeshLab to reduce the polygon count of your models.

Network Communication

To communicate between the two Rift PCs, you will need to implement network communication. You can keep this very simple. You are allowed to use any network communication library, including cloud services, data bases, or anything related.

We recommend using this remote procedure call (RPC) library. Here is a minimal example (updated on 05/30) of a client-server project using rpclib (It only compiles in x64 - release mode).

If you want to use a different approach, you could do direct socket communication with a library such as this one, the code can be downloaded here. You can choose to create a server program which both applications connect to, or have each application connect directly to the other. In the latter case you should run your network communication in a separate thread so that the rendering loop cannot get interrupted, which would likely lead to the frame rate dropping below 90 fps.