Ohan Oda, PhD Candidate
Department of Computer Science
Computer Graphics and User Interfaces Lab
Columbia University
Office: 212.939.7101
Email: ohan@cs.columbia.edu

Fall 2006 - current, CGUI Lab, Columbia University

Developing Goblin XNA, a platform for building 3D augmented reality games and user interfaces, based on Microsoft XNA. Goblin XNA is being used for research and teaching

Some projects done using Goblin XNA

	Augmented Reality Collaborative Sonic Environment: This is a 3D audiovisual augmented reality environment in which players can position and edit virtual bars that play sounds when struck by virtual balls launched under the influence of physics. Players experience ARmonica through head-tracked head-worn displays and tracked handheld ultramobile personal computers, and interact through tracked Wii remotes and touch-screen taps. The goal is for players to collaborate in the creation and editing of an evolving sonic environment. Research challenges include supporting walk-up usability without sacrificing deeper functionality. A video is available here.
	Augmented Reality Modeling on Microsoft Surface: This is an augmented reality application built with Microsoft Surface to allow the users to directly create and manipulate 3D geometries using their fingers on the surface. The current version only supports creation of simple 3D shapes such as cubes, cylinders, and extruded polygons, and displays the 2D footprints on the surface for observers who are not wearing a head-worn display. A video is available here
	Redirected Motion with Multiplayer Domino Game: In a multi-user augmented reality application for a shared physical environment, it is possible for users to interfere with each other. For example, consider a multi-player game in which each player holds a display whose tracked position and orientation affect the outcome. In this kind of game, one player may physically block another player's view or physically contact another player. We are exploring software techniques intended to avoid such interference. These techniques modify what a user sees or hears, and what interaction capabilities they have, when their display gets too close to another user's display. Redirected Motion is an effective, yet nondistracting interference avoidance technique for hand-held AR. For details, please read the paper here. A video is available here.
	Augmented Reality Marble Game: The player wears a video-see-through head-worn display, and tilts and translates a tracked board to guide a virtual "marble" (actually, more like a little rubber ball) through a dynamic maze of obstacles. Gravity in the game always points in the correct direction, no matter how the player's head and board are oriented relative to each other. This is possible because the game uses both optical marker tracking and a separate head-tracker built into the head-worn display. The optical marker tracker relies on a camera on the head-worn display to determine the board's relative position and orientation. The built-in head tracker determines which way is "down," which the game uses, in turn, to compute the true "down" direction for the board. A video is available here.
	Augmented Reality Dominos: This is an augmented reality domino game. It demonstrates an application that can run on a mobile device with reasonable framerates (~30Hz without shadows, ~15Hz with shadows). The player can add more dominos to the optically tracked game board, as well as modify the position and orientation of each existing domino. The current goal of the game is to knock all the dominos off the board by shooting balls from wherever the screen is tapped.
	Augmented Reality Racing Game: This is an augmented reality mod of the XNA Racing Game Starter Kit. This is the first game being created using Goblin XNA, and demonstrates the use of fiducial tracking, 2.5D and 3D widgets, and assorted 3D user interface techniques. The Goblin XNA AR Racing Game uses an optically tracked physical gameboard, controller, and tokens. Instead of racing around a preset virtual track, the driver must pass a sequence of waypoints, while avoiding obstacles. Waypoints and obstacles are attached to physical tokens that can be moved dynamically during gameplay to rearrange the course. A video is available here.

Fall 2005 - Spring 2006, CGUI Lab, Columbia University

Worked on the implementation of a mobile augmented reality treasure hunt game, as well as a mobile authoring tool for augmented reality.

Ohan Oda, Steven Feiner, "Rolling and Shooting: Two Augmented Reality Games", CHI EA '10, Atlanta Georgia USA, 10 - 15 April, 2010.

Ohan Oda, Steven Feiner, "Interference Avoidance in Multi-User Hand-Held Augmented Reality", ISMAR '09, Florida Orlando USA, pp. 13 - 22, 19 - 22 October, 2009. PDF

Sinem Guven, Ohan Oda, Mark Podlaseck, Harry Stavropoulos, Sai Kolluri Gopal Pingali, "Social Mobile Augmented Reality for Retail", Percom '09, pp. 1 - 3, 9 - 13 March, 2009.

Ohan Oda, Levi Lister, Sean White, Steven Feiner, "Developing an Augmented Reality Racing Game", INTETAIN '08, Cancun, Mexico, 8 - 10 January, 2008. PDF

Ohan Oda, Neesha Subramaniam, "Fast Dynamic Fracture of Brittle Objects in 3D", SIGGRAPH '06, Boston, MA, 29 July - 3 August, 2006

Sinem Guven, Steven Feiner, Ohan Oda, "Mobile Augmented Reality Interaction Techniques for Authoring Situated Media On-Site", IEEE ISMAR '06, Apr, 2006

Ohan Oda, Stephen Chenney, "Fast Dynamic Fracture of Brittle Objects", SIGGRAPH '05, Los Angeles, CA, 31 July - 4 August, 2005

Spring 2008, Columbia University

COMS 4172: 3D User Interface, Professor. Steven Feiner

Spring 2007, Columbia University

COMS 4172: 3D User Interface, Professor. Steven Feiner

Spring 2006, Columbia University

COMS 1007: Object-oriented programming and design in Java Professor. Sholomo Hershkop

Fall 2005, Columbia University

COMS 3827: Fundamentals of Computer Systems Professor. Prabhakar Kudva

Fall 2008, Columbia University

• COMS 4701: Artificial Intelligence, Professor. Alexander Pasik

Fall 2007, Columbia University

• COMS 4444: Programming & Problem Solving, Professor. Kenneth Ross

Spring 2007, Columbia University

• COMS 4118: Operating Systems I, Professor. Henning Schulzrinne
• COMS 4735: Visual Interfaces to Computer, Professor. John Kender

Fall 2006, Columbia University

• COMS 4170: User Interface, Professor. Steven Feiner
• COMS 4231: Analysis of Algorithms, Professor. Mihalis Yannakakis
• KORN 1101: Elementary Korean, TA. Eunyoung Won

Spring 2006, Columbia University

• COMS 4162: Programming Languages and Translators, Professor. Stephen Edwards
• COMS 4995: Video Game Design, Instructor. Bernard Yee
• COMS 4901: Projects in Computer Science, Professor. Stephen Edwards
• COMS 6901: Projects in Computer Science, Professor. Steven Feiner

Fall 2005, Columbia University

• COMS 4115: Programming Languages and Translators, Professor. Stephen Edwards
• COMS 4150: Computer Graphics, Professor. Ravi Ramamoorthi
• COMS 4824: Computer Architecture, Professor. Luca Carloni
• COMS 6901: Projects in Computer Science, Professor. Steven Feiner