POSTECH VR

Introduction to 3D Interaction

포항공과대학교 컴퓨터 공학과

가상현실감 연구실

2POSTECH VR Introduction

POSTECH VR Laboratory

• Members– Prof. Chan Mo Park and Asst. Prof. Gerard Jounghyun Kim– Research Staff(3), Ph.D. Student(3), Master’s Student(10)

• Research– 3D interaction

• interactive music system• multimodal interaction for CAD• VR based motion training

– software engineering of virtual worlds– human body modeling

• http://www.postech.ac.kr/cse/vr

3POSTECH VR Introduction

발표 순서

• Introduction(90 min.)– 3D interaction tasks(definition)– issues on 3D interaction design– taxonomy of 3D interaction

• Task oriented interaction design at POSTECH(50 min.)– interaction techniques for immersive CAD : menu selection– interactive music system : manipulation/view– VR based motion training(Ghost Metaphor) : following/view

• Evaluation for 3D interaction tasks(30 min.) – usability engineering method – evaluation techniques

• Conclusion and Discussion(10 min.)

4POSTECH VR Introduction

Why 3D Interaction?

• 3D/VE application – immersion(presence)– naturalness(cognitive load)– fast/efficient

• Application up-to-date– example

• architectural walkthrough, visualization, training etc.– complex interaction– usability– problem

• introduce 2D interaction technique : DOF problem• advanced technology : not ensure that VE’s are usable

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Definitions

• Interface technology– specialized choice of the hardware/software through which a

user communicates with a computer system

• Interaction model– a model by which the user accomplishes some tasks via the

interface

H/WS/W

HMD, Tracker, Glove...

Performer,Inventor,WTK, ...

Syste

m

Tasksselect, observe,manipulate, ...

Interaction Model

data format, stage, view,hierarchy, structure, ...

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Interaction Tasks

• Navigation– movement(travel, walk) and planning(way-finding)

• Selection– choosing one or more objects

• Manipulation– specification of object position, orientation, scale, shape,

others

• Selection Manipulation ?– selection may be a stand-alone task – ex) menu selection(command)

• Others : almost atomic(chunked) tasks– visual information browsing– measurement– data input– following, flow control

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Goals of Interaction Design

• Performance– efficiency, accuracy and productivity– quantitative measures : how well is task being done?

• Usability– easy to use and learn– qualitative experience : how easy is it to communicate with?

• Applicability– take not hindered by the interface– qualitative measures : how well applicable is it to other

applications?

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Directions of Research

• Generic interaction technique– do not consider particular applications – infer from real 3D interaction methods/develop new

techniques

• Application dependent interaction technique– suitable interaction methods for a given application– start from GIT and consider new techniques

• Conflict– from GIT to ADIT and from ADIT to ADIT– need methodology for developing/verifying GIT/ADIT in a

scientific way

• Goal– guideline for 3D interaction design– GIT : initial guideline for 3D interaction design– ADIT : case by case UI study design of process