ImpAct : Haptic Stylus for Shallow Depth Surface Interaction

彬彬

Copyright is held by the author / owner(s).

SIGGRAPH Asia 2011, Hong Kong, China, December 12 – 15, 2011.

ISBN 978-1-4503-0807-6/11/0012

ImpAct : Haptic Stylus for Shallow Depth Surface Interaction

Anusha Withana , Yuta Sugiura, Charith Fernando, Yuji Uema, Yasutoshi Makino, Maki Sugimoto, Masahiko Inami

Keio University, Japan.



Figure 1: Prototype of ImpAct, Illusion of permeability for shallow depth interaction and Playing billiard with ImpAct

1 Introduction

Push

Rotate

Elongated

Rotated Rendering

Rendering

Physical

Rendered Projection

Figure 2: Simulated Projection Rendering (SPR)

ImpAct is a haptic stylus which can change its length dynamically

and measure its orientation changes in 3 degrees of freedom. Combining

it with a 3D simulated projection rendering mechanism as

shown in Figure 2, it can make the illusion of going through a display

surface in to the digital space below(Figure 1). Furthermore,

once user get into the digital space, more realistic interactions with

digital objects are provided with kinesthetic haptic feedback by applying

force-feedback on the scalable stem.

ImpAct’s major novelty is in the collective interaction paradigm

provided by its scalable stem and Simulated Projection Rendering

(SPR). We call it “through surface interaction”. Above surface

interactions[Hilliges et al. 2009] and below surface interactions[

Wigdor et al. 2006] has been explored by previous research

work. We believe “through surface” paradigm will further extend

the interaction space for surface computing. Haptic cues generated

by the stylus further enhances the perception of the 3D space

and allow users to manipulate and probe objects within the surface

with multimodal feedback. Furthermore, we derived a set of haptic

stimulations possible with ImpAct’s capabilities and created a

haptic model for ImpAct.

2 Implementation

We have developed the length changeable stylus integrated with the

actuation system to provide feedback. Furthermore, we developed

the simulated projection rendering (SPR) mechanism by tracking

linear length changes and angular motion of ImpAct and projecting

them on the digital space. Tracking the users eye position is also an

important feature for SPR. ImpAct is designed so that user grips it

e-mail: anusha@kmd.keio.ac.jp

Moving Shaft Outer Grip

Visible Interface of ImpAct

Internal end of

Moving Shaft

Internal S***cture

Shaft is attached to a DC

motor using rack-pinion gears

Figure 3: Haptic actuation mechanism and internal s***cture of

ImpAct

with an outer tube which consists of an inner shaft which can move

relative to user’s grip (Figure 3). Inner shaft is attached to an actuation

mechanism driven by a DC motor to provide kinesthetic haptic

sensation. Most of kinesthetic haptic devices made for HCI use a

grounding mechanism. In ImpAct, display surface itself is used as

the grounding. Orientation changes of ImpAct is tracked by a 3 dimensional

accelerometer/magnetometer mechanism and the length

changes are measured using a linear encoder. All measurements are

transmitted to the surface computer using a serial communication

channel and use to render the virtual stem and calculate relevant

haptic feedback.

ImpAct can be used as a general HCI tool, a 3D modeling tool in

CAD/CAM applications, in computer entertainment such as gaming

(Figure 1), in medical applications for probing, etc. We believe

ImpAct is able to open new interaction possibilities for surface

computing.

References

HILLIGES, O., IZADI, S., WILSON, A. D., HODGES, S.,

GARCIA-MENDOZA, A., AND BUTZ, A. 2009. Interactions

in the air: adding further depth to interactive tabletops. In UIST

’09: Proceedings of the 22nd annual ACM symposium on User

interface software and technology, ACM, New York, NY, USA,

139–148.

WIGDOR, D., LEIGH, D., FORLINES, C., SHIPMAN, S., BARNWELL,

J., BALAKRISHNAN, R., AND SHEN, C. 2006. Under

the table interaction. In Proceedings of the 19th annual ACM

symposium on User interface software and technology, ACM,

New York, NY, USA, UIST ’06, 259–268.

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