sign by capturing and time-stamping click events. as presented in the introduction of this article, nam and Lee documented the design evaluation of a hand-held information appliance. They used arToolkit to track the position and orientation of the object; the optical marker is attached to the back of the object. In this case, a video-based ar HMD and a projector-based ar are compared and
Figure 7. thermostat mockup with rFID based interaction (Kanai et al., 2007).
evaluated; the projector-based ar display reportedly performs more accurately in the interaction
Kanai et al. (2007) developed a usability assess-
tests. nam (2005) expanded this simulation to the
ment tool to rapidly test interaction with mock-
interaction modelling of both screen and buttons
ups by rFID technology and video projection. The
for a hand-held tour guide by the use of state tran-
level of interactivity with the prototype is even
sition graphs. although the aspect of button inter-
higher when the user can model and interact with
action is well elaborated, the modelling of shape
a product simulation: simple tags can be glued on
and its features is limited (e.g., the location of
foam mockups and the user dons a glove with a
the buttons). Support to track layout modifications
rF antenna.
is lacking and this has to be performed manually.
Characterizing the IaP support scenarios The aforementioned design support scenarios can be characterized by three activities: browsing, interaction with the artefact’s behaviour and alteration of the model. In the table below, a brief summary is shown.
Interaction with behavior
type
browsing
Presentation
view model from all sides – either handheld or fixed to the environment
-
Interactive painting
view model from all sides – either handheld or fixed to the environment
-
adaptation of textures/ materials/ annotations
Geometric modeling
view model from all sides – either handheld or fixed to the environment
-
Creation of new geometry (curves/surfaces)
Layout design
view layout of multiple components
real-time rendering of environment (simulations)
Change assembly (2D or 3D)
Simulating information appliances
Manual handling (physical mockups)
Digital product interaction
Button/screen layout
Table 2. Characterization of IaP design support scenarios from literature.
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alteration of model
-