Balancing User and System Control in Shape-Changing Interfaces

Rasmussen, Maria; Merritt, Timothy; Bruns, Miguel; Petersen, Marianne Graves

doi:10.1145/2839462.2839499

Cited by 54 publications

(17 citation statements)

References 33 publications

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“…4 Balancing control between a user and system is a core concern for the design of user interfaces-there is an increasing focus on negotiation of control and intelligent systems that can adapt depending on the context and changing needs of the user. 18 ProjecTables augments the CAD model directly on the sheet materials by use of a projector, which differs from using a screen-based interface. The disadvantage of a screen-based interface is that certain tactile qualities of a material, such as surface irregularities, cannot always be captured and represented on a screen, whereas using ProjecTables, the material can be manipulated-moved around and felt-directly on the preparation table/cutting bench with the hands.…”

Section: Discussionmentioning

confidence: 99%

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ProjecTables: Augmented CNC tools for sustainable creative practices

Rasmussen

Merritt

2018

International Journal of Architectural Computing

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Abstract. CNC cutting machines have become essential tools for designers and architects enabling rapid prototyping, model-building and production of high quality components. Designers often cut from new materials, discarding the irregularly shaped remains. We introduce ProjecTables, a visual augmented reality system for interactive packing of model parts onto sheet materials. ProjecTables enables designers to (re)use scrap materials for CNC cutting that would have been previously thrown away, at the same time supporting aesthetic choices related to wood grain, avoiding surface blemishes, and other relevant material properties. We conducted evaluations of ProjecTables with design students from Aarhus School of Architecture, demonstrating that participants could quickly and easily place and orient model parts reducing material waste. Contextual interviews and ideation sessions led to a deeper understanding of current work practices and sustainability issues with CNC cutting-machines, and identified useful features for interactive packing to reduce waste while supporting aesthetic concerns for exhibition quality design projects.

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Section: Discussionmentioning

confidence: 99%

“…4 Balancing control between a user and system is a core concern for the design of user interfaces—there is an increasing focus on negotiation of control and intelligent systems that can adapt depending on the context and changing needs of the user. 18…”

Section: Discussionmentioning

confidence: 99%

ProjecTables: Augmented CNC tools for sustainable creative practices

Rasmussen

Merritt

2018

International Journal of Architectural Computing

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“…Ninja track [26] is built up of sections hinged together, specifying the affordance of bendability -and by making the hinged sections visible, the user is provided with information about its potential to transform -although the fact that it is actuated might come as a surprise. The ReFlex phone [46] similarly rely on a familiar structure -pleats or origami as a way to specify it transformability potential.…”

Section: Information Specifying the Ability To Transformmentioning

confidence: 99%

“…ReFlex phone [46] (Figure 5) illustrates the impact of whether or not the movements occur with or without speed or direction changes, as the movements that simply result in a simple up or down movement of the surface of the phone, does not appear as animate, but as soon as the surface moves up and down, changing direction and speed without impact of any outside force, the phone seems to jump up and down as if an animate object seeking to grab the users attention.…”

Section: Movement Character and Trajectory Specifying (Level Of) Animacymentioning

confidence: 99%

“…Looking to the framework presented by Rasmussen et al [46], it illustrates how with SCIs, users do not always have full control over what and when the SCI changes shape, as seen in for example Spiky Starfish [30], ActuEater [34] and CoMotion bench [18]. Allowing the SCI (some) control over the movement and shape change, can be used to specify intentionality of the object, for example by preventing or encouraging/discouraging actions.…”

Section: Sentiency Specifying (Level Of) Animacymentioning

confidence: 99%

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Affordances of Shape-Changing Interfaces

Petersen

Rasmussen

Trettvik

2020

Proceedings of the 2020 ACM Designing Interactive Systems Conference

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Affordances is an important term in the field of Shape-Changing Interfaces (SCI). But the field is challenged by a multitude of vaguely defined concepts around affordances such as dynamic, spatial, or tactile affordances. In line with this, Alexander et al [1] recently pointed to lack of theory as one of the grand challenges for SCI. This paper proposes a re-analysis of Gibson for resolving the conceptual cacophony in the field of SCI. Essential to the ecological approach to affordances, is that perception is dynamic and people pick up information through exploring objects and environments over time. From this perspective, affordances of Shape-Changing Interfaces become a matter of providing Information-through the design-regarding a) the interfaces' ability to transform its shape and b) how movement suggests level of animacy. Through analyzing scholarly SCI prototypes, from this perspective, we provide an initial set of design strategies for affordances of shapechanging interfaces.

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A mechatronic shape display based on auxetic materials

et al. 2021

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Shape displays enable people to touch simulated surfaces. A common architecture of such devices uses a mechatronic pin-matrix. Besides their complexity and high cost, these matrix displays suffer from sharp edges due to the discreet representation which reduces their ability to render a large continuous surface when sliding the hand. We propose using an engineered auxetic material actuated by a smaller number of motors. The material bends in multiple directions, feeling smooth and rigid to touch. A prototype implementation uses nine actuators on a 220 mm square section of material. It can display a range of surface curvatures under the palm of a user without aliased edges. In this work we use an auxetic skeleton to provide rigidity on a soft material and demonstrate the potential of this class of surface through user experiments.

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Balancing User and System Control in Shape-Changing Interfaces

Cited by 54 publications

References 33 publications

ProjecTables: Augmented CNC tools for sustainable creative practices

ProjecTables: Augmented CNC tools for sustainable creative practices

Affordances of Shape-Changing Interfaces

A mechatronic shape display based on auxetic materials

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