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(a) the user points to the region where the

desired object is located; (b) starting a touch

rearrange the subset of objects pointed by

the volume casting technique over a selection

canvas; (c) the canvas has an absolute

mapping to the mobile device touchscreen,

the user slides his thumb in order to point

out the desired object and selects it with a

touch take off gesture

Difficulty of selection is proportional to

the amount of objects in the second step;

in (a), (b) and (c) there are 25, 97 and 224

objects, which were the distractors

densities used for preliminary evaluation

Disambiguation canvas is a

technique for selection by progressive

refinement using a mobile device and

consisting of two steps. During the first,

the user defines a subset of objects

through the orientation sensors of the

device and a volume-casting pointing

technique. The subsequent step consists

of disambiguating the desired object

from this subset using the mobile device

touchscreen.

Selection by progressive refinement

proposes the breakdown of a selection

task into effortless subtasks, avoiding

the attention and precision usually

required by traditional selection

techniques [3]. We use the observed

high precision of control provided by

the touchscreen [1, 2] to allow the

disambiguation of the desired object

among a subset of hundreds of other

objects in only one step of refinement.

Unitymol is a molecular and

biological network viewer developed

on the Unity 3D game engine. The

viewer allows access to the Worldwide

Protein Data Bank that contains over

60,000 high-resolution protein

structures available. The viewer focus

on molecular visualization using

surfaces, spheres and links between

them. An original algorithm based on

hardware capabilities sucha as GPU isused to provide a realistic scenario,

based on current research.

Unitymol, besides the viewing allows

interaction with the molecules. It is

possible to translate and rotate

molecules with six degrees of freedom

to ease visualization. Integrating the

disambiguation canvas with Unitymolhas the potencial to provide a more

intuitive interaction with molecules.

Users may be unable to reach all the

touchscreen. Thus we defined two area

layouts (a and b) to limit the usable area,

and optionally a calibration procedure (c)

Three-dimensional gestures captured by

sensors in the smartphone combined

with the two-levels interaction of the

disambiguation canvas is expected to

provide better user performance and

experience in manipulating molecules.

Contact:marcio.mello@inf.ufrgs.br

Graphical Methods Used: unitymol use the graphical resources available inUnity 3D. Graphical primitives like sphere and cubes are used to render atoms (for

molecular structures) or nodes (for networks); links between them are rendered

using lines.

In this ongoing work, we plan to

iteratively evaluate and adapt the

disambiguation canvas design to better

fit the molecule manipulation task. The

resulting technique and an analysis of its

use as an interactive visualisation toolwill be presented in a near future.

Mrcio Mello, Henrique G. Debarba, Anderson Maciel

and Luciana Nedel

3 D I n t e r a c t i o n w i t h C l u t t e r e d

D a t a s e t s

A b o u t

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