Interaction with computers using freehand gestures becomes more and more popular. However, it is hard to make precise inputs by making gestures in air without a physical support. In this paper, we present HorizontalDragger, a new selection technique aimed to improve the selection precision by converting the 2D selection problem into a 1D selection problem. After setting a region of interest in the display, all the objects inside the region are considered as potential targets. The user can drag the index finger horizontally to choose the desired target.

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To make constrained manipulation of 3D objects in desktop 3D applications, 3D transformation widgets are commonly used. However, their performance degrades on touchscreens because of low accuracy of touch inputs and the fingertip occlusion problem. In this paper, we present TouchSketch, a touch-based interface which allows users to perform independently fine-grained object translation, rotation and scaling on mobile devices. Our manipulation technique permits using the non-dominant hand to specify the manipulation reference while the dominant hand is used to determine the operation mode and control the transformation. In addition to 3D manipulation, TouchSketch provides also a set of functions to edit the shape of 3D objects. Users can use this application to accomplish rapid sketching tasks. We have conducted a user study to evaluate the efficiency of our manipulation technique. The results show that our technique outperforms a Widget-based technique regarding both the efficiency and fluency.

Figure 1: (Left) Axis constraints manipulation gestures for Classic3D and Single3D. (Right) Finger identification prototype.

In this paper, we introduce LayerStroke, a new touch-based selection technique for small targets located in a dense cluster. This technique aims to reduce the cluster density by dividing the targets space into different layers. To select a target, users can first select a layer by drawing a stroke on the screen. After that, targets inside the selected layer can be picked up by tapping the corresponding tiles. Our technique has two advantages. First, targets can be selected easily by using a simple combination of drag and tap gestures. Second, unlike some other acquisition techniques, no magnified view is necessary and the initial view can be used for selection. Mots-cléstarget acquisition ; touch input ; dense target selection.

In this paper, we present three freehand interaction techniques for 3D content manipulation, the FingerShake, for object translation, the FingerRotate, for object rotation and the FingerSwing for object scale. These three techniques refer to a more generic concept which we call FingerOscillation. The main contribution is to interact with the machine by using finger oscillation movements. We introduce the design and the implementation of these techniques.

Dans les applications de modélisation 3D sur PC, la manipulation avec contraintes d'objets repose sur l'utilisation des widgets de transformation 3D. Cependant, ces widgets sont moins efficaces pour une utilisation sur des écrans tactiles en raison de la faible précision des dispositifs d'entrée et des problèmes d'occultation. Dans ce papier, deux nouvelles techniques uni-manuelles de manipulation 3D sur TabletPC sont proposées. Basées sur l'identification des doigts, nos deux techniques associent l'index, le majeur et l'annulaire de la main dominante aux axes x, y et z du système de coordonnées. Après l'enregistrement de cette association axe-doigts, les utilisateurs peuvent effectuer différents gestes d'accords pour des manipulations avec contraintes sur les axes, sur les plans et des manipulations uniformes. Nous avons mené une étude préliminaire pour examiner l'apprenabilité et l'utilisabilité des gestes proposées. Les résultats indiquent que ces derniers peuvent être mémorisés rapidement. Certains gestes ont été jugés confortables et faciles à utiliser par les utilisateurs alors que d'autres nécessitent davantage d'investigations. Ces résultats permettent de donner des recommandations quant à la conception d'une technique uni-manuelle de manipulation avec contraintes qui peut être utilisée efficacement pour la modélisation 3D sur TabletPC.