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                <term xml:lang="en">interaction</term>
                <term xml:lang="en">point cloud</term>
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                <term xml:lang="fr">nuage de points</term>
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              <p>A fundamental task needed when using a 3D virtual environment is the ability to select. This is necessary to perform local treatments, such as translating an object. While classical techniques, such as ray-casting, works well for large objects it becomes more difficult when the need for precision is greater and almost impossible for a point selection. To select a set of points in a point cloud we created a novel selection technique. It allows to select complex shapes while remaining simple to use. Using our technique relies on three principles: 1) selecting points consists in progressively elaborating a cylinder-like shape (the worm) through the sequential definition of several sections ; 2) a section is defined between two contours linked together with straight lines; 3) each contour is a freely drawn closed line. A user study reveals that our technique is significantly faster than a classical selection mechanism based on predefined volumes such as spheres or cuboids while maintaining a comparable level of precision and recall .</p>
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              <p>Une tâche fondamentale d'interaction dans un environne-ment 3D est la possibilité de réaliser une sélection. Elle est nécessaire pour appliquer des traitements locaux, comme le déplacement d'un objet. Bien que pour les objets larges les techniques classiques fonctionnent bien, comme le lancer de rayon, elles deviennent moins adaptées quand le besoin en précision augmente. Elles sont même impossibles à utiliser pour sélectionner des ensembles de points. Pour ces ensembles de points, nous proposons une nouvelle technique de sélection. Elle permet de sélectionner des formes complexes tout en restant simple d'utilisation. Elle repose sur trois principes : 1) la sélection de points consiste à progressivement élaborer une forme rappelant vaguement un cylindre à travers la définition itérative de sections ; 2) une section est définie par deux contours liés ensemble par des lignes droites ; 3) chaque contour est un tracé fermé dessiné librement. Les résultats d'une évaluation utilisateur établissent que notre technique est significativement plus rapide que les techniques plus classiques basées sur des volumes prédéfinis, comme des sphères ou des cuboïdes, tout en gardant un niveau de précision et de rappel comparable.</p>
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