Dassault Systemes

Sebastien Rosel

Christophe Dufau

Jean-Marc Chauvet

François Melocco

Yannick Wargniez

Several elements are displayed on a computer display. The user is provided with a haptic device, for moving a cursor over the display. Distances between the cursor and the various elements are computed; the element with the smallest distance is highlighted on the display. When the user moves the haptic device, the identified element is changed, according to the distance between the cursor and the various elements. The user selects the identified element by actuating a select button. The invention makes it possible for the user to select one of the displayed elements, without having to move the cursor over the element to be selected. No prior knowledge of the shape of the elements is required for carrying out the selection process.

Process for selecting and handling objects in a computer-aided design system

A curve is created in a computer-aided design system, based on a set of points inputted by the user. A polyline is computed and the curvature envelope along said polyline is computed to determine particular points (A, A, A, A, A, A) on thepolyline, which are extrema of curvature. Segmenting points (M, M, M, M, M) are selected between pairs of particular points. A curve passing through the particular segmenting points is computed and is fitted to thepolyline. The process provides a curve that is well fitted to the set of points and does not require high skills from the user.

Process for drafting a curve in a computer-aided design system

A method and system for indicating curve connection continuity information in a graphical design system comprises steps and apparatus for determining values for measures of G1, G2, and G3 continuity at a junction point between curves. The continuity values are selectively displayed in a graphical display as respective tags adjacent or otherwise associated with the junction point at issue. The tags are updated as the shape of the curves are altered to provide a designer with a substantially real-time indication of the continuity of the curve junction. The display format of the tags can be altered to indicate when the respective continuity measure is within a predefined continuity tolerance level.

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Gif sur Yvette, France

Sebastien Rosel