Dassault Systemes

David Leo Bonner

Martin-Pierre Hugo Schmidt

Pascal Sebah

Jean-Marc Lachaume

Eloi Mehr

Jean-Francois Rameau

Claus Bech Wittendorf Pedersen

Fernando Manuel Sanchez Bermudez

Vincent Guitteny

Auxkin Ortuzar Del Castillo

Arnaud Deslandes

Mourad Boufarguine

Denis Nouais

Patrick Johnson

Romain Ducout

Pierre Ouok Chane Moui

Jean Saloux

Michael Frey

The disclosure notably relates to a computer-implemented method for designing a part by topology optimization. The method comprises defining a working volume for the optimization of the part and at least one boundary condition applied to the part, computing a vector field over the working volume, each vector of the field representing an optimal direction and a quantity of material corresponding to satisfy the at least one boundary condition, computing a set of flow lines by propagating from starting points in the vector field. For each flow line of the set, an element for the primary structure of the part is computed and a secondary structure of the part linking the set of primary as well as the secondary structure elements together is computed.

Designing a part by topology optimization

The disclosure notably relates to a computer-implemented method for designing a three-dimensional (3D) finite element mesh of a 3D part that includes a lattice structure. The method includes superposing a regular tiling of cells with a solid representation of the 3D part, partitioning the cells into two groups, a first group of cells, each in contact with the solid representation, and a second group of cells, none in contact with the solid representation. The method also includes computing a Boolean union of the first group of cells and the solid representation, the Boolean union forming a volume, finite element meshing the volume of the computed Boolean union while preserving the set of faces of the first group of cells that are shared with the second group of cells, and merging the finite element meshes of the cells of the second group and the meshed volume of the computed Boolean union.

3D finite element mesh of a 3D part that comprises a lattice structure

The disclosure notably relates to a computer-implemented method for designing a three-dimensional (3D) finite element mesh of a 3D part that comprises a lattice structure. The method includes superposing a regular tiling of cells with the solid representation of a 3D part, partitioning the cells into two groups, a first group of cells, each in contact with the solid representation of the 3D part, and a second group of cells, none in contact with the solid representation. The method also includes finite element meshing a boundary of the solid representation, extracting a boundary finite element mesh of the first group of cells, computing a Boolean union of the finite element mesh and the extracted boundary finite element mesh, finite element meshing a volume of the computed Boolean union and merging the finite element meshes of meshed volume of computed Boolean union and the cells of the second group of cells.

A computer-implemented method of computer vision in a scene that includes one or more transparent objects and/or one or more reflecting objects comprises obtaining a plurality of images of the scene, each image corresponding to a respective acquisition of a physical signal, the plurality of images including at least two images corresponding to different physical signals; and generating a segmented image of the scene based on the plurality of images. This improves the field of computer vision.

Producing a segmented image of a scene

A computer-implemented method for designing a manufacturable garment provides a three-dimensional shape representing a garment segmented into a set of three-dimensional panels (DP). Next the method computes for each three-dimensional panel, a corresponding flattened pattern (FP). The method defines a mesh (MF, MD) on each of said three-dimensional panels and flattened patterns; and simulates a draping of the segmented three-dimensional shape over a three-dimensional manikin (MK) by progressively imposing a constraint that each mesh element (ME) of said three-dimensional panels adopts dimensions (EEL) of a corresponding mesh element (MEF) of the corresponding flattened pattern while it conforms to the manikin shape. A computer program product, a non-volatile computer-readable data-storage medium and a Computer Aided Design system may carry out such a method. Also application of such a method to the manufacturing of a real garment.

Computer-implemented method for designing a manufacturable garment

The invention notably relates to a computer-implemented method for designing a three-dimensional modeled object that represents a physical entity. The method comprises providing sample points; determining a volumetric function, within a predetermined class of volumetric functions, as the optimum of an optimization program that explores orientation vectors defined at the sample points, wherein the optimization program penalizes a distance from the explored orientation vectors; and fitting the sample points with an isovalue surface of the volumetric function, wherein the program further penalizes oscillations of the fitted isovalue surface.

Fitting sample points with an isovalue surface

The invention notably relates to a computer-implemented method for designing a three-dimensional modeled object comprising providing sample points of 3D curves sketched by a user; determining a volumetric function, within a predetermined class of volumetric functions, as the optimum of an optimization program that explores orientation vectors defined at the sample points under the constraint that the explored orientation vectors be normal to the 3D curves and respect a minimal rotation propagation condition over each 3D curve, wherein the optimization program penalizes a distance from the explored orientation vectors; and fitting the sample points with an isovalue surface of the volumetric function.

Sample points of 3D curves sketched by a user

It is provided a computer-implemented method for creating a surface from a plurality of 3D curves. The method comprises providing a plurality of 3D curves, determining crossings between pairs of the curves, defining a base graph comprising nodes representing the crossings and arcs connecting pairs of nodes representing crossings that are neighbors, determining, from the graph, a mesh comprising vertices defined by a 3D position and edges connecting pairs of the vertices, and fitting the mesh with a surface. Such a method makes the creation of a surface from a plurality of 3D curves easier.

Creating a surface from a plurality of 3D curves

A method is provided for designing a 3D modeled object comprising the steps of providing at least one surface defined by a field of points of the surface and a field of normal vectors normal to the surface; and watermarking the object by modifying the field of points while keeping the field of normal vectors as it is. Such a method provides a technique for tracing a 3D modeled object modeled at least by a field of points of a surface and a field of normal vectors normal to the surface.

Watermarking of a 3D modeled object

A computer-implemented method of design of ruled surfaces may comprise the step of accessing data defining guiding curves P(u) and Q(v) and a cost function &#x192;(t,w). Given P(u) and Q(v), the unknown coupling is a parameterized curve s(t(s),w(s)). The method further comprises defining an objective function of the type J=J(&#x192;,t,w), involving both &#x192;(t,w) and coordinates t, w of the coupling curve. Then, optimizing the objective function J makes it possible to obtain the target coupling curve. Finally, a ruled surface S(s,&#x3bb;)=&#x3bb;Q(w(s))+(1&#x2212;&#x3bb;)P(t(s))is provided, according to the guiding curves P(t(s)) and Q(w(s)), composed with the coordinates t,w of the coupling curve previously obtained. In addition, the objective function is further constrained at the optimization step such that arguments t,w of the cost function &#x192;(t,w) are regulated by a regulation function &#x3bc;.

Computer-implemented method of design of surfaces defined by guiding curves

In a system and method for controlling a reflection line in a CAD system and for adjusting the shape of an object to correspond to a new reflection line, a user sets a reflection line as desired, and at least one constraint on the object. The system determines a shape of the object based on the new reflection line and the constraint. The shape of the object may be determined using energy minimization. Alternatively, the system and method may use vector springs to attract the reflection line to a free-form curve set by the user, and then determine the shape of the object based on the new reflection line and the constraint.

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Sevres, France

David Leo Bonner