Computer Implemented Method For Designing A Three-Dimensional Modeled Object Comprising A Curve And A Point Placed On The Curve

Patent metadata

Field	Value
Publication number	US-2017221275-A1
Application number	US-201715410300-A
Country	US
Kind code	A1
Filing date	Jan 19, 2017
Priority date	Jan 29, 2016
Publication date	Aug 3, 2017
Grant date	—

Abstract

A computer-implemented method designs a three-dimensional modeled object. The method: provides, in a three-dimensional scene, said three-dimensional modeled object comprising a curve (C) defined by a set of vertices (V 1 , V 2 , V 3 ) and a set of edges (E 1 , E 2 ) connecting said vertices. Next the method places a point (P) on the curve; stores an initial position of the point on the curve, relative to a first vertex (V 2 ); stores an initial position of the point within the three-dimensional scene; and modifies the curve by deleting the first vertex. The method further places the point onto the modified curve (C′) at a modified position (P′) situated at a minimal distance from the stored initial position of the point within the three-dimensional scene.

First claim

What is claimed is:

1 . A computer-implemented method for designing a three-dimensional modeled object comprising the steps of:
providing, in a three-dimensional scene, said three-dimensional modeled object comprising a curve (C) defined by a set of vertices (V 1 , V 2 , V 3 ) and a set of edges (E 1 , E 2 ) connecting said vertices; placing a point (P) on the curve; storing an initial position of the point on the curve, relative to a first vertex (V 2 ); storing an initial position of the point within the three-dimensional scene; modifying the curve by deleting the first vertex; and placing the point onto the modified curve (C′) at a modified position (P′) situated at a minimal distance from the stored initial position of the point within the three-dimensional scene.

2 . The computer-implemented method of claim 1 further comprising a step of modifying the curve again after the deletion of the first vertex, said step comprising changing the position of the point (P″) in the three-dimensional scene such that it remains on the curve (C″) and at a minimal distance from the stored initial position of the point within the three-dimensional scene.

3 . The computer-implemented method of claim 1 , further comprising a step of modifying the curve before the deletion of the first vertex, said step comprising changing the position of the point in the three-dimensional scene such that it remains on the curve and that its position with respect to said first vertex remains unchanged, and storing said changed position of the point in the three-dimensional scene.

4 . The computer-implemented method of claim 2 , further comprising a step of modifying the curve by restoring said first vertex, said step further comprising changing the position of the point (P′″) in the three-dimensional scene such that it remains on the curve (C′″) and takes the stored initial position with respect to the first vertex, and storing said changed position of the point in the three-dimensional scene.

5 . The computer-implemented method of claim 1 , wherein the initial position of the point on the curve relative to a first vertex is defined as the distance (D) between the point and the first vertex measured along the curve, or a function thereof.

6 . The computer-implemented method of claim 1 , wherein said three-dimensional modeled object (O) is a geometrical model of a physical object.

7 . A method of manufacturing a physical object comprising:
a computer-implemented design step, carried out by implementing a method according to claim 6 ; and a step of physically manufacturing said physical object according to said design.

8 . A computer program product, comprising:
a) a non-volatile computer-readable data-storage medium (M 1 -M 4 ) storing computer-executable instructions that design a three-dimensional modeled object; b) the computer-executable instructions including instructions to cause a computer system to:
provide, in a three-dimensional scene, said three-dimensional modeled object comprising a curve (C) defined by a set of vertices (V 1 , V 2 , V 3 ) and a set of edges (E 1 , E 2 ) connecting said vertices;
place a point (P) on the curve;
store an initial position of the point on the curve, relative to a first vertex (V 2 );
store an initial position of the point within the three-dimensional scene;
modify the curve by deleting the first vertex; and
place the point onto the modified curve (C′) at a modified position (P′) situated at a minimal distance from the stored initial position of the point within the three-dimensional scene.

9 . A non-volatile computer-readable data-storage medium (M 1 -M 4 ) comprising:
a) a memory area embodying computer-executable instructions (EXP) for design a three-dimensional modeled object; b) the computer-executable instructions including instructions that cause a computer system to:
provide, in a three-dimensional scene, said three-dimensional modeled object comprising a curve (C) defined by a set of vertices (V 1 , V 2 , V 3 ) and a set of edges (E 1 , E 2 ) connecting said vertices;
place a point (P) on the curve;
store an initial position of the point on the curve, relative to a first vertex (V 2 );
store an initial position of the point within the three-dimensional scene;
modify the curve by deleting the first vertex; and
place the point onto the modified curve (C′) at a modified position (P′) situated at a minimal distance from the stored initial position of the point within the three-dimensional scene.

10 . A Computer Aided Design system comprising:
a) a processor (P) coupled to a memory (M 1 -M 4 ) and a graphical user interface (KB, PD, DC, DY); b) the memory storing computer-executable instructions (EXP) that cause the Computer Aided Design system to design a three-dimensional modeled object by:
i) providing, in a three-dimensional scene, said three-dimensional modeled object comprising a curve (C) defined by a set of vertices (V 1 , V 2 , V 3 ) and a set of edges (E 1 , E 2 ) connecting said vertices;
ii) placing a point (P) on the curve;
iii) storing an initial position of the point on the curve, relative to a first vertex (V 2 );
iv) storing an initial position of the point within the three-dimensional scene;
v) modifying the curve by deleting the first vertex; and
vi) placing the point onto the modified curve (C′) at a modified position (P′) situated at a minimal distance from the stored initial position of the point within the three-dimensional scene.

11 . A computer aided design system as claimed in claim 10 wherein the memory further comprises instructions to cause the Computer Aided Design system to modify the curve again after the deletion of the first vertex, by changing the position of the point (P″) in the three-dimensional scene such that it remains on the curve (C″) and at a minimal distance from the stored initial position of the point within the three-dimensional scene.

12 . A computer aided design system as claimed in claim 11 , the memory further comprising instructions to cause the Computer Aided Design system to modifying the curve by restoring said first vertex, by changing the position of the point (P′″) in the three-dimensional scene such that it remains on the curve (C′″) and takes the stored initial position with respect to the first vertex, and storing said changed position of the point in the three-dimensional scene.

13 . A computer aided design system as claimed in claim 10 , the memory further comprising instructions to cause the Computer Aided Design system to modify the curve before the deletion of the first vertex, by changing the position of the point in the three-dimensional scene such that it remains on the curve and that its position with respect to said first vertex remains unchanged, and storing said changed position of the point in the three-dimensional scene.

14 . A computer aided design system as claimed in claim 10 wherein the initial position of the point on the curve relative to a first vertex is defined as the distance (D) between the point and the first vertex measured along the curve, or a function thereof.

15 . A computer aided design system as claimed in claim 10 wherein said three-dimensional modeled object (O) is a geometrical model of a physical object.

Assignees

• Dassault Systemes

Inventors

• Voirin Pierre
• Bianchi Laurent

Classifications

• G06T2219/2021

  Shape modification · CPC title

• G06F30/00

  Computer-aided design [CAD] · CPC title

• G06T19/20 Primary

  Editing of three-dimensional [3D] images, e.g. changing shapes or colours, aligning objects or positioning parts · CPC title

• G06T17/20 Primary

  Finite element generation, e.g. wire-frame surface description, {tesselation} · CPC title

• G06F2113/22

  Moulding · CPC title