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Process for creating a parametric surface having a required geometrical continuity

一种参数化、曲面的技术，应用在图像数据处理、3D图像的加工、仪器等方向，能够解决没有公开高度优点等问题

Inactive Publication Date: 2007-02-21
DASSAULT SYSTEMES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] Furthermore, to the best knowledge of the inventors of the present invention, although the prior art generally suggests some relevant features and variations that produce parametric surfaces, the prior art does not disclose the highly advantageous aspects of the invention described below Characteristics

Method used

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  • Process for creating a parametric surface having a required geometrical continuity
  • Process for creating a parametric surface having a required geometrical continuity
  • Process for creating a parametric surface having a required geometrical continuity

Examples

Experimental program
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Embodiment Construction

[0050] The invention relates to a method suitable for use in CAD software. The user can control the process through a graphical user interface (GUI), which can be a typical CAD interface, with a conventional menu bar, and bottom and side toolbars. The menu bar and tool bar contain a set of user-selectable icons, each icon being associated with one or more operations or functions, as known in the art.

[0051] Some of the icons are associated with software tools for editing and / or presenting modeled objects. The software tools may also be grouped into workbenches. Unless otherwise configured, each workbench includes a distinct subset of software tools from the others. In particular, a workbench is an editing platform suitable for editing geometric features of modeled objects. In operation, the designer may for example pre-select a portion of an object and then start manipulating (eg changing shape, size, color, etc.) by selecting the appropriate icon and activating the appro...

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PUM

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Abstract

The invention is directed to a process for creating a parametric surface having a required geometrical continuity Gi, from a set of parametric elementary surfaces. Said process comprises a step of providing a set of parametric elementary surfaces, each elementary surface having edges, with vertices joining adjacent edges, each elementary surface having an internal continuity Cj at least equal to the required continuity Gi, the geometrical continuity between at least two elementary surfaces, across their common edge, being less than the required continuity Gi. Further, for each singular vertex, the process comprise steps of: defining a system of equations linking the parameters (including position coordinates of the usually called ''control points'') of the parametric elementary surfaces across all edges joined to the vertex and enforcing the required geometrical continuity across the joined edges; and solving the system of equations to obtain the parameters. Said singular vertex joins at least one edge across which the continuity between adjacent elementary surfaces is less than the required continuity Gi.

Description

technical field [0001] The present invention relates to the field of computer-aided design, in particular to computer-aided generation of parametric surfaces. Background technique [0002] Various systems and programs are available on the market for the design of parts and the assembly of parts, such as the applicant's product under the trademark CATIA. These so-called computer-aided design (CAD) systems allow users to construct and manipulate complex three-dimensional (3D) models of parts or assemblies of parts. [0003] Producing 3D computer graphics involves various steps, including modeling and processing steps (subdivision of base mesh, conversion into parametric surfaces, resurfacing...). [0004] A variety of different modeling techniques can be used to generate a model of a component. These techniques include solid modeling, wireframe modeling, and surface modeling. Solid modeling techniques are provided for topological 3D models, where a 3D model is, for example,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T15/00
CPCG06T17/30G06T17/20
Inventor 樊尚·尼格罗
Owner DASSAULT SYSTEMES