A Shape Editing Method of B-spline Surface

A spline surface and surface technology, applied in the field of graphics processing, can solve the problems of lack of B-spline surface shape editing methods, etc.

A spline surface and surface technology, applied in the field of graphics processing, can solve the problems of lack of B-spline surface shape editing methods, etc.

CN108492372BActive Publication Date: 2020-04-03HARBIN INST OF TECH AT WEIHAI
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  • A Shape Editing Method of B-spline Surface
  • A Shape Editing Method of B-spline Surface
  • A Shape Editing Method of B-spline Surface

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Embodiment Construction

[0061] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention are clearly and completely described below. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0062]In the first step of the application method, the user draws several regularly distributed curves on the surface, hoping that the drawn curves will become the curvature lines on the optimized surface. Steps 2 and 3 change the shape of the surface by minimizing an objective function, so that the curve drawn by the user becomes an approximate curvature line on the optimized surface. The key here is the definition of the objective function. The second step of the metho...

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Abstract

The application provides a shape editing method for a B-spline surface. The method includes the following steps: firstly, drafting a curve on the curved surface to be a target curvature line; and secondly, changing the shape of the curved surface by minimizing a target function to make the curve drafted by a user become an approximate curvature line on the optimized curved surface. According to the shape editing method for a B-spline surface provided by the invention, the curve drafted by the user is taken as the target curvature line to optimize the shape of the curved surface to make the curve drafted by the user become the approximate curvature line on the optimized curved surface. The technology can edit the direction and distribution of the curvature line, improve the smoothness of the curved surface by improving the curvature line net of the curved surface, and provide a novel design tool for geometry modeling applications based on curvature line distribution on the curved surface.

Description

technical field [0001] The invention relates to the technical field of graphic processing, in particular to a shape editing method of a B-spline curved surface. Background technique [0002] B-spline surface is a commonly used surface representation in the industrial field, and it is widely used in the shape design of industrial products such as automobiles and aircraft. In some applications, the curvature lines of the surface are required to be evenly distributed and the umbilical points of the surface are less. For example, in the design and construction of complex building surfaces based on quadrilateral glass plates, the generated planar quadrilateral mesh must be along the direction of the curvature lines of the surface. An example is circular spline surface modeling, the boundary line of the circular surface patch is also the curvature line of the surface, in this type of application, it is hoped that there are fewer umbilical points on the surface model, and the distr...

Claims

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Application Information

Patent Timeline
03 Apr 2020
Publication
CN108492372B
IPC
G06T17/30; G06T19/20
CPC
G06T17/30; G06T19/20
Inventors
伯彭波; 郑荟莹