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Method for keeping line structure smoothing of constrained crosspoint

A technology of intersection and wire frame, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve time-consuming and labor-intensive problems

Inactive Publication Date: 2010-01-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the designer adjusts a certain curve to achieve smooth conditions, the result often makes this curve no longer maintain the original intersection constraints with some other curves, so some curves have to be redesigned, which is time-consuming and expensive. strenuous

Method used

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  • Method for keeping line structure smoothing of constrained crosspoint
  • Method for keeping line structure smoothing of constrained crosspoint
  • Method for keeping line structure smoothing of constrained crosspoint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0051] This CAD method takes Visual Studio 2005 in Windows XP as a development platform, and its specific implementation is as follows:

[0052] figure 1 is the original thread frame to be smoothed, the set of transverse lines C={c i |i=1,...,u}, the set of longitudinal lines D={d j |j=1,...,v}, horizontal line c i with longitudinal line d j The point of intersection between is P ij .

[0053] Each curve adopts the representation method of B-spline, and its form for the i-th horizontal line is:

[0054] c i ( t ) = Σ i = 0 n ( c i ) P i ( c i ) ...

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Abstract

The invention relates to a method for keeping an integral curved thread stand constrained by intersecting points smooth, and belongs to the CAD field of curves and curved surfaces. The method is characterized in that if the ratio of the number n of control vertexes of a curve to the number m of intersecting points contained in the curve is smaller than 1.5, the number of the control points of the curve is increased firstly; a parameter value of the intersecting points of the curve is recorded; an optical orientation value of each curve in the integral thread stand is appointed; a total constrained optimization function of the thread stand is generated; and a constrained optimization problem is converted into a non-constrained optimization problem for solutions. The curvature change of the curve in the thread stand can be more evenly based on the method, and the constraint of the primary intersecting points of transverse curves and longitudinal curves is kept, thereby, the method really reaches the effect of keeping the thread stand smooth integrally.

Description

technical field [0001] The invention relates to a method for smoothing a wire frame. technical background [0002] The development of a CAD system for curves and surfaces can free designers from the inconvenience of manual drawing, greatly improve the efficiency of product appearance design, and speed up the progress of product development. [0003] Designers generally design a set of backbone curves first, and then interpolate the contour surface based on these curves. Products that require good aerodynamic performance, such as airplanes and automobiles, usually require their curved surfaces to meet smooth requirements. Therefore, the wire frame design as a prelude to surface design is in a very critical position in the entire design process. The smoothness of the wire frame directly affects the smoothness quality of the generated surface. [0004] Since the wire frame is composed of two sets of horizontal and vertical curves, and there is also an intersection constraint ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 刘永进臧彧来煜坤胡事民
Owner TSINGHUA UNIV