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Contour line generation method, system and device based on model shadow and storage medium

A contour line and shadow technology, applied in image data processing, instruments, calculations, etc., can solve the problems of low visibility and efficiency of calculation curves, and achieve the effects of improving analysis flexibility, improving analysis efficiency, and simplifying complexity

Active Publication Date: 2021-08-13
ZWCAD SOFTWARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art, one of the purposes of the present invention is to provide a method for generating contour lines based on model shadows, which can effectively solve the problem of low efficiency of calculating curve visibility of complex models based on geometric features

Method used

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  • Contour line generation method, system and device based on model shadow and storage medium
  • Contour line generation method, system and device based on model shadow and storage medium
  • Contour line generation method, system and device based on model shadow and storage medium

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Embodiment 1

[0051] This embodiment provides a method for generating contour lines based on model shadows. This method effectively solves the existing problem of low efficiency caused by calculating the visibility of curves based on geometric features for complex models. This method does not need to consider the geometric features of the model, and simplifies the contour line. The steps of the generation method can also control the accuracy of the generated contour line by controlling the view scale and the accuracy of the discrete points of the curve, making it easier for the user to control the accuracy of the result.

[0052] like figure 1 As shown, the contour line generation method in this embodiment specifically includes the following steps:

[0053] Step S1: Perform view transformation processing on the model object according to the required view ratio and required viewing angle, and project the view transformed model object onto the projection plane to obtain a shadow area;

[005...

Embodiment 2

[0074] In this embodiment, the system for generating contour lines based on model shadows implements the method for generating contour lines based on model shadows described in Embodiment 1, such as Figure 12 As shown, its system includes the following modules:

[0075] The view transformation module is used to transform the model object and the edge lines on the model object according to the required view scale and viewing angle;

[0076] The projection module is used to project the model object and the edge line after the view transformation into the projection plane;

[0077] A judging module, configured to judge whether the preset contour condition is satisfied between the edge line on the projection plane and the shadow area projected by the model object;

[0078] The output module is used to output the edge line area satisfying the contour condition as a contour line.

Embodiment 3

[0080] This embodiment provides an electronic device, which includes a processor, a memory, and a computer program stored on the memory and operable on the processor. When the processor executes the computer program, the first embodiment is implemented. The method for generating contour lines based on model shadows; in addition, this embodiment also provides a storage medium on which a computer program is stored, and when the computer program is executed, the above method for generating contour lines based on model shadows is realized.

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Abstract

The invention discloses a contour line generation method, system and device based on a model shadow and a storage medium, and the method comprises the steps: carrying out the view transformation of a model object according to a needed view proportion and view angle, and projecting the model object after the view transformation to a projection plane, so as to obtain a shadow region; and transforming the edge lines on the model object according to the same view proportion and view angle, mapping the transformed edge lines on a projection plane, carrying out condition judgment on the edge lines on the projection plane and a shadow region, and outputting the edge line region meeting a preset contour condition as a contour line. According to the method, the visibility of the edge line on the model object is calculated through a model shadow technology, geometric features of the model do not need to be considered, the complexity of contour line analysis can be simplified, and the analysis efficiency is improved; meanwhile, the user can zoom the model object according to the requirement so as to actively control the precision of the analysis result, and the analysis flexibility is improved.

Description

technical field [0001] The invention relates to the field of three-dimensional image geometric modeling, in particular to a contour line generation method, system, device and storage medium based on model shadows. Background technique [0002] In CAD, the commonly used contour line generation method is to calculate the visibility of the curve according to the geometric features. If the curve is invisible, it does not belong to the contour line, and vice versa. [0003] The above-mentioned method for calculating the contour line can obtain the precise visibility area on the curve, which is more suitable for simple models with less surfaces. However, for models with more complex surfaces, the amount of calculation for curve visibility will increase, the efficiency will drop significantly, the complexity of the algorithm will increase, and the maintenance cost will increase. Contents of the invention [0004] In order to overcome the deficiencies of the prior art, one of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/13G06T3/00G06T3/40G06T19/00
CPCG06T7/13G06T3/40G06T19/00G06T3/067
Inventor 周勇刘玉峰李会江冯征文黄伟贤甘文峰
Owner ZWCAD SOFTWARE CO LTD
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