Visibility analysis rendering method base on principle of stencil shadow

A template and line-of-sight technology, which is applied in the field of visual analysis and rendering, can solve the problem of not being able to express three-dimensional effects

Inactive Publication Date: 2012-09-12
北京天下图数据技术有限公司
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Problems solved by technology

The rendering effect of the general vision analysis may be a fan. This metho

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  • Visibility analysis rendering method base on principle of stencil shadow
  • Visibility analysis rendering method base on principle of stencil shadow
  • Visibility analysis rendering method base on principle of stencil shadow

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Embodiment Construction

[0022] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0023] The present invention provides a visual analysis rendering method based on the template shadow principle, comprising the steps of: establishing a closed first polyhedron along the line of sight for the model of the area to be subjected to visual analysis; using the first polyhedron to The algorithm is rendered once, and the value in the template buffer that is not the first number is set to the second number; the second polyhedron with a closed line of sight is constructed; the algorithm is used to render the second polyhedron twice, and the obtained The value of the stencil cache includes the first number, the second number, the third number and the fourth nu...

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Abstract

The invention discloses a visibility analysis rendering method base on a principle of stencil shadow. The method includes steps of establishing a closed first polyhedron along the direction of sight lines for a model of an area which is to be subjected to visibility analysis; rendering the first polyhedron for one time by means of an algorithm, and setting a number which is not a first digit as a second digit in a stencil buffer; constructing a closed second polyhedron within the sight lines; rendering the second polyhedron for two times, wherein obtained values of the stencil buffer comprise the first digit, the second digit, a third digit and a fourth digit; and rendering an area where the value of the stencil buffer is the third digit, setting the area with visible colors, rendering an area where the value of the stencil buffer is the fourth digit, and setting the area with invisible colors. According to the visibility analysis rendering method base on the principle of the stencil shadow, by means of the principle of the stencil shadow, an invisible area is generated, the generated area has obvious edges and is free from distortion , and the accuracy of analysis results can be guaranteed, so that the visibility analysis area can be subjected to high-accuracy rendering.

Description

technical field [0001] The invention relates to a visual analysis rendering method based on the template shadow principle. Background technique [0002] General visibility analysis is divided into two-point visibility analysis and sight domain visibility analysis. Traditional visibility analysis has done a lot of work on quantitative analysis functions, such as calculating the visible distance and invisible distance, calculating the visible range and invisible distance. The area ratio of the viewing range and so on. Now with the 3D rendering function, the visible range and invisible range can be directly rendered in the 3D scene, which can greatly enhance the perceptual understanding of the results of the inter-visual analysis and obtain a strong visual effect. [0003] Two kinds of line-of-sight analysis: [0004] 1. Two-point visual analysis [0005] This line-of-sight analysis function is relatively simple, as long as there is an obstruction between the starting point ...

Claims

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Application Information

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IPC IPC(8): G06T15/60
Inventor 秦春关鸿亮单文刘巍
Owner 北京天下图数据技术有限公司
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