Visibility analysis rendering method base on principle of stencil shadow

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 ...

AI Technical Summary

Problems solved by technology

The rendering effect of the general vision analysis may be a fan. This method is only expressed on a plane and cannot express a three-dimensional effect.

Images