Method for rendering contour edges of models

Abstract

The invention discloses a method for rendering contour edges of models. The method includes drawing a model to be contoured to a preset rendering target; converting coordinates of a model bounding box, copying the preset rendering target and corresponding projection coverage range to a contouring bitmap; determining texture coordinates of the projection coverage range to generate a planar rectangle vertex data stream according to attributes of a background buffer area and the projection coverage range; determining contour edges of the model on the surface of an original rendering target according to a preset template of the background buffer area, and rendering the contour edges according to the preset scheme. By the method for rendering the contour edges of the models, the background buffer area is processed locally by the aid of the bounding box, the color, the depth and the template in the pixel space, load to a central processing unit and a diagram processor is reduced, varieties of rendering of the contour edges are developed to the greatest extent, extendability of rendering effect is improved and rendering efficiency is improved.

Description

technical field [0001] The invention relates to computer graphics rendering technology, in particular to a method for rendering model contour edges. Background technique [0002] Due to the large number of characters in online games, in order to highlight the target, it is necessary to render the outline and edge of the characters to increase the contrast between things and the border. It can not only provide simple and effective information prompts to players, but also add luster to the overall picture. [0003] figure 1 It is a schematic diagram of the contour edge in geometric space. Such as figure 1 As shown, assuming that the viewing direction is the vector V, the surface normals of the polygonal planes V0 and V1 are Face 0 and Face 1 respectively, it can be seen from the figure that the edge AB is a silhouette edge, then (V·Face 0)(V·Face 1)<0, that is, among the two polygon planes V0 and V1 sharing the silhouette edge AB, one can be seen from the viewpoint posit...

AI Technical Summary

Problems solved by technology

The outline edge rendering effect of this scheme is natural, but this scheme also has the following disadvantages: a) Large data requirements: the data bitmap usually only records vertex information and normal information, and other information needs to add additional channels, and the amount of data will be larger; b ) takes a lot of time to calculate: for post-effect processing, it needs to operate on the full screen, it takes more time to record and read the data bitmap, and at the same time, the calculation overhead will be more; c) the rendering method is single: in order to ensure the cost performance, The color information of the stroke is usually not written, the stroke method and color are more simple, and the information prompt effect is not intuitive enough

This technical solution makes it possible to obtain a better improvement effect than the existing subdivision technology on the basis of not using additional dedicated hardware. When the model is occluded, the mapping from user space to plane space needs to be divided into multiple individual lines or filling paths, and then rendered separately one by one, which increases the CPU load and poor scalability

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