提高生成真实感图形速度的研究

The Study on Promoting the Speed of Forming the Picture of Real Sense

图形的真实感是指用计算机生成的图形反映客观世界真实的程度。真实感越强,人们获得的图形信息越完整、愈丰富,用计算机生成真实感图形,实际上就是基于光学物理的光照模型计算场景中景物各表面投射到观察者眼中的光强度大小和色彩分量,并将它转换成图形设备的颜色值,从而确定画面每一象素的颜色,最终生成图形——真实感图形。用计算机生成一幅真实感图形,首先要正确的描述景物几何图形,其次是计算出景物上有关部位各点的光亮度和色彩,这些都有较成熟的算法,但由于采用光线跟综算法,计算量很大.所以如何提高真实感图形生成速度是一个重要问题,本文对此问题进行了分析研究。

The sense o? reality of picture means the degree of reality of reflecting objective world which is reflected by the picture formed on computer. The stronger the sense of reality is. The perfecter and richer the data obtained by people is. In fact forming the picture of sense of reality on computer is computer the illumination and colour component, which are projected on spectator's eyes by the faces of relevant objects in scenery space, based on the illumination modle of optical physics.then transforming them into the colour value of picture equipment and determing the colour of each pixel of the picture-the picture of sense of reality.In order to form a piece of pictare of sense of reality, first of all the geomatrical picture of scenery object in scenery space should be correctly discribed, then the illumination and colour of each relevant points on scenery objects should be computed. In addition, because that the solution of global illumination modle is carried out with the ray tracing algorithm,the computing quantity of intersection of light and scenery is relatively large. Therefor promoting the speed of forming the picture of sense of reality is a very important problem. In this paper, the problems in this side have been analysed and approached.