We then specify where the observer s eye will be located . the ray tracing program will mathematically model the objects , the light rays and the observer and compute the colour for each pixel on the screen 光线追踪的程式会利用数学模型模拟物件光线及观察者之间的关系，从而计算观察者在电脑屏幕上应看到的影像。
Im not usually a fan of extraneous controls , but those on this model are quite useful : a slider you drag your finger along to change volume , and a circular pad you can use to scroll up or down pages with your finger 我虽然对电器的各种新奇功能一般不太感兴趣，但这个键盘的一些小功能却很有用，比如一个可用手指拖动的音量调节器，以及一个方便你在电脑屏幕上翻页的圆形旋钮。
Light sources are then set up at assigned locations . we then specify where the observer s eye will be located . the ray tracing program will mathematically model the objects , the light rays and the observer and compute the colour for each pixel on the screen 光线追踪的程式会利用数学模型模拟物件、光线及观察者之间的关系，从而计算观察者在电脑屏幕上应看到的影像。
I ‘ m not usually a fan of extraneous controls , but those on this model are quite useful : a slider you drag your finger along to change volume , and a circular pad you can use to scroll up or down pages with your finger 我虽然对电器的各种新奇功能一般不太感兴趣，但这个键盘的一些小功能却很有用，比如一个可用手指拖动的音量调节器，以及一个方便你在电脑屏幕上翻页的圆形旋钮。
15th , can and the computer reports to the police the central networking use , the computer control center after receives reports to the police , can automatically assign out reports to the police the user material , the real time display on the computer screen , and can differentiate the police sentiment category 15能与电脑报警中心联网使用，电脑控制中心在收到报警后，能自动调出报警用户资料，实时显示在电脑屏幕上，并能区分警情类别。
The second part is to develop the program of mtlcd about the magnetic tape wave - form process using matlab software . the mtlcd can display the signal of waveform with the magnetic record being erased in the screen of computer . the observer also can drought or zoom in the waveform at will 第二部分利用matlab作为开发工具编写磁带波形处理软件mtlcd ，该软件可将磁带被消磁后的波形信号显现在电脑屏幕上，并能对波形随意拉伸放大观察每一个细节。
Technology of gis will be applied to the system , the outcome of complex mail network management control , the post office layout , logistics distribution management positions with space - related issues , the post office sorting mail , the coverage , the streets covered , unit name , user groups reported boxes in the management of all the computer screen clearly 将gis技术应用到该系统中,结局错综复杂的邮运网络的管理调度、邮政局所的布局、物流配送管理等与空间位置有关的问题,邮局分拣配送段的覆盖范围、所覆盖的街道、单位名称、用户报箱群的管理等均在电脑屏幕上一目了然。
