光线跟踪算法的跟踪方向与光传播的方向是相同(相反)的,是视线跟踪。()
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According to the passage, the New Urbanists cite which one of the following as a harmful result of the need for people to travel extensively every day by automobile？
A. It imposes an extra financial burden on the residents of sprawling suburbs.
B. It increases the amount of time people spend in situations in which antisocial behavior. occurs.
C. It produces significant amounts of air pollution and thus tends to harm the quality of people"s lives.
D. It decreases the amount of time that parents spend in enjoyable interactions with their children.
在多边形的逐边裁剪法中,对于某条多边形的边(其方向为从端点S 到端点P )与某条裁剪线(即窗口的某一边)的比较结果共有以下四种情况,分别需输出一些顶点。请问哪种情况下输出的顶点是错误的？()
A S 和P 均在可见一侧,则输出P
B S 和P 均在不可见一侧,则输出0个顶点
C S 在可见一侧,P 在不可见一侧,则输出S 和线段SP 与裁剪线的交点
D S 在不可见一侧, P 在可见一侧,则输出线段SP 与裁剪线的交点和P
To which of the following statements would New Urbanists most likely agree？
A. Suburban sprawl contributes to the thriving of civic life and civility.
B. Children growing up in urban neighborhoods were ill prepared for life in a diverse society.
C. Early-twentieth century urban neighborhoods should be the model for the modern neighborhood development.
D. The automobile and the lifestyle. that it makes possible bring people enjoyment and personal mobility.
阴影由两部分组成:本影和半影。位于中间的全黑的轮廓分明的部分称为半影(本影)。()
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