光线追踪

Its properties and tracing method are discussed. And the highlight-line model on triangular mesh surface is implemented. The theories put forward in this paper are demonstrated.

提出了三角网格曲面高光线模型的定义，讨论了相关性质及追踪方法，并在三角网格曲面上实现了高光线模型，验证了论文提出的相关理论。

In this paper, the effects of the rigid body motions and low frequency surface errors on the image quality were analyzed. Quadratic equations were used to build the mathematical model of the Wolter type I and II X-ray telescopes and reduce the computational complexity of ray tracing. With the help of a self-developed optical surface analysis code, the effects of the perturbations of the mirrors on the image quality was analyzed and the growth of the image spot formed by deformed telescopes was calculated, this is important for giving the reasonable fabrication tolerance.

在本篇文章中，详细分析了刚体运动误差和低频表面误差对成像质量的影响；使用空间解析几何学的二次曲面方程建立Wolter I、II型X射线掠入射望远镜镜片的数学模型，降低光线追踪的计算复杂度；借助自主开发的光学仿真软件分析了国内研制的X射线成像望远镜的刚体运动误差和低频表面误差对成像质量的影响，计算出像点艾里斑半径均方根值随误差变化的增长率，对工程上提出合理的制造公差的误差容限有重要的指导意义。

The tendency of these cameras to frontfocus when tracking in any light, combined with autofocus performance in backlit or shadowy conditions that can at times be poor, means that the EOS-1D Mark III with firmware v1.2.3 and EOS-1Ds Mark III with firmware v1.1.2 produce too many out of focus frames of subjects that are moving quickly.

不论在任何光线条件下，追踪对焦都有对焦前移的倾向，再加上逆光与阴暗环境下，自动对焦表现有时候很糟糕，这意味著 EOS-1D Mark III （ firmware v1.2.3 ）与 EOS-1Ds Mark III （ firmware v1.1.2）拍摄快速移动的物体，会有太多脱焦影像。

Tip 5: A mirror material is very similar to Chrome: Black diffuse color, no specular highlights and Raytrace 100% in the reflection map.

提示5：镜像材质和铬材质非常像：黑色的漫反射颜色，没有反射高光已经反射贴图里的100%强度的光线追踪。

For hundreds of millions of years, turtles have struggled out of the sea to lay their eggs on sandy beaches, long before there were nature documentaries to celebrate them, or GPS satellites and marine biologists to track them, or volunteers to hand-carry the hatchlings down to the water's edge lest they become disoriented by headlights and crawl towards a motel parking lot instead.

在数亿年前的时间里，海龟一直在挣扎着离开大海道海滩上产卵，时间远远遭遇自然纪录片的赞扬，或全球定位通讯卫星和海洋生物学家的追踪，又或者志愿者们用手把幼龟放在海边以避免它们受到光线的影响迷失方向，爬向汽车旅馆的停车场。

The results show that our method can quickly render realistic bokeh effects with faithful influences from the aperture shape and the vignetting.

绘制结果表明，利用该方法能够绘制出较为逼真的散景效果，正确模拟了孔径形状和渐晕对散景效果的影响，并具有较高的光线追踪效率。

It can also create fully raytraced reflections and refractions.

它也能够创建完全的光线追踪反射和折射。

In general, if you are using Raytrace to create reflections and refractions, the controls in the Basic Parameters rollout are the only ones you need to adjust.

一般地，如果你使用光线追踪材质创建反射和折射的效果，那么你只需要调整基本参数卷展栏中的控制项就可以了。

The reflections and refractions Raytrace material generates are more accurate than those produced by the Reflect/Refract map.

光线追踪材质所产生的反射和折射效果要比反射/折射贴图所产生的效果更加精确。

If you are unfortunate enough to the lovelorn, please tell me, I will help you out, really, please contact me!

如果你不幸失恋了，请告诉我，我会帮助你摆脱困境，真的，请联系我啦！

China's plan to cut energy intensity by 20 percent and pollutant discharges by 10 percent between 2006 and 2010 is a case in point.

中国计划在2006年到2010间降低20%的能源强度和减少10%的主要污染物排放，就是一个这样的例子。