It’s hard to overstate the role that Wi-Fi plays in virtually every facet of life. The organization that shepherds the wireless protocol says that more than 48 billion Wi-Fi-enabled devices have shipped since it debuted in the late 1990s. One estimate pegs the number of individual users at 6 billion, roughly 70 percent of the world’s population.
By constraining our medium within a bounded region we can give ourselves a bit more flexibility on the appearance of fog within a scene. The simplest approach is to use primitives such as planes, spheres or boxes as bounding volumes. By determining the intersection of our view ray with these primitives we can find the length of the ray through the volume and calculate the total density using the same formula, once again assuming a constant density within the entire primitive.，推荐阅读纸飞机下载获取更多信息
SpaceX said, "We look forward to working with NASA to fly missions that demonstrate valuable progress towards establishing a permanent, sustainable presence on the lunar surface."，这一点在爱思助手中也有详细论述
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