-----------------------------------如果你说的自带的Volume Light（体积光源），这是不支持，目前最新的2014版本也不行，其次软件渲染器无法计算复杂的光源。
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颗粒和昆虫的体积阴影都应该远离光源，并有助于建立一个很好的空间感和透视。
The volumetric shadows from the particles and insects should all point away from the light source, and helps creating a nice sense of space and perspective.
采用场发射阴极的X射线光源具有体积小，辐射强度高，频率响应快，可以随时开启，无需预热的优点。
Using field emission cathode, X ray source can be made with several advantages: smaller volume and brighter, high frequency response, in-time turning on, etc.
小型测量仪及通讯仪器通常采用激光二极管作为其光源，这是因为它具有体积小、效率高、结构简单和价格便宜等优点。
Laser diode is used usually as light source in miniature measuring instrument and communication instrument because of its small volume, high efficiency, simple structure and low price.
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