Thus, anything inside the event horizon, including a photon, is prevented from escaping across the event horizon by the extremely strong gravitational field.

因此，活动视界里任何东西，包括一个光子，靠非常强的引力场被避免从活动视界里逃逸出来。

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This article presents a two-pass algorithm to render the scene including participating media, and this algorithm is an expansion of the rendering to solid objects with photon mapping.

本文依据光子映射对实体物体的渲染，将其扩展到对包含参与介质的场景的渲染，为此提出了一个两路的渲染算法。

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