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Overview
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If you are not familiar with using Light Path Expressions (LPEs), this page is a good place to start. The sections below will try to explain what LPEs are, how they work, and what are the possible use cases.
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The Advanced Light Path Expressions article goes into greater detail about complex LPE usage and concepts. |
What are LPEs?
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Light Path Expressions are a special type of render element with advanced capabilities. They use regular expression patterns to record selected events of light contribution along the path of a ray.
This can be used for very fine control in compositing by allowing you to tweak, for example, the GI coming from lights, the environment or self-illuminating objects separately, or each separate GI bounce, or the self-reflections of an object or the way SSS is seen behind refraction without re-rendering. The possible applications are practically endless.
Light Paths
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