From the course: V-Ray 5 for 3ds Max Essential Training

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Light Path Expressions workflow

Light Path Expressions workflow

From the course: V-Ray 5 for 3ds Max Essential Training

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Light Path Expressions workflow

- [Instructor] Light path expressions or LPEs for short are a very powerful, and I would definitely say advanced tool that can be used to extract very specific light contributions from a scene in order to create a separate render channel from them. A process that can give artists extremely fine control over an image in the compositing phase of a project. What LPEs do is describe or more accurately capture the passage of light rays through a scene that start from the camera, bounce between objects, and then finally end up reaching a direct light source. Information that can then be output from V-Ray and recombined in various ways inside a compositing package are inside V-Ray 5s newly revamped frame buffer if we would prefer. For example, with just the right LPE, we can capture a self reflections pass from a scene, we could grab just the first bounce of GI in an environment, we could capture only subsurface scattering that can…

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