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Learn how to use the Light Path node for Cycles
Blender’s light path node is incredibly useful for all sorts of tasks, but it’s also a bit difficult to grasp at times and so many of us are left with no understanding of how to use it. This tutorial gives you an introduction to the light path node, showing you what can be done with it in Cycles. However, it’s easier to understand how to use this tool when we know how render engines work, so we will give you a basic introduction to raytracing. You’ll also learn why it works, and what you need to know in order to use it effectively.
We will be taking a look at how to control the influence of created materials on other objects in our scene. This includes changing the color of an object inside a reflection, in the shadow, through refraction, or any number of other ways. It also covers how to hide objects from specific light paths, such that it appears invisible in reflections, doesn’t cast shadows, etc.