There are several ways to add reflections inside Unreal Engine, each with its pros and cons. In the first part of this two-part Unreal Tips and Tricks video tutorial, we’ll cover the basic use of Scene Capture Actors. This method generates cube maps to approximate simple reflections that are highly performant.
For additional help, see the documentation: https://docs.unrealengine.com/en-US/Engine/Rendering/LightingAndShadows/ReflectionEnvironment
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