The Spotlight Reveal pack provides Blueprints and materials that let you use a Spotlight component to reveal previously hidden materials or modify them wherever the Spotlight points at. 

Use the Spotlight Reveal to implement features such as:

• Hidden messages/decals in the environment that'll show up when the Spotlight goes over them.
• A black light used in police investigations to reveal evidence in the environment, such as bloodstains that were previously not visible.
• Change the appearance of characters, surfaces, or props when they are pointed at with the Spotlight Reveal.
• Anything else you can think of!