This is a set of video's of the demo's that can be...
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This construct 3 demonstration shows how to use the ray casting & line of sight functionality.
Get the template here : howtoconstructdemos.com/lasers-hitting-obstacles-raycasting-feature-of-los-behavior-c3p
Contact me on Fiverr if you want further assistance :
https://www.fiverr.com/bartalluyn/assist-you-in-creating-your-construct-3-project