It’s a common thing - to have certain objects highlight when a 1P character looks at them. This is often achieved with special materials and/or tags for the inspection objects. There is, however, a ridiculously simple way to do it that requires no special materials at all.
All you do is stick a spot light on the character’s nose and set its channel to 1 ONLY. You then set the inspection objects channels to 0 and 1. This means the object will receive light from the spot light and from the world around it. The spotlight itself will not illuminate the world.
Get within the spot light’s range, and the object will light up.
You can also, of course, colour the light, turn the channels on and off using scripts, change the range of the spot-light, its intensity, switch it on and off, etc. via code/blueprints.
I use this to add a subtle purplish glow to inspection objects. I also add a little pulse to it so it brightens and dims randomly.
Hope somebody finds this helpful!
Scy