Is it possible to trigger something when a certain threshold of illumination at a surface is reached? For instance to do something when the player shines a flashlight at an object?
Could you explain more about the design of your game? What do you want to trigger? Do you want to trigger something in the material or in the world? Does it matter which light is influencing the object or is it just that one spotlight?
Probably not doable in blueprint, but to easily check if a object is “lit” by attaching a camera to the light and check which object are rendered.
The following is doable in blueprint: You could also do a couple of ray casts from the light position to the light direction with length of light intensity. And do something based on that, but it really depends on what you want to accomplish.
We have not heard back from you in a few days, so we are marking this post as Resolved for tracking purposes. If you are still experiencing the issue you reported, please respond to this message with additional information and we will offer further assistance.