How can you configure/create a material that will only block the light from either way, but not block visibility?
Think of it this way: you have a window to your house, and you want no light from going inside, but you also don’t want the light from inside to go outside, while at the same time you want to see from outside in. Visibility to outside from inside doesn’t matter, but preferable not be affected either, but it is not a problem if it is blocked.
Then after you have this material, should you apply it to a Cube or Plane shape?
//Edit:
I did tried the simple thing, to add a Cube, turn Visibility “Off” and turning “On” Hidden Shadow, which means it will still cast shadow, but it doesn’t block all light.
So maybe this isn’t as much as a material thing, but actually a problem with light passing through objects? Directional Light to be more precise, as normal lights are blocked. Is there a way to stop Directional Light from passing through objects? Or maybe you can actually make a material that will also block Directional Light.