Let's say I am a player walking in the game world I have created.I want to be able to see everything that is X units away from me and not more (if I want to see these things further away, I have to walk in that direction so that I am close to them).
How do I limit this kind of line of sight? I understand this can cause some complications; maybe it doesn't make sense to have this limitation on brick/terrain in the distance, but it makes sense for some other items so maybe there is a way to select what.
You could use fog, set the FogStart property in Lighting to how many studs away from the camera the fog starts, and you can set FogEnd to set a gradient to the fog being invisible to it being completely opaque.
Or you can make a custom chunk loader, which I don't know how to do so I can't really help you there