Open World Inaccessible Areas, Best Approach?

I'm creating an open world, but there are areas that I don't want the player to go. What is the most optimal way to block them?
Use a series of planes and disable the mesh rendering?
Use a series of cubes with box colliders and disable the mesh rendering?

 

You don't need to disable renderers; if you want an invisible wall, just make an empty GameObject and add a BoxCollider to it.

(But of course invisible walls are lousy game design... please try to use these only as a last resort.)

 

Well the most "optimal" way would be to design the enviornmnt so they cannot get there, and not make it feel like they can. Skyrim is a good (mostly, early before later patches you could still get over the mountains sometimes) example as it surrounds the map with organic mountain flow that ensure players dont feel they are getting stiffed out of seeing part of the map.

The easiest way would be an invisible wall, but as pointed out that is really a terrible game design mechanic that shouldnt really be used

 

Wouldn't that mean a bunch of cliffs and boulders etc. with mesh or box colliders? If so, that doesn't seem as optimal, each one would have to be rendered individually, as apposed to using a single collider around them.....

I probably didn't ask the question correctly... I'm going to have terrain features that will visually look like a barrier, but I dont want to have a seperate collider for each of them..... just one collider. I've only been at this for a few months and I'm trying to avoid common mistakes.

 

Haha, thats Great, thanks! Exactly what I was looking for. I have been using ProBuilder but I haven't discovered the "collision chunks" yet. I'll check it out.

 

We used the BF approuch for our game, if you leave the battlezone you have 10 seconds to go back