add camera collision without CharacterController

It is very important to add that if you use this method, you also need a rigid body. This changes game logic and would likely require some changes to code, but an important rule is:

Never add static colliders to dynamic objects without a rigid body.

The physics engine will hate you forever and nothing will work properly without a rigid body.

I didn't know that. I though rigid bodies were used only for object that could potentially move.

So what you're saying is:

1) that if I have to create a big wall, that wall should have a rigid body?

2) Or you mean to add the rigid body to the camera because the camera does move?

I'm guess you mean (2), but just wanted to check!

Let me clarify that by dynamic objects I mean objects that (might) move. As opposed to static objects which are objects that don't move.

To answer your question. My statement is more like #2. Any object that might move needs to have a rigid body for the simulation to work accurately and efficiency.

Objects like walls and floors are fine just having a collider. They never move. But for moving objects, rigid bodies tell the Physx engine that the object is dynamic and that it needs to check to see if the object moved into another collider every cycle.