I added a sphere collider to my third-person camera to prevent it from passing through my terrain (and viewing the “infrastructure” of the terrain) but the camera still passes through the terrain. What else do I need to to do prevent the camera from passing through the terrain? Yes, the terrain has a terrain collider.
It depends on how everything is set up. How are you making your camera follow your player? Did you parent the camera to the player? This could cause glitches because the camera is essentially teleporting closer and closer to the player(translate). Need a little more info to really be helpful though.