What is the procedure or process called for making terrian look like it continues but doesnt?

I am not sure what the process or procedure for this particular part is called. When I come to the edge of the terrain or level, it should look infinite without it actually being infinite. Do you use a second camera to mirror level 2 into level 1 so that it looks infinite and right as you walk into the next level? Do you use a small version of the landscape and a camera to project anything further than the ledge, 360 in whatever direction are you traveling? Any help would be much appreciated. Thanks

for most games you can never reach the edge of a terrain where it just ends. usually theres collision that limits the play area then the terrain is extended far enough beyond that point so as to look like the horizon. this applies for open world games too, look at world of warcraft your surrounded by water (goes to horizon) and your limited how far out you can go via a fatigue meter. now you mention multiple levels, im assuming that your talking about level streaming with this part. for level streaming you would have the level stream in before the player could see the edge, you can also mask things with fog for instance to hide draw distance. or your doing traditional levels (not streamed) you could limit what the player can see beyond the first level via a canyon, tight hall, door, portal etc. you could also build a small portion of the next level and have it viewable but limit how far it can be viewed.

not sure if thats of any help and i didnt quite completely understand what you were asking, but food for thought.

I appreciate you taking the time to answer. Level streaming may be what I am looking for, or at least a good lead to do some research, sure google will pull some other results as well. Lol, the problem was I didnt know what to ask google for specifically. Any landscape related questions usually pulls up as either lanscape editing, paint or heightmaps. A buddy said something about using a terrian that is way smaller and a duplicate of the first , then using a camera to render each edge of a squared terrian, from the small to the normal when coming up to an edge. Wasnt sure what the process for that was called either, you knkw anything about that? Thank you for pointing me some direction.