Huge Terrain

Supp guys…

So I want to create a huge terrain and I got couple of questions before starting to work on it…

First of all, I was searching forums as well as Unity Answers, I found couple of threads, but I wasn’t able to find anything useful for me…

My objective is to create a really huge terrain (“open world”)… I know I can’t handle it in one Unity terrain object, so I will have to make more of these… But here is where it starts to be complicated… I won’t make this huge terrain at once, for example I want to have countries separated by mountains, or rivers or maybe the sea (that’s not really important) so first I will create the first country and then I will work on it, you know, details… Later I will want to add another country… So I don’t want to creste the whole huge terrain at once, I want to work on it gradually…

Question #1: Can I somehow edit (Paint a texutre, edit hights) more terrains at once? Just to be sure that the borders will fit… Will have same texture and height and it will look like one terrain. I read somewhere that I can create a terrain and then divide it to 4 piecies with script… But what to do when I want to add another country…?

Question #2: Can be this achieved by exporting, editing and importing heightmaps? I have no experience with heighmaps at all…

Question #3: What about loading the terrain while playing? I read somewhere (yeah yeah again) that Unity loads only visible terrain, or I can use Occlusion Culling (I know it’s only in Unity Pro) will this be enough? Of course I will have to script loading and disabling static game objects…

If you have better idease you can always tell me and of course thanks everyone.

Terrain Composer has really good tools for editing a grid of connected terrains.

SECTR STREAM (my product) has good tools for exporting that data and streaming it in as you move around the world.

Thank you for you reply… I’ve already found a free tool which can help me get terrains together… It’s called Terrain Stitcher, TerrainStitcher v1.0 - free for non-commercial use - Community Showcases - Unity Discussions