A big procedural overhaul

Good morning. Let's get to it.  Yesterday, while I was working at home for my day job a mechanic showed up (it was an appointment) to change some electric stuff and that means that for a while we did not have any electricity. I decided to spend the time on thinking about Holocene. This is what I came up with:

This is what it kind of looked like before yesterday and I backed up my project because...

Well, I agree. I owe you an explanation.  Well here it is. I'll try not to make this too technical. I made some design mistakes. The most important one is that I never considered a world with any size above one Unity terrain which is about 500 meters if I'm correct. I'm sure most of you know that setting up an ancient civilisation will not work on so small an area.

What I did now is plan for a system where the world can be really big. The above image is a tile. It looks like nothing worth spending time to discuss, but it'll change. In the game, we'll have a couple of these tiles rendering while we're walking around. This fits excellently with the first person camera view, because you can only see a couple of tiles at any given time, so why render all of it?

Second thing is that with Unity's terrain system,  we'd have a landscape that does not fit well with the low poly models that I have in mind, like the mammoth. I think it'll immediately look like a weird mash up of different art styles. With this regular geometric shape landscape, I think I can prevent that and keep the artistic coherence.

Lastly, and this is tied to the big world tile thing, I need rivers and seas to have this game the way I want it to be. Water its pretty easy to implement. Just have a landscape and drop a plane with a shader on a certain height et voilà. Problem is that that'll make for ponds and lakes, and not for seas really.

What I plan to make is a system where some of the tiles  (don't be surprised if that's over half of them, like Earth) sea tiles. I'll probably use some smooth Perlin noise to get some magnifier for the heights on that tile. Need to find out how that'll work in practice.

Rivers will be something else. I'm not sure about that either, but in my mind, I'll have something decide a random place above some height threshold and drop a river there. That river will flow down the slopes of the landscape until it hits water. Maybe it'll have to push through when it hits a depression with hills in all sides. Maybe that'll be a little lake.

Whatever I do there, I'll have to be mindful of the time it takes to generate the terrain. It's ok to have to take 20 seconds if need be and I'm sure the generation of the world will be one of the heaviest processes I'll ever have made until now, but let's bit have it take minutes unless it's absolutely necessary and let's certainly not have it take time during runtime.

Anyway. I thought I needed this blog post to explain myself and get my thoughts to paper. When I told my wife yesterday, she was not pleased by what she saw. I'm sure she is not the only one.  Besides, the Perlin noise thing for the seas, I came up with that piece of genius during the typing of this blogpost.