unity - Create a seemless grid-based polygonal tileset

The aesthetics I am going for is demonstrated by many simulation games such as Simcity. But I am looking at this particular example: Polygonal Planet Project by Oskar Stålberg.

I understand the concept: when the player places or upgrades a tile, the game looks at adjacent tiles to figure out which tile should be used. And in most cases, a tile would be self-contained, so I just need to design all possible variant of such tile.

And I have some experience on procedural generation in 3D, so coding isn't the main problem for me.

What I am wondering, are:

• Does this type of continuous 3D tilesets have a name? I tried to google some examples/tutorials but failed to find the appropriate keyword.



• Are there tools to make the process of creating tile variants easier?


• Is there a preferable process to create such tileset? Do I start by creating structures then divide them into repeatable patterns, or should I start with basic tiles and find way to create smooth transition between them?

That's probably too much to answer in detail, but I would like some pointers on this topic (more about asset design than programming I suppose). Thx!