Realistic Terrain Generation Mod 1.12.2/1.10.2 is the mod for Minecraft that makes all screens in the game look much more realistic. It does not add new blocks or new biomes at all.
All it will do is to rearrange the blocks in the vanilla terrain and change colors of blocks to make them more realistic. Since there are not many changes that are added to the game, so it does not require a high-performance PC system.
It does not have any configurable option since you can turn it off when you think it is not necessary anymore. You can have a look at the screenshots that we have provided below the article to decide whether you like it or not.
If you like it and would like to install it in your Minecraft game, remember to install Minecraft Forge before. It is a useful application that lets players launch any mod to the game.
Screenshots Realistic Terrain Generation Mod