How to make a custom terrain?

You can write your topic however you want, but you need to answer these questions:

  1. As you know Roblox’s terrain system is not “well” enough so I want to see if its possible to make something special like in unity or unreal

  2. The issue is roblox’s Terrain is soo chunky and glitchy. Oh yeah also you cant add custom textures to it

  3. Im thinkinging editable meshes can be a solution but not well enough to be as good as terrain because of the math functions we need to create

 -- custom terrain generation script 

I dont want a perlin noise map or something I want a real terrain system

A lot of games still use triangle parts arranged into a mesh for this.