I began by implementing multiple octaves of noise and tuning them to be navigable with the 3D platformer character controller. Then I added a gradient that would color each face of the mesh, depending on the height of the vertex. Every world has a unique color palette. Next, I added a skybox randomizer that would select a skybox from a list of eight different images. This choice brought different lighting and sky to each world.

While tinkering with the mesh generator, I experimented with modifying the coordinates of vertices based on their base position. I programmed terrain features, like plateaus, creators, and mountains, by modifying the base vertex coordinate by a constant or function. However, combining all of these features in one terrain would look messy, so I separated these into biomes.

All of the variables that I created were carefully tuned for each biome to make them as navigable as possible and yet still different enough to easily tell different worlds apart. 

Finally, I learned how to use raycasting. Ray origins are randomly determined above the terrain. When it intersects with the generated mesh, objects are placed randomly throughout the world, including the crystals that players collect, the portal, and then a random assortment of objects.