Terrain:

generate 200 x 200
interpolate x 10 in each direction
this map will be 1 km resolution
Useful for macro sim

pick points to place mountains at
use curves to generate rivers in data

for gameplay,
interpolate x 100 in each direction in memory for local areas to player
finally chunks are 16 x 16 x 16


sines going in x
cosines going in z
at different frequencies, with modifiers based on the percentage of each biome in the current coordinate
add the sines + cosines to the current interpolated height
Have a couple different instances of simplex noise at different frequencies and amplitudes that get phased in/out based on biome

2d perlin noise where "activation zone" is only values >0.9
when in activation zone x,z, have 3d perlin noise down to a given point that carves cavities
^should generate earthen pillars