move terrain documentation

docs/src/highlevel-design/highleveldesignindex.md

@@ -2,3 +2,4 @@
 
 [TOC]
 - @subpage macroWorldPartitioning
+- @subpage terrainOrganization

docs/src/highlevel-design/terrainOrganization.md

@@ -1,25 +1,31 @@
-Terrain:
+@page terrainOrganization Terrain Organization
 
+```
 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
-
+```