MB Dev Notes added to critical classes.

src/engine/InterestManagement/Terrain.java

@@ -18,6 +18,14 @@ import java.util.HashMap;
 
 import static java.lang.Math.PI;
 
+
+// MB Dev Notes:
+// The Terrain class handles lookups into the Heightmap data.
+// It supports all current maps along with the differences in
+// their parenting configuration.
+//
+// Heightmap images are stored on disk in /mb.data/heightmaps/
+
 public class Terrain {
     public static final HashMap<Integer, short[][]> _heightmap_pixel_cache = new HashMap<>();
     public short[][] terrain_pixel_data;