Updated Object Model (markdown)

Object-Model.md

@@ -23,7 +23,7 @@ Both `grid` and `pack` objects include data representing voronoi diagrams and th
 * * `grid.cells.i`: `number[]` - cell indexes `Uint16Array` or `Uint32Array` (depending on cells number)
 * * `grid.cells.c`: `number[][]` - indexes of cells adjacent to each cell (neighboring cells)
 * * `grid.cells.v`: `number[][]` - indexes of vertices of each cell
-* * `grid.cells.b`: `number[]` - indicator whether the cell borders the map edge, 1 if `true`, 0 if `false`. Integers, not Boolean
+* * `grid.cells.b`: `number[]` - indicates if cell borders map edge, 1 if `true`, 0 if `false`. Integers, not Boolean
 
 * `grid.vertices`: `{}` - vertices data object, contains only voronoi data:
 * * `grid.vertices.p`: `number[][]` - vertices coordinates `[x, y]`, integers
@@ -44,13 +44,43 @@ Both `grid` and `pack` objects include data representing voronoi diagrams and th
 * * `pack.vertices.c`: `number[][]` - indexes of cells adjacent to each vertex, each vertex has 3 adjacent cells 
 * * `pack.vertices.v`: `number[][]` - indexes of vertices adjacent to each vertex. Most vertices have 3 neighboring vertices, bordering vertices has only 2, while the third is still added to the data as `-1`
 
+## Features data
+* `grid.features`: `object[]` - array containing objects for all enclosed entities of original graph: islands, lakes and oceans. Feature object structure:
+* *  `i`: `number` - feature id starting from `1`
+* *  `land`: `boolean` - `true` if feature is land (height >= `20`)
+* *  `border`: `boolean` - `true` if feature touches map border (used to separate lakes from oceans)
+* * `type`: `string` - feature type, can be `ocean`, `island` or `lake
+
+* `pack.features`: `object[]` - array containing objects for all enclosed entities of repacked graph: islands, lakes and oceans. Note: element 0 has no data. Stored in .map file. Feature object structure:
+* *  `i`: `number` - feature id starting from `1`
+* *  `land`: `boolean` - `true` if feature is land (height >= `20`)
+* *  `border`: `boolean` - `true` if feature touches map border (used to separate lakes from oceans)
+* * `type`: `string` - feature type, can be `ocean`, `island` or `lake`
+* * `group`: `string`: feature subtype. The variants are: 
+* * * `ocean` - is always `ocean`
+* * * `island` - `continent`, `island`, `isle` or `lake_island`
+* * * `lake` - `freshwater`, `salt`, `dry`, `sinkhole` or `lava`
+* * `cells`: `number` - number of cells in feature
+* * `firstCell`: `number` - index of the first (top left) cell in feature 
+* * `vertices`: `number[]` - indexes of vertices around the feature (perimetric vertices)
+
 ## Specific cells data
-### Grid object
+World data is mainly stored in typed arrays within `cells` object in both `grid` and `pack`.
 
 ### Grid object
 
+* `grid.cells`: `{}` - cells data object, including world data:
+* * `grid.cells.f`: `number[]` - _features_ indexes `Uint16Array` or `Uint32Array` (depending on cells number)
+* * `grid.cells.c`: `number[][]` - indexes of cells adjacent to each cell (neighboring cells)
+* * `grid.cells.v`: `number[][]` - indexes of vertices of each cell
+* * `grid.cells.b`: `number[]` - indicates if cell borders map edge, 1 if `true`, 0 if `false`. Integers, not Boolean
+
+### Pack object
+---
+
 # Secondary pack data
 Secondary data available as a part of the `pack` object.
+## Features
 ## Cultures
 ## Burgs
 ## States