Allow tile height to also play a part in determining the density of rocky patches.

src/clear_cmd.cpp

@@ -365,9 +365,9 @@ void GenerateClearTile()
 
 		IncreaseGeneratingWorldProgress(GWP_ROUGH_ROCKY);
 		if (IsTileType(tile, MP_CLEAR) && !IsClearGround(tile, CLEAR_DESERT)) {
-			uint j = GB(r, 16, 4) + _settings_game.game_creation.amount_of_rocks;
+			uint j = GB(r, 16, 4) + _settings_game.game_creation.amount_of_rocks + ((int)TileHeight(tile) * _settings_game.game_creation.height_affects_rocks);
 			for (;;) {
-				TileIndex tile_new;
+				TileIndex tile_new; 
 
 				SetClearGroundDensity(tile, CLEAR_ROCKS, 3);
 				do {

src/lang/english.txt

@@ -1461,6 +1461,8 @@ STR_CONFIG_SETTING_RIVER_AMOUNT                                 :River amount: {
 STR_CONFIG_SETTING_RIVER_AMOUNT_HELPTEXT                        :Choose how many rivers to generate
 STR_CONFIG_SETTING_ROCKS_AMOUNT                                 :Rocks amount: {STRING}
 STR_CONFIG_SETTING_ROCKS_AMOUNT_HELPTEXT                        :Determines the size of rocky patches. High values can cover a significant portion of the map.
+STR_CONFIG_SETTING_HEIGHT_ROCKS                                 :Rocks height modifier: {STRING}
+STR_CONFIG_SETTING_HEIGHT_ROCKS_HELPTEXT                        :Determines how much rocky patch distribution is affected by height. This is cumulative with the Rocks Amount setting and works best when the Rocks amount setting is set to lower values.
 STR_CONFIG_SETTING_TREE_PLACER                                  :Tree placer algorithm: {STRING2}
 STR_CONFIG_SETTING_TREE_PLACER_HELPTEXT                         :Choose the distribution of trees on the map: 'Original' plants trees uniformly scattered, 'Improved' plants them in groups
 STR_CONFIG_SETTING_TREE_PLACER_NONE                             :None

src/settings_gui.cpp

@@ -1817,6 +1817,7 @@ static SettingsContainer &GetSettingsTree()
 			genworld->Add(new SettingEntry("game_creation.rainforest_line_height"));
 			genworld->Add(new SettingEntry("game_creation.amount_of_rivers"));
 			genworld->Add(new SettingEntry("game_creation.amount_of_rocks"));
+			genworld->Add(new SettingEntry("game_creation.height_affects_rocks"));
 			genworld->Add(new SettingEntry("game_creation.tree_placer"));
 			genworld->Add(new SettingEntry("vehicle.road_side"));
 			genworld->Add(new SettingEntry("economy.larger_towns"));

src/settings_type.h

@@ -376,6 +376,7 @@ struct GameCreationSettings {
 	byte   river_route_random;               ///< the amount of randomicity for the route finding
 	byte   amount_of_rivers;                 ///< the amount of rivers
 	uint8  amount_of_rocks;                  ///< the amount of rocks
+	uint8  height_affects_rocks;              ///< the affect that map height has on rocks
 };
 
 /** Settings related to construction in-game */

src/table/settings.ini

@@ -3763,6 +3763,19 @@ str      = STR_CONFIG_SETTING_ROCKS_AMOUNT
 strhelp  = STR_CONFIG_SETTING_ROCKS_AMOUNT_HELPTEXT
 strval   = STR_JUST_COMMA
 
+[SDT_VAR]
+base     = GameSettings
+var      = game_creation.height_affects_rocks
+type     = SLE_UINT8
+guiflags = SGF_NEWGAME_ONLY | SGF_SCENEDIT_TOO
+def      = 0
+min      = 0
+max      = 25
+interval = 1
+str      = STR_CONFIG_SETTING_HEIGHT_ROCKS
+strhelp  = STR_CONFIG_SETTING_HEIGHT_ROCKS_HELPTEXT
+strval   = STR_JUST_COMMA
+
 ;;game_creation.build_public_roads
 [SDT_NULL]
 length   = 1