better biomes, but not balanced

src/main.lua

@@ -5,29 +5,47 @@ local lume = require "lib.lume"
 local map = {}
 
 local biomes = {
-  water = {
-    altitude = {min = 0, max = 0.2},
+  [1] = {
+    name = "water",
+    altitude = {min = 0, max = 0.9},
+    temperature = {min = 0.1, max = 0.9},
+    humidity = {min = 0.8, max = 1},
     color = {0, 0, 1, 1},
   },
-  sand = {
-    altitude = {min = 0.2, max = 0.215},
+  [2] = {
+    name = "sand",
+    altitude = {min = 0.2, max = 0.9},
+    temperature = {min = 0.2, max = 1},
+    humidity = {min = 0, max = 0.2},
     color = {1, 1, 0, 1},
   },
-  grass = {
-    altitude = {min = 0.215, max = 0.34},
+  [3] = {
+    name = "grass",
+    altitude = {min = 0.3, max = 0.9},
+    temperature = {min = 0.2, max = 0.8},
+    humidity = {min = 0.3, max = 0.6},
     color = {0, 1, 0, 1},
   },
-  trees = {
-    altitude = {min = 0.34, max = 0.72},
+  [4] = {
+    name = "trees",
+    altitude = {min = 0.4, max = 0.7},
+    temperature = {min = 0, max = 0.7},
+    humidity = {min = 0.1, max = 1},
     color = {0, 0.67, 0, 1},
   },
-  stone = {
-    altitude = {min = 0.72, max = 0.9},
+  [6] = {
+    name = "stone",
+    altitude = {min = 0, max = 1},
+    temperature = {min = 0, max = 1},
+    humidity = {min = 0, max = 1},
     color = {0.67, 0.67, 0.67, 1},
   },
-  ice = {
-    altitude = {min = 0.9, max = 1},
-    color = {1, 1, 1, 1}
+  [5] = {
+    name = "ice",
+    altitude = {min = 0, max = 1},
+    temperature = {min = 0, max = 0.1},
+    humidity = {min = 0.1, max = 1},
+    color = {1, 1, 1, 1},
   },
 }
 
@@ -55,7 +73,7 @@ love.load = function()
   for x = 0, map.temperature.w do
     for y = 0, map.temperature.h do
       local distance = math.abs(y - center_y)
-      map.temperature[x][y] = lume.clamp(map.temperature[x][y] - distance / map.size / 2, 0, 1)
+      map.temperature[x][y] = lume.clamp(map.temperature[x][y] - distance / map.size, 0, 1)
     end
   end
   heightmap.normalize(map.temperature, 0, 1)
@@ -74,13 +92,17 @@ love.load = function()
     map.terrain[x] = {}
     for y = 0, map.size do
       if lume.distance(x, y, map.size / 2, map.size / 2, true) < radius then
-        for name, biome in pairs(biomes) do
-          local value = map.altitude[x][y]
-          -- this allows a non-deterministic change of terrain
-          --  depending on which biome is checked first but I don't care right now]
-          if value >= biome.altitude.min and value <= biome.altitude.max then
-            map.terrain[x][y] = biome.color
-            break
+        for _, biome in ipairs(biomes) do
+          local altitude = map.altitude[x][y]
+          if altitude >= biome.altitude.min and altitude <= biome.altitude.max then
+            local temperature = map.temperature[x][y]
+            if temperature >= biome.temperature.min and temperature <= biome.temperature.max then
+              local humidity = map.humidity[x][y]
+              if humidity >= biome.humidity.min and humidity <= biome.humidity.max then
+                map.terrain[x][y] = biome.color
+                break
+              end
+            end
           end
         end
       end