more 'definitions' to experiment with - I think I need to start over with normalized values BEFORE expanding

src/main.lua

@@ -5,107 +5,166 @@ local lume = require "lib.lume"
 local map = {}
 
 local biomes = {
-  [5] = {
+  -- [5] = {
-    name = "ocean",
+  --   name = "ocean",
-    altitude = {min = 0, max = 0.2}, -- bottom of world is the only part that matters
+  --   altitude = {min = 0, max = 0.2}, -- bottom of world is the only part that matters
-    temperature = {min = 0, max = 1},
+  --   temperature = {min = 0, max = 1},
-    humidity = {min = 0, max = 1},
+  --   humidity = {min = 0, max = 1},
-    color = {0, 0, 0.67, 1},
+  --   color = {0, 0, 0.67, 1},
+  -- },
+  -- [6] = {
+  --   name = "beach",
+  --   altitude = {min = 0.2, max = 0.205}, -- just above ocean
+  --   temperature = {min = 0, max = 1},
+  --   humidity = {min = 0, max = 0.8}, -- excluding upper humidity for swamp
+  --   color = {1, 1, 0.33, 1}, -- brighter yellow to distinguish from sand
+  -- },
+  -- [8] = {
+  --   name = "swamp", -- fun idea, but generates between ocean and water too often?
+  --   altitude = {min = 0, max = 1},
+  --   temperature = {min = 0.5, max = 1},
+  --   humidity = {min = 0.95, max = 1},
+  --   color = {0, 0.5, 0.33, 1},
+  -- },
+  -- [10] = {
+  --   name = "water",
+  --   altitude = {min = 0, max = 0.9}, -- top excluded because it should've gone downhill
+  --   temperature = {min = 0.1, max = 0.9}, -- bottom should be ice, top should evaporate
+  --   humidity = {min = 0.8, max = 1}, -- only the wettest places
+  --   color = {0, 0, 1, 1},
+  -- },
+  -- [20] = {
+  --   name = "sand",
+  --   altitude = {min = 0.2, max = 0.9}, -- top falls down, bottom is underwater
+  --   temperature = {min = 0, max = 1},
+  --   humidity = {min = 0, max = 0.2}, -- only where dry makes more sense for a desert
+  --   color = {1, 1, 0, 1},
+  -- },
+  -- [30] = {
+  --   name = "grass",
+  --   altitude = {min = 0.3, max = 0.9}, -- top of the world not enough air, bottom too wet / leaving space for others
+  --   temperature = {min = 0.2, max = 0.8}, -- not very sensitive to temperature
+  --   humidity = {min = 0.2, max = 0.6}, -- not very sensitive to humidity; but excluded from the worst
+  --   color = {0, 1, 0, 1},
+  -- },
+  -- [40] = {
+  --   name = "trees",
+  --   altitude = {min = 0.4, max = 0.7}, -- more sensitive than grass
+  --   temperature = {min = 0, max = 0.7},
+  --   humidity = {min = 0.3, max = 0.8}, -- these are not desert trees, they need more water
+  --   color = {0, 0.67, 0, 1},
+  -- },
+  -- [60] = {
+  --   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},
+  -- },
+  -- [50] = {
+  --   name = "ice",
+  --   altitude = {min = 0, max = 1},
+  --   temperature = {min = 0, max = 0.01},
+  --   humidity = {min = 0.2, max = 1},
+  --   color = {1, 1, 1, 1},
+  -- },
+  [900] = {
+    name = "deep ocean",
+    altitude = {min = -math.huge, max = -400},
+    temperature = {min = -math.huge, max = math.huge},
+    humidity = {min = -math.huge, max = math.huge},
+    color = {0, 0, 0.25, 1},
   },
-  [6] = {
+  [1000] = {
-    name = "beach",
+    name = "ocean (definition, 0 meters)",
-    altitude = {min = 0.2, max = 0.205}, -- just above ocean
+    altitude = {min = -math.huge, max = 0},
-    temperature = {min = 0, max = 1},
+    temperature = {min = -math.huge, max = math.huge},
-    humidity = {min = 0, max = 0.8}, -- excluding upper humidity for swamp
+    humidity = {min = -math.huge, max = math.huge},
-    color = {1, 1, 0.33, 1}, -- brighter yellow to distinguish from sand
+    color = {0, 0, 0.5, 1},
   },
-  [8] = {
+  [2000] = {
-    name = "swamp", -- fun idea, but generates between ocean and water too often?
+    name = "snowline (middle estimate)",
-    altitude = {min = 0, max = 1},
+    altitude = {min = 4000, max = math.huge},
-    temperature = {min = 0.5, max = 1},
+    temperature = {min = -math.huge, max = math.huge},
-    humidity = {min = 0.95, max = 1},
+    humidity = {min = -math.huge, max = math.huge},
-    color = {0, 0.5, 0.33, 1},
+    color = {1, 1, 1, 1},
   },
-  [10] = {
+  [2100] = {
-    name = "water",
+    name = "alpine zone",
-    altitude = {min = 0, max = 0.9}, -- top excluded because it should've gone downhill
+    altitude = {min = 3500, max = math.huge},
-    temperature = {min = 0.1, max = 0.9}, -- bottom should be ice, top should evaporate
+    temperature = {min = -math.huge, max = math.huge},
-    humidity = {min = 0.8, max = 1}, -- only the wettest places
+    humidity = {min = -math.huge, max = math.huge},
-    color = {0, 0, 1, 1},
+    color = {0.8, 0.8, 0.8, 1},
   },
-  [20] = {
+  [2200] = {
-    name = "sand",
+    name = "subalpine zone",
-    altitude = {min = 0.2, max = 0.9}, -- top falls down, bottom is underwater
+    altitude = {min = 3000, max = math.huge},
-    temperature = {min = 0, max = 1},
+    temperature = {min = -math.huge, max = math.huge},
-    humidity = {min = 0, max = 0.2}, -- only where dry makes more sense for a desert
+    humidity = {min = -math.huge, max = math.huge},
-    color = {1, 1, 0, 1},
-  },
-  [30] = {
-    name = "grass",
-    altitude = {min = 0.3, max = 0.9}, -- top of the world not enough air, bottom too wet / leaving space for others
-    temperature = {min = 0.2, max = 0.8}, -- not very sensitive to temperature
-    humidity = {min = 0.2, max = 0.6}, -- not very sensitive to humidity; but excluded from the worst
-    color = {0, 1, 0, 1},
-  },
-  [40] = {
-    name = "trees",
-    altitude = {min = 0.4, max = 0.7}, -- more sensitive than grass
-    temperature = {min = 0, max = 0.7},
-    humidity = {min = 0.3, max = 0.8}, -- these are not desert trees, they need more water
-    color = {0, 0.67, 0, 1},
-  },
-  [60] = {
-    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},
   },
-  [50] = {
+  [2300] = {
-    name = "ice",
+    name = "montane zone",
-    altitude = {min = 0, max = 1},
+    altitude = {min = 2500, max = math.huge},
-    temperature = {min = 0, max = 0.01},
+    temperature = {min = -math.huge, max = math.huge},
-    humidity = {min = 0.2, max = 1},
+    humidity = {min = -math.huge, max = math.huge},
-    color = {1, 1, 1, 1},
+    color = {0.67, 0.67, 0.5, 1},
   },
 }
 
 love.load = function()
   map.size = 500
   map.tile_size = 1
-  map.altitude = heightmap.create(map.size, map.size, 0, 1)
+  map.altitude = heightmap.create(map.size, map.size, -440, 8849) -- meters
-  map.temperature = heightmap.create(map.size, map.size, 0, 1)
+  map.temperature = heightmap.create(map.size, map.size, -89.2, 56.7) -- celsius
-  map.humidity = heightmap.create(map.size, map.size, 0, 1)
+  map.humidity = heightmap.create(map.size, map.size, 18, 3240) -- millimeters rainfall
+
+  local function altitude_ocean_bias(altitude)
+    local bias = 3.5 -- higher -> more ocean
+    local normalized_altitude = (altitude - -400) / (8849 - -440)
+    return -440 + normalized_altitude^bias * (8849 - -440)
+  end
+  local min, max = math.huge, -math.huge
+  for x = 0, map.size do
+    for y = 0, map.size do
+      local value = altitude_ocean_bias(map.altitude[x][y])
+      if value > max then max = value end
+      if value < min then min = value end
+      map.altitude[x][y] = value
+    end
+  end
+  print("Altitude", "Min: ", min, "Max:", max)
 
   -- if true then return end
 
   -- lower temperature by half height
   -- NOTE ruins "normalization" but that's fine once we have "real" numbers to work with
-  for x = 0, map.temperature.w do
+  -- for x = 0, map.temperature.w do
-    for y = 0, map.temperature.h do
+  --   for y = 0, map.temperature.h do
-      map.temperature[x][y] = math.max(0, map.temperature[x][y] - map.altitude[x][y] / 2)
+  --     map.temperature[x][y] = math.max(0, map.temperature[x][y] - map.altitude[x][y] / 2)
-    end
+  --   end
-  end
+  -- end
-  heightmap.normalize(map.temperature, 0, 1)
+  -- heightmap.normalize(map.temperature, -89.2, 56.7)
 
   -- modify temperature by latitude
   -- TODO would be more efficient to calculate Y in outer loop, since X does not change the distance
   -- NOTE only subtracts temperature, which further "ruins normalization" and makes everything too cold:
-  local center_y = map.size / 2
+  -- local center_y = map.size / 2
-  for x = 0, map.temperature.w do
+  -- for x = 0, map.temperature.w do
-    for y = 0, map.temperature.h do
+  --   for y = 0, map.temperature.h do
-      local distance = math.abs(y - center_y)
+  --     local distance = math.abs(y - center_y)
-      map.temperature[x][y] = lume.clamp(map.temperature[x][y] - distance / map.size, 0, 1)
+  --     map.temperature[x][y] = lume.clamp(map.temperature[x][y] - distance / map.size, 0, 1)
-    end
+  --   end
-  end
+  -- end
-  heightmap.normalize(map.temperature, 0, 1)
+  -- heightmap.normalize(map.temperature, -89.2, 56.7)
 
   -- increase humidity by half temperature
-  for x = 0, map.humidity.w do
+  -- for x = 0, map.humidity.w do
-    for y = 0, map.humidity.h do
+  --   for y = 0, map.humidity.h do
-      map.humidity[x][y] = math.min(1, map.humidity[x][y] + map.temperature[x][y] / 2)
+  --     map.humidity[x][y] = math.min(1, map.humidity[x][y] + map.temperature[x][y] / 2)
-    end
+  --   end
-  end
+  -- end
+  -- heightmap.normalize(map.humidity, 18, 3240)
 
   -- planetizer!
   local biome_order = {}