Generate all mapcolors

item.lua

@@ -30,7 +30,8 @@ for i = 0, nodecore.hard_stone_strata do
 			drop_in_place = modname .. ((i > 1)
 				and (":ore_" .. (i - 1)) or (i > 0) and ":ore" or ":cobble"),
 			strata = strata,
-			silktouch = false
+			silktouch = false,
+			mapcolor = {r = 69, g = 58, b = 53},
 		})
 end
 
@@ -54,7 +55,8 @@ minetest.register_node(modname .. ":cobble", {
 			},
 			sounds = nodecore.sounds("nc_terrain_chompy")
 		},
-		sounds = nodecore.sounds("nc_terrain_stony")
+		sounds = nodecore.sounds("nc_terrain_stony"),
+		mapcolor = {r = 62, g = 52, b = 59},
 	})
 
 minetest.register_node(modname .. ":egg", {
@@ -77,7 +79,8 @@ minetest.register_node(modname .. ":egg", {
 		},
 		stack_max = 1,
 		on_place = minetest.rotate_and_place,
-		sounds = nodecore.sounds("nc_terrain_stony")
+		sounds = nodecore.sounds("nc_terrain_stony"),
+		mapcolor = {r = 81, g = 60, b = 54},
 	})
 
 minetest.register_craftitem(modname .. ":prill", {

nodeapi.lua

@@ -1,8 +1,10 @@
 -- LUALOCALS < ---------------------------------------------------------
-local ipairs, math, minetest, nodecore, pairs, string, type, vector
-    = ipairs, math, minetest, nodecore, pairs, string, type, vector
-local math_random, string_gsub, string_lower
-    = math.random, string.gsub, string.lower
+local ipairs, math, minetest, nodecore, pairs, string, tonumber, type,
+      vector
+    = ipairs, math, minetest, nodecore, pairs, string, tonumber, type,
+      vector
+local math_random, string_gsub, string_lower, string_sub
+    = math.random, string.gsub, string.lower, string.sub
 -- LUALOCALS > ---------------------------------------------------------
 
 local modname = minetest.get_current_modname()
@@ -238,12 +240,22 @@ function myapi.register_cat(desc, basetiles, basedef, overlays)
 			}, basedef))
 end
 
-function myapi.register_cat_spots(id, base, spot, ...)
+function myapi.register_cat_spots(id, base, spot, basedef, ...)
 	local txr = "nc_cats_base.png^[multiply:" .. base
 	if base ~= spot then
 		txr = txr .. "^(nc_cats_spots.png^[multiply:" .. spot .. ")"
 	end
-	return myapi.register_cat(id, {txr}, ...)
+	basedef = nodecore.underride(basedef or {}, {
+			mapcolor = {
+				r = (tonumber(string_sub(base, 2, 3), 16)
+					+ tonumber(string_sub(spot, 2, 3), 16)) / 2,
+				g = (tonumber(string_sub(base, 4, 5), 16)
+					+ tonumber(string_sub(spot, 4, 5), 16)) / 2,
+				b = (tonumber(string_sub(base, 6, 7), 16)
+					+ tonumber(string_sub(spot, 6, 7), 16)) / 2,
+			}
+		})
+	return myapi.register_cat(id, {txr}, basedef, ...)
 end
 
 function myapi.makecat(pos, param2, creator)

nodedefs.lua

@@ -75,6 +75,7 @@ do
 				end
 				return qty >= total and 1 or 0
 			end,
-			groups = {[modname .. "_rainbow"] = 1}
+			groups = {[modname .. "_rainbow"] = 1},
+			mapcolor = {r = 147, g = 55, b = 225}
 		})
 end