Add multiple ball colors, and increased a bit ball maxspeed.

Idea and textures due to user Xiug. Thanks goes to him.
Also added contributors to the README.

README.txt

@@ -15,3 +15,10 @@ right-click. You can take it again by punching it.
 You can push the ball by standing near it, and kick it by holding the "sneak"
 key (by default "Shift"). The ball will get pushed/kicked in the direction the
 player is facing (you can center-on the ball by looking up).
+
+
+Special thanks
+--------------
+- 12Me21: Ideas about the crafting recipe.
+- ecube: Original (black) texture.
+- Xiug: Ideas and textures.

init.lua

@@ -1,14 +1,22 @@
 
 local BALL_PUSH_CHECK_INTERVAL = 0.1
 
-minetest.register_entity("soccer:ball", {
+local function reg_ball(color)
+
+	local ball_item_name = "soccer:ball_"..color.."_item"
+	local ball_ent_name = "soccer:ball_"..color.."_entity"
+
+	minetest.register_entity(ball_ent_name, {
 		physical = true,
 		visual = "mesh",
 		mesh = "soccer_ball.x",
 		hp_max = 1000,
 		groups = { immortal = true },
-	textures = { "soccer_ball.png" },
+		textures = { "soccer_ball_"..color..".png" },
 		collisionbox = { -0.2, -0.2, -0.2, 0.2, 0.2, 0.2 },
+
+		timer = 0,
+
 		on_step = function(self, dtime)
 			self.timer = self.timer + dtime
 			if self.timer >= BALL_PUSH_CHECK_INTERVAL then
@@ -18,9 +26,9 @@ minetest.register_entity("soccer:ball", {
 				local p = self.object:getpos();
 				p.y = p.y - 0.5
 				if minetest.registered_nodes[minetest.env:get_node(p).name].walkable then
-				vel.x = vel.x * 0.80
+					vel.x = vel.x * 0.85
-				if vel.y < 0 then vel.y = vel.y * -0.50 end
+					if vel.y < 0 then vel.y = vel.y * -0.65 end
-				vel.z = vel.z * 0.80
+					vel.z = vel.z * 0.90
 				end
 				if  (math.abs(vel.x) < 0.1)
 				 and (math.abs(vel.z) < 0.1) then
@@ -53,13 +61,15 @@ minetest.register_entity("soccer:ball", {
 				end
 			end
 		end,
+
 		on_punch = function(self, puncher)
 			if puncher and puncher:is_player() then
 				local inv = puncher:get_inventory()
-			inv:add_item("main", ItemStack("soccer:ball_item"))
+				inv:add_item("main", ItemStack(ball_item_name))
 				self.object:remove()
 			end
 		end,
+
 		is_moving = function(self)
 			local v = self.object:getvelocity()
 			if  (math.abs(v.x) <= 0.1)
@@ -71,21 +81,40 @@ minetest.register_entity("soccer:ball", {
 			end
 			return true
 		end,
-	timer = 0,
+	})
-})
+
+	minetest.register_craftitem(ball_item_name, {
+		description = "Soccer Ball ("..color..")",
+		inventory_image = "soccer_ball_"..color.."_inv.png",
 
-minetest.register_craftitem("soccer:ball_item", {
-	description = "Soccer Ball",
-	inventory_image = "soccer_ball_inv.png",
 		on_place = function(itemstack, placer, pointed_thing)
 			local pos = pointed_thing.above
 			--pos = { x=pos.x+0.5, y=pos.y, z=pos.z+0.5 }
-		local ent = minetest.env:add_entity(pos, "soccer:ball")
+			local ent = minetest.env:add_entity(pos, ball_ent_name)
-		ent:setvelocity({x=0, y=-4, z=0})
+			ent:setvelocity({x=0, y=-15, z=0})
 			itemstack:take_item()
 			return itemstack
 		end,
-})
+	})
+
+	minetest.register_craft({
+		output = ball_item_name,
+		recipe = {
+			{ "", "wool:white", "" },
+			{ "wool:white", "wool:"..color, "wool:white" },
+			{ "", "wool:white", "" },
+		},
+	})
+
+end
+
+colors = {
+	"black", "red", "green", "blue", "yellow", "purple",
+}
+
+for _,color in ipairs(colors) do
+	reg_ball(color)
+end
 
 minetest.register_node("soccer:goal", {
 	description = "Soccer Goal",
@@ -147,13 +176,4 @@ reg_decal("line_d", "Diagonal Line")
 reg_decal("line_point", "Point")
 reg_decal("line_corner", "Corner")
 
-minetest.register_craft({
+minetest.register_alias("ball", "soccer:ball_item_black")
-	output = "soccer:ball_item",
-	recipe = {
-		{ "", "wool:white", "" },
-		{ "wool:white", "default:coal_lump", "wool:white" },
-		{ "", "wool:white", "" },
-	},
-})
-
-minetest.register_alias("ball", "soccer:ball_item")