Add "windmill" mod.

mods/buildings/windmill/README.md

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+
+
+This works only with latest git of Minetest (ass of 16.10.13).
+With older versions, you'll only see a one node large rotor.
+
+Crafting: MATERIAL     -nothing-  MATERIAL   
+                         stick               
+          MATERIAL     -nothing-  MATERIAL   
+
+With MATERIAL beeing
+
+         steel ingot for 4-blade windmill
+	 homedecor plastic sheet for 3-blade turbine
+         white wool for historic windmill sails
+         wood for historic windmill without sails (rotates very slowly)
+         stick for us-style farm windmill
+
+Clockwise- and counterclockwise rotating rotors can be crafted into each other.
+
+
+The axis is mostly a decorative node to which you can attach your mill rotors.
+   
+Axis:     steel_ingot    stick    steel_ingot
+
+
+Liscences: for code (written by Sokomine): WTFPL (it's really only a demonstration)
+           for textures (created by VanessaE): WTFPL

mods/buildings/windmill/init.lua

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+
+
+windmill = {}
+
+windmill.register_windmill = function( nodename, descr, animation_png, animation_png_reverse, scale, inventory_image, animation_speed, craft_material, sel_radius )
+
+    minetest.register_node( nodename, {
+	description = descr.." (clockwise)",
+	drawtype = "signlike", 
+        visual_scale = scale,
+	tiles = {
+		{name=animation_png, animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=animation_speed}},
+	},
+	inventory_image = inventory_image.."^[transformFX",
+	wield_image     = inventory_image.."^[transformFX",
+	wield_scale = {x=1, y=1, z=1},
+	paramtype = "light",
+	paramtype2 = "wallmounted",
+	sunlight_propagates = true,
+	walkable = false,
+	light_source = 1, -- reflecting a bit of light might be expected
+	selection_box = {
+		type = "wallmounted",
+		wall_side   = {-0.4, -sel_radius, -sel_radius, -0.2, sel_radius, sel_radius},
+	},
+	groups = {choppy=2,dig_immediate=3,attached_node=1},
+	legacy_wallmounted = true,
+
+    })
+
+
+    -- this one rotates in the opposite direction than the first one
+    minetest.register_node( nodename.."_reverse", {
+	description = descr.." (counter-clockwise)",
+	drawtype = "signlike",
+        visual_scale = scale,
+	tiles = {
+		{name=animation_png_reverse, animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=animation_speed}},
+	},
+	inventory_image = inventory_image,
+	wield_image     = inventory_image,
+	wield_scale = {x=1, y=1, z=1},
+	paramtype = "light",
+	paramtype2 = "wallmounted",
+	sunlight_propagates = true,
+	walkable = false,
+	light_source = 1, -- reflecting a bit of light might be expected
+	selection_box = {
+		type = "wallmounted",
+		wall_side   = {-0.4, -sel_radius, -sel_radius, -0.2, sel_radius, sel_radius},
+	},
+	groups = {choppy=2,dig_immediate=3,attached_node=1},
+	legacy_wallmounted = true,
+
+    })
+
+    minetest.register_craft({
+        output = nodename.."_reverse",
+        recipe = {{ nodename }},
+    }) 
+
+    minetest.register_craft({
+        output = nodename,
+        recipe = {{ nodename.."_reverse" }},
+    })
+
+    minetest.register_craft({
+        output = nodename,
+        recipe = {
+                { craft_material,       "",                    craft_material },
+                { "",                   "default:stick",       "",             },
+                { craft_material,       "",                    craft_material },
+        }
+})
+end
+
+
+windmill.register_windmill( "windmill:windmill",       "Windmill rotors",
+			"windmill.png", "windmill_reverse.png",
+			6.0, "windmill_4blade_inv.png", 1.0, "default:steel_ingot", 2.9 );
+
+windmill.register_windmill( "windmill:windmill_modern", "Windmill turbine",
+			"windmill_3blade_cw.png", "windmill_3blade_ccw.png",
+			6.0, "windmill_3blade_inv.png", 1.0, "homedecor:plastic_sheeting", 2.9 );
+
+windmill.register_windmill( "windmill:windmill_sails", "Windmill sails",
+			"windmill_wooden_cw_with_sails.png", "windmill_wooden_ccw_with_sails.png",
+			6.0, "windmill_wooden_inv.png", 1.0, "wool:white", 3 );
+
+windmill.register_windmill( "windmill:windmill_idle",  "Windmill idle",
+			"windmill_wooden_cw.png", "windmill_wooden_ccw.png",
+			6.0, "windmill_wooden_no_sails_inv.png", 2.0, "default:wood", 3 );
+
+-- this one is smaller than the other ones
+windmill.register_windmill( "windmill:windmill_farm", "Windmill found on farms",
+			"windmill_farm_cw.png", "windmill_farm_ccw.png",
+			3.0, "windmill_farm_inv.png", 0.5, "default:stick", 1.5 );
+
+minetest.register_node("windmill:axis", {
+	description = "Axis for mounting windmills",
+	drawtype = "nodebox",
+	tiles = {"default_wood.png"},
+	paramtype = "light",
+	paramtype2 = "facedir",
+	sunlight_propagates = true,
+	groups = {choppy=2,dig_immediate=3},
+	node_box = {
+		type = "fixed",
+		fixed = {{-0.25, -0.5, -0.25, 0.25, 0.4, 0.25},
+			 {-0.1,-0.1,-0.5,0.1,0.1,0.5}},
+	},
+	selection_box = {
+		type = "fixed",
+		fixed = {{-0.25, -0.5, -0.25, 0.25, 0.4, 0.25},
+			 {-0.1,-0.1,-0.5,0.1,0.1,0.5}},
+	},
+})
+
+
+minetest.register_craft({
+        output = "windmill:axis",
+        recipe = {
+                {"default:steel_ingot", "default:stick",       "default:steel_ingot" },
+        }
+})