added parachutes!

mods/parachute/README.txt

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+Parachute mod
+=============
+By webdesigner97
+Tewaked by Kaadmy, for Pixture
+
+Model license: WTFPL
+Texture license: WTFPL
+Source license: WTFPL

mods/parachute/depends.txt

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+default

mods/parachute/init.lua

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+--
+-- Parachute mod
+-- By webdesigner97(No license?)
+-- Tweaked by Kaadmy, for Pixture
+--
+
+function a(v)
+   local m = 80    -- Weight of player, kg
+   local g = -9.81 -- Earth Acceleration, m/s^2
+   local cw = 1.33 -- Drag coefficient
+   local rho = 1.2 -- Density of air (on ground, not accurate), kg/m^3
+   local A = 25    -- Surface of the parachute, m^2
+
+   return ((m * g + 0.5 * cw * rho * A * v * v) / m)
+end
+
+minetest.register_craftitem(
+   "parachute:parachute", {
+      inventory_image = "parachute_inventory.png",
+      wield_image = "parachute_inventory.png",
+      on_use = function(itemstack, player, pointed_thing)
+		  local pos = player:getpos()
+
+		  local on = minetest.get_node({x = pos.x, y = pos.y - 1, z = pos.z})
+
+		  if on.name == "air" then
+		     -- Spawn parachute
+		     pos.y = pos.y + 3
+
+		     local ent = minetest.add_entity(pos, "parachute:entity")
+
+		     ent:setvelocity({x = 0, y = player:get_player_velocity().y, z = 0})
+
+		     player:set_attach(ent, "", {x = 0, y = -8, z = 0}, {x = 0, y = 0, z = 0})
+
+		     ent:setyaw(player:get_look_yaw() - (math.pi / 2))
+		     ent = ent:get_luaentity()
+		     ent.attached = player
+
+		     itemstack:take_item()
+		     return itemstack
+		  else
+		     minetest.chat_send_player(
+			player:get_player_name(),
+			"Cannot open parachute on ground!")
+		  end
+	       end
+   })
+
+minetest.register_entity(
+   "parachute:entity",
+   {
+      visual = "mesh",
+      mesh = "parachute.b3d",
+      textures = {"parachute_mesh.png"},
+      collisionbox = {0, 0, 0, 0, 0, 0},
+      automatic_face_movement_dir = -90,
+      attached = nil,
+      on_step = function(self, dtime)
+		   if self.attached ~= nil then
+		      local vel = self.object:getvelocity()
+
+		      local accel = {x = 0, y = 0, z = 0}
+
+		      local lookyaw = self.attached:get_look_yaw()
+
+		      local s = math.sin((math.pi * 0.5) - lookyaw)
+		      local c = math.cos((math.pi * 0.5) - lookyaw)
+
+		      local sr = math.sin(((math.pi * 0.5) - lookyaw) + (math.pi / 2))
+		      local cr = math.cos(((math.pi * 0.5) - lookyaw) + (math.pi / 2))
+
+		      local controls = self.attached:get_player_control()
+
+		      local speed = 3.0
+
+		      if controls.up then
+			 accel.x = s * speed
+			 accel.z = c * speed
+		      elseif controls.down then
+			 accel.x = s * -speed
+			 accel.z = c * -speed
+		      end
+
+		      if controls.right then
+			 accel.x = sr * speed
+			 accel.z = cr * speed
+		      elseif controls.left then
+			 accel.x = sr * -speed
+			 accel.z = cr * -speed
+		      end
+
+		      accel.y = accel.y + a(vel.y) * 0.25
+
+		      self.object:setacceleration(accel)
+		   end
+
+		   local pos = self.object:getpos()
+		   local under = minetest.get_node({x = pos.x, y = pos.y - 1, z = pos.z})
+		   if under.name ~= "air" then
+		      self.object:set_detach()
+		      self.object:remove()
+		   end
+		end
+   })
+
+minetest.register_craft(
+   {
+      output = "parachute:parachute",
+      recipe = {
+	 {"group:fuzzy", "group:fuzzy", "group:fuzzy"},
+	 {"default:rope", "", "default:rope"},
+	 {"", "default:stick", ""}
+      }
+   })
+
+default.log("mod:parachute", "loaded")