mods/parachute/init.lua

   1
   2 --
   3 -- Parachute mod
   4 -- By webdesigner97(No license?)
   5 -- Tweaked by Kaadmy, for Pixture
   6 --
   7
   8 function air_physics(v)
   9    local m = 80    -- Weight of player, kg
  10    local g = -9.81 -- Earth Acceleration, m/s^2
  11    local cw = 1.25 -- Drag coefficient
  12    local rho = 1.2 -- Density of air (on ground, not accurate), kg/m^3
  13    local A = 25    -- Surface of the parachute, m^2
  14
  15    return ((m * g + 0.5 * cw * rho * A * v * v) / m)
  16 end
  17
  18 minetest.register_craftitem(
  19    "parachute:parachute", {
  20       description = "Parachute",
  21       inventory_image = "parachute_inventory.png",
  22       wield_image = "parachute_inventory.png",
  23       stack_max = 1,
  24       on_use = function(itemstack, player, pointed_thing)
  25          local name = player:get_player_name()
  26
  27          local pos = player:getpos()
  28
  29          local on = minetest.get_node({x = pos.x, y = pos.y - 1, z = pos.z})
  30
  31          if default.player_attached[name] then
  32             return
  33          end
  34
  35          if on.name == "air" then
  36             -- Spawn parachute
  37             pos.y = pos.y + 3
  38
  39             local ent = minetest.add_entity(pos, "parachute:entity")
  40
  41             ent:setvelocity(
  42                {
  43                   x = 0,
  44                   y = math.min(0, player:get_player_velocity().y),
  45                   z = 0
  46             })
  47
  48             player:set_attach(ent, "", {x = 0, y = -8, z = 0}, {x = 0, y = 0, z = 0})
  49
  50             ent:setyaw(player:get_look_horizontal())
  51
  52             ent = ent:get_luaentity()
  53             ent.attached = name
  54
  55             default.player_attached[player:get_player_name()] = true
  56
  57             itemstack:take_item()
  58
  59             return itemstack
  60          else
  61             minetest.chat_send_player(
  62                player:get_player_name(),
  63                "Cannot open parachute on ground!")
  64          end
  65       end
  66 })
  67
  68 minetest.register_entity(
  69    "parachute:entity",
  70    {
  71       visual = "mesh",
  72       mesh = "parachute.b3d",
  73       textures = {"parachute_mesh.png"},
  74       collisionbox = {0, 0, 0, 0, 0, 0},
  75       automatic_face_movement_dir = -90,
  76       attached = nil,
  77       on_step = function(self, dtime)
  78          local pos = self.object:getpos()
  79          local under = minetest.get_node({x = pos.x, y = pos.y - 1, z = pos.z})
  80
  81          if self.attached ~= nil then
  82             local player = minetest.get_player_by_name(self.attached)
  83
  84             local vel = self.object:getvelocity()
  85
  86             local accel = {x = 0, y = 0, z = 0}
  87
  88             local lookyaw = math.pi - player:get_look_horizontal()
  89
  90             if lookyaw < 0 then
  91                lookyaw = lookyaw + (math.pi * 2)
  92             end
  93
  94             if lookyaw >= (math.pi * 2) then
  95                lookyaw = lookyaw - (math.pi * 2)
  96             end
  97 --            self.object:setyaw(lookyaw)
  98
  99             local s = math.sin(lookyaw)
 100             local c = math.cos(lookyaw)
 101
 102             local sr = math.sin(lookyaw - (math.pi / 2))
 103             local cr = math.cos(lookyaw - (math.pi / 2))
 104
 105             local controls = player:get_player_control()
 106
 107             local speed = 4.0
 108
 109             if controls.down then
 110                accel.x = s * speed
 111                accel.z = c * speed
 112             elseif controls.up then
 113                accel.x = s * -speed
 114                accel.z = c * -speed
 115             end
 116
 117             if controls.right then
 118                accel.x = sr * speed
 119                accel.z = cr * speed
 120             elseif controls.left then
 121                accel.x = sr * -speed
 122                accel.z = cr * -speed
 123             end
 124
 125             accel.y = accel.y + air_physics(vel.y) * 0.25
 126
 127             self.object:setacceleration(accel)
 128
 129             if under.name ~= "air" then
 130                default.player_attached[self.attached] = false
 131             end
 132          end
 133
 134          if under.name ~= "air" then
 135             if self.attached ~= nil then
 136                default.player_attached[self.attached] = false
 137
 138                self.object:set_detach()
 139             end
 140
 141             self.object:remove()
 142          end
 143       end
 144 })
 145
 146 -- Crafting
 147
 148 crafting.register_craft(
 149    {
 150       output = "parachute:parachute",
 151       items = {
 152          "group:fuzzy 3",
 153          "default:rope 4",
 154          "default:stick 6",
 155       }
 156 })
 157
 158 -- Achievements
 159
 160 achievements.register_achievement(
 161    "sky_diver",
 162    {
 163       title = "Sky Diver",
 164       description = "Craft 5 parachutes.",
 165       times = 5,
 166       craftitem = "parachute:parachute",
 167 })
 168
 169 default.log("mod:parachute", "loaded")