1 -- Hangglider mod for Minetest
2 -- Original code by Piezo_ (orderofthefourthwall@gmail.com)
5 -- Modifications by David G (kestral246@gmail.com)
7 -- For Minetest 5.x, glider's set_attach needs to be offset by 1 node
8 -- Switch to alternate commented line below with correct offset.
9 -- Additional tuning of parameters.
10 -- Commented out debug hud display code, prefixed with "--debug:".
13 -- Give visual indication that hangglider is equiped.
14 -- Display simple overlay with blurred struts when equiped.
15 -- Issue: don't know how to disable overlay in third person view.
16 -- Also Unequip hangglider when landing on water.
17 -- Attempt to linearize parabolic flight path.
18 -- Start gravity stronger, but gradually reduce it as descent velocity increases.
19 -- Don't use airstopper when equipped from the ground (descent velocity is low).
20 -- Slightly increase flight speed to 1.25.
21 -- Unequip/equip cycling mid-flight should not fly farther than continuous flight.
22 -- When equipping mid-air (descent velocity higher), use airstopper but increase descent slope afterwards.
23 -- Create airbreak flag so all equips mid-flight use faster descent.
24 -- Reset airbreak flag only when land (canExist goes false).
25 -- Issue: it wouldn't reset if land in water, use fly, and launch from air, before I added test for water,
26 -- not sure if there are other such cases.
27 -- Temporarily add hud debug display to show descent velocity, gravity override, and airbreak flag.
28 -- Still in process of tuning all the parameters.
31 -- Modifications by Piezo_
33 -- hud overlay and debug can be enabled/disabled
34 -- Added blender-rendered overlay for struts using the actual model.
35 -- Reduced airbreak penalty severity
36 -- gave glider limited durability.
37 -- Improved gravity adjustment function.
38 -- Changed airbreaking process
39 -- Removed airbreak penalty, as any 'advantage' seems minimal after new adjustments
40 -- Removed airbreak until minetest devs are smart enough to implement better serverside players.
41 -- Simplified liquid check.
43 -- Modifications by gpcf
45 -- get shot down while flying over protected areas marked as no-fly-zones (flak, from German Flugabwehrkanone)
46 -- set these areas with the /area_flak command
50 local HUD_Overlay = true --show glider struts as overlay on HUD
51 local debug = false --show debug info in top-center of hud
52 local moveModelUp = false
53 if tonumber(string.sub(minetest.get_version().string, 1, 1)) and tonumber(string.sub(minetest.get_version().string, 1, 1)) > 4 then
56 hangglider = {} --Make this global, so other mods can tell if hangglider exists.
59 hangglider.id = {} -- hud id for displaying overlay with struts
61 if debug then hangglider.debug = {} end -- hud id for debug data
62 --hangglider.airbreak = {} -- true if falling fast when equip
64 minetest.register_entity("hangglider:airstopper", { --A one-instant entity that catches the player and stops them.
69 on_step = function(self, _)
70 local canExist = false
72 local player = self.attach
73 if player:is_player() then
74 local pname = player:get_player_name()
76 if player:get_player_velocity().y < 0.5 and player:get_player_velocity().y > -0.5 then
77 --Let go when the player actually stops, as that's the whole point.
78 if hangglider.use[pname] then
80 minetest.add_entity(player:get_pos(), "hangglider:glider"):set_attach(player, "", {x=0,y=10,z=0}, {x=0,y=0,z=0})
82 minetest.add_entity(player:get_pos(), "hangglider:glider"):set_attach(player, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
99 hangglider.flak = true
100 -- chat command definition essentially copied from areas mod.
101 minetest.register_chatcommand("area_flak",{
103 description = "Toggle airspace restrictions for area <ID>",
104 func = function(name, param)
105 local id = tonumber(param)
107 return false, "Invalid usage, see /help area_flak."
110 if not areas:isAreaOwner(id, name) then
111 return false, "Area "..id.." does not exist"
112 .." or is not owned by you."
114 local open = not areas.areas[id].flak
115 -- Save false as nil to avoid inflating the DB.
116 areas.areas[id].flak = open or nil
118 return true, ("Area's airspace %s."):format(open and "closed" or "opened")
123 if minetestd and minetestd.services.gravityctl.enabled then
124 minetestd.gravityctl.register_gravity_effect("hangglider",
126 return hangglider.use[player:get_player_name()]
128 function(gravity, player)
129 local vel = player:get_player_velocity()
130 if debug then player:hud_change(hangglider.debug[pname].id, "text", vel.y..', '..player:get_physics_override().gravity..', '..tostring(hangglider.airbreak[pname])) end
131 return ((vel.y + 3)/20)
138 hangglider.can_fly = function (pname, pos)
139 -- Checks if the player will get shot down at the position
140 if minetest.is_protected(vector.round(pos), pname) then
141 if hangglider.flak then
142 for id, area in pairs(areas:getAreasAtPos(pos)) do
152 hangglider.shot_sound = function (pos)
153 minetest.sound_play("hangglider_flak_shot", {
155 max_hear_distance = 30,
161 minetest.register_entity("hangglider:glider", {
163 visual_size = {x = 12, y = 12},
167 textures = {"wool_white.png","default_wood.png"},
168 on_step = function(self, dtime)
169 local canExist = false
170 if self.object:get_attach() then
171 local player = self.object:get_attach("parent")
173 local pos = player:getpos()
174 local pname = player:get_player_name()
175 if hangglider.use[pname] then
176 local mrn_name = minetest.registered_nodes[minetest.get_node(vector.new(pos.x, pos.y-0.5, pos.z)).name]
178 if not (mrn_name.walkable or mrn_name.liquidtype ~= "none") then
180 step_v = player:get_player_velocity().y
181 if step_v < 0 and step_v > -3 then
182 player:set_physics_override({speed=math.abs(step_v/2) + 0.75})
183 elseif step_v <= -3 then --Cap our gliding movement speed.
184 player:set_physics_override({speed=2.25})
186 player:set_physics_override({speed=1})
188 if not minetestd then
189 if debug then player:hud_change(hangglider.debug[pname].id, "text", step_v..', '..player:get_physics_override().gravity..', '..tostring(hangglider.airbreak[pname])) end
190 player:set_physics_override({gravity=((step_v + 3)/20)})
192 --[[local vel = player:get_player_velocity()
193 if debug then player:hud_change(hangglider.debug[pname].id, "text", vel.y..', '..grav..', '..tostring(hangglider.airbreak[pname])) end
195 player:set_physics_override({gravity = (vel.y + 2.0)/20})
199 if not hangglider.can_fly(pname,pos) then
200 if not self.warned then -- warning shot
202 hangglider.shot_sound(pos)
203 minetest.chat_send_player(pname, "Protected area! You will be shot down in two seconds by anti-aircraft guns!")
205 self.warned = self.warned + dtime
206 if self.warned > 2 then -- shoot down
208 player:get_inventory():remove_item("main", ItemStack("hangglider:hangglider"))
209 hangglider.shot_sound(pos)
214 player:set_physics_override({
218 if not minetestd then
219 player:set_physics_override({gravity=1})
221 hangglider.use[pname] = false
223 player:hud_change(hangglider.id[pname], "text", "blank.png")
225 --hangglider.airbreak[pname] = false
230 self.object:set_detach()
236 minetest.register_on_dieplayer(function(player)
237 player:set_physics_override({
241 hangglider.use[player:get_player_name()] = false
245 minetest.register_on_joinplayer(function(player)
246 local pname = player:get_player_name()
247 player:set_physics_override({
251 hangglider.use[pname] = false
253 hangglider.id[pname] = player:hud_add({
254 hud_elem_type = "image",
256 position = {x=0, y=0},
257 scale = {x=-100, y=-100},
258 alignment = {x=1, y=1},
262 hangglider.debug[pname] = {id = player:hud_add({hud_elem_type = "text",
263 position = {x=0.5, y=0.1},
265 number = 0xFF0000}), -- red text
269 --hangglider.airbreak[pname] = false
272 minetest.register_on_leaveplayer(function(player)
273 local pname = player:get_player_name()
274 hangglider.use[pname] = nil
275 if HUD_Overlay then hangglider.id[pname] = nil end
276 if debug then hangglider.debug[pname] = nil end
277 --hangglider.airbreak[pname] = nil
280 minetest.register_tool("hangglider:hangglider", {
281 description = "Glider",
282 inventory_image = "glider_item.png",
284 on_use = function(itemstack, player, pointed_thing)
288 local pos = player:get_pos()
289 local pname = player:get_player_name()
290 if minetest.get_node(pos).name == "air" and not hangglider.use[pname] then --Equip
291 minetest.sound_play("bedsheet", {pos=pos, max_hear_distance = 8, gain = 1.0})
292 if HUD_Overlay then player:hud_change(hangglider.id[pname], "text", "glider_struts.png") end
293 local airbreak = false
294 local vel = player:get_player_velocity().y
295 --[[if vel < -1.5 then -- engage mid-air, falling fast, so stop but ramp velocity more quickly
296 --hangglider.airbreak[pname] = true
298 local stopper = minetest.add_entity(pos, "hangglider:airstopper")
299 minetest.after(0, function(stopper, player) --"Extreme Measures"
300 stopper:set_pos(player:get_pos())
301 stopper:get_luaentity().attach = player
302 player:set_attach( stopper, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
303 end, stopper, player)
307 minetest.add_entity(pos, "hangglider:glider"):set_attach(player, "", {x=0,y=10,z=0}, {x=0,y=0,z=0})
309 minetest.add_entity(pos, "hangglider:glider"):set_attach(player, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
312 hangglider.use[pname] = true
313 player:set_physics_override({jump = 0})
314 -- if minetest 0.4.x use this:
316 -- if minetest 5.x use this:
317 -- minetest.add_entity(player:get_pos(), "hangglider:glider"):set_attach(player, "", {x=0,y=10,z=0}, {x=0,y=0,z=0})
318 itemstack:set_wear(itemstack:get_wear() + 255)
320 elseif hangglider.use[pname] then --Unequip
321 if HUD_Overlay then player:hud_change(hangglider.id[pname], "text", "default_wood.png^[colorize:#0000:255") end
322 hangglider.use[pname] = false
325 sound = {breaks = "default_tool_breaks"},
328 minetest.register_craft({
330 output = "hangglider:hangglider",
331 recipe = {"default:paper", "default:paper", "default:paper", "default:paper", "hangglider:hangglider", "default:paper", "default:paper", "default:paper", "default:paper"},
334 minetest.register_craft({
335 output = "hangglider:hangglider",
337 {"wool:white", "wool:white", "wool:white"},
338 {"default:stick", "", "default:stick"},
339 {"", "default:stick", ""},