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
42 local HUD_Overlay = true --show glider struts as overlay on HUD
43 local debug = false --show debug info in top-center of hud
44 hangglider = {} --Make this global, so other mods can tell if hangglider exists.
47 hangglider.id = {} -- hud id for displaying overlay with struts
49 if debug then hangglider.debug = {} end -- hud id for debug data
50 --hangglider.airbreak = {} -- true if falling fast when equip
52 minetest.register_entity("hangglider:airstopper", { --A one-instant entity that catches the player and stops them.
57 on_step = function(self, _)
58 local canExist = false
60 local player = self.attach
61 if player:is_player() then
62 local pname = player:get_player_name()
64 if player:get_player_velocity().y < 0.5 and player:get_player_velocity().y > -0.5 then
65 --Let go when the player actually stops, as that's the whole point.
66 if hangglider.use[pname] then
67 minetest.add_entity(player:get_pos(), "hangglider:glider"):set_attach(player, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
73 self.attach:set_detach()
82 minetest.register_entity("hangglider:glider", {
84 visual_size = {x = 12, y = 12},
88 textures = {"wool_white.png","default_wood.png"},
89 on_step = function(self, _)
90 local canExist = false
91 if self.object:get_attach() then
92 local player = self.object:get_attach("parent")
94 local pos = player:getpos()
95 local pname = player:get_player_name()
96 if hangglider.use[pname] then
97 local mrn_name = minetest.registered_nodes[minetest.get_node(vector.new(pos.x, pos.y-0.5, pos.z)).name]
99 if not (mrn_name.walkable or (mrn_name.drowning and mrn_name.drowning == 1)) then
101 local vel = player:get_player_velocity()
102 if debug then player:hud_change(hangglider.debug[pname].id, "text", vel.y..', '..grav..', '..tostring(hangglider.airbreak[pname])) end
104 player:set_physics_override({gravity = (vel.y + 2.0)/20})
109 player:set_physics_override({
114 hangglider.use[pname] = false
116 player:hud_change(hangglider.id[pname], "text", "blank.png")
118 --hangglider.airbreak[pname] = false
123 self.object:set_detach()
129 minetest.register_on_dieplayer(function(player)
130 player:set_physics_override({
134 hangglider.use[player:get_player_name()] = false
138 minetest.register_on_joinplayer(function(player)
139 local pname = player:get_player_name()
140 player:set_physics_override({
144 hangglider.use[pname] = false
146 hangglider.id[pname] = player:hud_add({
147 hud_elem_type = "image",
149 position = {x=0, y=0},
150 scale = {x=-100, y=-100},
151 alignment = {x=1, y=1},
155 hangglider.debug[pname] = {id = player:hud_add({hud_elem_type = "text",
156 position = {x=0.5, y=0.1},
158 number = 0xFF0000}), -- red text
162 --hangglider.airbreak[pname] = false
165 minetest.register_on_leaveplayer(function(player)
166 local pname = player:get_player_name()
167 hangglider.use[pname] = nil
168 if HUD_Overlay then hangglider.id[pname] = nil end
169 if debug then hangglider.debug[pname] = nil end
170 --hangglider.airbreak[pname] = nil
173 minetest.register_tool("hangglider:hangglider", {
174 description = "Glider",
175 inventory_image = "glider_item.png",
177 on_use = function(itemstack, user, pointed_thing)
181 local pos = user:get_pos()
182 local pname = user:get_player_name()
183 if minetest.get_node(pos).name == "air" and not hangglider.use[pname] then --Equip
184 minetest.sound_play("bedsheet", {pos=pos, max_hear_distance = 8, gain = 1.0})
185 if HUD_Overlay then user:hud_change(hangglider.id[pname], "text", "glider_struts.png") end
186 local airbreak = false
187 local vel = user:get_player_velocity().y
188 if vel < -1.5 then -- engage mid-air, falling fast, so stop but ramp velocity more quickly
189 --hangglider.airbreak[pname] = true
191 local stopper = minetest.add_entity(pos, "hangglider:airstopper")
192 stopper:get_luaentity().attach = user
193 user:set_attach( stopper, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
195 user:set_physics_override({gravity = 0,jump=0,speed=1.75})
198 minetest.add_entity(user:get_pos(), "hangglider:glider"):set_attach(user, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
200 hangglider.use[pname] = true
201 -- if minetest 0.4.x use this:
203 -- if minetest 5.x use this:
204 -- minetest.add_entity(user:get_pos(), "hangglider:glider"):set_attach(user, "", {x=0,y=10,z=0}, {x=0,y=0,z=0})
205 itemstack:set_wear(itemstack:get_wear() + 255)
207 elseif hangglider.use[pname] then --Unequip
208 if HUD_Overlay then user:hud_change(hangglider.id[pname], "text", "blank.png") end
209 hangglider.use[pname] = false
212 sound = {breaks = "default_tool_breaks"},
215 minetest.register_craft({
216 output = "hangglider:hangglider",
218 {"wool:white", "wool:white", "wool:white"},
219 {"default:stick", "", "default:stick"},
220 {"", "default:stick", ""},