-- Hangglider mod for Minetest -- Original code by Piezo_ (orderofthefourthwall@gmail.com) -- 2018-11-14 -- Modifications by David G (kestral246@gmail.com) -- 2018-11-24 -- For Minetest 5.x, glider's set_attach needs to be offset by 1 node -- Switch to alternate commented line below with correct offset. -- Additional tuning of parameters. -- Commented out debug hud display code, prefixed with "--debug:". -- 2018-11-22 -- Give visual indication that hangglider is equiped. -- Display simple overlay with blurred struts when equiped. -- Issue: don't know how to disable overlay in third person view. -- Also Unequip hangglider when landing on water. -- Attempt to linearize parabolic flight path. -- Start gravity stronger, but gradually reduce it as descent velocity increases. -- Don't use airstopper when equipped from the ground (descent velocity is low). -- Slightly increase flight speed to 1.25. -- Unequip/equip cycling mid-flight should not fly farther than continuous flight. -- When equipping mid-air (descent velocity higher), use airstopper but increase descent slope afterwards. -- Create airbreak flag so all equips mid-flight use faster descent. -- Reset airbreak flag only when land (canExist goes false). -- Issue: it wouldn't reset if land in water, use fly, and launch from air, before I added test for water, -- not sure if there are other such cases. -- Temporarily add hud debug display to show descent velocity, gravity override, and airbreak flag. -- Still in process of tuning all the parameters. -- Modifications by Piezo_ -- 2018-11-25 -- hud overlay and debug can be enabled/disabled -- Added blender-rendered overlay for struts using the actual model. -- Reduced airbreak penalty severity -- gave glider limited durability. local HUD_Overlay = true --show glider struts as overlay on HUD local debug = false --show debug info in top-center of hud hangglider = {} --Make this global, so other mods can tell if hangglider exists. hangglider.use = {} if HUD_Overlay then hangglider.id = {} -- hud id for displaying overlay with struts end if debug then hangglider.debug = {} end -- hud id for debug data hangglider.airbreak = {} -- true if falling fast when equip minetest.register_entity("hangglider:airstopper", { --A one-instant entity that catches the player and slows them down. hp_max = 3, is_visible = false, immortal = true, attach = nil, on_step = function(self, _) if self.object:get_hp() ~= 1 then self.object:set_hp(self.object:get_hp() - 1) else if self.attach then self.attach:set_detach() end self.object:remove() end end }) minetest.register_entity("hangglider:glider", { visual = "mesh", visual_size = {x = 12, y = 12}, mesh = "glider.obj", immortal = true, static_save = false, textures = {"wool_white.png","default_wood.png"}, on_step = function(self, _) local canExist = false if self.object:get_attach() then local player = self.object:get_attach("parent") if player then local pos = player:getpos() local pname = player:get_player_name() if hangglider.use[pname] then local mrn_name = minetest.registered_nodes[minetest.get_node(vector.new(pos.x, pos.y-0.5, pos.z)).name] if mrn_name then if not (mrn_name.walkable or (mrn_name.drowning and mrn_name.drowning == 1)) then canExist = true local vel = player:get_player_velocity() local grav = player:get_physics_override().gravity if debug then player:hud_change(hangglider.debug[pname].id, "text", vel.y..', '..grav..', '..tostring(hangglider.airbreak[pname])) end -- If airbreaking used, increase the descent progression to not give -- mid-flight unequip/equip cycles a distance advantage. if hangglider.airbreak[pname] then if vel.y <= -4.0 then grav = -0.2 --Extreme measures are needed, as sometimes speed will get a bit out of control elseif vel.y <= -2.0 then grav = -0.02 elseif vel.y <= -1.75 then grav = 0.00125 -- *1 elseif vel.y <= -1.5 then grav = 0.0025 -- *2 elseif vel.y <= -1.25 then grav = 0.005 -- *2 elseif vel.y <= -1 then grav = 0.015 -- *3 elseif vel.y <= -0.75 then grav = 0.04 -- *4 elseif vel.y <= -0.5 then grav = 0.08 -- *4 elseif vel.y <= -0.25 then grav = 0.12 -- *3 elseif vel.y <= 0 then grav = 0.3 -- *3 else -- vel.y > 0 grav = 0.75 -- *1.5 end else -- normal descent progression if vel.y <= -4.0 then grav = -0.2 elseif vel.y <= -2.0 then grav = -0.02 elseif vel.y <= -1.5 then grav = 0.00125 elseif vel.y <= -1.25 then grav = 0.0025 elseif vel.y <= -1 then grav = 0.005 elseif vel.y <= -0.75 then grav = 0.01 elseif vel.y <= -0.5 then grav = 0.02 elseif vel.y <= -0.25 then grav = 0.04 elseif vel.y <= 0 then grav = 0.1 else -- vel.y > 0 grav = 0.5 end end player:set_physics_override({gravity = grav}) end end end if not canExist then player:set_physics_override({ gravity = 1, jump = 1, speed = 1, }) hangglider.use[pname] = false if HUD_Overlay then player:hud_change(hangglider.id[pname], "text", "blank.png") end hangglider.airbreak[pname] = false end end end if not canExist then self.object:set_detach() self.object:remove() end end }) minetest.register_on_dieplayer(function(player) player:set_physics_override({ gravity = 1, jump = 1, }) hangglider.use[player:get_player_name()] = false end) minetest.register_on_joinplayer(function(player) local pname = player:get_player_name() player:set_physics_override({ gravity = 1, jump = 1, }) hangglider.use[pname] = false if HUD_Overlay then hangglider.id[pname] = player:hud_add({ hud_elem_type = "image", text = "blank.png", position = {x=0, y=0}, scale = {x=-100, y=-100}, alignment = {x=1, y=1}, offset = {x=0, y=0} }) end if debug then hangglider.debug[pname] = {id = player:hud_add({hud_elem_type = "text", position = {x=0.5, y=0.1}, text = "-", number = 0xFF0000}), -- red text -- ht = {50,50,50}, } end hangglider.airbreak[pname] = false end) minetest.register_on_leaveplayer(function(player) local pname = player:get_player_name() hangglider.use[pname] = nil if HUD_Overlay then hangglider.id[pname] = nil end if debug then hangglider.debug[pname] = nil end hangglider.airbreak[pname] = nil end) minetest.register_tool("hangglider:hangglider", { description = "Glider", inventory_image = "glider_item.png", stack_max=1, on_use = function(itemstack, user, pointed_thing) if not user then return end local pos = user:get_pos() local pname = user:get_player_name() if minetest.get_node(pos).name == "air" and not hangglider.use[pname] then --Equip minetest.sound_play("bedsheet", {pos=pos, max_hear_distance = 8, gain = 1.0}) if HUD_Overlay then user:hud_change(hangglider.id[pname], "text", "glider_struts.png") end local vel = user:get_player_velocity().y if vel < -2 then -- engage mid-air, falling fast, so stop but ramp velocity more quickly hangglider.airbreak[pname] = true user:set_physics_override({ gravity = 1, jump = 0, speed = 1.75, }) local stopper = minetest.add_entity(pos, "hangglider:airstopper") stopper:get_luaentity().attach = user user:set_attach( stopper, "", {x=0,y=0,z=0}, {x=0,y=0,z=0}) else user:set_physics_override({ gravity = 0.02, jump = 0, speed = 1.75, }) end hangglider.use[pname] = true -- if minetest 0.4.x use this: minetest.add_entity(user:get_pos(), "hangglider:glider"):set_attach(user, "", {x=0,y=0,z=0}, {x=0,y=0,z=0}) -- if minetest 5.x use this: -- minetest.add_entity(user:get_pos(), "hangglider:glider"):set_attach(user, "", {x=0,y=10,z=0}, {x=0,y=0,z=0}) itemstack:set_wear(itemstack:get_wear() + 255) return itemstack elseif hangglider.use[pname] then --Unequip if HUD_Overlay then user:hud_change(hangglider.id[pname], "text", "blank.png") end hangglider.use[pname] = false end end, sound = {breaks = "default_tool_breaks"}, }) minetest.register_craft({ output = "hangglider:hangglider", recipe = { {"wool:white", "wool:white", "wool:white"}, {"default:stick", "", "default:stick"}, {"", "default:stick", ""}, } })