Create ballistics.lua
its not ready for use, but I might finish later and I don't want to loose it.
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Elkien3
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155
ballistics.lua
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155
ballistics.lua
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gunslinger.penetrate = {} --table for putting in items that bullets can penetrate, and how much speed the bullet will be reduced by. usage: gunslinger.penetrate["default:glass"] = 3
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gunslinger.penetrate["default:glass"] = 4
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gunslinger.penetrate["default:wood"] = 12
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local bullets = {}
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local timer = 0
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local TICK = .05 --NOTE: I think my math is wrong somewhere, changing this value changes how the bullet behaves, so change only if you know what you are doing
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local DEBUG = false
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local force = false
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minetest.register_entity("gunslinger:bullet", {
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hp_max = 1,
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bullet = {},
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physical = false,
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pointable = false,
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collide_with_objects = false,
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-- weight = 5,
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collisionbox = {0,0,0, 0,0,0},
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visual = "sprite",
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visual_size = {x=.1, y=.1},
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textures = {"gunslinger_bullet.png"}, -- number of required textures depends on visual
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spritediv = {x=1, y=1},
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initial_sprite_basepos = {x=0, y=0},
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is_visible = true,
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makes_footstep_sound = false,
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automatic_rotate = false,
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on_activate = function(self, staticdata, dtime_s)
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minetest.after(TICK, function()
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if not self.bullet then
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self.object:remove()
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end
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end)
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end,
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})
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function gunslinger.firebullet(player, pos, velocity, drag, def)
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if not pos or not velocity or not drag or not def then return end
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local bullet = {}
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bullet.player = player
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bullet.pos = pos
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bullet.v = velocity
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bullet.drag = drag
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bullet.time = 0
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bullet.start = os.clock()
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bullet.force = true
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bullet.def = def
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bullet.entity = minetest.add_entity(pos, "gunslinger:bullet")
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bullet.entity:set_properties({bullet = bullet})
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table.insert(bullets, bullet)
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force = true
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end
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minetest.register_globalstep(function(dtime)
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timer = timer + dtime;
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if timer >= TICK or force then
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for id, bullet in pairs(bullets) do
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--local t1 = os.clock()
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if force and not bullet.force then goto continue else bullet.force = false end
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local time = timer
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if bullet.start then
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bullet.time = os.clock() - bullet.start
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time = bullet.time
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else
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bullet.time = bullet.time + timer
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end
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bullet.start = nil
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local speed = vector.length(bullet.v)
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local resistance = {}
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resistance.y = -.001*bullet.drag * (bullet.v.y * speed);
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resistance.x = -.001*bullet.drag * (bullet.v.x * speed);
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resistance.z = -.001*bullet.drag * (bullet.v.z * speed);
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bullet.v = vector.add(bullet.v, resistance)
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bullet.v.y = bullet.v.y - (9.81*time)
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local dir = vector.normalize(bullet.v)
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if bullet.entity then
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bullet.entity:set_pos(bullet.pos)
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else
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bullet.entity = minetest.add_entity(pos, "gunslinger:bullet")
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bullet.entity.bullet = bullet
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end
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if bullet.entity then
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bullet.entity:setvelocity(bullet.v)
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end
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local pos2 = vector.add(bullet.pos, vector.multiply(bullet.v, time))
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local ray = minetest.raycast(bullet.pos, pos2, true, true)
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if DEBUG then
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minetest.add_particle({
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pos = bullet.pos,
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expirationtime = 10,
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size = 4,
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texture = "gunslinger_debug.png"
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})
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end
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for pointed in ray do
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if pointed and pointed.ref and pointed.ref == bullet.player then
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goto next
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end
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local speed = vector.length(bullet.v)
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if pointed.intersection_point and pointed.type == "node" then
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if bullet.lastunder and vector.equals(bullet.lastunder, pointed.under) then goto next end
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if DEBUG then
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minetest.add_particle({
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pos = vector.subtract(pointed.intersection_point, vector.divide(dir, 50)),
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expirationtime = 10,
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size = 6,
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texture = "gunslinger_debug.png",
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vertical = true
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})
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else
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minetest.add_particle({
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pos = vector.subtract(pointed.intersection_point, vector.divide(dir, 50)),
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expirationtime = 10,
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size = 2,
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texture = "gunslinger_decal.png",
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vertical = true
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})
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end
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local name = minetest.get_node(pointed.under).name
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if name and gunslinger.penetrate[name] and speed/gunslinger.penetrate[name] > 10 then
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local factor = gunslinger.penetrate[name]
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bullet.lastunder = pointed.under
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pos2 = pointed.intersection_point
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force = true
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bullet.force = true
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bullet.v = vector.add(bullet.v, {x=math.random(-1*factor,factor), y=math.random(-1*factor,factor), z=math.random(-1*factor,factor)})
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bullet.v = vector.divide(bullet.v, factor)
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else
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bullet.entity:remove()
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table.remove(bullets, id)
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goto continue
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end
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end
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if pointed.type == "object" then
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local target = pointed.ref
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local point = pointed.intersection_point
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local speedmod = (speed+100)/((bullet.def.speed or 600)+100)
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local dmg = bullet.def.base_dmg * bullet.def.dmg_mult * speedmod
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-- Add 50% damage if headshot
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if point.y > target:get_pos().y + 1.5 then
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dmg = dmg * 1.5
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end
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target:punch(bullet.player, nil, {damage_groups={fleshy=dmg}})
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end
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::next::
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end
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if bullet.time > 10 or vector.length(bullet.v)<10 then bullet.entity:remove() table.remove(bullets, id) end
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--minetest.log("error", (string.format("elapsed time: %.2fms", (os.clock() - t1) * 1000)))
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bullet.pos = pos2
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::continue::
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end
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if not force then
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timer = 0
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else
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force = false
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end
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end
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end)
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