Tornado Base
Posted: Thu Oct 06, 2016 23:50Here is the code for a minetest tornado, pack it into an init.lua with the mod folder name as "tornado". Right click with a stick to spawn one.
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--give tons of warning
for i = 1,20 do
print("!!!WARNING, THE TORNADO MOD WILL DESTROY YOUR MAP, REMOVE IF IN CREATIVE WORLD!!!")
end
minetest.after(3, function()
for i = 1,20 do
print("!!!WARNING, THE TORNADO MOD WILL DESTROY YOUR MAP, REMOVE IF IN CREATIVE WORLD!!!")
end
end)
minetest.register_entity("tornado:t", { --basic minecart
physical = true,
collisionbox = {-0.45, -0.45, -0.45, 0.45, 0.45, 0.45},
visual = "",
--mesh = "minecart.x",
textures = {""},
visual_size = {x=1, y=1},
stepheight = 2,
automatic_face_movement_dir = 0,
timer = 0,
collide_with_objects = false,
health = 1,
timer_max = 0,
vel_goal_x = 0,
vel_goal_z = 0,
--when the entity is created in world
on_activate = function(self, staticdata, dtime_s)
--self.object:set_armor_groups({immortal=1})
--self.object:set_animation({x=45,y=45},0, 0)
--self.object:setacceleration({x=0,y=0,z=0})
end,
get_staticdata = function(self)
return minetest.serialize({
timer = self.timer,
used = self.used,
age = self.age,
})
end,
--what the mob does in the world
on_step = function(self, dtime)
self.timer = self.timer + dtime
local pos = self.object:getpos()
local vel = self.object:getvelocity()
tornado_destruction(pos,self)
if self.timer > self.timer_max then
--change velocity goal
--print("change velocity goal")
self.timer = 0
self.timer_max = math.random(2,4)
--move
self.vel_goal_x = math.random(-5,5)*math.random()
self.vel_goal_z = math.random(-5,5)*math.random()
end
self.object:setacceleration({x=self.vel_goal_x - vel.x,y=0,z=self.vel_goal_z - vel.z})
end,
})
minetest.override_item("default:stick", {
on_place = function(itemstack, placer, pointed_thing)
minetest.add_entity(pointed_thing.above, "tornado:t")
end,
})
--destroy the terrain
function tornado_destruction(pos,self)
if math.random() > 0.3 then
return
end
local radius = 4
local min = {x=pos.x-radius,y=pos.y-radius,z=pos.z-radius}
local max = {x=pos.x+radius,y=pos.y+radius,z=pos.z+radius}
local vm = minetest.get_voxel_manip()
local emin, emax = vm:read_from_map(min,max)
local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
local data = vm:get_data()
local air = minetest.get_content_id("air")
--minetest.get_name_from_content_id(content_id)
for x = -radius,radius do
for z = -radius,radius do
for y = -radius,radius do
local p_pos = area:index(pos.x+x,pos.y+y,pos.z+z)
local pos2 = {x=pos.x+x,y=pos.y+y,z=pos.z+z}
if data[p_pos] == nil then
return
end
local name = minetest.get_name_from_content_id(data[p_pos])
local node = minetest.registered_items[name]
if name ~= "air" then
if math.random() > 0.96 then
data[p_pos] = minetest.get_content_id("air")
ent = spawn_tornado_ent(pos2, node)
ent:get_luaentity().goal = self.object
break
end
end
end
end
end
--vm:update_liquids()
vm:set_data(data)
vm:calc_lighting()
vm:write_to_map()
vm:update_map()
end
core.register_entity("tornado:t_ent", {
initial_properties = {
visual = "wielditem",
visual_size = {x = 0.667, y = 0.667},
textures = {},
physical = false,
is_visible = true,
collide_with_objects = false,
collisionbox = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
},
health = 1,
node = {},
timer = 0,
set_node = function(self, node)
if node.name == "air" then
self.object:remove()
end
self.node = node
self.object:set_properties({
is_visible = true,
textures = {node.name},
})
end,
get_staticdata = function(self)
return core.serialize(self.node)
end,
on_activate = function(self, staticdata)
self.object:set_armor_groups({immortal = 1})
self.timer = 0
local node = core.deserialize(staticdata)
if node then
self:set_node(node)
elseif staticdata ~= "" then
self:set_node({name = staticdata})
end
end,
--what the mob does in the world
on_step = function(self, dtime)
self.timer = self.timer + dtime
local pos = self.object:getpos()
local vel = self.object:getvelocity()
if self.goal ~= nil then
if self.goal:get_luaentity() == nil then
self.goal = nil
return
end
local goalpos = self.goal:getpos()
if pos.y - goalpos.y > 30 then
self.object:remove()
end
--modified simplemobs api
local vec = {x=pos.x-goalpos.x, y=pos.y-goalpos.y, z=pos.z-goalpos.z}
local yaw = math.atan(vec.z/vec.x)+math.pi/2
if pos.x > goalpos.x then
yaw = yaw+math.pi
end
--self.object:setyaw(yaw)
-- make a funnel
local v = 30
local x = 0
local z = 0
local radius = vec.y/10
if math.abs(vec.x) < radius and math.abs(vec.z) < radius then
x = math.sin(yaw) * -v
z = math.cos(yaw) * v
else
x = math.sin(yaw) * v
z = math.cos(yaw) * -v
end
self.object:setacceleration({x=x, y = 2,z=z})
end
end,
})
function spawn_tornado_ent(p, node)
local obj = core.add_entity(p, "tornado:t_ent")
obj:get_luaentity():set_node(node)
return(obj)
end