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VoxeLibre/mods/ITEMS/mcl_portals/portal_nether.lua

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Lua

-- Parameters
local TCAVE = 0.6
local nobj_cave = nil
-- Portal frame sizes
local FRAME_SIZE_X_MIN = 4
local FRAME_SIZE_Y_MIN = 5
local FRAME_SIZE_X_MAX = 23
local FRAME_SIZE_Y_MAX = 23
local mg_name = minetest.get_mapgen_setting("mg_name")
-- 3D noise
local np_cave = {
offset = 0,
scale = 1,
spread = {x = 384, y = 128, z = 384},
seed = 59033,
octaves = 5,
persist = 0.7
}
-- Table of objects (including players) which recently teleported by a
-- Nether portal. Those objects have a brief cooloff period before they
-- can teleport again. This prevents annoying back-and-forth teleportation.
local portal_cooloff = {}
-- Destroy portal if pos (portal frame or portal node) got destroyed
local destroy_portal = function(pos)
-- Deactivate Nether portal
local meta = minetest.get_meta(pos)
local p1 = minetest.string_to_pos(meta:get_string("portal_frame1"))
local p2 = minetest.string_to_pos(meta:get_string("portal_frame2"))
if not p1 or not p2 then
return
end
local counter = 1
local mp1
for x = p1.x, p2.x do
for y = p1.y, p2.y do
for z = p1.z, p2.z do
local p = vector.new(x, y, z)
local m = minetest.get_meta(p)
if counter == 2 then
--[[ Only proceed if the second node still has metadata.
(first node is a corner and not needed for the portal)
If it doesn't have metadata, another node propably triggred the delection
routine earlier, so we bail out earlier to avoid an infinite cascade
of on_destroy events. ]]
mp1 = minetest.string_to_pos(m:get_string("portal_frame1"))
if not mp1 then
return
end
end
local nn = minetest.get_node(p).name
if nn == "mcl_core:obsidian" or nn == "mcl_portals:portal" then
-- Remove portal nodes, but not myself
if nn == "mcl_portals:portal" and not vector.equals(p, pos) then
minetest.remove_node(p)
end
-- Clear metadata of portal nodes and the frame
m:set_string("portal_frame1", "")
m:set_string("portal_frame2", "")
m:set_string("portal_target", "")
end
counter = counter + 1
end
end
end
end
minetest.register_node("mcl_portals:portal", {
description = "Nether Portal",
_doc_items_longdesc = "A Nether portal teleports creatures and objects to the hot and dangerous Nether dimension (and back!). Enter at your own risk!",
_doc_items_usagehelp = "Stand in the portal for a moment to activate the teleportation. Entering a Nether portal for the first time will also create a new portal in the other dimension. If a Nether portal has been built in the Nether, it will lead to the Overworld. A Nether portal is destroyed if the any of the obsidian which surrounds it is destroyed, or if it was caught in an explosion.",
tiles = {
"blank.png",
"blank.png",
"blank.png",
"blank.png",
{
name = "mcl_portals_portal.png",
animation = {
type = "vertical_frames",
aspect_w = 16,
aspect_h = 16,
length = 0.5,
},
},
{
name = "mcl_portals_portal.png",
animation = {
type = "vertical_frames",
aspect_w = 16,
aspect_h = 16,
length = 0.5,
},
},
},
drawtype = "nodebox",
paramtype = "light",
paramtype2 = "facedir",
sunlight_propagates = true,
use_texture_alpha = true,
walkable = false,
diggable = false,
pointable = false,
buildable_to = false,
is_ground_content = false,
drop = "",
light_source = 11,
post_effect_color = {a = 180, r = 51, g = 7, b = 89},
alpha = 192,
node_box = {
type = "fixed",
fixed = {
{-0.5, -0.5, -0.1, 0.5, 0.5, 0.1},
},
},
groups = {not_in_creative_inventory = 1},
on_destruct = destroy_portal,
_mcl_hardness = -1,
_mcl_blast_resistance = 0,
})
-- Functions
--Build arrival portal
local function build_portal(pos, target)
local p = {x = pos.x - 1, y = pos.y - 1, z = pos.z}
local p1 = {x = pos.x - 1, y = pos.y - 1, z = pos.z}
local p2 = {x = p1.x + 3, y = p1.y + 4, z = p1.z}
for i = 1, FRAME_SIZE_Y_MIN - 1 do
minetest.set_node(p, {name = "mcl_core:obsidian"})
p.y = p.y + 1
end
for i = 1, FRAME_SIZE_X_MIN - 1 do
minetest.set_node(p, {name = "mcl_core:obsidian"})
p.x = p.x + 1
end
for i = 1, FRAME_SIZE_Y_MIN - 1 do
minetest.set_node(p, {name = "mcl_core:obsidian"})
p.y = p.y - 1
end
for i = 1, FRAME_SIZE_X_MIN - 1 do
minetest.set_node(p, {name = "mcl_core:obsidian"})
p.x = p.x - 1
end
for x = p1.x, p2.x do
for y = p1.y, p2.y do
p = {x = x, y = y, z = p1.z}
if not ((x == p1.x or x == p2.x) and (y == p1.y or y == p2.y)) then
if not (x == p1.x or x == p2.x or y == p1.y or y == p2.y) then
minetest.set_node(p, {name = "mcl_portals:portal", param2 = 0})
end
local meta = minetest.get_meta(p)
meta:set_string("portal_frame1", minetest.pos_to_string(p1))
meta:set_string("portal_frame2", minetest.pos_to_string(p2))
meta:set_string("portal_target", minetest.pos_to_string(target))
end
if y ~= p1.y then
for z = -2, 2 do
if z ~= 0 then
p.z = p.z + z
if minetest.registered_nodes[
minetest.get_node(p).name].is_ground_content then
minetest.remove_node(p)
end
p.z = p.z - z
end
end
end
end
end
end
local function find_nether_target_y(target_x, target_z)
if mg_name == "flat" then
return mcl_vars.mg_bedrock_nether_bottom_max + 5
end
local start_y = math.random(mcl_vars.mg_lava_nether_max + 1, mcl_vars.mg_bedrock_nether_top_min - 5) -- Search start
if not nobj_cave then
nobj_cave = minetest.get_perlin(np_cave)
end
local air = 4
for y = start_y, math.max(mcl_vars.mg_lava_nether_max + 1), -1 do
local nval_cave = nobj_cave:get3d({x = target_x, y = y, z = target_z})
if nval_cave > TCAVE then -- Cavern
air = air + 1
else -- Not cavern, check if 4 nodes of space above
if air >= 4 then
return y + 2
else -- Not enough space, reset air to zero
air = 0
end
end
end
return start_y -- Fallback
end
local function move_check(p1, max, dir)
local p = {x = p1.x, y = p1.y, z = p1.z}
local d = math.sign(max - p1[dir])
local min = p[dir]
for k = min, max, d do
p[dir] = k
local node = minetest.get_node(p)
-- Check for obsidian (except at corners)
if k ~= min and k ~= max and node.name ~= "mcl_core:obsidian" then
return false
end
-- Abort if any of the portal frame blocks already has metadata.
-- This mod does not yet portals which neighbor each other directly.
-- TODO: Reorganize the way how portal frame coordinates are stored.
if node.name == "mcl_core:obsidian" then
local meta = minetest.get_meta(p)
local pframe1 = meta:get_string("portal_frame1")
if minetest.string_to_pos(pframe1) ~= nil then
return false
end
end
end
return true
end
local function check_portal(p1, p2)
if p1.x ~= p2.x then
if not move_check(p1, p2.x, "x") then
return false
end
if not move_check(p2, p1.x, "x") then
return false
end
elseif p1.z ~= p2.z then
if not move_check(p1, p2.z, "z") then
return false
end
if not move_check(p2, p1.z, "z") then
return false
end
else
return false
end
if not move_check(p1, p2.y, "y") then
return false
end
if not move_check(p2, p1.y, "y") then
return false
end
return true
end
local function is_portal(pos)
local xsize, ysize = FRAME_SIZE_X_MIN-1, FRAME_SIZE_Y_MIN-1
for d = -xsize, xsize do
for y = -ysize, ysize do
local px = {x = pos.x + d, y = pos.y + y, z = pos.z}
local pz = {x = pos.x, y = pos.y + y, z = pos.z + d}
if check_portal(px, {x = px.x + xsize, y = px.y + ysize, z = px.z}) then
return px, {x = px.x + xsize, y = px.y + ysize, z = px.z}
end
if check_portal(pz, {x = pz.x, y = pz.y + ysize, z = pz.z + xsize}) then
return pz, {x = pz.x, y = pz.y + ysize, z = pz.z + xsize}
end
end
end
end
-- Attempts to light a Nether portal at pos and
-- select target position.
-- Pos can be any of the obsidian frame blocks or the inner part.
-- The frame MUST be filled only with air or any fire, which will be replaced with Nether portal blocks.
-- If no Nether portal can be lit, nothing happens.
-- Returns true on success and false on failure.
function mcl_portals.light_nether_portal(pos)
-- Only allow to make portals in Overworld and Nether
local dim = mcl_worlds.pos_to_dimension(pos)
if dim ~= "overworld" and dim ~= "nether" then
return false
end
-- Create Nether portal nodes
local p1, p2 = is_portal(pos)
if not p1 or not p2 then
return false
end
for d = 1, 2 do
for y = p1.y + 1, p2.y - 1 do
local p
if p1.z == p2.z then
p = {x = p1.x + d, y = y, z = p1.z}
else
p = {x = p1.x, y = y, z = p1.z + d}
end
local nn = minetest.get_node(p).name
if nn ~= "air" and minetest.get_item_group(nn, "fire") ~= 1 then
return false
end
end
end
local param2
if p1.z == p2.z then
param2 = 0
else
param2 = 1
end
-- Find target
local target = {x = p1.x, y = p1.y, z = p1.z}
target.x = target.x + 1
if target.y < mcl_vars.mg_nether_max and target.y > mcl_vars.mg_nether_min then
if mg_name == "flat" then
target.y = mcl_vars.mg_bedrock_overworld_max + 5
else
target.y = math.random(mcl_vars.mg_overworld_min + 40, mcl_vars.mg_overworld_min + 96)
end
else
target.y = find_nether_target_y(target.x, target.z)
end
local dmin, dmax, ymin, ymax = 0, FRAME_SIZE_X_MIN - 1, p1.y, p2.y
for d = dmin, dmax do
for y = ymin, ymax do
if not ((d == dmin or d == dmax) and (y == ymin or y == ymax)) then
local p
if param2 == 0 then
p = {x = p1.x + d, y = y, z = p1.z}
else
p = {x = p1.x, y = y, z = p1.z + d}
end
if d ~= dmin and d ~= dmax and y ~= ymin and y ~= ymax then
minetest.set_node(p, {name = "mcl_portals:portal", param2 = param2})
end
local meta = minetest.get_meta(p)
-- Portal frame corners
meta:set_string("portal_frame1", minetest.pos_to_string(p1))
meta:set_string("portal_frame2", minetest.pos_to_string(p2))
-- Portal target coordinates
meta:set_string("portal_target", minetest.pos_to_string(target))
end
end
end
return true
end
minetest.register_abm({
label = "Nether portal teleportation and particles",
nodenames = {"mcl_portals:portal"},
interval = 1,
chance = 2,
action = function(pos, node)
minetest.add_particlespawner(
32, --amount
4, --time
{x = pos.x - 0.25, y = pos.y - 0.25, z = pos.z - 0.25}, --minpos
{x = pos.x + 0.25, y = pos.y + 0.25, z = pos.z + 0.25}, --maxpos
{x = -0.8, y = -0.8, z = -0.8}, --minvel
{x = 0.8, y = 0.8, z = 0.8}, --maxvel
{x = 0, y = 0, z = 0}, --minacc
{x = 0, y = 0, z = 0}, --maxacc
0.5, --minexptime
1, --maxexptime
1, --minsize
2, --maxsize
false, --collisiondetection
"mcl_particles_teleport.png" --texture
)
for _,obj in ipairs(minetest.get_objects_inside_radius(pos,1)) do --maikerumine added for objects to travel
local lua_entity = obj:get_luaentity() --maikerumine added for objects to travel
if obj:is_player() or lua_entity then
-- Prevent quick back-and-forth teleportation
if portal_cooloff[obj] then
return
end
local meta = minetest.get_meta(pos)
local target = minetest.string_to_pos(meta:get_string("portal_target"))
if target then
-- force emerge of target area
minetest.get_voxel_manip():read_from_map(target, target)
if not minetest.get_node_or_nil(target) then
minetest.emerge_area(
vector.subtract(target, 4), vector.add(target, 4))
end
-- teleport the object
minetest.after(3, function(obj, pos, target)
-- Prevent quick back-and-forth teleportation
if portal_cooloff[obj] then
return
end
local objpos = obj:getpos()
if objpos == nil then
return
end
-- If player stands, player is at ca. something+0.5
-- which might cause precision problems, so we used ceil.
objpos.y = math.ceil(objpos.y)
if minetest.get_node(objpos).name ~= "mcl_portals:portal" then
return
end
-- Build target portal (if there isn't already one)
local n = minetest.get_node_or_nil(target)
if n and n.name ~= "mcl_portals:portal" then
local emerge_callback = function(blockpos, action, calls_remaining, param)
if calls_remaining <= 0 then
build_portal(param.target, param.pos, false)
end
end
minetest.emerge_area(vector.subtract(target, 7), vector.add(target, 7), emerge_callback, { pos = pos, target = target })
end
-- Teleport
obj:set_pos(target)
if obj:is_player() then
mcl_worlds.dimension_change(obj, mcl_worlds.pos_to_dimension(target))
minetest.sound_play("mcl_portals_teleport", {pos=target, gain=0.5, max_hear_distance = 16})
end
-- Enable teleportation cooloff for 4 seconds, to prevent back-and-forth teleportation
portal_cooloff[obj] = true
minetest.after(4, function(o)
portal_cooloff[o] = false
end, obj)
end, obj, pos, target)
end
end
end
end,
})
--[[ ITEM OVERRIDES ]]
local longdesc = minetest.registered_nodes["mcl_core:obsidian"]._doc_items_longdesc
longdesc = longdesc .. "\n" .. "Obsidian is also used as the frame of Nether portals."
local usagehelp = "To open a Nether portal, place an upright frame of obsidian with a width of 4 blocks and a height of 5 blocks, leaving only air in the center. After placing this frame, light a fire in the obsidian frame. Nether portals only work in the Overworld and the Nether."
minetest.override_item("mcl_core:obsidian", {
_doc_items_longdesc = longdesc,
_doc_items_usagehelp = usagehelp,
on_destruct = destroy_portal,
_on_ignite = function(user, pointed_thing)
local pos = pointed_thing.under
local portal_placed = mcl_portals.light_nether_portal(pos)
if portal_placed and minetest.get_modpath("doc") then
doc.mark_entry_as_revealed(user:get_player_name(), "nodes", "mcl_portals:portal")
-- Achievement for finishing a Nether portal TO the Nether
local dim = mcl_worlds.pos_to_dimension(pos)
if minetest.get_modpath("awards") and dim ~= "nether" and user:is_player() then
awards.unlock(user:get_player_name(), "mcl:buildNetherPortal")
end
return true
else
return false
end
end,
})