Convert the modpack into a standalone game for the Minetest engine

Integrated into the game is most of minetest_game as the stable base

mods/led_marquee/LICENSE

@@ -0,0 +1,600 @@
+License for code: LGPL 3.0
+License for media and all other assets:  CC-by-SA 4.0
+
+###############################################################################
+
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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mods/led_marquee/README.md

@@ -0,0 +1,84 @@
+This mod provides set of alphanumeric LED marquee panels, controlled by Mesecons' Digilines mod.
+
+Simply place one or more panels, and set a channel on just the left-most or upper-left one.
+
+Then send a character, a string, or one of several control words or codes to that channel from a Mesecons Lua Controller and the mod will try to display it.
+
+A single character will be displayed on the connected panel.
+
+A numeric message (i.e. not a string) will be converted into a string.
+
+Strings of all types (other than the keywords below) will be displayed using all panels in a lineup, so long as they all face the same way, starting from the panel the Lua Controller is connected to, going left to right. The other panels in the line do not need to be connected to anything - think of them as being connected together internally. Only the panel at the far left need be connected to the Lua Controller.
+
+The string will spread down the line until either a panel is found that faces the wrong way, or has a channel that's not empty/nil and is set to something other than what the first is set to, or if a node is encountered that is not an alpha-numeric panel at all.
+
+Panels to the left of the connected one are ignored (unless they, too, have their own connections).
+
+You can also stack up a wall of LED panels, of any horizontal and vertical amount. If you then set a channel on the upper left panel, leave the others un-set, and connect a LuaController to it via digilines, the whole wall of panels will be treated as a multi-line display.
+
+Long strings sent to that channel will be displayed starting at the upper-left and working from left to right, top to bottom, wrapping from line to line as appropriate (similar to printing to a shell terminal).
+
+As with a single line, printing continues from node to node until the program either finds a panel with a different non-empty channel than the first one, or if it finds a panel that's facing the wrong way.
+
+If the program finds something other than a panel, it wraps to the next line. If it finds something other than a panel twice in a row, that signals that text has wrapped off of the last row, and printing is cut off there.
+
+Lines of panels don't need to be all the same length, the program will wrap as needed, with the left margin always being aligned with the panel the LuaController is connected to.
+
+Strings are trimmed to 6 kB.
+
+Panels are not erased between prints.
+
+Any unrecognized symbol or character, whether part of a string or singularly is ignored, except as noted below.
+
+This mod uses the full ISO-8859-1 character set (see https://en.wikipedia.org/wiki/ISO/IEC_8859-1 for details), plus a bunch of symbols stuffed into the normally-empty 128-159 range that should be useful on this sort of display:
+
+* 128,129: musical notes
+* 130-140: box drawing glyphs
+* 141-144: block shades
+* 145-152: arrows
+* 153-156: explosion/splat
+* 157-159: smileys
+
+If a string is prefixed with character code 255, it is treated as UTF-8 and passed through a simple translation function.  Only characters with codes greater than 159 are altered; normal ASCII text, color codes, control codes, and the above symbols are passed through unchanged.  Note that in this mode, a character code over 159 is treated as the first byte of a two-byte symbol.
+
+The panels also respond to these control messages:
+
+* "clear" turns all panels in a lineup or wall off, or up to 2048 of them, anyway - essentially a "clear screen" command.
+* "allon" fills all panels in a lineup/wall, up to a max of 2048 of them, with char(144), i.e. the reverse of "clear".
+* "start_scroll" starts the automatic scrolling function, repeatedly moving the last displayed message to the left one character space each time the scroll timer runs out (and automatically restarting it, natch).  The scroll action will spread across the line, and down a multi-line wall (just set a new, different channel on the first row you want to exclude), and will continue until "stop_scroll" or any displayable message is received.
+
+	As it advances through the message, the scroll code will search through the message for a printable character, on each scroll step, basically stripping-out color code, and using just the last one before the new start position.  This is done in order to keep a constant visible speed (the text will still be colored properly though).
+* "stop_scroll" does just what it says - it stops the auto-scroll timer.  
+* "scroll_speed" followed by a decimal number (in the string, not a byte value) sets the time between scroll steps.  Minimum 0.2s, maximum 5s.
+* "scroll_step" will immediately advance the last-displayed message by one character.  Omit the above automatic scrolling keywords, and use ONLY this keyword instead if you want to let your LuaController control the scrolling speed.  Optionally, you can follow this with a number and the scroll code will skip forward that many bytes into the message, starting from the current position, before starting the above-mentioned color-vs-character search.  Essentially, this value will roughly translate to the number of printable characters to skip.
+* "get" will read the one character (as a numerical character value) currently displayed by the master panel (by reading its node name)
+* "getstr" will read the last-stored message for the entire lineup/wall (from the master panel's meta).  Note that even if the message has been or is being scrolled, you'll get the original stored message.
+* "getindex" will read the scroll index position in that message, which will always point at a printable character, per the above color-versus-character search.
+
+During a scroll event, the printed string is padded with spaces (one in auto mode, or as many as the skip value when manually stepping).
+
+If you need vertical scrolling, you will have to handle that yourself (since the size of a screen/wall is not hard-coded).
+
+To change colors, put a "/" followed by a digit or a letter from "A" to "R" (or "a" to "r") into your printed string.  Digits 0 to 9 trigger colors 0 to 9 (obviously :-) ), while A/a through R/r set colors 10 to 27.  Any other sequence is invalid and will just be printed literally.  Two slashes "//" will translated to a single char(30) internally, and displayed as a single slash (doing it that way makes the code easier).
+
+Color values 0 to 11 are:
+
+Red (0), orange, yellow, lime, green, aqua, cyan, sky blue, blue, violet, magenta, or red-violet (11)
+
+Colors 12 to 23 are the same as 0 to 11, but lower brightness.
+
+Colors 24 - 27 are white, light grey, medium grey, and dim grey (or think of them as full bright white, a bit less bright, medium brightness, and dim white).
+
+The last color that was used is stored in the left-most/upper-left "master" panel's metadata, and defaults to red. It should persist across reboots.
+
+char(10) will do its job as linefeed/newline.
+
+char(29) signals a cursor position command. The next two byte values select a column and row, respectively. The next character after the row byte will be printed there, and the rest of the string then continues printing from that spot onward with normal line wrapping, colors and so forth. Note that any string that does NOT contain cursor positioning commands will automatically start printing at the upper-left.
+
+Any number of color, line feed, and cursor position commands may be present in a string, making it possible to "frame-buffer" a screen full of text into a string before printing it.
+
+All panels emit a small amount of light when displaying something.
+
+The panels only mount on a wall.
+
+The "master"/connected panel stores the last-displayed message and some other details in its metadata, so you may occasionally need to dig and re-place the panel if things go wonky (this won't happen during normal use, but it may happen if you're making lots of changes to the panels' layout, channel names, etc).

mods/led_marquee/depends.txt

@@ -0,0 +1,5 @@
+default
+digilines
+mesecons_luacontroller
+mesecons_microcontroller?
+mesecons_lamp?

mods/led_marquee/description.txt

@@ -0,0 +1 @@
+This mod provides a simple LED marquee that accepts single characters, strings, and special control words via digilines.

mods/led_marquee/init.lua

@@ -0,0 +1,476 @@
+-- simple LED marquee mod
+-- by Vanessa Dannenberg
+
+led_marquee = {}
+led_marquee.scheduled_messages = {}
+
+led_marquee.message_minimum_time   = tonumber(minetest.settings:get("led_marquee_message_minimum_time"))   or 0.5
+
+led_marquee.message_schedule_dtime = tonumber(minetest.settings:get("led_marquee_message_schedule_dtime")) or 0.2
+led_marquee.message_schedule_size  = tonumber(minetest.settings:get("led_marquee_message_schedule_size"))  or 10
+led_marquee.relay_timer = 0
+
+local S
+if minetest.get_modpath("intllib") then
+	S = intllib.make_gettext_pair()
+else
+	S = function(s) return s end
+end
+
+local color_to_char = {
+	"0",
+	"1",
+	"2",
+	"3",
+	"4",
+	"5",
+	"6",
+	"7",
+	"8",
+	"9",
+	"A",
+	"B",
+	"C",
+	"D",
+	"E",
+	"F",
+	"G",
+	"H",
+	"I",
+	"J",
+	"K",
+	"L",
+	"M",
+	"N",
+	"O",
+	"P",
+	"Q",
+	"R"
+}
+
+local char_to_color = {
+	["0"] = 0,
+	["1"] = 1,
+	["2"] = 2,
+	["3"] = 3,
+	["4"] = 4,
+	["5"] = 5,
+	["6"] = 6,
+	["7"] = 7,
+	["8"] = 8,
+	["9"] = 9,
+
+	["A"] = 10,
+	["B"] = 11,
+	["C"] = 12,
+	["D"] = 13,
+	["E"] = 14,
+	["F"] = 15,
+	["G"] = 16,
+	["H"] = 17,
+	["I"] = 18,
+	["J"] = 19,
+	["K"] = 20,
+	["L"] = 21,
+	["M"] = 22,
+	["N"] = 23,
+	["O"] = 24,
+	["P"] = 25,
+	["Q"] = 26,
+	["R"] = 27,
+
+	["a"] = 10,
+	["b"] = 11,
+	["c"] = 12,
+	["d"] = 13,
+	["e"] = 14,
+	["f"] = 15,
+	["g"] = 16,
+	["h"] = 17,
+	["i"] = 18,
+	["j"] = 19,
+	["k"] = 20,
+	["l"] = 21,
+	["m"] = 22,
+	["n"] = 23,
+	["o"] = 24,
+	["p"] = 25,
+	["q"] = 26,
+	["r"] = 27
+
+}
+
+-- the following functions based on the so-named ones in Jeija's digilines mod
+
+local reset_meta = function(pos)
+	minetest.get_meta(pos):set_string("formspec", "field[channel;Channel;${channel}]")
+end
+
+local on_digiline_receive_std = function(pos, node, channel, msg)
+	local meta = minetest.get_meta(pos)
+	local setchan = meta:get_string("channel")
+	if setchan ~= channel then return end
+	local num = tonumber(msg)
+	if msg == "colon" or msg == "period" or msg == "off" or (num and (num >= 0 and num <= 9)) then
+			minetest.swap_node(pos, { name = "led_marquee:marquee_"..msg, param2 = node.param2})
+	end
+end
+
+-- convert Lua's idea of a UTF-8 char to ISO-8859-1
+
+-- first char is non-break space, 0xA0
+local iso_chars=" ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ"
+
+local get_iso = function(c)
+	local hb = string.byte(c,1) or 0
+	local lb = string.byte(c,2) or 0
+	local dec = lb+hb*256
+	local char = dec - 49664
+	if dec > 49855 then char = dec - 49856 end
+	return char
+end
+
+local make_iso = function(s)
+	local i = 1
+	local s2 = ""
+	while i <= string.len(s) do
+		if string.byte(s,i) > 159 then
+			local ciso = get_iso(string.sub(s, i, i+1))
+			if ciso >= 0 and ciso < 256 then
+				s2 = s2..string.char(ciso)
+			else
+				s2 = s2..string.char(127)
+			end
+			i = i + 2
+		else
+			s2 = s2..string.sub(s, i, i)
+			i = i + 1
+		end
+	end
+	return s2
+end
+
+-- scrolling
+
+led_marquee.set_timer = function(pos, timeout)
+	local timer = minetest.get_node_timer(pos)
+	timer:stop()
+	if not timeout or timeout < led_marquee.message_minimum_time or timeout > 5 then return false end
+
+	if timeout > 0 then
+		local meta = minetest.get_meta(pos)
+		meta:set_int("timeout", timeout)
+		timer:start(timeout)
+	end
+end
+
+led_marquee.scroll_text = function(pos, elapsed, skip)
+	skip = skip or 1
+	local meta = minetest.get_meta(pos)
+	local msg = meta:get_string("last_msg")
+	local channel = meta:get_string("channel")
+	local index = meta:get_int("index")
+	local color = meta:get_int("last_color")
+	local colorchar = color_to_char[color+1]
+	if not index or index < 1 then index = 1 end
+	local len = string.len(msg)
+	index = index + skip
+	if index > len then index = 1 end
+
+	-- search backward to find the most recent color code in the string
+	local r = index
+	while r > 0 and not string.match(string.sub(msg, r, r+1), "/[0-9A-Ra-r]") do
+		r = r - 1
+	end
+	if r == 0 then r = 1 end
+	if string.match(string.sub(msg, r, r+1), "/[0-9A-Ra-r]") then
+		colorchar = string.sub(msg, r+1, r+1)
+	end
+
+	-- search forward to find the next printable symbol after the current index
+	local f = index
+	while f < len do
+		if string.match(string.sub(msg, f-1, f), "/[0-9A-Ra-r]") then
+			f = f + 2
+		else
+			break
+		end
+	end
+	led_marquee.schedule_msg(pos, channel, "/"..colorchar..string.sub(msg, f)..string.rep(" ", skip + 1))
+
+	meta:set_int("index", f)
+	if not elapsed or elapsed < 0.2 then return false end
+	return true
+end
+
+-- the nodes:
+
+local fdir_to_right = {
+	{  0, -1 },
+	{  0, -1 },
+	{  0, -1 },
+	{  0,  1 },
+	{  1,  0 },
+	{ -1,  0 },
+}
+
+local cbox = {
+	type = "wallmounted",
+	wall_top = { -8/16, 7/16, -8/16, 8/16, 8/16, 8/16 },
+	wall_bottom = { -8/16, -8/16, -8/16, 8/16, -7/16, 8/16 },
+	wall_side = { -8/16, -8/16, -8/16, -7/16, 8/16, 8/16 }
+}
+
+led_marquee.decode_color = function(msg)
+
+end
+
+minetest.register_globalstep(function(dtime)
+	if dtime <= led_marquee.message_schedule_dtime
+	  and (#led_marquee.scheduled_messages) > 0 then
+		led_marquee.display_msg(
+			led_marquee.scheduled_messages[1].pos,
+			led_marquee.scheduled_messages[1].channel,
+			led_marquee.scheduled_messages[1].msg
+		)
+	end
+	table.remove(led_marquee.scheduled_messages, 1)
+end)
+
+led_marquee.schedule_msg = function(pos, channel, msg)
+	local idx = #led_marquee.scheduled_messages
+	led_marquee.scheduled_messages[idx+1] = { pos=pos, channel=channel, msg=msg }
+
+	if idx >= led_marquee.message_schedule_size then
+		table.remove(led_marquee.scheduled_messages, 1)
+	end
+end
+
+led_marquee.display_msg = function(pos, channel, msg)
+	msg = string.sub(msg, 1, 6144).." "
+	if string.sub(msg,1,1) == string.char(255) then -- treat it as incoming UTF-8
+		msg = make_iso(string.sub(msg, 2, 6144))
+	end
+
+	local master_fdir = minetest.get_node(pos).param2 % 8
+	local master_meta = minetest.get_meta(pos)
+	local last_color = master_meta:get_int("last_color")
+	local pos2 = table.copy(pos)
+	if not last_color or last_color < 0 or last_color > 27 then
+		last_color = 0
+		master_meta:set_int("last_color", 0)
+	end
+	local i = 1
+	local len = string.len(msg)
+	local wrapped = nil
+	while i <= len do
+		local node = minetest.get_node(pos2)
+		local fdir = node.param2 % 8
+		local meta = minetest.get_meta(pos2)
+		local setchan = nil
+		if meta then setchan = meta:get_string("channel") end
+		local asc = string.byte(msg, i, i)
+		if not string.match(node.name, "led_marquee:char_") then
+			if not wrapped then
+				pos2.x = pos.x
+				pos2.y = pos2.y-1
+				pos2.z = pos.z
+				wrapped = true
+			else
+				break
+			end
+		elseif string.match(node.name, "led_marquee:char_")
+			and fdir ~= master_fdir or (setchan ~= nil and setchan ~= "" and setchan ~= channel) then
+			break
+		elseif asc == 10 then
+			pos2.x = pos.x
+			pos2.y = pos2.y-1
+			pos2.z = pos.z
+			i = i + 1
+			wrapped = nil
+		elseif asc == 29 then
+			local c = string.byte(msg, i+1, i+1) or 0
+			local r = string.byte(msg, i+2, i+2) or 0
+			pos2.x = pos.x + (fdir_to_right[fdir+1][1])*c
+			pos2.y = pos.y - r
+			pos2.z = pos.z + (fdir_to_right[fdir+1][2])*c
+			i = i + 3
+			wrapped = nil
+		elseif asc == 30 then -- translate to slash for printing
+			minetest.swap_node(pos2, { name = "led_marquee:char_47", param2 = master_fdir + (last_color*8)})
+			pos2.x = pos2.x + fdir_to_right[fdir+1][1]
+			pos2.z = pos2.z + fdir_to_right[fdir+1][2]
+			i = i + 1
+		elseif asc == 47 then -- slash
+			local ccode = string.sub(msg, i+1, i+1)
+			if ccode then
+				if char_to_color[ccode] then
+					last_color = char_to_color[ccode]
+					i = i + 2
+				else
+					minetest.swap_node(pos2, { name = "led_marquee:char_47", param2 = master_fdir + (last_color*8)})
+					pos2.x = pos2.x + fdir_to_right[fdir+1][1]
+					pos2.z = pos2.z + fdir_to_right[fdir+1][2]
+					i = i + 1
+				end
+			end
+			master_meta:set_int("last_color", last_color)
+			wrapped = nil
+		elseif asc > 30 and asc < 256 then
+			minetest.swap_node(pos2, { name = "led_marquee:char_"..asc, param2 = master_fdir + (last_color*8)})
+			pos2.x = pos2.x + fdir_to_right[fdir+1][1]
+			pos2.z = pos2.z + fdir_to_right[fdir+1][2]
+			i = i + 1
+			wrapped = nil
+		else
+			i = i + 1
+		end
+	end
+end
+
+local on_digiline_receive_string = function(pos, node, channel, msg)
+	local meta = minetest.get_meta(pos)
+	local setchan = meta:get_string("channel")
+	local last_color = meta:get_int("last_color")
+	if not last_color or last_color < 0 or last_color > 27 then
+		last_color = 0
+		meta:set_int("last_color", 0)
+	end
+	local fdir = node.param2 % 8
+
+	if setchan ~= channel then return end
+	if msg and msg ~= "" and type(msg) == "string" then
+		if string.len(msg) > 1 then
+			if msg == "clear" then
+				led_marquee.set_timer(pos, 0)
+				msg = string.rep(" ", 2048)
+				meta:set_string("last_msg", msg)
+				led_marquee.schedule_msg(pos, channel, msg)
+				meta:set_int("index", 1)
+			elseif msg == "allon" then
+				led_marquee.set_timer(pos, 0)
+				msg = string.rep(string.char(144), 2048)
+				meta:set_string("last_msg", msg)
+				led_marquee.schedule_msg(pos, channel, msg)
+				meta:set_int("index", 1)
+			elseif msg == "start_scroll" then
+				local timeout = meta:get_int("timeout")
+				led_marquee.set_timer(pos, timeout)
+			elseif msg == "stop_scroll" then
+				led_marquee.set_timer(pos, 0)
+				return
+			elseif string.sub(msg, 1, 12) == "scroll_speed" then
+				local timeout = tonumber(string.sub(msg, 13)) or 0
+				led_marquee.set_timer(pos, math.max(timeout, led_marquee.message_minimum_time))
+			elseif string.sub(msg, 1, 11) == "scroll_step" then
+				local skip = tonumber(string.sub(msg, 12))
+				led_marquee.scroll_text(pos, nil, skip)
+			elseif msg == "get" then -- get the master panel's displayed char as ASCII numerical value
+				digilines.receptor_send(pos, digiline.rules.default, channel, tonumber(string.match(minetest.get_node(pos).name,"led_marquee:char_(.+)"))) -- wonderfully horrible string manipulaiton
+			elseif msg == "getstr" then -- get the last stored message
+				digilines.receptor_send(pos, digiline.rules.default, channel, meta:get_string("last_msg"))
+			elseif msg == "getindex" then -- get the scroll index
+				digilines.receptor_send(pos, digiline.rules.default, channel, meta:get_int("index"))
+			else
+				msg = string.gsub(msg, "//", string.char(30))
+				led_marquee.set_timer(pos, 0)
+				local last_msg = meta:get_string("last_msg")
+				meta:set_string("last_msg", msg)
+				led_marquee.schedule_msg(pos, channel, msg)
+				if last_msg ~= msg then
+					meta:set_int("index", 1)
+				end
+			end
+		else
+			local asc = string.byte(msg)
+			if asc > 29 and asc < 256 then
+				minetest.swap_node(pos, { name = "led_marquee:char_"..asc, param2 = fdir + (last_color*8)})
+				meta:set_string("last_msg", tostring(msg))
+				meta:set_int("index", 1)
+			end
+		end
+	elseif msg and type(msg) == "number" then
+		meta:set_string("last_msg", tostring(msg))
+		led_marquee.schedule_msg(pos, channel, tostring(msg))
+		meta:set_int("index", 1)
+	end
+end
+
+-- the nodes!
+
+for i = 31, 255 do
+	local groups = { cracky = 2, not_in_creative_inventory = 1}
+	local light = LIGHT_MAX-2
+	local description = S("LED marquee panel ("..i..")")
+	local leds = "led_marquee_char_"..i..".png^[mask:led_marquee_leds_on.png"
+
+	if i == 31 then
+		leds ={
+			name = "led_marquee_char_31.png^[mask:led_marquee_leds_on_cursor.png",
+			animation = {type = "vertical_frames", aspect_w = 32, aspect_h = 32, length = 0.75}
+		}
+	end
+
+	local wimage
+
+	if i == 32 then
+		groups = {cracky = 2}
+		light = nil
+		description = S("LED marquee panel")
+		wimage = "led_marquee_leds_off.png^(led_marquee_char_155.png^[multiply:red)"
+	end
+
+	minetest.register_node("led_marquee:char_"..i, {
+		description = description,
+		drawtype = "mesh",
+		mesh = "led_marquee.obj",
+		tiles = {
+			{ name = "led_marquee_base.png", color = "white" },
+			{ name = "led_marquee_leds_off.png", color = "white" }
+		},
+		overlay_tiles = { "", leds },
+		inventory_image = wimage,
+		wield_image = wimage,
+		palette="led_marquee_palette.png",
+		use_texture_alpha = true,
+		groups = groups,
+		paramtype = "light",
+		paramtype2 = "colorwallmounted",
+		light_source = light,
+		selection_box = cbox,
+		node_box = cbox,
+		on_construct = function(pos)
+			reset_meta(pos)
+		end,
+		on_receive_fields = function(pos, formname, fields, sender)
+			local name = sender:get_player_name()
+			if minetest.is_protected(pos, name) and not minetest.check_player_privs(name, {protection_bypass=true}) then
+				minetest.record_protection_violation(pos, name)
+				return
+			end
+			if (fields.channel) then
+				minetest.get_meta(pos):set_string("channel", fields.channel)
+			end
+		end,
+		digiline = {
+			receptor = {},
+			effector = {
+				action = on_digiline_receive_string,
+			},
+		},
+		drop = "led_marquee:char_32",
+		on_timer = led_marquee.scroll_text
+	})
+end
+
+-- crafts
+
+minetest.register_craft({
+	output = "led_marquee:char_32 6",
+	recipe = {
+		{ "default:glass", "default:glass", "default:glass" },
+		{ "mesecons_lamp:lamp_off", "mesecons_lamp:lamp_off", "mesecons_lamp:lamp_off" },
+		{ "group:wood", "mesecons_microcontroller:microcontroller0000", "group:wood" }
+	},
+})
+

mods/led_marquee/mod.conf

@@ -0,0 +1,2 @@
+name = led_marquee
+min_minetest_version = 5.2.0

mods/led_marquee/models/led_marquee.obj

@@ -0,0 +1,102 @@
+# Blender v2.79 (sub 0) OBJ File: 'LED marquee.blend'
+# www.blender.org
+o Cube_Cube_LEDs
+v 0.500000 -0.453125 -0.468750
+v -0.500000 -0.453125 -0.468750
+v -0.500000 -0.453125 0.468750
+v 0.500000 -0.453125 0.468750
+v 0.500000 -0.437500 -0.500000
+v 0.500000 -0.437500 -0.484375
+v 0.500000 -0.453125 -0.468750
+v 0.500000 -0.453125 0.468750
+v 0.500000 -0.437500 0.484375
+v 0.500000 -0.437500 0.500000
+v 0.500000 -0.500000 0.500000
+v 0.500000 -0.500000 -0.500000
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