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Also added explicit use_texture_alpha = "clip"

mods/ITEMS/vl_hollow_logs/API.md

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+# ```vl_hollow_logs```
+
+This mod registers hollow logs derived from normal logs.
+Hollow logs mostly have a decorative function, but some of them can be used in recipes. Changes may appear soon.
+
+## Functions:
+### ```vl_hollow_logs.register_hollow_log(defs)```
+This is the function that registers the hollow trunk.
+For a hollow log to be registered, the <span style="color:firebrick"> defs </span> parameter must be a table that contains up to 5 values, which are, in this order, the <span style="color:firebrick"> itemstring </span>  of the hollow log, the <span style="color:firebrick"> itemstring </span>  of the stripped hollow log, the <span style="color:firebrick"> description </span>  of the hollow log, the <span style="color:firebrick"> description </span>  of the stripped hollow log and, optionally, a <span style="color:turquoise"> boolean </span>  to inform whether this trunk is NOT flammable. If the hollow log is defined as flammable, it becomes part of the <span style="color:springgreen"> hollow_log_flammable </span> group, which allows the log to be used as fuel for furnaces and also allows it to be an ingredient for chacoal.
+
+Examples:
+```lua
+-- Flammable
+{"tree", "stripped_oak", "Hollow Oak Log", "Stripped Hollow Oak Log"}
+
+-- Not flammable
+{"crimson_hyphae", "stripped_crimson_hyphae", "Hollow Crimson Stem", "Stripped Hollow Crimson Stem", true}
+```
+### ```vl_hollow_logs.register_craft(material, result)```
+
+This function records the crafting recipe for a hollow log based on its non-hollow variant.
+This function also defines a recipe for the stonecutter. The <span style="color:firebrick"> material </span>  and <span style="color:firebrick"> result </span>  parameters must be, respectively, the <span style="color:firebrick"> complete itemstring </span>  of the source material and the (partial) <span style="color:firebrick"> itemstring </span>  of the result. See the following examples:
+
+```lua
+vl_hollow_logs.register_craft("mcl_core:tree", "tree")
+
+vl_hollow_logs.register_craft("mcl_crimson:stripped_crimson_hyphae", "stripped_crimson_hyphae")
+```

mods/ITEMS/vl_hollow_logs/init.lua

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+local modpath = minetest.get_modpath(minetest.get_current_modname())
+local S = minetest.get_translator(minetest.get_current_modname())
+
+vl_hollow_logs = {}
+--- Function to register a hollow log. See API.md to learn how to use this function.
+---@param defs table {name:string, stripped_name>string, desc:string, stripped_desc:string, not_flammable:boolean|nil}
+function vl_hollow_logs.register_hollow_log(defs)
+	if not defs or #defs < 4 then
+		error("Incomplete definition provided")
+	end
+
+	for i = 1, #defs do
+		if i == 5 then
+			if type(defs[i]) ~= "boolean" and type(defs[i]) ~= "nil" then
+				error("Invalid arg #5")
+			end
+		else
+			if type(defs[i]) ~= "string" then
+				error("Invalid arg #".. tostring(i))
+			end
+		end
+	end
+
+	local name = defs[1]
+	local stripped_name = defs[2]
+	local desc = defs[3]
+	local stripped_desc = defs[4]
+
+	local collisionbox = {
+		type = "fixed",
+		fixed = {
+			{-0.5, -0.5, -0.5, 0.5, 0.5, -0.375},
+			{-0.5, -0.5, -0.5, -0.375, 0.5, 0.5},
+			{0.375, -0.5, -0.5, 0.5, 0.5, 0.5},
+			{-0.5, -0.5, 0.375, 0.5, 0.5, 0.5},
+		}
+	}
+
+	local groups = {axey = 1, building_block = 1, handy = 1, hollow_log = 1}
+
+	if not defs[5] then
+		groups = table.insert(groups, {fire_encouragement = 5, fire_flammability = 5, flammable = 2, hollow_log_burnable = 1})
+	end
+
+	minetest.register_node("vl_hollow_logs:"..name.."_hollow", {
+		collision_box = collisionbox,
+		description = S(desc),
+		drawtype = "mesh",
+		groups = groups,
+		mesh = "vl_hollow_logs_log.obj",
+		on_place = mcl_util.rotate_axis,
+		paramtype = "light",
+		paramtype2 = "facedir",
+		use_texture_alpha = "clip",
+		sounds = mcl_sounds.node_sound_wood_defaults(),
+		sunlight_propagates = true,
+		tiles = {"vl_hollow_logs_"..name..".png"},
+		_mcl_blast_resistance = 2,
+		_mcl_hardness = 2,
+		_mcl_stripped_variant = "vl_hollow_logs:stripped_"..name.."_hollow"
+	})
+
+	minetest.register_node("vl_hollow_logs:"..stripped_name.."_hollow", {
+		collision_box = collisionbox,
+		description = S(stripped_desc),
+		drawtype = "mesh",
+		groups = groups,
+		mesh = "vl_hollow_logs_log.obj",
+		on_place = mcl_util.rotate_axis,
+		paramtype = "light",
+		paramtype2 = "facedir",
+		use_texture_alpha = "clip",
+		sounds = mcl_sounds.node_sound_wood_defaults(),
+		sunlight_propagates = true,
+		tiles = {"vl_hollow_logs_stripped_"..name..".png"},
+		_mcl_blast_resistance = 2,
+		_mcl_hardness = 2
+	})
+end
+
+vl_hollow_logs.logs = {
+	{"acaciatree", "stripped_acacia", "Hollow Acacia Log", "Stripped Hollow Acacia Log"},
+	{"birchtree", "stripped_birch", "Hollow Birch Log", "Stripped Hollow Birch Log"},
+	{"darktree", "stripped_dark_oak", "Hollow Dark Oak Log", "Stripped Hollow Dark Oak Log"},
+	{"jungletree", "stripped_jungle", "Hollow Jungle Log", "Stripped Hollow Jungle Log"},
+	{"sprucetree", "stripped_spruce", "Hollow Spruce Log", "Stripped Hollow Spruce Log"},
+	{"tree", "stripped_oak", "Hollow Oak Log", "Stripped Hollow Oak Log"}
+}
+
+
+if minetest.get_modpath("mcl_cherry_blossom") then
+	table.insert(vl_hollow_logs.logs, {"cherrytree", "stripped_cherrytree", "Hollow Cherry Log", "Stripped Hollow Cherry Log"})
+end
+
+if minetest.get_modpath("mcl_mangrove") then
+	table.insert(vl_hollow_logs.logs, {"mangrove_tree", "mangrove_stripped", "Hollow Mangrove Log", "Stripped Hollow Mangrove Log"})
+end
+
+if minetest.get_modpath("mcl_crimson") then
+	table.insert(vl_hollow_logs.logs, {"crimson_hyphae", "stripped_crimson_hyphae", "Hollow Crimson Stem", "Stripped Hollow Crimson Stem", true})
+	table.insert(vl_hollow_logs.logs, {"warped_hyphae", "stripped_warped_hyphae", "Hollow Warped Stem", "Stripped Hollow Warped Stem", true})
+end
+
+for _, defs in pairs(vl_hollow_logs.logs) do
+	vl_hollow_logs.register_hollow_log(defs)
+end
+
+dofile(modpath.."/recipes.lua")

mods/ITEMS/vl_hollow_logs/locale/template.txt

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+# textdomain: mcl_hollow_logs
+Hollow Acacia Log=
+Hollow Birch Log=
+Hollow Cherry Log=
+Hollow Dark Oak Log=
+Hollow Jungle Log=
+Hollow Mangrove Log=
+Hollow Oak Log=
+Hollow Spruce Log=
+Hollow Crimson Stem=
+Hollow Warped Stem=
+Stripped Hollow Acacia Log=
+Stripped Hollow Birch Log=
+Stripped Hollow Cherry Log=
+Stripped Hollow Dark Oak Log=
+Stripped Hollow Jungle Log=
+Stripped Hollow Mangrove Log=
+Stripped Hollow Oak Log=
+Stripped Hollow Spruce Log=
+Stripped Hollow Crimson Stem=
+Stripped Hollow Warped Stem=

mods/ITEMS/vl_hollow_logs/locale/vl_hollow_logs.pt_BR.tr

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+# textdomain: mcl_hollow_logs
+Hollow Acacia Log=Tronco Oco de Acácia
+Hollow Birch Log=Tronco Oco de Bétula
+Hollow Cherry Log=Tronco Oco de Cerejeira
+Hollow Dark Oak Log=Tronco Oco de Carvalho Escuro
+Hollow Jungle Log=Tronco Oco da Selva
+Hollow Mangrove Log=Tronco Oco de Mangue
+Hollow Oak Log=Tronco Oco de Carvalho
+Hollow Spruce Log=Tronco Oco de Pinheiro
+Hollow Crimson Stem=Caule Oco Carmesim
+Hollow Warped Stem=Caule Oco Distorcido
+Stripped Hollow Acacia Log=Tronco Oco Descascado de Acácia
+Stripped Hollow Birch Log=Tronco Oco Descascado de Bétula
+Stripped Hollow Cherry Log=Tronco Oco Descascado de Cerejeira
+Stripped Hollow Dark Oak Log=Tronco Oco Descascado de Carvalho Escuro
+Stripped Hollow Jungle Log=Tronco Oco Descascado da Selva
+Stripped Hollow Mangrove Log=Tronco Oco Descascado de Mangue
+Stripped Hollow Oak Log=Tronco Oco Descascado de Carvalho
+Stripped Hollow Spruce Log=Tronco Oco Descascado de Pinheiro
+Stripped Hollow Crimson Stem=Caule Oco Descascado Carmesim
+Stripped Hollow Warped Stem=Caule Oco Descascado Distorcido

mods/ITEMS/vl_hollow_logs/mod.conf

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+name = vl_hollow_logs
+depends = mcl_core, mcl_sounds, mcl_util
+optional_depends = mcl_cherry_blossom, mcl_crimson, mcl_mangrove
+author = JoseDouglas26

mods/ITEMS/vl_hollow_logs/models/vl_hollow_logs_log.obj

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+# Blender 3.6.7
+# www.blender.org
+o hollow_log
+v -0.312500 -0.500000 0.312500
+v -0.312500 0.500000 0.312500
+v -0.312500 -0.500000 -0.312500
+v -0.312500 0.500000 -0.312500
+v 0.312500 -0.500000 0.312500
+v 0.312500 0.500000 0.312500
+v 0.312500 -0.500000 -0.312500
+v 0.312500 0.500000 -0.312500
+v -0.500000 -0.500000 -0.500000
+v -0.500000 -0.500000 0.500000
+v -0.500000 0.500000 0.500000
+v -0.500000 0.500000 -0.500000
+v 0.500000 -0.500000 -0.500000
+v 0.500000 0.500000 -0.500000
+v 0.500000 -0.500000 0.500000
+v 0.500000 0.500000 0.500000
+vn -1.0000 -0.0000 -0.0000
+vn -0.0000 -0.0000 -1.0000
+vn 1.0000 -0.0000 -0.0000
+vn -0.0000 -0.0000 1.0000
+vn -0.0000 -1.0000 -0.0000
+vn -0.0000 1.0000 -0.0000
+vt 0.380952 0.000000
+vt 0.380952 1.000000
+vt 0.000000 1.000000
+vt 0.000000 0.000000
+vt 0.619048 0.000000
+vt 0.619048 1.000000
+vt 0.928571 0.187500
+vt 0.928571 0.812500
+vt 1.000000 1.000000
+vt 1.000000 -0.000000
+vt 0.690476 0.187500
+vt 0.690476 0.812500
+s 0
+f 10/1/1 11/2/1 12/3/1 9/4/1
+f 9/1/2 12/2/2 14/3/2 13/4/2
+f 13/1/3 14/2/3 16/3/3 15/4/3
+f 15/1/4 16/2/4 11/3/4 10/4/4
+f 7/5/4 8/6/4 4/2/4 3/1/4
+f 5/5/1 6/6/1 8/2/1 7/1/1
+f 3/7/5 1/8/5 10/9/5 9/10/5
+f 2/8/6 4/7/6 12/10/6 11/9/6
+f 7/11/5 3/7/5 9/10/5 13/5/5
+f 4/7/6 8/11/6 14/5/6 12/10/6
+f 5/12/5 7/11/5 13/5/5 15/6/5
+f 8/11/6 6/12/6 16/6/6 14/5/6
+f 1/8/5 5/12/5 15/6/5 10/9/5
+f 6/12/6 2/8/6 11/9/6 16/6/6
+f 3/5/3 4/6/3 2/2/3 1/1/3
+f 1/5/2 2/6/2 6/2/2 5/1/2

mods/ITEMS/vl_hollow_logs/recipes.lua

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+function vl_hollow_logs.register_craft(material, result)
+	minetest.register_craft({
+		output = "vl_hollow_logs:"..result.."_hollow 4",
+		recipe = {
+			{"",  material, ""},
+			{material, "", material},
+			{"", material, ""}
+		},
+		type = "shaped"
+	})
+
+	mcl_stonecutter.register_recipe(material, "vl_hollow_logs:"..result.."_hollow", 1)
+end
+
+for _, defs in pairs(vl_hollow_logs.logs) do
+	local mod, material, stripped_material
+	local name = defs[1]
+	local stripped_name = defs[2]
+
+	if name:find("cherry") then
+		mod = "mcl_cherry_blossom:"
+	elseif name:find("mangrove") then
+		mod = "mcl_mangrove:"
+	elseif name:find("hyphae") then
+		mod = "mcl_crimson:"
+	else
+		mod = "mcl_core:"
+	end
+
+	material = mod..name
+	stripped_material = mod..stripped_name
+
+	vl_hollow_logs.register_craft(material, name)
+	vl_hollow_logs.register_craft(stripped_material, stripped_name)
+end
+
+minetest.register_craft({
+	burntime = 10,
+	recipe = "group:hollow_log_burnable",
+	type = "fuel",
+})
+
+minetest.register_craft({
+	cooktime = 5,
+	output = "mcl_core:charcoal_lump",
+	recipe = "group:hollow_log_burnable",
+	type = "cooking"
+})