Better map colors (+ tools) (#4697)

Reviewed-on: https://git.minetest.land/VoxeLibre/VoxeLibre/pulls/4697
Reviewed-by: the-real-herowl <the-real-herowl@noreply.git.minetest.land>
Co-authored-by: kno10 <erich.schubert@gmail.com>
Co-committed-by: kno10 <erich.schubert@gmail.com>

mods/ITEMS/mcl_maps/init.lua

@@ -30,11 +30,6 @@ local function load_json_file(name)
 end
 
 local texture_colors = load_json_file("colors")
-local palettes_grass = load_json_file("palettes_grass")
-local palettes_foliage = load_json_file("palettes_foliage")
-local palettes_water = load_json_file("palettes_water")
-
-local color_cache = {}
 
 local creating_maps = {}
 local loaded_maps = {}
@@ -66,80 +61,48 @@ function mcl_maps.create_map(pos)
 		local param2data = vm:get_param2_data()
 		local area = VoxelArea:new({ MinEdge = emin, MaxEdge = emax })
 		local pixels = {}
-		local last_heightmap
-		for x = 1, 128 do
-			local map_x = minp.x - 1 + x
-			local heightmap = {}
 		for z = 1, 128 do
 			local map_z = minp.z - 1 + z
-				local color, height
+			local last_height
+			for x = 1, 128 do
+				local map_x = minp.x - 1 + x
+				local cagg, alpha, height = { 0, 0, 0 }, 0
 				for map_y = maxp.y, minp.y, -1 do
 					local index = area:index(map_x, map_y, map_z)
 					local c_id = data[index]
 					if c_id ~= c_air then
-						color = color_cache[c_id]
-						if color == nil then
-							local nodename = minetest.get_name_from_content_id(c_id)
-							local def = minetest.registered_nodes[nodename]
-							if def then
-								local texture
-								if def.palette then
-									texture = def.palette
-								elseif def.tiles then
-									texture = def.tiles[1]
-									if type(texture) == "table" then
-										texture = texture.name
-									end
-								end
-								if texture then
-									texture = texture:match("([^=^%^]-([^.]+))$"):split("^")[1]
-								end
-								if def.palette == "mcl_core_palette_grass.png" then
-									local palette = palettes_grass[texture]
-									color = palette and { palette = palette }
-								elseif def.palette == "mcl_core_palette_foliage.png" then
-									local palette = palettes_foliage[texture]
-									color = palette and { palette = palette }
-								elseif def.palette == "mcl_core_palette_water.png" then
-									local palette = palettes_water[texture]
-									color = palette and { palette = palette }
-								else
-									color = texture_colors[texture]
-								end
-							end
+						local color = texture_colors[minetest.get_name_from_content_id(c_id)]
+						-- use param2 if available:
+						if color and type(color[1]) == "table" then
+							color = color[param2data[index] + 1] or color[1]
 						end
+						if color then
+							local a = (color[4] or 255) / 255
+							local f = a * (1 - alpha)
+							cagg[1] = cagg[1] + f * color[1]
+							cagg[2] = cagg[2] + f * color[2]
+							cagg[3] = cagg[3] + f * color[3]
+							alpha = alpha + f
 
-						if color and color.palette then
-							color = color.palette[param2data[index] + 1]
-						else
-							color_cache[c_id] = color or false
-						end
-
-						if color and last_heightmap then
-							local last_height = last_heightmap[z]
-							if last_height < map_y then
-								color = {
-									math.min(255, color[1] + 16),
-									math.min(255, color[2] + 16),
-									math.min(255, color[3] + 16),
-								}
-							elseif last_height > map_y then
-								color = {
-									math.max(0, color[1] - 16),
-									math.max(0, color[2] - 16),
-									math.max(0, color[3] - 16),
+							-- ground estimate with transparent blocks
+							if alpha > 0.70 and not height then height = map_y end
+							-- adjust color to give a 3d effect
+							if alpha >= 0.99 and last_height and height then
+								local dheight = math.min(math.max((height - last_height) * 8, -32), 32)
+								cagg = {
+									math.max(0, math.min(255, cagg[1] + dheight)),
+									math.max(0, math.min(255, cagg[2] + dheight)),
+									math.max(0, math.min(255, cagg[3] + dheight)),
 								}
 							end
-						end
-						height = map_y
-						break
+							if alpha >= 0.99 then break end
 						end
 					end
-				heightmap[z] = height or minp.y
+				end
+				last_height = height
 				pixels[z] = pixels[z] or {}
-				pixels[z][x] = color or { 0, 0, 0 }
+				pixels[z][x] = cagg or { 0, 0, 0 }
 			end
-			last_heightmap = heightmap
 		end
 		tga_encoder.image(pixels):save(map_textures_path .. "mcl_maps_map_texture_" .. id .. ".tga")
 		creating_maps[id] = nil

mods/ITEMS/mcl_maps/palettes_foliage.json

@@ -1 +0,0 @@
-{"mcl_core_palette_foliage.png": [[86, 164, 117], [109, 196, 117], [118, 177, 120], [159, 193, 114], [159, 193, 114], [74, 107, 58], [94, 190, 107], [94, 190, 107], [222, 188, 101], [90, 197, 87], [35, 175, 105], [92, 182, 119], [93, 181, 76], [93, 181, 76], [82, 153, 81], [91, 177, 85], [86, 164, 117], [94, 190, 107]]}

mods/ITEMS/mcl_maps/palettes_grass.json

@@ -1 +0,0 @@
-{"mcl_core_palette_grass.png": [[109, 196, 117], [159, 193, 114], [118, 177, 120], [118, 177, 120], [107, 186, 107], [118, 177, 120], [92, 182, 119], [92, 182, 119], [92, 182, 119], [92, 182, 119], [118, 177, 120], [109, 196, 117], [35, 175, 105], [94, 190, 107], [94, 190, 107], [94, 190, 107], [94, 190, 107], [159, 193, 114], [76, 176, 84], [164, 150, 110], [164, 150, 110], [164, 150, 110], [164, 150, 110], [159, 193, 114], [93, 181, 76], [93, 181, 76], [93, 181, 76], [93, 181, 76], [76, 118, 60], [94, 190, 107]]}

mods/ITEMS/mcl_maps/palettes_water.json

@@ -1 +0,0 @@
-{"mcl_core_palette_water.png": [[63, 118, 228], [82, 121, 179], [66, 149, 235], [65, 174, 233], [62, 104, 221], [60, 93, 215], [46, 100, 218], [61, 120, 181]]}

tools/minetestmapper/AUTHORS

@@ -0,0 +1,4 @@
+Miroslav Bendík <miroslav.bendik@gmail.com>
+ShadowNinja <shadowninja@minetest.net>
+sfan5 <sfan5@live.de>
+kno10 <erich.schubert@gmail.com>

tools/minetestmapper/COPYING

@@ -0,0 +1,22 @@
+Copyright (c) 2013-2014, Miroslav Bendík and various contributors (see AUTHORS)
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met: 
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer. 
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution. 
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

tools/minetestmapper/README.md

@@ -0,0 +1,13 @@
+Customized version of the minetestmapper utilities for voxelibre.
+
+This is *not* the full minetestmapper, just the mod + script to generate colors.txt
+
+Original version:
+https://github.com/minetest/minetestmapper/tree/master/util/
+
+To use minetestmapper, first install minetestmapper (e.g., "apt install minetestmapper").
+
+Example call:
+```
+minetestmapper -i worlds/myworld --colors games/voxelibre/tools/colors.txt --drawalpha -o /tmp/map.png
+```

tools/minetestmapper/dumpnodes/init.lua

@@ -0,0 +1,28 @@
+minetest.register_chatcommand("dumpnodes", {
+	description = "Dump node and texture list for use with minetestmapper",
+	func = function()
+		local out, err = io.open(minetest.get_worldpath() .. "/nodes.txt", 'wb')
+		if not out then return true, err end
+		for name, def in pairs(minetest.registered_nodes) do
+			local tiles = def.tiles or def.tile_images
+			if tiles and def.drawtype ~= 'airlike' then
+				local tex = nil
+				for _, tile in pairs(tiles) do
+					tex = type(tile) == 'table' and (tile.name or tile.image) or tile
+					if tex ~= "blank.png" then break end
+				end
+				if tex then
+					out:write(name .. " " .. tex)
+					if def.paramtype2 and def.paramtype2:sub(1,5) == "color" and def.palette ~= "" then
+						out:write(" " .. def.paramtype2 .. " " .. def.palette)
+					elseif def.color and def.color ~= "" then
+						out:write(" " .. def.color)
+					end
+					out:write('\n')
+				end
+			end
+		end
+		out:close()
+		return true, "Finished node dump for minetestmapper."
+	end,
+})

tools/minetestmapper/dumpnodes/mod.conf

@@ -0,0 +1,2 @@
+name = dumpnodes
+description = minetestmapper development mod (node dumper)

tools/minetestmapper/generate_colorstxt.py

@@ -0,0 +1,407 @@
+#!/usr/bin/env python3
+import sys, os.path, getopt, re, json
+from pyparsing import CharsNotIn, Suppress, infix_notation, opAssoc, ZeroOrMore
+from PIL import Image, ImageColor, ImageChops, ImageEnhance, ImageMath # aka "pillow"
+
+############
+############
+# Instructions for generating a colors.txt file for custom games and/or mods:
+# 1) Add the dumpnodes mod to a Minetest world with the chosen game and mods enabled.
+# 2) Join ingame and run the /dumpnodes chat command.
+# 3) Run this script and poin it to the installation path of the game using -g,
+#    the path(s) where mods are stored using -m and the nodes.txt in your world folder.
+#    Example command line:
+#      python3 generate_colorstxt.py \
+#        --game /usr/share/minetest/games/minetest_game \
+#        --mods ~/.minetest/mods \
+#        --mods /usr/share/minetest/textures \
+#        ~/.minetest/worlds/my_world/nodes.txt
+# 4) Copy the resulting colors.txt file to your world folder or to any other places
+#    and use it with minetestmapper's --colors option.
+# 5) Copy the resulting colors.json file to the mcl_maps mod
+###########
+###########
+
+# adjust water transparency, primarily for minetestmapper
+def adjust_water_transparency(cs):
+	if isinstance(cs[0], int):
+		return (cs[0],cs[1],cs[2], 224, 128)
+	return [(x[0],x[1],x[2], 224, 128) for x in cs]
+def strip_alpha(cs):
+	if isinstance(cs[0], int):
+		return (cs[0],cs[1],cs[2])
+	return [(x[0],x[1],x[2]) for x in cs]
+# called with nodename, colors
+REPLACEMENTS = [(re.compile(pat),rule) for pat,rule in [
+	(r'^fireflies:firefly$',None),
+	(r'^butterflies:butterfly_',None),
+	# Nicer colors for water and lava
+	(r'^(default|mclx?_core):river_water_(flowing|source)$', (36, 67, 130, 224, 128)),
+	(r'^(default|mclx?_core):water_(flowing|source)$', adjust_water_transparency), # was (36, 67, 130, 224, 128)),
+	(r'^(default|mcl_core):lava_(flowing|source)$', (230, 90, 0)),
+	# Transparency for glass nodes and panes
+	(r'^default:.*glass$', lambda c: (c[0], c[1], c[2], 64, 16)),
+	(r'^doors:.*glass[^ ]*$', lambda c: (c[0], c[1], c[2], 64, 16)),
+	(r'^mcl_core:.*glass[^ ]*$', lambda c: (c[0], c[1], c[2], 64, 16)),
+	(r'^xpanes:.*(pane|bar)', lambda c: (c[0], c[1], c[2], 64, 16)),
+	(r'^mcl_core:.*leaves(_orphan)?$', strip_alpha), # no alpha
+	(r'^mcl_core:.*ice(?:_\d+)?$', lambda c: (c[0], c[1], c[2])), # no alpha
+	(r'^mcl_core:snow$', lambda c: (c[0], c[1], c[2], 223, 31)), # almost no alpha
+	(r'^mcl_bamboo:bamboo(_endcap)?$', lambda c: (c[0], c[1], c[2], 32)), # much more alpha
+]]
+
+def usage():
+	print("Usage: generate_colorstxt.py [options] [input file]")
+	print("If not specified the input file defaults to ./nodes.txt")
+	print("The output will be written as ./colors.txt for minetestmapper")
+	print("and as ./colors.json for the mcl_maps module")
+	print("  -g / --game <folder>\t\tSet path to the game (for textures), required")
+	print("  -m / --mods <folder>\t\tAdd search path for mod textures")
+
+############ Reduce an input texture to an average color.
+def average_color(name, inp, color2):
+	data = inp.load()
+
+	c, w = [0, 0, 0], 0
+	for y in range(inp.size[0]):
+		for x in range(inp.size[1]):
+			px = data[y, x]
+			a = px[3] / 255
+			if a == 0: continue
+			c[0] = c[0] + px[0] * a
+			c[1] = c[1] + px[1] * a
+			c[2] = c[2] + px[2] * a
+			w = w + a
+
+	if w == 0:
+		print(f"Texture all transparent: {name}", file=sys.stderr)
+		return None
+	c0, c1, c2 = c[0] / w, c[1] / w, c[2] / w
+	if color2: # param2 blending
+		c0, c1, c2 = c0 * color2[0] / 255., c1 * color2[1] / 255., c2 * color2[2] / 255.
+	# for alpha, find maximum alpha in chunks to account for complex textures
+	a = 0
+	for y2 in range(0,inp.size[0]-15,8):
+		for x2 in range(0,inp.size[1]-15,8):
+			a2 = 0
+			for y in range(y2, min(y2+16,inp.size[0])):
+				for x in range(x2, min(x2+16,inp.size[1])):
+					a2 = a2 + data[y,x][3]
+			a2 = a2 / 256
+			a = max(a, a2)
+
+	if a > 0 and a < 190:
+		return tuple(int(round(x)) for x in (c0, c1, c2, a))
+	return tuple(int(round(x)) for x in (c0, c1, c2))
+
+_param2_cache = dict()
+def get_param2_colors(filename):
+	if not filename: return None
+	cols = _param2_cache.get(filename)
+	if not cols and filename in textures:
+		inp = Image.open(textures[filename]).convert('RGBA')
+		data = inp.load()
+		cols = []
+		for y in range(inp.size[1]):
+			for x in range(inp.size[0]):
+				col = data[x, y]
+				if col[3] == 0: break
+				assert len(cols) == x + y * inp.size[0]
+				cols.append((col[0], col[1], col[2])) # copy
+		_param2_cache[filename] = cols
+	return cols
+
+def get_param2_color(filename, param2):
+	if not filename: return None
+	cols = get_param2_colors(filename)
+	return cols[param2] if cols else None
+
+def apply_sed(line, exprs):
+	for expr in exprs:
+		if expr[0] == '/':
+			if not expr.endswith("/d"): raise ValueError()
+			if re.search(expr[1:-2], line):
+				return ''
+		elif expr[0] == 's':
+			expr = expr.split(expr[1])
+			if len(expr) != 4 or expr[3] != '': raise ValueError()
+			line = re.sub(expr[1], expr[2], line)
+		else:
+			raise ValueError()
+	return line
+
+# global texture cache
+textures = {}
+
+########################### Texture parser
+# Pure image load
+class Filename:
+	def __init__(self, tokens):
+		self.fn = tokens[0]
+	
+	def gen(self, prev=None):
+		if not self.fn in textures:
+			raise FileNotFoundError(self.fn)
+		im = Image.open(textures[self.fn]).convert('RGBA')
+		if not prev: return im
+		prev.alpha_composite(im)
+		return prev
+
+	def pprint(self):
+		print("Load " + self.fn)
+
+# Filter operations - todo: split them in the parser already?
+class Filter:
+	_combinere = re.compile(r"(-?\d+),(-?\d+)=(.*)")
+
+	def __init__(self, tokens):
+		self.fname = tokens[0]
+		self.opts = tokens[1:]
+
+	def gen(self, prev=None):
+		# complex image loading filter, the most important one
+		if self.fname in ["combine"]:
+			assert prev is None
+			#print(self.fname, self.opts)
+			w, h = map(int, self.opts[0].split("x"))
+			im = Image.new("RGBA", (w,h), (255,255,0,0))
+			for blit in self.opts[1:]:
+				blit = Filter._combinere.match(blit).groups()
+				x, y, bfn = int(blit[0]), int(blit[1]), blit[2]
+				if not bfn in textures:
+					print("Skipping missing texture:", bfn, file=sys.stderr)
+					return im
+				t = Image.open(textures[bfn]).convert('RGBA')
+				im.alpha_composite(t, dest=(x,y))
+			return im
+		elif self.fname == "transformFX":
+			return prev.transpose(Image.Transpose.FLIP_LEFT_RIGHT)
+		elif self.fname == "transformFY":
+			return prev.transpose(Image.Transpose.FLIP_TOP_BOTTOM)
+		elif self.fname == "transformR90":
+			return prev.transpose(Image.Transpose.ROTATE_90)
+		elif self.fname == "transformR180":
+			return prev.transpose(Image.Transpose.ROTATE_180)
+		elif self.fname == "transformR270":
+			return prev.transpose(Image.Transpose.ROTATE_270)
+		elif self.fname == "opacity":
+			#print(self.fname, self.opts)
+			f = int(self.opts[0]) / 255.
+			bands = prev.split()
+			bands[3].point(lambda x: x * f)
+			return Image.merge('RGBA', bands)
+		elif self.fname == "noalpha":
+			prev.putalpha(255)
+			return prev
+		elif self.fname == "multiply":
+			#print(self.fname, self.opts)
+			col = ImageColor.getrgb(self.opts[0])
+			im = Image.new("RGB", prev.size, col)
+			bands = prev.split()
+			im = ImageChops.multiply(im, Image.merge('RGB', bands[:3]))
+			im.putalpha(bands[3])
+			return im
+		elif self.fname == "brighten":
+			im = Image.new("RGB", prev.size, (255,255,255))
+			bands = prev.split()
+			im = Image.blend(im, Image.merge('RGB', bands[:3]), 0.5)
+			im.putalpha(bands[3])
+			return im
+		elif self.fname == "hsl":
+			#print(self.fname, self.opts)
+			assert self.opts[0] == "0", "Color shifts are currently not implemented." ## TODO
+			assert len(self.opts) == 2, "Only saturation is currently supported." ## TODO
+			f = int(self.opts[1])
+			return ImageEnhance.Color(prev).enhance(f/100. + 1)
+		elif self.fname == "colorize":
+			# Needs testing.
+			# print(self.fname, self.opts, prev.size)
+			col = ImageColor.getrgb(self.opts[0])
+			if len(self.opts) == 1:
+				im = Image.new("RGB", prev.size, col)
+				mask = prev.getchannel("A")
+				mask.point(lambda x: 255 if x > 0 else 0)
+				im.putalpha(mask)
+				return im
+			elif self.opts[1] == "alpha":
+				im = Image.new("RGB", prev.size, col)
+				im.putalpha(prev.getchannel("A"))
+				return im
+			else:
+				f = int(self.opts[1]) / 255.
+				im = Image.new("RGBA", prev.size, col)
+				mask = prev.getchannel("A")
+				mask.point(lambda x: 255 if x > 0 else 0)
+				im = Image.blend(prev, im, f)
+				im.putalpha(mask)
+				assert im.has_transparency_data
+				return im
+		elif self.fname in ["resize"]:
+			#print(self.fname, self.opts)
+			w, h = map(int, self.opts[0].split("x"))
+			return prev.resize((w,h))
+		elif self.fname in ["mask"]:
+			#print(self.fname, self.opts)
+			# bitwise AND, very odd operation
+			mfn = self.opts[0]
+			if not mfn in textures:
+				print("Skipping missing texture:", mfn, file=sys.stderr)
+				return prev
+			m = Image.open(textures[mfn]).convert('RGBA')
+			return Image.merge('RGBA', [ImageMath.unsafe_eval("a&b", a=a, b=b).convert("L") for a,b in zip(prev.split(), m.split())])
+		elif self.fname in ["lowpart"]:
+			#print(self.fname, self.opts)
+			f = int(self.opts[0]) / 100
+			t = int(prev.size[1] * f)
+			return prev.crop((0, t, prev.size[0], prev.size[1]))
+		elif self.fname in ["verticalframe"]:
+			#print(self.fname, self.opts)
+			vdiv, idx = int(self.opts[0]), int(self.opts[1])
+			h = prev.size[1] // vdiv
+			return prev.crop((0, h * idx, prev.size[0], h * (idx + 1)))
+		print("Texture filter", self.fname, *self.opts, "not implemented yet.", file=sys.stderr)
+
+	def pprint(self):
+		print(self.fname, *self.opts)
+
+class Overlay:
+	def __init__(self, tokens):
+		self.overlays = tokens[0]
+	
+	def gen(self, prev=None):
+		cur = prev
+		for o in self.overlays:
+			cur = o.gen(cur)
+		return cur
+
+	def pprint(self):
+		for o in self.overlays:
+			o.pprint()
+
+
+# not sure how we would define escapes for filenames with ^ : or backslash
+filt = (Suppress("[") + CharsNotIn("^[():")("name") + ZeroOrMore(Suppress(":") + CharsNotIn("^[():")("opt*")))("filter*")
+filt.set_parse_action(Filter)
+fname = CharsNotIn("^():\\")("filename*")
+fname.set_parse_action(Filename)
+parser = infix_notation(filt ^ fname, lpar=Suppress('('), rpar=Suppress(')'),
+	op_list=[(Suppress("^"), 2, opAssoc.LEFT, Overlay)])
+
+try:
+	opts, args = getopt.getopt(sys.argv[1:], "hg:m:", ["help", "game=", "mods="])
+except getopt.GetoptError as e:
+	print(str(e))
+	exit(1)
+if ('-h', '') in opts or ('--help', '') in opts:
+	usage()
+	exit(0)
+
+input_file = "./nodes.txt"
+output_file = "./colors.txt"
+json_file = "./colors.json"
+texturepaths = []
+
+try:
+	gamepath = next(o[1] for o in opts if o[0] in ('-g', '--game'))
+	if not os.path.isdir(os.path.join(gamepath, "mods")):
+		print(f"'{gamepath}' doesn't exist or does not contain a game.", file=sys.stderr)
+		exit(1)
+	texturepaths.append(gamepath)
+except StopIteration:
+	print("No game path set but one is required. (see --help)", file=sys.stderr)
+	exit(1)
+
+for o in opts:
+	if o[0] not in ('-m', '--mods'): continue
+	if not os.path.isdir(o[1]):
+		print(f"Given path '{o[1]}' does not exist.'", file=sys.stderr)
+		exit(1)
+	texturepaths.append(o[1])
+
+if len(args) > 2:
+	print("Too many arguments.", file=sys.stderr)
+	exit(1)
+if len(args) > 0:
+	input_file = args[0]
+
+if not os.path.exists(input_file) or os.path.isdir(input_file):
+	print(f"Input file '{input_file}' does not exist.", file=sys.stderr)
+	exit(1)
+
+# Build a cache to locate textures
+print(f"Collecting textures from {len(texturepaths)} path(s)... ", end="", flush=True)
+for path in texturepaths:
+	for dirpath, dirnames, filenames in os.walk(path):
+		for f in filenames:
+			if not f in textures:
+				textures[f] = os.path.join(dirpath, f)
+
+print("done", len(textures), "files")
+
+print("Processing nodes...")
+cmap = dict()
+fin = open(input_file, 'r')
+for line in fin:
+	line = line.rstrip('\r\n')
+	if not line or line[0] == '#':
+		#fout.write(line + '\n')
+		continue
+	line = line.split(" ")
+	node, tex = line[0], line[1]
+	if not tex or tex == "blank.png":
+		continue
+	im = None
+	if "^" in tex or "[" in tex:
+		#print(node, tex)
+		im = parser.parse_string(tex)[0].gen()
+		#assert not "/" in node
+		#im.save(os.path.join("/tmp/test",node+".png"))
+	elif tex not in textures:
+		print(f"skip {node} texture {tex} not found")
+		continue
+	else:
+		im = Image.open(textures[tex]).convert("RGBA")
+	# TODO: full param2 support
+	color2 = None
+	if len(line) == 3 and line[2].startswith("#"):
+		color2 = ImageColor.getrgb(line[2])
+	elif len(line) > 3 and line[2].startswith("color"):
+		if line[3].startswith("[combine:16x2:0,0="): line[3] = line[3][len("[combine:16x2:0,0="):] # simple resize for colorwallmounted
+		tints = get_param2_colors(line[3])
+		if tints:
+			cmap[node] = [average_color(node+" "+tex, im, v) for v in tints]
+			continue
+		print("Unsupported:", *line)
+	elif len(line) > 2:
+		print("Unsupported:", *line[2:])
+	color = average_color(node+" "+tex, im, color2)
+	cmap[node] = color
+fin.close()
+
+# fix some missing values, perform some substitutions
+for node, color in sorted(cmap.items()):
+	# Try stripping off last _postfix
+	if not color: color = cmap.get(node.rsplit("_", 1)[0])
+	for pat, rule in REPLACEMENTS:
+		if pat.search(node):
+			color = rule(color) if callable(rule) else rule
+	cmap[node] = color
+
+cmap = dict((x,y) for x,y in sorted(cmap.items()) if y) # remove remaining null entries
+
+n = 0
+fout = open(output_file, 'w')
+prefix = ""
+for node, color in cmap.items():
+	if not prefix or not node.startswith(prefix):
+		prefix = node.split(":")[0] + ":"
+		fout.write("\n# " + prefix[:-1] + "\n")
+	if not isinstance(color[0], int): color = color[0] # param2 needs minetestmapper support first
+	color = " ".join(str(x) for x in color)
+	fout.write(f"{node} {color}\n")
+	n += 1
+fout.close()
+js = json.dumps(cmap, indent="\t", separators=(",",":\t"))
+js = re.sub(r'\n\t*(?!["\t}])', " ", js) # partially undo indenting to make more compact
+open(json_file, "w").write(js)
+print(f"Done, {n} entries written.")