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obj2lua.lua
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executable file
·689 lines (558 loc) · 16.8 KB
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#!/usr/bin/env lua
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--
-- file: obj2lua.lua
-- brief: converts a WaveFront OBJ/MTL model into a custom Spring LUA format
-- author: Dave Rodgers
--
-- Copyright (C) 2007.
-- Licensed under the terms of the GNU GPL, v2 or later.
--
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--
-- NOTE: The 'vc' (vertex color) keyword is also recognized,
-- along with its additional parameter for face indexing
--
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
local VERSION = "1.0"
local bool inSpring = (Spring ~= nil)
if (not inSpring) then
require("string")
require("table")
require("io")
require("os")
end
-- local speedups
local print = print
local pairs = pairs
local ipairs = ipairs
local getn = table.getn
local insert = table.insert
local str_find = string.find
local str_gfind = string.gfind
local str_gsub = string.gsub
-- utility
local printf = function(fmt, ...)
print(string.format(fmt, unpack(arg)))
end
--------------------------------------------------------------------------------
if ((not inSpring) and (not arg[1])) then
print('Usage: '..arg[0]..' file.obj')
return
end
local function Basename(fullpath)
local _,_,base = str_find(fullpath, "([^\\/:]*)$")
local _,_,path = str_find(fullpath, "(.*[\\/:])[^\\/:]*$")
if (path == nil) then path = "" end
return base, path
end
local filename = arg[1]
local linenum = 0
local line = ""
local base, path = Basename(filename)
local infile = io.open(filename, 'r')
if (not infile) then
print('Could not open: '..arg[1])
return
end
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
local function LineError(msg)
print(filename .. ":" .. linenum .. ": " .. msg)
print("--> " .. line)
return false
end
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
local mtls = {} -- map of names to material tables
local objs = {} -- array of objects
local verts = {} -- array of 3D vertices
local txcds = {} -- array of 2D texture coordinates
local norms = {} -- array of 3D normals
local colors = {} -- array of 4D colors (not part of the OBJ spec)
local mCount = 0
local oCount = 0
local vCount = 0
local tCount = 0
local nCount = 0
local cCount = 0
local exts = {
xmin = 0, xmax = 0,
ymin = 0, ymax = 0,
zmin = 0, zmax = 0
}
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
local function NewObject(name)
return {
name = name,
mats = {}, -- name = faces{} map
tricount = 0
}
end
local currobj = NewObject("")
local currmat = ""
--------------------------------------------------------------------------------
local function NewMaterial(name)
return {
name = name,
ambient = { 0.2, 0.2, 0.2, 1.0 },
diffuse = { 0.8, 0.8, 0.8, 1.0 },
emission = { 0.0, 0.0, 0.0, 1.0 },
specular = { 0.0, 0.0, 0.0, 1.0 },
alpha = 1.0,
shininess = 0.0,
texture = "",
lighting = true
}
end
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
local function Tokenize(line)
local words = {}
local wc = 0
for w in str_gfind(line, "[^%s]+") do
words[wc] = w
wc = wc + 1
end
if (wc < 1) then return "" end -- empty line
local cmd = words[0]
if (string.sub(cmd, 1, 1) == '#') then return "" end
wc = wc - 1
return cmd, wc, words
end
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
local currmtl = nil
local function ParseColor(words, wc)
if (wc < 3) then
return nil
end
local c = { tonumber(words[1]), tonumber(words[2]), tonumber(words[3]) }
if ((c[1] == nil) or (c[2] == nil) or (c[3] == nil)) then
return nil
end
c[4] = 1.0
return c
end
local function ParseMtlLine(mtlfile)
local cmd, wc, words = Tokenize(line)
if (cmd == "") then
return true
end
if (wc < 1) then
return LineError("missing arguments")
end
if (cmd == "newmtl") then
if (currmtl) then
mtls[currmtl.name] = currmtl
end
currmtl = NewMaterial(words[1])
elseif (currmtl == nil) then
return LineError("missing material definition")
elseif (cmd == "map_Kd") then
currmtl.texture = words[1]
elseif (cmd == "Ka") then
local color = ParseColor(words, wc)
if (color == nil) then
return LineError("bad ambient color")
end
currmtl.ambient = color
elseif (cmd == "Kd") then
local color = ParseColor(words, wc)
if (color == nil) then
return LineError("bad diffuse color")
end
currmtl.diffuse = color
elseif (cmd == "Ks") then
local color = ParseColor(words, wc)
if (color == nil) then
return LineError("bad specular color")
end
currmtl.specular = color
elseif (cmd == "Ke") then
local color = ParseColor(words, wc)
if (color == nil) then
return LineError("bad emission color")
end
currmtl.emission = color
elseif (cmd == "d") then
currmtl.alpha = tonumber(words[1])
if (not currmtl.alpha) then
return LineError("bad alpha (d)")
end
elseif (cmd == "Ns") then
local hardness = tonumber(words[1])
if (not hardness) then
return LineError("bad shininess (Ns)")
end
currmtl.shininess = hardness * (128 / 100)
elseif (cmd == "illum") then
local illum = tonumber(words[1])
if (not currmtl.alpha) then
return LineError("bad illum")
end
currmtl.lighting = (illum > 0)
end
return true
end
local function ParseMTL(mtlfile)
mtlfile = path .. mtlfile
local infile = io.open(mtlfile, 'r')
if (not infile) then
return LineError("could not open mtl file, " .. mtlfile)
end
local oldFilename = filename
local oldLinenum = linenum
local oldLine = line
for l in infile:lines() do
line = l
linenum = linenum + 1
if (not ParseMtlLine(line)) then
return false
end
end
if (currmtl ~= nil) then
mtls[currmtl.name] = currmtl
end
io.close(infile)
line = oldLine
linenum = oldLinenum
filename = oldFilename
return true
end
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
local function ParseIndex(i, size)
if (i == nil) then return nil end
if (i == "") then return 0 end
local num = tonumber(i)
if (num == nil) then return nil end
if (num < 0) then
num = num + size + 1
end
if (num < 0) then return nil end
return num
end
local function ParseIndices(text)
local _,_,v,t,n,c = str_find(text, "([^/]*)/?([^/]*)/?([^/]*)/?([^/]*)")
v = ParseIndex(v, getn(verts))
t = ParseIndex(t, getn(txcds))
n = ParseIndex(n, getn(norms))
c = ParseIndex(c, getn(colors))
if (v == nil) then print("bad v index "..tostring(v)) end
if (t == nil) then print("bad t index "..tostring(t)) end
if (n == nil) then print("bad n index "..tostring(n)) end
if (c == nil) then print("bad c index "..tostring(c)) end
if ((v == nil) or (t == nil) or (n == nil) or (c == nil)) then
return nil
end
return { v = v, t = t, n = n, c = c }
end
--------------------------------------------------------------------------------
local function ParseObjLine()
local cmd, wc, words = Tokenize(line)
if (cmd == "") then
return true
end
-- material library
if (cmd == 'mtllib') then
if (wc < 1) then
return LineError("could not parse MTL file")
end
return ParseMTL(words[1])
-- material
elseif (cmd == 'usemtl') then
currmat = words[1] or ""
elseif (cmd == 'o') then
if (currobj.tricount > 0) then
insert(objs, currobj)
end
currobj = NewObject(words[1] or "")
-- smoothing group
elseif (cmd == 'g') then
-- face
elseif (cmd == 'f') then
if (wc < 3) then
return LineError("face with less then 3 vertices")
end
local face = {}
for _,w in ipairs(words) do
indices = ParseIndices(w)
if (indices == nil) then
return LineError("invalid indices");
else
insert(face, indices)
end
end
-- insert the face into the material set
mat = currobj.mats[currmat]
if (mat) then
insert(mat, face)
else
currobj.mats[currmat] = { face }
end
currobj.tricount = currobj.tricount + (wc - 2)
-- vertex
elseif (cmd == 'v') then
if (wc < 3) then
return LineError("bad vertex")
end
local v = { tonumber(words[1]), tonumber(words[2]), tonumber(words[3]) }
if ((v[1] == nil) or (v[2] == nil) or (v[3] == nil)) then
return LineError("bad vertex")
end
insert(verts, v)
-- texcoord
elseif (cmd == 'vt') then
if (wc < 2) then
return LineError("bad texcoord")
end
local t = { tonumber(words[1]), tonumber(words[2]) }
if ((t[1] == nil) or (t[2] == nil)) then
return LineError("bad texcoord")
end
insert(txcds, t)
-- normal
elseif (cmd == 'vn') then
if (wc < 3) then
return LineError("bad normal")
end
local n = { tonumber(words[1]), tonumber(words[2]), tonumber(words[3]) }
if ((n[1] == nil) or (n[2] == nil) or (n[3] == nil)) then
return LineError("bad normal")
end
insert(norms, n)
-- color (not part of the wavefront spec)
elseif (cmd == 'vc') then
if (wc < 3) then
return LineError("bad color")
end
local c = { tonumber(words[1]), tonumber(words[2]),
tonumber(words[3]), tonumber(words[4]) }
if ((c[1] == nil) or (c[2] == nil) or (c[3] == nil)) then
return LineError("bad color")
end
if (c[4] == nil) then c[4] = 1.0 end
insert(colors, c)
end
return true
end
--------------------------------------------------------------------------------
local function ParseOBJ()
local infile = io.open(filename, 'r')
if (not infile) then
print('Could not open: '..arg[1])
return false
end
for l in infile:lines() do
line = l
linenum = linenum + 1
if (not ParseObjLine(line)) then
return false
end
end
if (currobj.tricount > 0) then
insert(objs, currobj)
end
io.close(infile)
return true
end
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
local function CalculateExtents()
local xmin, ymin, zmin = 1.0e36, 1.0e36, 1.0e36
local xmax, ymax, zmax = -1.0e36, -1.0e36, -1.0e36
for _,v in ipairs(verts) do
if (v[1] < xmin) then xmin = v[1] end
if (v[2] < ymin) then ymin = v[2] end
if (v[3] < zmin) then zmin = v[3] end
if (v[1] > xmax) then xmax = v[1] end
if (v[2] > ymax) then ymax = v[2] end
if (v[3] > zmax) then zmax = v[3] end
end
exts = {
xmin = xmin, xmax = xmax,
ymin = ymin, ymax = ymax,
zmin = zmin, zmax = zmax
}
end
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
local function SafeName(name)
return string.format("%q", name)
end
local function ColorString(color, alpha)
return string.format("{ %f, %f, %f, %f }",
color[1], color[2], color[3], alpha)
end
local function PrintCommentLine()
print("----------------------------------------" ..
"----------------------------------------")
end
local function PrintMaterial(mtl)
print(" name = " .. SafeName(mtl.name) .. ",")
print(" texture = " .. SafeName(mtl.texture) .. ",")
print(" ambient = " .. ColorString(mtl.ambient, 1.0) .. ",")
print(" diffuse = " .. ColorString(mtl.diffuse, mtl.alpha) .. ",")
print(" emission = " .. ColorString(mtl.emission, 1.0) .. ",")
print(" specular = " .. ColorString(mtl.specular, 1.0) .. ",")
print(" shininess = " .. mtl.shininess .. ",")
print(" lighting = " .. tostring(mtl.lighting))
end
local function PrintMaterials()
print()
print("local mtls = {}")
for name,mtl in pairs(mtls) do
print("mtls[" .. SafeName(name) .. "] = {")
PrintMaterial(mtl)
print("}")
end
print()
end
local function PrintArrays()
print()
print("local v = {}")
for i,d in ipairs(verts) do
printf("v[%i] = { %f, %f, %f }", i, d[1], d[2], d[3])
end
print() PrintCommentLine() print()
print("local t = {}")
for i,d in ipairs(txcds) do
printf("t[%i] = { %f, %f }", i, d[1], d[2])
end
print() PrintCommentLine() print()
print("local n = {}")
for i,d in ipairs(norms) do
printf("n[%i] = { %f, %f, %f }", i, d[1], d[2], d[3])
end
print() PrintCommentLine() print()
print("local c = {}")
for i,d in ipairs(colors) do
printf("c[%i] = { %f, %f, %f, %f }", i, d[1], d[2], d[3], d[4])
end
print()
end
local function PrintFace(face)
local msg = ""
for i,e in ipairs(face) do
if (i > 1) then msg = msg .. ", " end
msg = msg .. "{" .. e.v .. "," .. e.t .. "," ..e.n
if (e.c > 0) then
msg = msg .. "," ..e.c.."}"
else
msg = msg .. "}"
end
end
print(" {" .. msg .. "},")
end
local function PrintObject(i, obj)
print(" name = " .. SafeName(obj.name) .. ",")
print(" mats = {")
for m,mat in pairs(obj.mats) do
print(" [" .. SafeName(m) .. "] = {")
for i,f in ipairs(mat) do
PrintFace(f)
end
print(" },")
end
print(" }")
end
local function PrintObjects()
local tris = 0
print()
print("local objs = {}")
for o,obj in ipairs(objs) do
printf("objs[%i] = { -- %i tris", o, obj.tricount)
PrintObject(o, obj)
printf("}", o)
tris = tris + obj.tricount
end
print()
end
local function PrintExtents()
print()
print("local exts = {")
print(" xmin = " .. exts.xmin .. ",")
print(" xmax = " .. exts.xmax .. ",")
print(" ymin = " .. exts.ymin .. ",")
print(" ymax = " .. exts.ymax .. ",")
print(" zmin = " .. exts.zmin .. ",")
print(" zmax = " .. exts.zmax)
print("}")
print()
end
local function PrintReturn()
print()
print("return \"" .. VERSION .. "\", objs, mtls, v, t, n, c, exts")
print()
end
local function PrintStats()
local triCount = 0
for _,obj in ipairs(objs) do
triCount = triCount + obj.tricount
end
local matCount = 0
for _ in pairs(mtls) do
matCount = matCount + 1
end
print("--")
print("-- filename: " .. filename)
print("-- objects: " .. getn(objs))
print("-- triangles: " .. triCount)
print("-- materials: " .. matCount)
print("-- vertices: " .. getn(verts))
print("-- texcoorcds: " .. getn(txcds))
print("-- normals: " .. getn(norms))
print("-- colors: " .. getn(colors))
print("--")
end
local function PrintHeader()
print("--")
print("-- Spring LUA model file (V" .. VERSION .. ")")
print("--")
print("-- created by trepan's obj2lua.lua")
print("--")
end
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
if (not inSpring) then
if (ParseOBJ(filename)) then
CalculateExtents()
PrintCommentLine()
PrintCommentLine() PrintHeader()
PrintCommentLine()
PrintCommentLine() PrintStats()
PrintCommentLine()
PrintCommentLine() PrintMaterials()
PrintCommentLine() PrintArrays()
PrintCommentLine() PrintObjects()
PrintCommentLine()
PrintCommentLine() PrintExtents()
PrintCommentLine()
PrintCommentLine() PrintReturn()
PrintCommentLine()
PrintCommentLine() PrintStats()
PrintCommentLine()
PrintCommentLine()
end
end
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
if (inSpring) then
return function(filename)
objs, mtls, verts, txcds, norms, colors = {}, {}, {}, {}, {}, {}
oCount, mCount, vCount, tCount, nCount, cCount = 0, 0, 0, 0, 0, 0
if (ParseOBJ(filename)) then
CalculateExtents()
return VERSION, objs, mtls, verts, txcds, norms, colors, exts
else
return nil
end
end
end
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------