obj2egg.py

#!/usr/bin/python
"""
    This Version: $Id: obj2egg.py,v 1.7 2008/05/26 17:42:53 andyp Exp $
    Info: info >at< pfastergames.com

    Extended from: http://panda3d.org/phpbb2/viewtopic.php?t=3378
    .___..__ .___.___.___.__..__ .  .
      |  [__)[__ [__ [__ |  |[__)|\/|
      |  |  \[___[___|   |__||  \|  |
    obj2egg.py [n##][b][t][s] filename1.obj ...
        -n regenerate normals with # degree smoothing
            exaple -n30  (normals at less 30 degrees will be smoothed)
        -b make binarmals
        -t make tangents
        -s show in pview

    licensed under WTFPL (http://sam.zoy.org/wtfpl/)
"""

from pandac.PandaModules import *
import math
import string
import getopt
import sys, os


def floats(float_list):
    """coerce a list of strings that represent floats into a list of floats"""
    return [ float(number) for number in float_list ]

def ints(int_list):
    """coerce a list of strings that represent integers into a list of integers"""
    return [ int(number) for number in int_list ]


class ObjMaterial:
    """a wavefront material"""
    def __init__(self):
        self.filename = None
        self.name = "default"
        self.eggdiffusetexture = None
        self.eggmaterial = None
        self.attrib = {}
        self.attrib["Ns"] = 100.0
        self.attrib["d"] = 1.0
        self.attrib["illum"] = 2
        # "magenta"
        self.attrib["Kd"] = [1.0, 0.0, 1.0]
        self.attrib["Ka"] = [0.0, 0.0, 0.0]
        self.attrib["Ks"] = [0.0, 0.0, 0.0]
        self.attrib["Ke"] = [0.0, 0.0, 0.0]

    def put(self, key, value):
        self.attrib[key] = value
        return self

    def get(self, key):
        if self.attrib.has_key(key):
            return self.attrib[key]
        return None

    def has_key(self, key):
        return self.attrib.has_key(key)

    def isTextured(self):
        # for k in ("map_Kd", "map_Bump", "map_Ks"):    <-- NOT YET
        if self.attrib.has_key("map_Kd"):
            return True;
        return False;

    def getEggTexture(self):
        if self.eggdiffusetexture:
            return self.eggdiffusetexture
        if not self.isTextured():
            return none
        m = EggTexture(self.name + "_diffuse", self.get("map_Kd"))
        m.setFormat(EggTexture.FRgb)
        m.setMagfilter(EggTexture.FTLinearMipmapLinear)
        m.setMinfilter(EggTexture.FTLinearMipmapLinear)
        m.setWrapU(EggTexture.WMRepeat)
        m.setWrapV(EggTexture.WMRepeat)
        self.eggdiffusetexture = m
        return self.eggdiffusetexture

    def getEggMaterial(self):
        if self.eggmaterial:
            return self.eggmaterial
        m = EggMaterial(self.name + "_mat")
        # XXX TODO: add support for specular, and obey illum setting
        # XXX as best as we can
        rgb = self.get("Kd")
        if rgb is not None:
            m.setDiff(Vec4(rgb[0], rgb[1], rgb[2], 1.0))
        rgb = self.get("Ka")
        if rgb is not None:
            m.setAmb(Vec4(rgb[0], rgb[1], rgb[2], 1.0))
        rgb = self.get("Ks")
        if rgb is not None:
            m.setSpec(Vec4(rgb[0], rgb[1], rgb[2], 1.0))
        ns = self.get("Ns")
        if ns is not None:
            m.setShininess(ns)
        self.eggmaterial = m
        return self.eggmaterial

class MtlFile:
    """an object representing all Wavefront materials in a .mtl file"""
    def __init__(self, filename=None):
        self.filename = None
        self.materials = {}
        self.comments = {}
        if filename is not None:
            self.read(filename)

    def read(self, filename, verbose=False):
        self.filename = filename
        self.materials = {}
        self.comments = {}
        try:
            file = open(filename)
        except:
            return self
        linenumber = 0
        mat = None
        for line in file.readlines():
            line = line.strip()
            linenumber = linenumber + 1
            if not line:
                continue
            if line[0] == '#':
                self.comments[linenumber] = line
                print line
                continue
            tokens = line.split()
            if not tokens:
                continue
            if verbose: print "tokens[0]:", tokens
            if tokens[0] == "newmtl":
                mat = ObjMaterial()
                mat.filename = filename
                mat.name = tokens[1]
                self.materials[mat.name] = mat
                if verbose: print "newmtl:", mat.name
                continue
            if tokens[0] in ("Ns", "d", "Tr"):
                # "d factor" - specifies the dissovle for the current material,
                #              1.0 is full opaque
                # "Ns exponent" - specifies the specular exponent.  A high exponent
                #               results in a tight, concentrated highlight.
                mat.put(tokens[0], float(tokens[1]))
                continue
            if tokens[0] in ("illum"):
                # according to http://www.fileformat.info/format/material/
                # 0 = Color on and Ambient off
                # 1 = Color on and Ambient on
                # 2 = Highlight on
                # 3 = Reflection on and Ray trace on
                # 4 = Transparency: Glass on, Reflection: Ray trace on
                # 5 = Reflection: Fesnel on and Ray trace on
                # 6 = Transparency: Refraction on, Reflection: Fresnel off and Ray trace on
                # 7 = Transparency: Refraction on, Refelction: Fresnel on and Ray Trace on
                # 8 = Reflection on and Ray trace off
                # 9 = Transparency: Glass on, Reflection: Ray trace off
                # 10 = Casts shadows onto invisible surfaces
                mat.put(tokens[0], int(tokens[1]))
                continue
            if tokens[0] in ("Kd", "Ka", "Ks", "Ke"):
                mat.put(tokens[0], floats(tokens[1:]))
                continue
            if tokens[0] in ("map_Kd", "map_Bump", "map_Ks", "map_bump", "bump"):
                # Ultimate Unwrap 3D Pro emits these:
                # map_Kd == diffuse
                # map_Bump == bump
                # map_Ks == specular
                mat.put(tokens[0], pathify(tokens[1]))
                if verbose: print "map:", mat.name, tokens[0], mat.get(tokens[0])
                continue
            if tokens[0] in ("Ni"):
                # blender's .obj exporter can emit this "Ni 1.000000"
                mat.put(tokens[0], float(tokens[1]))
                continue
            print "file \"%s\": line %d: unrecognized:" % (filename, linenumber), tokens
        file.close()
        if verbose: print "%d materials" % len(self.materials), "loaded from", filename
        return self

class ObjFile:
    """a representation of a wavefront .obj file"""
    def __init__(self, filename=None):
        self.filename = None
        self.objects = ["defaultobject"]
        self.groups = ["defaultgroup"]
        self.points = []
        self.uvs = []
        self.normals = []
        self.faces = []
        self.polylines = []
        self.matlibs = []
        self.materialsbyname = {}
        self.comments = {}
        self.currentobject = self.objects[0]
        self.currentgroup = self.groups[0]
        self.currentmaterial = None
        if filename is not None:
            self.read(filename)

    def read(self, filename, verbose=False):
        if verbose: print "ObjFile.read:", "filename:", filename
        self.filename = filename
        self.objects = ["defaultobject"]
        self.groups = ["defaultgroup"]
        self.points = []
        self.uvs = []
        self.normals = []
        self.faces = []
        self.polylines = []
        self.matlibs = []
        self.materialsbyname = {}
        self.comments = {}
        self.currentobject = self.objects[0]
        self.currentgroup = self.groups[0]
        self.currentmaterial = None
        try:
            file = open(filename)
        except:
            return self
        linenumber = 0
        for line in file.readlines():
            line = line.strip()
            linenumber = linenumber + 1
            if not line:
                continue
            if line[0] == '#':
                self.comments[linenumber] = line
                print line
                continue
            tokens = line.split()
            if not tokens:
                continue
            if tokens[0] == "mtllib":
                if verbose: print "mtllib:", tokens[1:]
                mtllib = MtlFile(tokens[1])
                # if verbose: print mtllib
                self.matlibs.append(mtllib)
                self.indexmaterials(mtllib)
                continue
            if tokens[0] == "g":
                if verbose: print "g:", tokens[1:]
                self.__newgroup("".join(tokens[1:]))
                continue
            if tokens[0] == "o":
                if verbose: print "o:", tokens[1:]
                self.__newobject("".join(tokens[1:]))
                continue
            if tokens[0] == "usemtl":
                if verbose: print "usemtl:", tokens[1:]
                self.__usematerial(tokens[1])
                continue
            if tokens[0] == "v":
                if verbose: print "v:", tokens[1:]
                self.__newv(tokens[1:])
                continue
            if tokens[0] == "vn":
                if verbose: print "vn:", tokens[1:]
                self.__newnormal(tokens[1:])
                continue
            if tokens[0] == "vt":
                if verbose: print "vt:", tokens[1:]
                self.__newuv(tokens[1:])
                continue
            if tokens[0] == "f":
                if verbose: print "f:", tokens[1:]
                self.__newface(tokens[1:])
                continue
            if tokens[0] == "s":
                # apparently, this enables/disables smoothing
                print "%s:%d:" % (filename, linenumber), "ignoring:", tokens
                continue
            if tokens[0] == "l":
                if verbose: print "l:", tokens[1:]
                self.__newpolyline(tokens[1:])
                continue
            print "%s:%d:" % (filename, linenumber), "unknown:", tokens
        file.close()
        return self

    def __vertlist(self, lst):
        res = []
        for vert in lst:
            vinfo = vert.split("/")
            vlen = len(vinfo)
            vertex = {'v':None, 'vt':None, 'vn':None}
            if vlen == 1:
                vertex['v'] = int(vinfo[0])
            elif vlen == 2:
                if vinfo[0] != '':
                    vertex['v'] = int(vinfo[0])
                if vinfo[1] != '':
                    vertex['vt'] = int(vinfo[1])
            elif vlen == 3:
                if vinfo[0] != '':
                    vertex['v'] = int(vinfo[0])
                if vinfo[1] != '':
                    vertex['vt'] = int(vinfo[1])
                if vinfo[2] != '':
                    vertex['vn'] = int(vinfo[2])
            else:
                print "aborting..."
                raise UNKNOWN, res
            res.append(vertex)
        if False: print res
        return res

    def __enclose(self, lst):
        mdata = (self.currentobject, self.currentgroup, self.currentmaterial)
        return (lst, mdata)

    def __newpolyline(self, l):
        polyline = self.__vertlist(l)
        if False: print "__newline:", polyline
        self.polylines.append(self.__enclose(polyline))
        return self

    def __newface(self, f):
        face = self.__vertlist(f)
        if False: print face
        self.faces.append(self.__enclose(face))
        return self

    def __newuv(self, uv):
        self.uvs.append(floats(uv))
        return self

    def __newnormal(self, normal):
        self.normals.append(floats(normal))
        return self

    def __newv(self, v):
        # capture the current metadata with vertices
        vdata = floats(v)
        mdata = (self.currentobject, self.currentgroup, self.currentmaterial)
        vinfo = (vdata, mdata)
        self.points.append(vinfo)
        return self

    def indexmaterials(self, mtllib, verbose=False):
        # traverse the materials defined in mtllib, indexing
        # them by name.
        for mname in mtllib.materials:
            mobj = mtllib.materials[mname]
            self.materialsbyname[mobj.name] = mobj
        if verbose: 
            print "indexmaterials:", mtllib.filename, "materials:", self.materialsbyname.keys()
        return self

    def __closeobject(self):
        self.currentobject = "defaultobject"
        return self

    def __newobject(self, object):
        self.__closeobject()
        if False: print "__newobject:", "object:", object
        self.currentobject = object
        self.objects.append(object)
        return self

    def __closegroup(self):
        self.currentgroup = "defaultgroup"
        return self

    def __newgroup(self, group):
        self.__closegroup()
        if False: print "__newgroup:", "group:", group
        self.currentgroup = group
        self.groups.append(group)
        return self

    def __usematerial(self, material):
        if False: print "__usematerial:", "material:", material
        if self.materialsbyname.has_key(material):
            self.currentmaterial = material
        else:
            print "warning:", "__usematerial:", "unknown material:", material
        return self

    def __itemsby(self, itemlist, objname, groupname):
        res = []
        for item in itemlist:
            vlist, mdata = item
            wobj, wgrp, wmat = mdata
            if (wobj == objname) and (wgrp == groupname):
                res.append(item)
        return res

    def __facesby(self, objname, groupname):
        return self.__itemsby(self.faces, objname, groupname)

    def __linesby(self, objname, groupname):
        return self.__itemsby(self.polylines, objname, groupname)

    def __eggifyverts(self, eprim, evpool, vlist):
        for vertex in vlist:
            ixyz = vertex['v']
            vinfo = self.points[ixyz-1]
            vxyz, vmeta = vinfo
            ev = EggVertex()
            ev.setPos(Point3D(vxyz[0], vxyz[1], vxyz[2]))
            iuv = vertex['vt']
            if iuv is not None:
                vuv = self.uvs[iuv-1]
                ev.setUv(Point2D(vuv[0], vuv[1]))
            inormal = vertex['vn']
            if inormal is not None:
                vn = self.normals[inormal-1]
                ev.setNormal(Vec3D(vn[0], vn[1], vn[2]))
            evpool.addVertex(ev)
            eprim.addVertex(ev)
        return self

    def __eggifymats(self, eprim, wmat):
        if self.materialsbyname.has_key(wmat):
            mtl = self.materialsbyname[wmat]
            if mtl.isTextured():
                eprim.setTexture(mtl.getEggTexture())
                # NOTE: it looks like you almost always want to setMaterial()
                #       for textured polys.... [continued below...]
                eprim.setMaterial(mtl.getEggMaterial())
            rgb = mtl.get("Kd")
            if rgb is not None:
                # ... and some untextured .obj's store the color of the
                # material # in the Kd settings...
                eprim.setColor(Vec4(rgb[0], rgb[1], rgb[2], 1.0))
            # [continued...] but you may *not* always want to assign
            # materials to untextured polys...  hmmmm.
            if False:
                eprim.setMaterial(mtl.getEggMaterial())
        return self

    def __facestoegg(self, egg, objname, groupname):
        selectedfaces = self.__facesby(objname, groupname)
        if len(selectedfaces) == 0:
            return self
        eobj = EggGroup(objname)
        egg.addChild(eobj)
        egrp = EggGroup(groupname)
        eobj.addChild(egrp)
        evpool = EggVertexPool(groupname)
        egrp.addChild(evpool)
        for face in selectedfaces:
            vlist, mdata = face
            wobj, wgrp, wmat = mdata
            epoly = EggPolygon()
            egrp.addChild(epoly)
            self.__eggifymats(epoly, wmat)
            self.__eggifyverts(epoly, evpool, vlist)
        #; each matching face
        return self

    def __polylinestoegg(self, egg, objname, groupname):
        selectedlines = self.__linesby(objname, groupname)
        if len(selectedlines) == 0:
            return self
        eobj = EggGroup(objname)
        egg.addChild(eobj)
        egrp = EggGroup(groupname)
        eobj.addChild(egrp)
        evpool = EggVertexPool(groupname)
        egrp.addChild(evpool)
        for line in selectedlines:
            vlist, mdata = line
            wobj, wgrp, wmat = mdata
            eline = EggLine()
            egrp.addChild(eline)
            self.__eggifymats(eline, wmat)
            self.__eggifyverts(eline, evpool, vlist)
        #; each matching line
        return self

    def toEgg(self, verbose=True):
        if verbose: print "converting..."
        # make a new egg
        egg = EggData()
        # convert polygon faces
        if len(self.faces) > 0:
            for objname in self.objects:
                for groupname in self.groups:
                    self.__facestoegg(egg, objname, groupname)
        # convert polylines
        if len(self.polylines) > 0:
            for objname in self.objects:
                for groupname in self.groups:
                    self.__polylinestoegg(egg, objname, groupname)
        return egg

def pathify(path):
    if os.path.isfile(path):
        return path
    # if it was written on win32, it may have \'s in it, and
    # also a full rather than relative pathname (Hexagon does this... ick)
    orig = path
    path = path.lower()
    path = path.replace("\\", "/")
    h, t = os.path.split(path)
    if os.path.isfile(t):
        return t
    print "warning: can't make sense of this map file name:", orig
    return t
    
def main(argv=None):
    if argv is None:
        argv = sys.argv
    try:
        opts, args = getopt.getopt(argv[1:], "hn:bs", ["help", "normals", "binormals", "show"])
    except getopt.error, msg:
        print msg
        print __doc__
        return 2
    show = False
    for o, a in opts:
        if o in ("-h", "--help"):
            print __doc__
            return 0
        elif o in ("-s", "--show"):
            show = True
    for infile in args:
        try:
            if ".obj" not in infile:
                print "WARNING", finfile, "does not look like a valid obj file"
                continue
            obj = ObjFile(infile)
            egg = obj.toEgg()
            f, e = os.path.splitext(infile)
            outfile = f + ".egg"
            for o, a in opts:
                if o in ("-n", "--normals"):
                    egg.recomputeVertexNormals(float(a))
                elif o in ("-b", "--binormals"):
                    egg.recomputeTangentBinormal(GlobPattern(""))
            egg.removeUnusedVertices(GlobPattern(""))
            if True:
                egg.triangulatePolygons(EggData.TConvex & EggData.TPolygon)
            if True:
                egg.recomputePolygonNormals()
            egg.writeEgg(Filename(outfile))
            if show:
                os.system("pview " + outfile)
        except Exception,e:
            print e
    return 0

if __name__ == "__main__":
    sys.exit(main())