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ac3d_import.py

#!BPY

""" Registration info for Blender menus:
Name: 'AC3D (.ac)...'
Blender: 232
Group: 'Import'
Tip: 'Import an AC3D (.ac) file.'
"""

__author__ = "Willian P. Germano"
__url__ = ("blender", "elysiun", "AC3D's homepage, http://www.ac3d.org",
      "PLib 3d gaming lib, http://plib.sf.net")
__version__ = "2.34 07/26/04"

__bpydoc__ = """\
This script imports AC3D models into Blender.

AC3D is a simple and affordable commercial 3d modeller also built with OpenGL.
The .ac file format is an easy to parse text format well supported,
for example, by the PLib 3d gaming library (AC3D v3.x).

Supported:<br>
    UV-textured meshes with hierarchy (grouping) information.

Missing:<br>
    Support for AC3D 4's crease tag (simple, will be added soon).

Known issues:<br>
    None.

Notes:<br>
    Check script's source code for options that can be tweaked (using Blender
empties to emulate AC3D's grouping info and setting a default folder for
textures, for the case of wrong paths in the .ac file(s).
"""

# $Id: ac3d_import.py,v 1.7 2004/11/07 16:31:13 ianwill Exp $
#
# --------------------------------------------------------------------------
# AC3DImport version 2.34 Jul 26, 2004
# Program versions: Blender 2.32+ and AC3Db files (means version 0xb)
# small update to allow a default path for textures, see TEXDIR below.
# --------------------------------------------------------------------------
# ***** BEGIN GPL LICENSE BLOCK *****
#
# Copyright (C) 2004: Willian P. Germano, wgermano _at_ ig.com.br
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
# ***** END GPL LICENCE BLOCK *****
# --------------------------------------------------------------------------

# Note:
# Blender doesn't handle n-gons (polygons with more than 4 vertices):
#   The script triangulates them, but concave polygons come out wrong and need
#   fixing. Avoiding or triangulating concave n-gons in AC3D is a simple way to
#   avoid problems.

# Default folder for AC3D textures, to override wrong paths, change to your
# liking or leave as "":
TEXDIR = ""

# Set 'GROUP' to 1 to make Blender group imported objects using Empties,
# to reproduce the object hierarchy in the .ac file
GROUP = 0

import Blender

if TEXDIR:
    TEXDIR = TEXDIR.replace('\\','/')
    if TEXDIR[-1] != '/': TEXDIR += '/'

errmsg = ""

class Obj:
    
    def __init__(self, type):
        self.type = type
        self.dad = None
        self.name = ''
        self.data = ''
        self.tex = ''
        self.texrep = [1,1]
        self.texoff = None
        self.loc = [0, 0, 0]
        self.rot = []
        self.vlist = []
        self.flist = []
        self.matlist = []
        self.kids = 0

class AC3DImport:

    def __init__(self, filename):

        global errmsg

        print "Trying to import AC3D model(s) from %s ..." % filename

        self.i = 0
        errmsg = ''
        self.importdir = Blender.sys.dirname(filename)
        try:
            file = open(filename, 'r')
        except IOError, (errno, strerror):
            errmsg = "IOError #%s: %s" % (errno, strerror)
            print errmsg
            return None
        header = file.read(5)
        header, version = header[:4], header[-1]
        if header != 'AC3D':
            file.close()
            errmsg = 'Invalid file -- AC3D header not found.'
            print errmsg
            return None
        elif version != 'b':
            print 'AC3D file version 0x%s.' % version
            print 'This importer is for version 0xb, so it may fail.' 

        self.token = {'OBJECT':     self.parse_obj,
                      'numvert':    self.parse_vert,
                      'numsurf':    self.parse_surf,
                      'name':       self.parse_name,
                      'data':       self.parse_data,
                      'kids':       self.parse_kids,
                      'loc':        self.parse_loc,
                      'rot':        self.parse_rot,
                      'MATERIAL':   self.parse_mat,
                      'texture':    self.parse_tex,
                      'texrep':     self.parse_texrep,
                      'texoff':     self.parse_texoff}

        self.objlist = []
        self.mlist = []
        self.dads = []
        self.kids = []
        self.dad = None

        self.lines = file.readlines()
        self.lines.append('')
        self.parse_file()
        file.close()
        
        self.testAC3DImport()
                
    def parse_obj(self, value):
        if self.kids:
            while not self.kids[-1]:
                self.kids.pop()
                self.dad = self.dad.dad
            self.kids[-1] -= 1
        new = Obj(value)
        new.dad = self.dad
        new.name = value
        self.objlist.append(new)

    def parse_kids(self, value):
        kids = int(value)
        if kids:
            self.kids.append(kids)
            self.dad = self.objlist[-1]
        self.objlist[-1].kids = kids

    def parse_name(self, value):
        name = value.split('"')[1]
        self.objlist[-1].name = name

    def parse_data(self, value):
        data = self.lines[self.i].strip()
        self.objlist[-1].data = data

    def parse_tex(self, value):
        texture = value.split('"')[1]
        self.objlist[-1].tex = texture

    def parse_texrep(self, trash):
        trep = self.lines[self.i - 1]
        trep = trep.split()
        trep = [float(trep[1]), float(trep[2])]
        self.objlist[-1].texrep = trep
        self.objlist[-1].texoff = [0, 0]

    def parse_texoff(self, trash):
        toff = self.lines[self.i - 1]
        toff = toff.split()
        toff = [float(toff[1]), float(toff[2])]
        self.objlist[-1].texoff = toff
        
    def parse_mat(self, value):
        i = self.i - 1
        lines = self.lines
        line = lines[i].split()
        mat_name = ''
        mat_col = mat_spec_col = [0,0,0]
        mat_alpha = 1

        while line[0] == 'MATERIAL':
            mat_name = line[1].split('"')[1]
            mat_col = map(float,[line[3],line[4],line[5]])
            mat_spec_col = map(float,[line[15],line[16],line[17]])
            mat_alpha = float(line[-1])
            mat_alpha = 1 - mat_alpha
            self.mlist.append([mat_name, mat_col, mat_spec_col, mat_alpha])
            i += 1
            line = lines[i].split()

        self.i = i

    def parse_rot(self, trash):
        i = self.i - 1
        rot = self.lines[i].split(' ', 1)[1]
        rot = map(float, rot.split())
        self.objlist[-1].rot = rot

    def parse_loc(self, trash):
        i = self.i - 1
        loc = self.lines[i].split(' ', 1)[1]
        loc = map(float, loc.split())
        self.objlist[-1].loc = loc

    def parse_vert(self, value):
        i = self.i
        lines = self.lines
        obj = self.objlist[-1]
        vlist = obj.vlist
        n = int(value)

        while n:
            line = lines[i].split()
            line = map(float, line)
            vlist.append(line)
            n -= 1
            i += 1

        self.i = i

        rot = obj.rot
        if rot:
            nv = len(vlist)
            for j in range(nv):
                v = vlist[j]
                t = [0,0,0]
                t[0] = rot[0]*v[0] + rot[3]*v[1] + rot[6]*v[2]
                t[1] = rot[1]*v[0] + rot[4]*v[1] + rot[7]*v[2]
                t[2] = rot[2]*v[0] + rot[5]*v[1] + rot[8]*v[2]
                vlist[j] = t

        loc = obj.loc
        dad = obj.dad
        while dad:
            for j in [0, 1, 2]:
                loc[j] += dad.loc[j]
            dad = dad.dad

        for v in vlist:
            for j in [0, 1, 2]:
                v[j] += loc[j]

    def parse_surf(self, value):
        i = self.i
        is_smooth = 0
        double_sided = 0
        lines = self.lines
        obj = self.objlist[-1]
        matlist = obj.matlist
        numsurf = int(value)

        while numsurf:
            flags = lines[i].split()
            flaglow = 0
            if len(flags[1]) > 3: flaglow = int(flags[1][3])
            flaghigh = int(flags[1][2])
            is_smooth = flaghigh & 1
            twoside = flaghigh & 2
            mat = lines[i+1].split()
            mat = int(mat[1])
            if not mat in matlist: matlist.append(mat)
            refs = lines[i+2].split()
            refs = int(refs[1])
            i += 3
            face = []
            faces = []
            fuv = []
            rfs = refs

            while rfs:
                line = lines[i].split()
                v = int(line[0])
                uv = [float(line[1]), float(line[2])]
                face.append([v, uv])
                rfs -= 1
                i += 1
                
            if flaglow:
                while len(face) >= 2:
                    cut = face[:2]
                    faces.append(cut)
                    face = face[1:]

                if flaglow == 1:
                    face = [faces[-1][-1], faces[0][0]]
                    faces.append(face)

            else:
                while len(face) > 4:
                    cut = face[:4]
                    face = face[3:]
                    face.insert(0, cut[0])
                    faces.append(cut)        

                faces.append(face)

            for f in faces:
                f.append(mat)
                f.append(is_smooth)
                f.append(twoside)
                self.objlist[-1].flist.append(f)

            numsurf -= 1      

                            
        self.i = i

    def parse_file(self):
        i = 1
        lines = self.lines
        line = lines[i].split()

        while line:
            kw = ''
            for k in self.token.keys():
                if line[0] == k:
                    kw = k
                    break
            i += 1
            if kw:
                self.i = i
                self.token[kw](line[1])
                i = self.i
            line = lines[i].split()

    def testAC3DImport(self):
        global GROUP
        scene = Blender.Scene.GetCurrent()

        bmat = []
        for mat in self.mlist:
            name = mat[0]
            m = Blender.Material.New(name)
            m.rgbCol = (mat[1][0], mat[1][1], mat[1][2])
            m.specCol = (mat[2][0], mat[2][1], mat[2][2])
            m.alpha = mat[3]
            bmat.append(m)

        for obj in self.objlist:
            if obj.type == 'world':
                continue
            elif obj.type == 'group':
                if not GROUP: continue
                empty = Blender.Object.New('Empty')
                empty.name = obj.name
                scene.link(empty)
                if self.dads:
                    dadobj = Blender.Object.get(self.dads.pop())
                    dadobj.makeParent([empty])
                while obj.kids:
                    self.dads.append(empty.name)
                    obj.kids -= 1
                continue
            mesh = Blender.NMesh.New()
            if (obj.data): mesh.name = obj.data
            mesh.hasFaceUV(1)

            tex = None
            if obj.tex != '':
                try:
                    tex = Blender.Image.Load(obj.tex)
                    # Commented because it's unnecessary:
                    #tex.xrep = int(obj.texrep[0])
                    #tex.yrep = int(obj.texrep[1])
                except:
                    basetexname = Blender.sys.basename(obj.tex)
                    try:
                        obj.tex = self.importdir + '/' + basetexname
                        tex = Blender.Image.Load(obj.tex)
                    except:
                        try:
                            obj.tex = TEXDIR + basetexname
                            tex = Blender.Image.Load(obj.tex)
                        except:
                            print "Couldn't load texture: %s" % basetexname

            for v in obj.vlist:
                bvert = Blender.NMesh.Vert(v[0],v[1],v[2])
                mesh.verts.append(bvert)

            objmat_indices = []
            for mat in bmat:
                if bmat.index(mat) in obj.matlist:
                    objmat_indices.append(bmat.index(mat))
                    mesh.materials.append(mat)
            for f in obj.flist:
                twoside = f[-1]
                is_smooth = f[-2]
                fmat = f[-3]
                f=f[:-3]
                bface = Blender.NMesh.Face()
                bface.smooth = is_smooth
                if twoside: bface.mode |= Blender.NMesh.FaceModes['TWOSIDE']
                if tex:
                    bface.mode |= Blender.NMesh.FaceModes['TEX']
                    bface.image = tex
                bface.materialIndex = objmat_indices.index(fmat)
                if obj.texoff:
                    uoff = obj.texoff[0]
                    voff = obj.texoff[1]
                    urep = obj.texrep[0]
                    vrep = obj.texrep[1]
                    for vi in range(len(f)):
                        f[vi][1][0] *= urep
                        f[vi][1][1] *= vrep
                        f[vi][1][0] += uoff
                        f[vi][1][1] += voff

                for vi in range(len(f)):
                    bface.v.append(mesh.verts[f[vi][0]])
                    bface.uv.append((f[vi][1][0], f[vi][1][1]))
                mesh.faces.append(bface)

            mesh.mode = 0
            object = Blender.NMesh.PutRaw(mesh)
            object.setName(obj.name)
            object.setEuler([1.5707963,0,0]) # align ac3d w/ Blender
            if self.dads:
                dadobj = Blender.Object.get(self.dads.pop())
                dadobj.makeParent([object])

        print '...done!'

# End of class AC3DImport

def filesel_callback(filename):
  test = AC3DImport(filename)

Blender.Window.FileSelector(filesel_callback, "Import AC3D", "*.ac")

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