blender/release/scripts/blender2cal3d.py

#!BPY

"""
Name: 'Cal3D Exporter V0.7'
Blender: 234
Group: 'Export'
Tip: 'Export armature/bone data to the Cal3D library.'
"""
# $Id$
#
# Copyright (C) 2003 Jean-Baptiste LAMY -- jiba@tuxfamily.org
# Copyright (C) 2004 Chris Montijin
# Copyright (C) 2004 Damien McGinnes
#
# 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


# This script is a Blender 2.34 => Cal3D 0.7/0.8/0.9 converter.
# (See http://blender.org and http://cal3d.sourceforge.net)
#

# This script was written by Jiba, modified by Chris and later modified by Damien

# Changes:
#
# 0.7 Damien McGinnes <mcginnes at netspeed com au>
#    Added NLA functionality for IPOs - this simplifies
#      the animation export and speeds it up significantly
#      it also removes the constraints on channel names -
#      they no longer have to match the bone or action and
#      .L .R etc are supported
#    bones starting with _ are not exported
#    textures no longer flipped vertically
#    fixed a filename bug for .csf and .cfg
#    actions that are prefixed with '@' go into the cfg file
#      as actions rather than cycles    
#    works with baked IK actions, unbaked ones wont work well
#      because you wont have the constraints evaluated
#    added an FPS slider into the gui
#    added registry saving for gui state. 
#    
# 0.6 Chris Montjin
#    Updated for Blender 2.32, 2.33
#    added basic GUI
#    generally improved flexibility
#
# 0.5 Jiba <jiba@tuxfamily.org>
#    Initial Release for Blender 2.28



# HOW TO USE :
# 1 - load the script in Blender's text editor
# 2 - type M-P (meta/alt + P) and wait until script execution is finished
# or install it in .scripts and access from the export menu

# ADVICE
# - Objects/bones/actions whose names start by "_" are not exported
#   so call IK and null bones _LegIK for example
# - All your armature's exported bones must be connected to another bone (except
#   for the rootbone). Contrary to Blender, Cal3D doesn't support "floating" bones.
# - Actions that start with '@' will be exported as actions, others will be
#   exported as cycles

# BUGS / TODO :
# - Material color is not supported yet
# - Cal3D springs (for clothes and hair) are not supported yet
# - Cal3d has a bug in that a cycle that doesnt have as rootbone channel
#    will segfault cal3d. until cal3d supports this, add a keyframe for the rootbone


# REMARKS
# 1. When you finished an animation and run the script
#    you can get an error (something with KeyError). Just save your work,
#    and reload the model. This is usualy caused by deleted items hanging around
# 2. If a vertex is assigned to one or more bones, but is has a for each
#    bone a weight of zero, there was a subdivision by zero somewhere
#    Made a workaround (if sum is 0.0 then sum becomes 1.0).
#    I have not checked what the outcome of that is, so you better nail 'm,
#    and give it some weight...


# Parameters :

# The directory where the data are saved.
SAVE_TO_DIR = "/tmp/tutorial/"

# Delete all existing Cal3D files in directory?
DELETE_ALL_FILES = 0

# What do you wanna export? If all are true then a .cfg file is created,
# otherwise no .cfg file is made. You have to make one by hand.
EXPORT_SKELETON = 1
EXPORT_ANIMATION = 0
EXPORT_MESH = 1
EXPORT_MATERIAL = 0

# Prefix for all created files
FILE_PREFIX = "Test"

# Remove path from imagelocation
REMOVE_PATH_FROM_IMAGE = 0

# prefix or subdir for imagepathname (if you place your textures in a
# subdir or just need a prefix or something). Only used when
# REMOVE_PATH_FROM_IMAGE = 1. Set to "" if none.
IMAGE_PREFIX = "textures/"

# Export to new (>= 900) Cal3D XML-format
EXPORT_TO_XML = 0

# Set scalefactor for model
SCALE = 0.5

# frames per second - used to convert blender frames to times
FPS = 25

# Use this dictionary to rename animations, as their name is lost at the 
# exportation.
RENAME_ANIMATIONS = {
  # "OldName" : "NewName",
  
  }

# True (=1) to export for the Soya 3D engine 
# (http://oomadness.tuxfamily.org/en/soya).
# (=> rotate meshes and skeletons so as X is right, Y is top and -Z is front)
EXPORT_FOR_SOYA = 0

# See also BASE_MATRIX below, if you want to rotate/scale/translate the model at
# the exportation.


# Enables LODs computation. LODs computation is quite slow, and the algo is 
# surely not optimal :-(
LODS = 0

#remove the word '.BAKED' from exported baked animations
REMOVE_BAKED = 1


################################################################################
# Code starts here.
# The script should be quite re-useable for writing another Blender animation 
# exporter. Most of the hell of it is to deal with Blender's head-tail-roll 
# bone's definition.

import sys, os, os.path, struct, math, string
import Blender
from Blender.BGL import *
from Blender.Draw import *
from Blender.Armature import *
from Blender.Registry import *

# HACK -- it seems that some Blender versions don't define sys.argv,
# which may crash Python if a warning occurs.

if not hasattr(sys, "argv"): sys.argv = ["???"]


# Math stuff

def quaternion2matrix(q):
  xx = q[0] * q[0]
  yy = q[1] * q[1]
  zz = q[2] * q[2]
  xy = q[0] * q[1]
  xz = q[0] * q[2]
  yz = q[1] * q[2]
  wx = q[3] * q[0]
  wy = q[3] * q[1]
  wz = q[3] * q[2]
  return [
    [1.0 - 2.0 * (yy + zz), 2.0 * (xy + wz), 2.0 * (xz - wy), 0.0],
    [2.0 * (xy - wz), 1.0 - 2.0 * (xx + zz), 2.0 * (yz + wx), 0.0],
    [2.0 * (xz + wy), 2.0 * (yz - wx), 1.0 - 2.0 * (xx + yy), 0.0],
    [0.0, 0.0, 0.0, 1.0]
    ]

def matrix2quaternion(m):
  s = math.sqrt(abs(m[0][0] + m[1][1] + m[2][2] + m[3][3]))
  if s == 0.0:
    x = abs(m[2][1] - m[1][2])
    y = abs(m[0][2] - m[2][0])
    z = abs(m[1][0] - m[0][1])
    if   (x >= y) and (x >= z): return 1.0, 0.0, 0.0, 0.0
    elif (y >= x) and (y >= z): return 0.0, 1.0, 0.0, 0.0
    else:                       return 0.0, 0.0, 1.0, 0.0
  return quaternion_normalize([
    -(m[2][1] - m[1][2]) / (2.0 * s),
    -(m[0][2] - m[2][0]) / (2.0 * s),
    -(m[1][0] - m[0][1]) / (2.0 * s),
    0.5 * s,
    ])

def quaternion_normalize(q):
  l = math.sqrt(q[0] * q[0] + q[1] * q[1] + q[2] * q[2] + q[3] * q[3])
  return q[0] / l, q[1] / l, q[2] / l, q[3] / l

def quaternion_multiply(q1, q2):
  r = [
    q2[3] * q1[0] + q2[0] * q1[3] + q2[1] * q1[2] - q2[2] * q1[1],
    q2[3] * q1[1] + q2[1] * q1[3] + q2[2] * q1[0] - q2[0] * q1[2],
    q2[3] * q1[2] + q2[2] * q1[3] + q2[0] * q1[1] - q2[1] * q1[0],
    q2[3] * q1[3] - q2[0] * q1[0] - q2[1] * q1[1] - q2[2] * q1[2],
    ]
  d = math.sqrt(r[0] * r[0] + r[1] * r[1] + r[2] * r[2] + r[3] * r[3])
  if d == 0:
    r[0] = d
    r[1] = d
    r[2] = d
    r[3] = d
  else:
    r[0] /= d
    r[1] /= d
    r[2] /= d
    r[3] /= d
  return r

def matrix_translate(m, v):
  m[3][0] += v[0]
  m[3][1] += v[1]
  m[3][2] += v[2]
  return m

def matrix_multiply(b, a):
  return [ [
    a[0][0] * b[0][0] + a[0][1] * b[1][0] + a[0][2] * b[2][0],
    a[0][0] * b[0][1] + a[0][1] * b[1][1] + a[0][2] * b[2][1],
    a[0][0] * b[0][2] + a[0][1] * b[1][2] + a[0][2] * b[2][2],
    0.0,
    ], [
    a[1][0] * b[0][0] + a[1][1] * b[1][0] + a[1][2] * b[2][0],
    a[1][0] * b[0][1] + a[1][1] * b[1][1] + a[1][2] * b[2][1],
    a[1][0] * b[0][2] + a[1][1] * b[1][2] + a[1][2] * b[2][2],
    0.0,
    ], [
    a[2][0] * b[0][0] + a[2][1] * b[1][0] + a[2][2] * b[2][0],
    a[2][0] * b[0][1] + a[2][1] * b[1][1] + a[2][2] * b[2][1],
    a[2][0] * b[0][2] + a[2][1] * b[1][2] + a[2][2] * b[2][2],
     0.0,
    ], [
    a[3][0] * b[0][0] + a[3][1] * b[1][0] + a[3][2] * b[2][0] + b[3][0],
    a[3][0] * b[0][1] + a[3][1] * b[1][1] + a[3][2] * b[2][1] + b[3][1],
    a[3][0] * b[0][2] + a[3][1] * b[1][2] + a[3][2] * b[2][2] + b[3][2],
    1.0,
    ] ]

def matrix_invert(m):
  det = (m[0][0] * (m[1][1] * m[2][2] - m[2][1] * m[1][2])
       - m[1][0] * (m[0][1] * m[2][2] - m[2][1] * m[0][2])
       + m[2][0] * (m[0][1] * m[1][2] - m[1][1] * m[0][2]))
  if det == 0.0: return None
  det = 1.0 / det
  r = [ [
      det * (m[1][1] * m[2][2] - m[2][1] * m[1][2]),
    - det * (m[0][1] * m[2][2] - m[2][1] * m[0][2]),
      det * (m[0][1] * m[1][2] - m[1][1] * m[0][2]),
      0.0,
    ], [
    - det * (m[1][0] * m[2][2] - m[2][0] * m[1][2]),
      det * (m[0][0] * m[2][2] - m[2][0] * m[0][2]),
    - det * (m[0][0] * m[1][2] - m[1][0] * m[0][2]),
      0.0
    ], [
      det * (m[1][0] * m[2][1] - m[2][0] * m[1][1]),
    - det * (m[0][0] * m[2][1] - m[2][0] * m[0][1]),
      det * (m[0][0] * m[1][1] - m[1][0] * m[0][1]),
      0.0,
    ] ]
  r.append([
    -(m[3][0] * r[0][0] + m[3][1] * r[1][0] + m[3][2] * r[2][0]),
    -(m[3][0] * r[0][1] + m[3][1] * r[1][1] + m[3][2] * r[2][1]),
    -(m[3][0] * r[0][2] + m[3][1] * r[1][2] + m[3][2] * r[2][2]),
    1.0,
    ])
  return r

def matrix_rotate_x(angle):
  cos = math.cos(angle)
  sin = math.sin(angle)
  return [
    [1.0,  0.0, 0.0, 0.0],
    [0.0,  cos, sin, 0.0],
    [0.0, -sin, cos, 0.0],
    [0.0,  0.0, 0.0, 1.0],
    ]

def matrix_rotate_y(angle):
  cos = math.cos(angle)
  sin = math.sin(angle)
  return [
    [cos, 0.0, -sin, 0.0],
    [0.0, 1.0,  0.0, 0.0],
    [sin, 0.0,  cos, 0.0],
    [0.0, 0.0,  0.0, 1.0],
    ]

def matrix_rotate_z(angle):
  cos = math.cos(angle)
  sin = math.sin(angle)
  return [
    [ cos, sin, 0.0, 0.0],
    [-sin, cos, 0.0, 0.0],
    [ 0.0, 0.0, 1.0, 0.0],
    [ 0.0, 0.0, 0.0, 1.0],
    ]

def matrix_rotate(axis, angle):
  vx  = axis[0]
  vy  = axis[1]
  vz  = axis[2]
  vx2 = vx * vx
  vy2 = vy * vy
  vz2 = vz * vz
  cos = math.cos(angle)
  sin = math.sin(angle)
  co1 = 1.0 - cos
  return [
    [vx2 * co1 + cos, vx * vy * co1 + vz * sin, vz * vx * co1 - vy * sin, 0.0],
    [vx * vy * co1 - vz * sin, vy2 * co1 + cos, vy * vz * co1 + vx * sin, 0.0],
    [vz * vx * co1 + vy * sin, vy * vz * co1 - vx * sin, vz2 * co1 + cos, 0.0],
    [0.0, 0.0, 0.0, 1.0],
    ]

def matrix_scale(fx, fy, fz):
  return [
    [ fx, 0.0, 0.0, 0.0],
    [0.0,  fy, 0.0, 0.0],
    [0.0, 0.0,  fz, 0.0],
    [0.0, 0.0, 0.0, 1.0],
    ]
  
def point_by_matrix(p, m):
  return [p[0] * m[0][0] + p[1] * m[1][0] + p[2] * m[2][0] + m[3][0],
          p[0] * m[0][1] + p[1] * m[1][1] + p[2] * m[2][1] + m[3][1],
          p[0] * m[0][2] + p[1] * m[1][2] + p[2] * m[2][2] + m[3][2]]

def point_distance(p1, p2):
  return math.sqrt((p2[0] - p1[0]) ** 2 + \
         (p2[1] - p1[1]) ** 2 + (p2[2] - p1[2]) ** 2)

def vector_by_matrix(p, m):
  return [p[0] * m[0][0] + p[1] * m[1][0] + p[2] * m[2][0],
          p[0] * m[0][1] + p[1] * m[1][1] + p[2] * m[2][1],
          p[0] * m[0][2] + p[1] * m[1][2] + p[2] * m[2][2]]

def vector_length(v):
  return math.sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2])

def vector_normalize(v):
  l = math.sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2])
  return v[0] / l, v[1] / l, v[2] / l

def vector_dotproduct(v1, v2):
  return v1[0] * v2[0] + v1[1] * v2[1] + v1[2] * v2[2]

def vector_crossproduct(v1, v2):
  return [
    v1[1] * v2[2] - v1[2] * v2[1],
    v1[2] * v2[0] - v1[0] * v2[2],
    v1[0] * v2[1] - v1[1] * v2[0],
    ]

def vector_angle(v1, v2):
  s = vector_length(v1) * vector_length(v2)
  f = vector_dotproduct(v1, v2) / s
  if f >=  1.0: return 0.0
  if f <= -1.0: return math.pi / 2.0
  return math.atan(-f / math.sqrt(1.0 - f * f)) + math.pi / 2.0

def blender_bone2matrix(head, tail, roll):
  # Convert bone rest state (defined by bone.head, bone.tail and bone.roll)
  # to a matrix (the more standard notation).
  # Taken from blenkernel/intern/armature.c in Blender source.
  # See also DNA_armature_types.h:47.
  
  target = [0.0, 1.0, 0.0]
  delta  = [tail[0] - head[0], tail[1] - head[1], tail[2] - head[2]]
  nor    = vector_normalize(delta)
  axis   = vector_crossproduct(target, nor)
  
  if vector_dotproduct(axis, axis) > 0.0000000000001:
    axis    = vector_normalize(axis)
    theta   = math.acos(vector_dotproduct(target, nor))
    bMatrix = matrix_rotate(axis, theta)
    
  else:
    if vector_crossproduct(target, nor) > 0.0: updown =  1.0
    else:                                      updown = -1.0
    
    # Quoted from Blender source : "I think this should work ..."
    bMatrix = [
      [updown, 0.0, 0.0, 0.0],
      [0.0, updown, 0.0, 0.0],
      [0.0, 0.0, 1.0, 0.0],
      [0.0, 0.0, 0.0, 1.0],
      ]
  
  rMatrix = matrix_rotate(nor, roll)
  return matrix_multiply(rMatrix, bMatrix)


# Cal3D data structures

CAL3D_VERSION = 700
CAL3D_XML_VERSION = 900

NEXT_MATERIAL_ID = 0
class Material:
  def __init__(self, map_filename = None):
    self.ambient_r = 255
    self.ambient_g = 255
    self.ambient_b = 255
    self.ambient_a = 255
    self.diffuse_r = 255
    self.diffuse_g = 255
    self.diffuse_b = 255
    self.diffuse_a = 255
    self.specular_r = 255
    self.specular_g = 255
    self.specular_b = 255
    self.specular_a = 255
    self.shininess = 1.0
    if map_filename:
      self.maps_filenames = [map_filename]
    else:
      self.maps_filenames = []
    
    MATERIALS[map_filename] = self
    
    global NEXT_MATERIAL_ID
    self.id = NEXT_MATERIAL_ID
    NEXT_MATERIAL_ID += 1
    
  def to_cal3d(self):
    s = "CRF\0" + struct.pack("iBBBBBBBBBBBBfi", CAL3D_VERSION,
      self.ambient_r, self.ambient_g, self.ambient_b, self.ambient_a,
      self.diffuse_r, self.diffuse_g, self.diffuse_b, self.diffuse_a,
      self.specular_r, self.specular_g, self.specular_b, self.specular_a,
      self.shininess, len(self.maps_filenames))
    for map_filename in self.maps_filenames:
      s += struct.pack("i", len(map_filename) + 1)
      s += map_filename + "\0"
    return s
  
  def to_cal3d_xml(self):
    s = "<HEADER MAGIC=\"XRF\" VERSION=\"%i\"/>\n" % CAL3D_XML_VERSION
    s += "  <MATERIAL NUMMAPS=\"%i\">\n" % len(self.maps_filenames)
    s += "  <AMBIENT>%f %f %f %f</AMBIENT>\n" % \
         (self.ambient_r, self.ambient_g, self.ambient_b, self.ambient_a)   
    s += "  <DIFFUSE>%f %f %f %f</DIFFUSE>\n" % \
         (self.diffuse_r, self.diffuse_g, self.diffuse_b, self.diffuse_a)
    s += "  <SPECULAR>%f %f %f %f</SPECULAR>\n" % \
         (self.specular_r, self.specular_g, self.specular_b, self.specular_a)
    s += "  <SHININESS>%f</SHININESS>\n" % self.shininess
    for map_filename in self.maps_filenames:
      s += "  <MAP>%s</MAP>\n" % map_filename
    s += "</MATERIAL>\n"
    return s
  
MATERIALS = {}

class Mesh:
  def __init__(self, name):
    self.name = name
    self.submeshes = []
    
    self.next_submesh_id = 0
    
  def to_cal3d(self):
    s = "CMF\0" + struct.pack("ii", CAL3D_VERSION, len(self.submeshes))
    s += "".join(map(SubMesh.to_cal3d, self.submeshes))
    return s
  
  def to_cal3d_xml(self):
    s = "<HEADER MAGIC=\"XMF\" VERSION=\"%i\"/>\n" % CAL3D_XML_VERSION
    s += "<MESH NUMSUBMESH=\"%i\">\n" % len(self.submeshes)
    s += "".join(map(SubMesh.to_cal3d_xml, self.submeshes))
    s += "</MESH>\n"
    return s
  
class SubMesh:
  def __init__(self, mesh, material):
    self.material = material
    self.vertices = []
    self.faces = []
    self.nb_lodsteps = 0
    self.springs = []
    
    self.next_vertex_id = 0
    
    self.mesh = mesh
    self.id = mesh.next_submesh_id
    mesh.next_submesh_id += 1
    mesh.submeshes.append(self)
    
  def compute_lods(self):
    """Computes LODs info for Cal3D (there's no Blender related stuff here)."""
    
    print "Start LODs computation..."
    vertex2faces = {}
    for face in self.faces:
      for vertex in (face.vertex1, face.vertex2, face.vertex3):
        l = vertex2faces.get(vertex)
        if not l:
          vertex2faces[vertex] = [face]
        else:
          l.append(face)
        
    couple_treated = {}
    couple_collapse_factor = []
    for face in self.faces:
      for a, b in ((face.vertex1, face.vertex2), (face.vertex1, face.vertex3),
                  (face.vertex2, face.vertex3)):
        a = a.cloned_from or a
        b = b.cloned_from or b
        if a.id > b.id:
          a, b = b, a
        if not couple_treated.has_key((a, b)):
          # The collapse factor is simply the distance between the 2 points :-(
          # This should be improved !!
          if vector_dotproduct(a.normal, b.normal) < 0.9:
            continue
          couple_collapse_factor.append((point_distance(a.loc, b.loc), a, b))
          couple_treated[a, b] = 1
      
    couple_collapse_factor.sort()
    
    collapsed = {}
    new_vertices = []
    new_faces = []
    for factor, v1, v2 in couple_collapse_factor:
      # Determines if v1 collapses to v2 or v2 to v1.
      # We choose to keep the vertex which is on the 
      # smaller number of faces, since
      # this one has more chance of being in an extrimity of the body.
      # Though heuristic, this rule yields very good results in practice.
      if len(vertex2faces[v1]) <  len(vertex2faces[v2]):
        v2, v1 = v1, v2
      elif len(vertex2faces[v1]) == len(vertex2faces[v2]):
        if collapsed.get(v1, 0): v2, v1 = v1, v2 # v1 already collapsed, try v2
        
      if (not collapsed.get(v1, 0)) and (not collapsed.get(v2, 0)):
        collapsed[v1] = 1
        collapsed[v2] = 1
        
        # Check if v2 is already collapsed
        while v2.collapse_to:
          v2 = v2.collapse_to
        
        common_faces = filter(vertex2faces[v1].__contains__, vertex2faces[v2])
        
        v1.collapse_to = v2
        v1.face_collapse_count = len(common_faces)
        
        for clone in v1.clones:
          # Find the clone of v2 that correspond to this clone of v1
          possibles = []
          for face in vertex2faces[clone]:
            possibles.append(face.vertex1)
            possibles.append(face.vertex2)
            possibles.append(face.vertex3)
          clone.collapse_to = v2
          for vertex in v2.clones:
            if vertex in possibles:
              clone.collapse_to = vertex
              break
            
          clone.face_collapse_count = 0
          new_vertices.append(clone)

        # HACK -- all faces get collapsed with v1 
        # (and no faces are collapsed with v1's
        # clones). This is why we add v1 in new_vertices after v1's clones.
        # This hack has no other incidence that consuming 
        # a little few memory for the
        # extra faces if some v1's clone are collapsed but v1 is not.
        new_vertices.append(v1)
        
        self.nb_lodsteps += 1 + len(v1.clones)
        
        new_faces.extend(common_faces)
        for face in common_faces:
          face.can_collapse = 1
          
          # Updates vertex2faces
          vertex2faces[face.vertex1].remove(face)
          vertex2faces[face.vertex2].remove(face)
          vertex2faces[face.vertex3].remove(face)
        vertex2faces[v2].extend(vertex2faces[v1])
        
    new_vertices.extend(filter(lambda vertex: not vertex.collapse_to, 
      self.vertices))
    new_vertices.reverse() # Cal3D want LODed vertices at the end
    for i in range(len(new_vertices)): new_vertices[i].id = i
    self.vertices = new_vertices
    
    new_faces.extend(filter(lambda face: not face.can_collapse, self.faces))
    new_faces.reverse() # Cal3D want LODed faces at the end
    self.faces = new_faces
    
    print "LODs computed : %s vertices can be removed (from a total of %s)." % \
          (self.nb_lodsteps, len(self.vertices))
    
  def rename_vertices(self, new_vertices):
    """Rename (change ID) of all vertices, such as self.vertices == 
       new_vertices.
    """
    for i in range(len(new_vertices)):
      new_vertices[i].id = i
    self.vertices = new_vertices
    
  def to_cal3d(self):
    s =  struct.pack("iiiiii", self.material.id, len(self.vertices), 
         len(self.faces), self.nb_lodsteps, len(self.springs),
         len(self.material.maps_filenames))
    s += "".join(map(Vertex.to_cal3d, self.vertices))
    s += "".join(map(Spring.to_cal3d, self.springs))
    s += "".join(map(Face.to_cal3d, self.faces))
    return s

  def to_cal3d_xml(self):
    s = "  <SUBMESH NUMVERTICES=\"%i\" NUMFACES=\"%i\" MATERIAL=\"%i\" " % \
        (len(self.vertices), len(self.faces), self.material.id)
    s += "NUMLODSTEPS=\"%i\" NUMSPRINGS=\"%i\" NUMTEXCOORDS=\"%i\">\n" % \
         (self.nb_lodsteps, len(self.springs),
         len(self.material.maps_filenames))
    s += "".join(map(Vertex.to_cal3d_xml, self.vertices))
    s += "".join(map(Spring.to_cal3d_xml, self.springs))
    s += "".join(map(Face.to_cal3d_xml, self.faces))
    s += "  </SUBMESH>\n"
    return s

class Vertex:
  def __init__(self, submesh, loc, normal):
    self.loc = loc
    self.normal = normal
    self.collapse_to = None
    self.face_collapse_count = 0
    self.maps = []
    self.influences = []
    self.weight = None
    
    self.cloned_from = None
    self.clones = []
    
    self.submesh = submesh
    self.id = submesh.next_vertex_id
    submesh.next_vertex_id += 1
    submesh.vertices.append(self)
    
  def to_cal3d(self):
    if self.collapse_to:
      collapse_id = self.collapse_to.id
    else:
      collapse_id = -1
    s = struct.pack("ffffffii", self.loc[0], self.loc[1], self.loc[2], 
        self.normal[0], self.normal[1], self.normal[2], collapse_id,
        self.face_collapse_count)
    s += "".join(map(Map.to_cal3d, self.maps))
    s += struct.pack("i", len(self.influences))
    s += "".join(map(Influence.to_cal3d, self.influences))
    if not self.weight is None:
      s += struct.pack("f", len(self.weight))
    return s
  
  def to_cal3d_xml(self):
    if self.collapse_to:
      collapse_id = self.collapse_to.id
    else:
      collapse_id = -1
    s = "    <VERTEX ID=\"%i\" NUMINFLUENCES=\"%i\">\n" % \
        (self.id, len(self.influences))
    s += "      <POS>%f %f %f</POS>\n" % (self.loc[0], self.loc[1], self.loc[2])
    s += "      <NORM>%f %f %f</NORM>\n" % \
         (self.normal[0], self.normal[1], self.normal[2])
    if collapse_id != -1:
      s += "      <COLLAPSEID>%i</COLLAPSEID>\n" % collapse_id
      s += "      <COLLAPSECOUNT>%i</COLLAPSECOUNT>\n" % \
           self.face_collapse_count
    s += "".join(map(Map.to_cal3d_xml, self.maps))
    s += "".join(map(Influence.to_cal3d_xml, self.influences))
    if not self.weight is None:
      s += "      <PHYSIQUE>%f</PHYSIQUE>\n" % len(self.weight)
    s += "    </VERTEX>\n"
    return s
  
class Map:
  def __init__(self, u, v):
    self.u = u
    self.v = v
    
  def to_cal3d(self):
    return struct.pack("ff", self.u, self.v)
    
  def to_cal3d_xml(self):
    return "      <TEXCOORD>%f %f</TEXCOORD>\n" % (self.u, self.v)
    
class Influence:
  def __init__(self, bone, weight):
    self.bone = bone
    self.weight = weight
    
  def to_cal3d(self):
    return struct.pack("if", self.bone.id, self.weight)
    
  def to_cal3d_xml(self):
    return "      <INFLUENCE ID=\"%i\">%f</INFLUENCE>\n" % \
           (self.bone.id, self.weight)
    
class Spring:
  def __init__(self, vertex1, vertex2):
    self.vertex1 = vertex1
    self.vertex2 = vertex2
    self.spring_coefficient = 0.0
    self.idlelength = 0.0
    
  def to_cal3d(self):
    return struct.pack("iiff", self.vertex1.id, self.vertex2.id,
           self.spring_coefficient, self.idlelength)

  def to_cal3d_xml(self):
    return "    <SPRING VERTEXID=\"%i %i\" COEF=\"%f\" LENGTH=\"%f\"/>\n" % \
           (self.vertex1.id, self.vertex2.id, self.spring_coefficient,
           self.idlelength)

class Face:
  def __init__(self, submesh, vertex1, vertex2, vertex3):
    self.vertex1 = vertex1
    self.vertex2 = vertex2
    self.vertex3 = vertex3
    
    self.can_collapse = 0
    
    self.submesh = submesh
    submesh.faces.append(self)
    
  def to_cal3d(self):
    return struct.pack("iii", self.vertex1.id, self.vertex2.id, self.vertex3.id)
    
  def to_cal3d_xml(self):
    return "    <FACE VERTEXID=\"%i %i %i\"/>\n" % \
           (self.vertex1.id, self.vertex2.id, self.vertex3.id)
    
class Skeleton:
  def __init__(self):
    self.bones = []
    
    self.next_bone_id = 0
    
  def to_cal3d(self):
    s = "CSF\0" + struct.pack("ii", CAL3D_VERSION, len(self.bones))
    s += "".join(map(Bone.to_cal3d, self.bones))
    return s

  def to_cal3d_xml(self):
    s = "<HEADER MAGIC=\"XSF\" VERSION=\"%i\"/>\n" % CAL3D_XML_VERSION
    s += "<SKELETON NUMBONES=\"%i\">\n" % len(self.bones)
    s += "".join(map(Bone.to_cal3d_xml, self.bones))
    s += "</SKELETON>\n"
    return s

BONES = {}

class Bone:
  def __init__(self, skeleton, parent, name, loc, rot):
    self.parent = parent
    self.name = name
    self.loc = loc
    self.rot = rot
    self.children = []
    
    self.matrix = matrix_translate(quaternion2matrix(rot), loc)
    if parent:
      self.matrix = matrix_multiply(parent.matrix, self.matrix)
      parent.children.append(self)
    
    # lloc and lrot are the bone => model space transformation 
    # (translation and rotation). They are probably specific to Cal3D.
    m = matrix_invert(self.matrix)
    self.lloc = m[3][0], m[3][1], m[3][2]
    self.lrot = matrix2quaternion(m)
    
    self.skeleton = skeleton
    self.id = skeleton.next_bone_id
    skeleton.next_bone_id += 1
    skeleton.bones.append(self)
    
    BONES[name] = self
    
  def to_cal3d(self):
    s = struct.pack("i", len(self.name) + 1) + self.name + "\0"
    
    # We need to negate quaternion W value, but why ?
    s += struct.pack("ffffffffffffff", self.loc[0], self.loc[1], self.loc[2],
         self.rot[0], self.rot[1], self.rot[2], -self.rot[3],
         self.lloc[0], self.lloc[1], self.lloc[2],
         self.lrot[0], self.lrot[1], self.lrot[2], -self.lrot[3])
    if self.parent:
      s += struct.pack("i", self.parent.id)
    else:
      s += struct.pack("i", -1)
    s += struct.pack("i", len(self.children))
    s += "".join(map(lambda bone: struct.pack("i", bone.id), self.children))
    return s
  
  def to_cal3d_xml(self):
    s = "  <BONE ID=\"%i\" NAME=\"%s\" NUMCHILDS=\"%i\">\n" % \
        (self.id, self.name, len(self.children))
    # We need to negate quaternion W value, but why ?
    s += "    <TRANSLATION>%f %f %f</TRANSLATION>\n" % \
         (self.loc[0], self.loc[1], self.loc[2])
    s += "    <ROTATION>%f %f %f %f</ROTATION>\n" % \
         (self.rot[0], self.rot[1], self.rot[2], -self.rot[3])
    s += "    <LOCALTRANSLATION>%f %f %f</LOCALTRANSLATION>\n" % \
         (self.lloc[0], self.lloc[1], self.lloc[2])
    s += "    <LOCALROTATION>%f %f %f %f</LOCALROTATION>\n" % \
         (self.lrot[0], self.lrot[1], self.lrot[2], -self.lrot[3])
    if self.parent:
      s += "    <PARENTID>%i</PARENTID>\n" % self.parent.id
    else:
      s += "    <PARENTID>%i</PARENTID>\n" % -1
    s += "".join(map(lambda bone: "    <CHILDID>%i</CHILDID>\n" % bone.id,
         self.children))
    s += "  </BONE>\n"
    return s
  
class Animation:
  def __init__(self, name, action, duration = 0.0):
    self.name = name
    self.action = action
    self.duration = duration
    self.tracks = {} # Map bone names to tracks
    
  def to_cal3d(self):
    s = "CAF\0" + struct.pack("ifi", 
        CAL3D_VERSION, self.duration, len(self.tracks))
    s += "".join(map(Track.to_cal3d, self.tracks.values()))
    return s
    
  def to_cal3d_xml(self):
    s = "<HEADER MAGIC=\"XAF\" VERSION=\"%i\"/>\n" % CAL3D_XML_VERSION
    s += "<ANIMATION DURATION=\"%f\" NUMTRACKS=\"%i\">\n" % \
         (self.duration, len(self.tracks))
    s += "".join(map(Track.to_cal3d_xml, self.tracks.values()))
    s += "</ANIMATION>\n"
    return s
    
class Track:
  def __init__(self, animation, bone):
    self.bone = bone
    self.keyframes = []
    
    self.animation = animation
    animation.tracks[bone.name] = self
    
  def to_cal3d(self):
    s = struct.pack("ii", self.bone.id, len(self.keyframes))
    s += "".join(map(KeyFrame.to_cal3d, self.keyframes))
    return s
    
  def to_cal3d_xml(self):
    s = "  <TRACK BONEID=\"%i\" NUMKEYFRAMES=\"%i\">\n" % \
        (self.bone.id, len(self.keyframes))
    s += "".join(map(KeyFrame.to_cal3d_xml, self.keyframes))
    s += "  </TRACK>\n"
    return s
    
class KeyFrame:
  def __init__(self, track, time, loc, rot):
    self.time = time
    self.loc = loc
    self.rot = rot
    
    self.track = track
    track.keyframes.append(self)
    
  def to_cal3d(self):
    # We need to negate quaternion W value, but why ?
    return struct.pack("ffffffff", self.time, self.loc[0], self.loc[1], 
           self.loc[2], self.rot[0], self.rot[1], self.rot[2], -self.rot[3])

  def to_cal3d_xml(self):
    s = "    <KEYFRAME TIME=\"%f\">\n" % self.time
    s += "      <TRANSLATION>%f %f %f</TRANSLATION>\n" % \
         (self.loc[0], self.loc[1], self.loc[2])
    # We need to negate quaternion W value, but why ?
    s += "      <ROTATION>%f %f %f %f</ROTATION>\n" % \
         (self.rot[0], self.rot[1], self.rot[2], -self.rot[3])
    s += "    </KEYFRAME>\n"
    return s


def export():
  global STATUS
  STATUS = "Start export..."
  Draw()

  # Hack for having the model rotated right.
  # Put in BASE_MATRIX your own rotation if you need some.

  if EXPORT_FOR_SOYA:
    BASE_MATRIX = matrix_rotate_x(-math.pi / 2.0)
  else:
    BASE_MATRIX = None

  # Get the scene
  
  scene = Blender.Scene.getCurrent()
  
  
  # Export skeleton (=armature)
  
  STATUS = "Calculate skeleton"
  Draw()

  skeleton = Skeleton()
  
  for obj in Blender.Object.Get():
    data = obj.getData()
    if type(data) is Blender.Types.ArmatureType:
      matrix = obj.getMatrix()
      if BASE_MATRIX: matrix = matrix_multiply(BASE_MATRIX, matrix)
      
      def treat_bone(b, parent = None):
        #skip bones that start with _
        #also skips children of that bone so be careful
        if b.getName()[0] == '_' : return
        head = b.getHead()
        tail = b.getTail()
        
        # Turns the Blender's head-tail-roll notation into a quaternion
        quat = matrix2quaternion(blender_bone2matrix(head, tail, b.getRoll()))
        
        if parent:
          # Compute the translation from the parent bone's head to the child
          # bone's head, in the parent bone coordinate system.
          # The translation is parent_tail - parent_head + child_head,
          # but parent_tail and parent_head must be converted from the parent's
          # parent system coordinate into the parent system coordinate.
          
          parent_invert_transform = matrix_invert(quaternion2matrix(parent.rot))
          parent_head = vector_by_matrix(parent.head, parent_invert_transform)
          parent_tail = vector_by_matrix(parent.tail, parent_invert_transform)
          
          bone = Bone(skeleton, parent, b.getName(), 
                 [parent_tail[0] - parent_head[0] + head[0], 
                  parent_tail[1] - parent_head[1] + head[1],
                  parent_tail[2] - parent_head[2] + head[2]], quat)
        else:
          # Apply the armature's matrix to the root bones
          head = point_by_matrix(head, matrix)
          tail = point_by_matrix(tail, matrix)
          quat = matrix2quaternion(matrix_multiply(matrix, 
                 quaternion2matrix(quat))) # Probably not optimal
          
          # Here, the translation is simply the head vector
          bone = Bone(skeleton, parent, b.getName(), head, quat)
          
        bone.head = head
        bone.tail = tail
        
        for child in b.getChildren():
          treat_bone(child, bone)
        
      for b in data.getBones():
        # treat this bone if not already treated as a child bone
        if not BONES.has_key(b.getName()):
        	treat_bone(b)
      
      # Only one armature / skeleton
      break
    
    
  # Export Mesh data
  
  if EXPORT_MESH or EXPORT_MATERIAL:

      STATUS = "Calculate mesh and materials"
      Draw()

      meshes = []
      
      for obj in Blender.Object.Get():
        data = obj.getData()
        if (type(data) is Blender.Types.NMeshType) and data.faces and EXPORT_MESH:
          mesh = Mesh(obj.name)

          if mesh.name[0] == '_' :
              print "skipping object ", mesh.name
              continue

          meshes.append(mesh)
          
          matrix = obj.getMatrix()
          if BASE_MATRIX:
            matrix = matrix_multiply(BASE_MATRIX, matrix)
          
          faces = data.faces
          while faces:
            image = faces[0].image
            image_filename = image and image.filename
            # for windows
            image_filename_t = str(image_filename)
            #print image_filename_t
            # end for windows
            if REMOVE_PATH_FROM_IMAGE:
              if image_filename_t == "None":
                print "Something wrong with material (is none), set name to none..."
                image_file = "none.tga"
              else:
                # for windows
                if image_filename_t[0] == "/":
                  tmplist = image_filename_t.split("/")
                else:
                  tmplist = image_filename_t.split("\\")
                #print "tmplist: " + repr(tmplist)
                image_file = IMAGE_PREFIX + tmplist[-1]          
                # end for windows
                # for linux
                # image_file = IMAGE_PREFIX + os.path.basename(image_filename)
            else:
              image_file = image_filename
            material = MATERIALS.get(image_file) or Material(image_file)
            
            # TODO add material color support here
            
            submesh = SubMesh(mesh, material)
            vertices = {}
            for face in faces[:]:
              if (face.image and face.image.filename) == image_filename:
                faces.remove(face)
                
                if not face.smooth:
                  #if len(face.v) < 3 :
                  #   print "mesh contains a dodgy face, skipping it"
                  #   continue
                  p1 = face.v[0].co
                  p2 = face.v[1].co
                  p3 = face.v[2].co
                  normal = vector_normalize(vector_by_matrix(vector_crossproduct(
                    [p3[0] - p2[0], p3[1] - p2[1], p3[2] - p2[2]],
                    [p1[0] - p2[0], p1[1] - p2[1], p1[2] - p2[2]],
                    ), matrix))
                  
                face_vertices = []
                for i in range(len(face.v)):
                  vertex = vertices.get(face.v[i].index)
                  if not vertex:
                    coord = point_by_matrix (face.v[i].co, matrix)
                    if face.smooth:
                      normal = vector_normalize(vector_by_matrix(face.v[i].no, 
                               matrix))
                    vertex = vertices[face.v[i].index] = Vertex(submesh, coord, 
                             normal)
                    
                    influences = data.getVertexInfluences(face.v[i].index)
                    if not influences:
                      print "Warning: vertex %i (%i) has no influence !" % \
                            (face.v[i].index, face.v[i].sel)
                    
                    # sum of influences is not always 1.0 in Blender ?!?!
                    sum = 0.0
                    for bone_name, weight in influences:
                      sum += weight
                    
                    # Select vertex with no weight at all (sum = 0.0).
                    # To find out which one it is, select part of vertices in mesh,
                    # exit editmode and see if value between brackets is 1. If so,
                    # the vertex is in selection. You can narrow the selection
                    # this way, to find the offending vertex...
                    if sum == 0.0:
                      print "Warning: vertex %i in mesh %s (selected: %i) has influence sum of 0.0!" % \
                            (face.v[i].index, mesh.name, face.v[i].sel)
                      print "Set the sum to 1.0, otherwise there will " + \
                            "be a division by zero. Better find the offending " + \
                            "vertex..."
                      # face.v[i].sel = 1 # does not work???
                      sum = 1.0
                    if face.v[i].sel:
                      print "Vertex %i is selected" % (face.v[i].index)

                    for bone_name, weight in influences:
                      #print "bone: %s, weight: %f, sum: %f" % (bone_name, weight, sum)
                      vertex.influences.append(Influence(BONES[bone_name], 
                                               weight / sum))
                      
                  elif not face.smooth:
                    # We cannot share vertex for non-smooth faces, 
                    # since Cal3D does not support vertex sharing 
                    # for 2 vertices with different normals.
                    # => we must clone the vertex.
                    
                    old_vertex = vertex
                    vertex = Vertex(submesh, vertex.loc, normal)
                    vertex.cloned_from = old_vertex
                    vertex.influences = old_vertex.influences
                    old_vertex.clones.append(vertex)
                    
                  if data.hasFaceUV():
                    uv = [face.uv[i][0], face.uv[i][1]] #1.0 - face.uv[i][1]]
                    if not vertex.maps:
                      vertex.maps.append(Map(*uv))
                    elif (vertex.maps[0].u != uv[0]) or (vertex.maps[0].v != uv[1]):
                      # This vertex can be shared for Blender, but not for Cal3D !!!
                      # Cal3D does not support vertex sharing for 2 vertices with
                      # different UV texture coodinates.
                      # => we must clone the vertex.
                      
                      for clone in vertex.clones:
                        if (clone.maps[0].u == uv[0]) and \
                           (clone.maps[0].v == uv[1]):
                          vertex = clone
                          break
                      else: # Not yet cloned...
                        old_vertex = vertex
                        vertex = Vertex(submesh, vertex.loc, vertex.normal)
                        vertex.cloned_from = old_vertex
                        vertex.influences = old_vertex.influences
                        vertex.maps.append(Map(*uv))
                        old_vertex.clones.append(vertex)
                        
                  face_vertices.append(vertex)
                  
                # Split faces with more than 3 vertices
                for i in range(1, len(face.v) - 1):
                  Face(submesh, face_vertices[0], face_vertices[i],
                       face_vertices[i + 1])
                  
            # Computes LODs info
            if LODS:
              submesh.compute_lods()
            
  # Export animations
              
  if EXPORT_ANIMATION:

      ipoCurveType = ['LocX', 'LocY', 'LocZ', 'QuatX', 'QuatY', 'QuatZ', 'QuatW']
      
      STATUS = "Calculate animations"
      Draw()

      ANIMATIONS = {}
      
      actions = Blender.Armature.NLA.GetActions()

      for a in actions:

        #skip actions beginning with _
        if a[0] == '_' : continue

        #create the animation object
        animation_name = a

        #if the name starts with @ then it is a oneshot action otherwise its a cycle
        if a[0] == '@':
           animation_name = a.split("@")[1]
           aact = 1
        else:
           aact = 0

        print "Animationname: %s" % (animation_name)

        if REMOVE_BAKED:
           tmp = animation_name.split('.BAKED')
           animation_name = "".join(tmp)

        #check for duplicate animation names and work around
        test = animation_name
        suffix = 1
        while ANIMATIONS.get(test):
           print "Warning %s already exists!! renaming" % animation_name
           test = "%s__%i" % (animation_name, suffix)
           suffix += 1
        animation_name = test
           
        animation = ANIMATIONS[animation_name] = Animation(animation_name, aact)

        ipos = actions[a].getAllChannelIpos()
        for bone_name in ipos:
          #skip bones that start with _
          if bone_name[0] == '_' :
             continue

          ipo = ipos[bone_name]
          try: nbez = ipo.getNBezPoints(0)
          except TypeError:
            print "No key frame for action %s, ipo %s, skipping..." % (a, bone_name)
            nbez = 0

          bone = BONES[bone_name]
          track = animation.tracks.get(bone_name)
          if not track:
            track = animation.tracks[bone_name] = Track(animation, bone)
            track.finished = 0
      
          curve = []
          for ctype in ipoCurveType:
            curve.append(ipo.getCurve(ctype))

          for bez in range(nbez):
            time1 = ipo.getCurveBeztriple(0, bez)[3]           
            time = (time1 - 1.0) / FPS
   
            if animation.duration < time:
              animation.duration = time

            loc = bone.loc
            rot = bone.rot
           
            if (curve[0]):
              trans = vector_by_matrix((
                curve[0].evaluate(time1),
                curve[1].evaluate(time1),
                curve[2].evaluate(time1)), bone.matrix)

              loc = [
                bone.loc[0] + trans[0],
                bone.loc[1] + trans[1],
                bone.loc[2] + trans[2]]

            if (curve[3]):
             
              ipo_rot = [
                curve[3].evaluate(time1),
                curve[4].evaluate(time1),
                curve[5].evaluate(time1),
                curve[6].evaluate(time1)]
              
              # We need to blend the rotation from the bone rest state 
              # (=bone.rot) with ipo_rot.
              
              rot = quaternion_multiply(ipo_rot, bone.rot)

            KeyFrame(track, time, loc, rot)
        
          
  # Save all data

  STATUS = "Save files"
  Draw()

  EXPORT_ALL = EXPORT_SKELETON and EXPORT_ANIMATION and \
               EXPORT_MESH and EXPORT_MATERIAL
  cfg_buffer = ""

  if FILE_PREFIX == "":
    std_fname = "cal3d"
  else:
    std_fname = ""
  
  if not os.path.exists(SAVE_TO_DIR):
    os.makedirs(SAVE_TO_DIR)
  else:
    if DELETE_ALL_FILES:
      for file in os.listdir(SAVE_TO_DIR):
        if file.endswith(".cfg") or file.endswith(".caf") or \
           file.endswith(".cmf") or file.endswith(".csf") or \
           file.endswith(".crf") or file.endswith(".xsf") or \
           file.endswith(".xaf") or file.endswith(".xmf") or \
           file.endswith(".xrf"):
           os.unlink(os.path.join(SAVE_TO_DIR, file))
        
  cfg_buffer += "# Cal3D model exported from Blender with blender2cal3d.py\n\n"
  if EXPORT_ALL:
    cfg_buffer += "# --- Scale of model ---\n"
    cfg_buffer += "scale=%f\n\n" % SCALE
  else:
    cfg_buffer += "# Append this file to the model configuration file\n\n"
  
  if EXPORT_SKELETON:
    cfg_buffer += "# --- Skeleton ---\n"
    if EXPORT_TO_XML:  
      open(os.path.join(SAVE_TO_DIR, FILE_PREFIX + std_fname + \
           os.path.basename(SAVE_TO_DIR) +".xsf"),
          "wb").write(skeleton.to_cal3d_xml())
      cfg_buffer += "skeleton=%s.xsf\n" %  (FILE_PREFIX + std_fname +\
               os.path.basename(SAVE_TO_DIR))
    else:
      open(os.path.join(SAVE_TO_DIR,  FILE_PREFIX + std_fname + \
           os.path.basename(SAVE_TO_DIR) + ".csf"),
          "wb").write(skeleton.to_cal3d())
      cfg_buffer += "skeleton=%s.csf\n" %  (FILE_PREFIX + std_fname +\
               os.path.basename(SAVE_TO_DIR))
    cfg_buffer += "\n"
  
  if EXPORT_ANIMATION:
    cfg_buffer += "# --- Animations ---\n"
    for animation in ANIMATIONS.values():
      # Cal3D does not support animation with only one state
      if animation.duration:
        animation.name = RENAME_ANIMATIONS.get(animation.name) or animation.name

        action_suffix=""
        if animation.action:
           action_suffix = "_action"

        if EXPORT_TO_XML:
          open(os.path.join(SAVE_TO_DIR, FILE_PREFIX + \
               animation.name + ".xaf"), "wb").write(animation.to_cal3d_xml())
          cfg_buffer += "animation%s=%s.xaf\n" % (action_suffix, (FILE_PREFIX + animation.name))
        else:
          open(os.path.join(SAVE_TO_DIR, FILE_PREFIX + \
               animation.name + ".caf"), "wb").write(animation.to_cal3d())
          cfg_buffer += "animation%s=%s.caf\n" % (action_suffix, (FILE_PREFIX + animation.name))

        # Prints animation names and durations
        print animation.name, "duration", animation.duration * FPS + 1.0
    cfg_buffer += "\n"

  if EXPORT_MESH:
    cfg_buffer += "# --- Meshes ---\n"
    for mesh in meshes:
      if not mesh.name.startswith("_"):
        if EXPORT_TO_XML:
          open(os.path.join(SAVE_TO_DIR, FILE_PREFIX + mesh.name + ".xmf"),
              "wb").write(mesh.to_cal3d_xml())
          cfg_buffer += "mesh=%s.xmf\n" % (FILE_PREFIX + mesh.name)
        else:
          open(os.path.join(SAVE_TO_DIR, FILE_PREFIX + mesh.name + ".cmf"),
              "wb").write(mesh.to_cal3d())
          cfg_buffer += "mesh=%s.cmf\n" % (FILE_PREFIX + mesh.name)
    cfg_buffer += "\n"
  
  if EXPORT_MATERIAL:
    cfg_buffer += "# --- Materials ---\n"
    materials = MATERIALS.values()
    materials.sort(lambda a, b: cmp(a.id, b.id))
    for material in materials:
      if material.maps_filenames:
        fname = os.path.splitext(os.path.basename(material.maps_filenames[0]))[0]
      else:
        fname = "plain"
      if EXPORT_TO_XML:
        open(os.path.join(SAVE_TO_DIR, FILE_PREFIX + fname + ".xrf"),
            "wb").write(material.to_cal3d_xml())
        cfg_buffer += "material=%s.xrf\n" % (FILE_PREFIX + fname)
      else:
        open(os.path.join(SAVE_TO_DIR, FILE_PREFIX + fname + ".crf"),
            "wb").write(material.to_cal3d())
        cfg_buffer += "material=%s.crf\n" % (FILE_PREFIX + fname)
    cfg_buffer += "\n"

  if EXPORT_ALL:
    cfg_prefix = ""
  else:
    cfg_prefix = "append_to_"

  cfg = open(os.path.join(SAVE_TO_DIR, cfg_prefix + FILE_PREFIX + std_fname +\
             os.path.basename(SAVE_TO_DIR) + ".cfg"), "wb")
  print >> cfg, cfg_buffer
  cfg.close()

  print "Saved to", SAVE_TO_DIR
  print "Done."

  STATUS = "Export finished."
  Draw()


# ::: GUI around the whole thing, not very clean, but it works for me...

_save_dir = Create(SAVE_TO_DIR)
_file_prefix = Create(FILE_PREFIX)
_image_prefix = Create(IMAGE_PREFIX)
_scale = Create(SCALE)
_framepsec = Create(FPS)
STATUS = "Done nothing yet"

def gui():
  global EXPORT_TO_XML, EXPORT_SKELETON, EXPORT_ANIMATION, EXPORT_MESH, \
         EXPORT_MATERIAL, SAVE_TO_DIR, _save_dir, _scale, SCALE, \
         EXPORT_FOR_SOYA, REMOVE_PATH_FROM_IMAGE, LODS, _file_prefix, \
         FILE_PREFIX, _image_prefix, IMAGE_PREFIX, DELETE_ALL_FILES, STATUS, \
         _framepsec, FPS

  glRasterPos2i(8, 14)
  Text("Status: %s" % STATUS)

  _export_button = Button("Export (E)", 1, 8, 36, 100, 20, 
                          "Start export to Cal3D format")
  _quit_button = Button("Quit (Q)", 5, 108, 36, 100, 20, "Exit from script")

  _delete_toggle = Toggle("X", 15, 8, 64, 20, 20, DELETE_ALL_FILES, 
         "Delete all existing Cal3D files in export directory")
  _SF_toggle = Toggle("_SF", 6, 28, 64, 45, 20, EXPORT_SKELETON, 
         "Export skeleton (CSF/XSF)")
  _AF_toggle = Toggle("_AF", 7, 73, 64, 45, 20, EXPORT_ANIMATION, 
         "Export animations (CAF/XAF)")
  _MF_toggle = Toggle("_MF", 8, 118, 64, 45, 20, EXPORT_MESH, 
         "Export mesh (CMF/XMF)")
  _RF_toggle = Toggle("_RF", 9, 163, 64, 45, 20, EXPORT_MATERIAL, 
         "Export materials (CRF/XRF)")

  _XML_toggle = Toggle("Export to XML", 2, 8, 84, 100, 20, EXPORT_TO_XML, 
         "Export to Cal3D XML or binary fileformat")
  _soya_toggle = Toggle("Export for Soya", 10, 108, 84, 100, 20, 
                        EXPORT_FOR_SOYA, "Export for Soya 3D Engine")

  _imagepath_toggle = Toggle("X imagepath", 11, 8, 104, 100, 20, 
                        REMOVE_PATH_FROM_IMAGE, "Remove path from imagename")
  _lods_toggle = Toggle("Calculate LODS", 12, 108, 104, 100, 20, 
                        LODS, "Calculate LODS, quit slow and not optimal")

  _scale = Slider("S:", 4, 8, 132, 100, 20, SCALE, 0.00, 10.00, 0, \
                  "Sets the scale of the model (small number will scale up)")

  _framepsec = Slider("F:", 16, 108, 132, 100, 20, FPS, 0.00, 100.0, 0, \
                  "Sets the export framerate (FPS)")

  _image_prefix = String("Image prefix: ", 13, 8, 160, 200, 20, IMAGE_PREFIX, \
                         256, "Prefix used for imagename (if you have the " + \
                         "textures in a subdirectory called textures, " + \
                         "the prefix would be \"textures\\\\\")")

  _file_prefix = String("File prefix: ", 14, 8, 180, 200, 20, FILE_PREFIX, \
                        256, "Prefix to all exported Cal3D files "+ \
                        "(f.e. \"model_\")")

  _save_dir = String("Export to: ", 3, 8, 200, 200, 20, _save_dir.val, 256, \
                     "Directory to save files to")



def event(evt, val):
  global STATUS

  if (evt == QKEY or evt == ESCKEY):
    Exit()
    return
  if evt == EKEY:
    update_reg()
    export()

def bevent(evt):
  global EXPORT_TO_XML, EXPORT_SKELETON, EXPORT_ANIMATION, EXPORT_MESH, \
         EXPORT_MATERIAL, _save_dir, SAVE_TO_DIR, _scale, SCALE, \
         EXPORT_FOR_SOYA, REMOVE_PATH_FROM_IMAGE, LODS, _file_prefix, \
         FILE_PREFIX, _image_prefix, IMAGE_PREFIX, DELETE_ALL_FILES, STATUS, \
         _framepsec, FPS

  if evt == 1:
    update_reg()
    export()
  if evt == 2:
    EXPORT_TO_XML = 1 - EXPORT_TO_XML
  if evt == 3:
    SAVE_TO_DIR = _save_dir.val
  if evt == 4:
    SCALE = _scale.val
  if evt == 5:
    Exit()
    return
  if evt == 6:
    EXPORT_SKELETON = 1 - EXPORT_SKELETON
  if evt == 7:
    EXPORT_ANIMATION = 1 - EXPORT_ANIMATION
  if evt == 8:
    EXPORT_MESH = 1 - EXPORT_MESH
  if evt == 9:
    EXPORT_MATERIAL = 1 - EXPORT_MATERIAL
  if evt == 10:
    EXPORT_FOR_SOYA = 1 - EXPORT_FOR_SOYA
  if evt == 11:
    REMOVE_PATH_FROM_IMAGE = 1 - REMOVE_PATH_FROM_IMAGE
  if evt == 12:
    LODS = 1 - LODS
  if evt == 13:
    IMAGE_PREFIX = _image_prefix.val
  if evt == 14:
    FILE_PREFIX = _file_prefix.val
  if evt == 15:
    DELETE_ALL_FILES = 1 - DELETE_ALL_FILES
  if evt == 16:
     FPS = _framepsec.val
  Draw()

def update_reg():
   x = {}
   x['sd'] = SAVE_TO_DIR
   x['da'] = DELETE_ALL_FILES
   x['es'] = EXPORT_SKELETON
   x['ea'] = EXPORT_ANIMATION
   x['em'] = EXPORT_MESH
   x['emat'] = EXPORT_MATERIAL
   x['fp'] = FILE_PREFIX
   x['rp'] = REMOVE_PATH_FROM_IMAGE
   x['ip'] = IMAGE_PREFIX
   x['ex'] = EXPORT_TO_XML
   x['sc'] = SCALE
   x['fps'] = FPS
   x['soya'] = EXPORT_FOR_SOYA
   x['lod'] = LODS
   Blender.Registry.SetKey('Cal3dExporter', x)

def get_from_reg():
   global SAVE_TO_DIR, DELETE_ALL_FILES, EXPORT_SKELETON, \
     EXPORT_ANIMATION, EXPORT_MESH, EXPORT_MATERIAL, FILE_PREFIX,  \
     REMOVE_PATH_FROM_IMAGE, IMAGE_PREFIX, EXPORT_TO_XML, SCALE, \
     FPS, EXPORT_FOR_SOYA, LODS

   tmp = Blender.Registry.GetKey("Cal3dExporter")
   if tmp: 
     SAVE_TO_DIR = tmp['sd']
     #DELETE_ALL_FILES = tmp['da']
     EXPORT_SKELETON = tmp['es']
     EXPORT_ANIMATION = tmp['ea']
     EXPORT_MESH = tmp['em']
     EXPORT_MATERIAL = tmp['emat']
     FILE_PREFIX = tmp['fp']
     REMOVE_PATH_FROM_IMAGE = tmp['rp']
     IMAGE_PREFIX = tmp['ip']
     EXPORT_TO_XML = tmp['ex']
     SCALE = tmp['sc']
     FPS = tmp['fps']
     EXPORT_FOR_SOYA = tmp['soya']
     LODS = tmp['lod']

get_from_reg()
Register(gui, event, bevent)