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truespace_import.py

#!BPY

"""
Name: 'TrueSpace (.cob)...'
Blender: 232
Group: 'Import'
Tooltip: 'Import TrueSpace Object File Format (.cob)'
"""

__author__ = "Anthony D'Agostino (Scorpius)"
__url__ = ("blender", "elysiun",
"Author's homepage, http://www.redrival.com/scorpius")
__version__ = "Part of IOSuite 0.5"

__bpydoc__ = """\
This script imports TrueSpace files to Blender

TrueSpace is a commercial modeling and rendering application. The .cob
file format is composed of 'chunks,' is well defined, and easy to read and
write. It's very similar to LightWave's lwo format.

Usage:<br>
      Execute this script from the "File->Import" menu and choose a TrueSpace
file to open.

Supported:<br>
      Meshes only. Supports UV Coordinates. COB files in ascii format can't be
read.

Missing:<br>
      Materials, and Vertex Color info will be ignored.

Known issues:<br>
      Triangulation of convex polygons works fine, and uses a very simple
fanning algorithm. Convex polygons (i.e., shaped like the letter "U")
require a different algorithm, and will be triagulated incorrectly.

Notes:<br>
      There are a few differences between how Blender & TrueSpace represent
their objects' transformation matrices. Blender simply uses a 4x4 matrix,
and trueSpace splits it into the following two fields.

      For the 'Local Axes' values: The x, y, and z-axis represent a simple
rotation matrix.  This is equivalent to Blender's object matrix before
it was combined with the object's scaling matrix. Dividing each value by
the appropriate scaling factor (and transposing at the same time)
produces the original rotation matrix.

      For the 'Current Position' values:  This is equivalent to Blender's
object matrix except that the last row is omitted and the xyz location
is used in the last column. Binary format uses a 4x3 matrix, ascii
format uses a 4x4 matrix.

For Cameras: The matrix here gets a little confusing, and I'm not sure of
how to handle it.
"""

# $Id: truespace_import.py,v 1.5 2004/11/30 02:27:46 ianwill Exp $
#
# +---------------------------------------------------------+
# | Copyright (c) 2001 Anthony D'Agostino                   |
# | http://www.redrival.com/scorpius                        |
# | scorpius@netzero.com                                    |
# | June 12, 2001                                           |
# | Released under the Blender Artistic Licence (BAL)       |
# | Import Export Suite v0.5                                |
# +---------------------------------------------------------+
# | Read and write Caligari trueSpace File Format (*.cob)   |
# +---------------------------------------------------------+

import Blender, mod_meshtools
import struct, chunk, os, cStringIO, time

# =======================
# === COB Chunk Class ===
# =======================
class CobChunk(chunk.Chunk):
      def __init__(self, file, align = 0, bigendian = 0, inclheader = 0): #$ COB
            self.closed = 0
            self.align = align      # whether to align to word (2-byte) boundaries
            if bigendian:
                  strflag = '>'
            else:
                  strflag = '<'
            self.file = file
            self.chunkname = file.read(4)
            if len(self.chunkname) < 4:
                  raise EOFError
            self.major_ver, = struct.unpack(strflag+'h', file.read(2))      #$ COB
            self.minor_ver, = struct.unpack(strflag+'h', file.read(2))      #$ COB
            self.chunk_id,    = struct.unpack(strflag+'l', file.read(4))      #$ COB
            self.parent_id, = struct.unpack(strflag+'l', file.read(4))      #$ COB
            try:
                  self.chunksize = struct.unpack(strflag+'l', file.read(4))[0]
            except struct.error:
                  raise EOFError
            if inclheader:
                  self.chunksize = self.chunksize - 20                                    #$ COB
            self.size_read = 0
            try:
                  self.offset = self.file.tell()
            except:
                  self.seekable = 0
            else:
                  self.seekable = 1

# ============================
# === Read COB File Header ===
# ============================
def read_header(file):
      magic,       = struct.unpack("<9s", file.read(9))
      version, = struct.unpack("<6s", file.read(6))
      format,  = struct.unpack("<1c", file.read(1))
      endian,  = struct.unpack("<2s", file.read(2))
      misc,  = struct.unpack("13s", file.read(13))
      newline, = struct.unpack("<1B", file.read(1))
      return format

# ========================================
# === Read PolH (Polygonal Data) Chunk ===
# ========================================
def read_polh(chunk):
      data = cStringIO.StringIO(chunk.read())
      oname = read_ObjectName(data)
      local = read_LocalAxes(data)
      crpos = read_CurrentPosition(data)
      verts = read_VertexList(data)
      uvcoords = read_UVCoords(data)
      faces, facesuv = read_FaceList(data, chunk)
      return verts, faces, oname, facesuv, uvcoords

# === Read Object Name ===
def read_ObjectName(data):
      dupecount, namelen = struct.unpack("<hh", data.read(4))
      objname = data.read(namelen)
      if objname == '': objname = 'NoName'
      if dupecount > 0: objname = objname + ', ' + `dupecount`
      return objname

# === Read Local Axes ===
def read_LocalAxes(data):
      location = struct.unpack("<fff", data.read(12))
      rotation_matrix=[]
      for i in range(3):
            row = struct.unpack("<fff", data.read(12))
            #print "% f % f % f" % row
            rotation_matrix.append(list(row))
      #print
      rotation_matrix = mod_meshtools.transpose(rotation_matrix)

# === Read Current Position ===
def read_CurrentPosition(data):
      transformation_matrix=[]
      for i in range(3):
            row = struct.unpack("<ffff", data.read(16))
            #print "% f % f % f % f" % row
            transformation_matrix.append(list(row))
      #print

# === Read Vertex List ===
def read_VertexList(data):
      verts = []
      numverts, = struct.unpack("<l", data.read(4))
      for i in range(numverts):
            if not i%100 and mod_meshtools.show_progress:
                  Blender.Window.DrawProgressBar(float(i)/numverts, "Reading Verts")
            x, y, z = struct.unpack("<fff", data.read(12))
            verts.append((y, -x, z))
      return verts

# === Read UV Vertex List ===
def read_UVCoords(data):
      uvcoords = []
      numuvcoords, = struct.unpack("<l", data.read(4))
      for i in range(numuvcoords):
            if not i%100 and mod_meshtools.show_progress:
                  Blender.Window.DrawProgressBar(float(i)/numuvcoords, "Reading UV Coords")
            uv = struct.unpack("<ff", data.read(8))
            uvcoords.append(uv)

      #print "num uvcoords:", len(uvcoords)
      #for i in range(len(uvcoords)): print "%.4f, %.4f" % uvcoords[i]
      return uvcoords

# === Read Face List ===
def read_FaceList(data, chunk):
      faces = []                       ; facesuv = []
      numfaces, = struct.unpack("<l", data.read(4))
      for i in range(numfaces):
            if not i%100 and mod_meshtools.show_progress:
                  Blender.Window.DrawProgressBar(float(i)/numfaces, "Reading Faces")

            face_flags, numfaceverts = struct.unpack("<Bh", data.read(3))

            if (face_flags & 0x08) == 0x08:
                  print "face #" + `i-1` + " contains a hole."
                  pass
            else:
                  data.read(2)  # Material Index

            facev = []                 ; faceuv = []
            for j in range(numfaceverts):
                  index, uvidx = struct.unpack("<ll", data.read(8))
                  facev.append(index); faceuv.append(uvidx)
            facev.reverse()      ; faceuv.reverse()
            faces.append(facev)    ; facesuv.append(faceuv)

      if chunk.minor_ver == 6:
            DrawFlags, RadiosityQuality = struct.unpack("<lh", data.read(6))
      if chunk.minor_ver == 8:
            DrawFlags, = struct.unpack("<l", data.read(4))

      return faces                     , facesuv

# =============================
# === Read trueSpace Format ===
# =============================
def read(filename):
      start = time.clock()
      file = open(filename, "rb")

      # === COB header ===
      if read_header(file) == 'A':
            print "Can't read ASCII format"
            return

      while 1:
            try:
                  cobchunk = CobChunk(file)
            except EOFError:
                  break
            if cobchunk.chunkname == "PolH":
                  verts, faces, objname, facesuv, uvcoords = read_polh(cobchunk)
                  mod_meshtools.create_mesh(verts, faces, objname, facesuv, uvcoords)

                  '''
                  object = Blender.Object.GetSelected()
                  obj = Blender.Object.Get(objname)
                  obj.loc = location
                  obj.rot = mod_meshtools.mat2euler(rotation_matrix)
                  obj.size = (transformation_matrix[0][0]/rotation_matrix[0][0],
                                    transformation_matrix[1][1]/rotation_matrix[1][1],
                                    transformation_matrix[2][2]/rotation_matrix[2][2])

                  '''
            else:
                  cobchunk.skip()

      Blender.Window.DrawProgressBar(1.0, '')  # clear progressbar
      file.close()
      end = time.clock()
      seconds = " in %.2f %s" % (end-start, "seconds")
      message = "Successfully imported " + os.path.basename(filename) + seconds
      mod_meshtools.print_boxed(message)
      #print "objname :", objname
      #print "numverts:", len(verts)
      #print "numfaces:", len(faces)

def fs_callback(filename):
      read(filename)

Blender.Window.FileSelector(fs_callback, "Import COB")


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