io_export_md3.py

# ##### BEGIN GPL LICENSE BLOCK #####
#
#  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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ##### END GPL LICENSE BLOCK #####

__author__ = ["Xembie"]
__version__ = '0.7'
__url__ = ["www.blender.org"]

"""
Name: 'Quake Model 3 (.md3)...'
Blender: 253
Group: 'Export'
Tooltip: 'Save a Quake Model 3 File'
"""

bl_addon_info = {
    'name': 'Quake Model 3 (.md3',
    'author': 'Xembie',
    'version': (0,7),
    'blender': (2, 5, 3),
    'api': 31667,
    'location': 'File > Import',
    'description': 'Import files in the Autocad DXF format (.dxf)',
    'warning': '', # used for warning icon and text in addons panel
    'wiki_url': 'http://wiki.blender.org/index.php/Extensions:2.5/Py/'\
        'Scripts/',
    'tracker_url': 'http://projects.blender.org/tracker/index.php?'\
	    'func=detail&aid=23160&group_id=153&atid=468',
    'category': 'Import/Export'}
import bpy,struct,math,os

MAX_QPATH = 64

MD3_IDENT = "IDP3"
MD3_VERSION = 15
MD3_MAX_TAGS = 16
MD3_MAX_SURFACES = 32
MD3_MAX_FRAMES = 1024
MD3_MAX_SHADERS = 256
MD3_MAX_VERTICES = 4096
MD3_MAX_TRIANGLES = 8192
MD3_XYZ_SCALE = 64.0

class md3Vert:
	xyz = []
	normal = 0
	binaryFormat = "<3hH"
	
	def __init__(self):
		self.xyz = [0.0, 0.0, 0.0]
		self.normal = 0
		
	def GetSize(self):
		return struct.calcsize(self.binaryFormat)
	
	# copied from PhaethonH <phaethon@linux.ucla.edu> md3.py
	def Decode(self, latlng):
		lat = (latlng >> 8) & 0xFF;
		lng = (latlng) & 0xFF;
		lat *= math.pi / 128;
		lng *= math.pi / 128;
		x = math.cos(lat) * math.sin(lng)
		y = math.sin(lat) * math.sin(lng)
		z =                 math.cos(lng)
		retval = [ x, y, z ]
		return retval
	
	# copied from PhaethonH <phaethon@linux.ucla.edu> md3.py
	def Encode(self, normal):
		x = normal[0]
		y = normal[1]
		z = normal[2]
		# normalize
		l = math.sqrt((x*x) + (y*y) + (z*z))
		if l == 0:
			return 0
		x = x/l
		y = y/l
		z = z/l
		
		if (x == 0.0) & (y == 0.0) :
			if z > 0.0:
				return 0
			else:
				return (128 << 8)
		
		lng = math.acos(z) * 255 / (2 * math.pi)
		lat = math.atan2(y, x) * 255 / (2 * math.pi)
		retval = ((int(lat) & 0xFF) << 8) | (int(lng) & 0xFF)
		return retval
		
	def Save(self, file):
		tmpData = [0] * 4
		tmpData[0] = int(self.xyz[0] * MD3_XYZ_SCALE)
		tmpData[1] = int(self.xyz[1] * MD3_XYZ_SCALE)
		tmpData[2] = int(self.xyz[2] * MD3_XYZ_SCALE)
		tmpData[3] = self.normal
		data = struct.pack(self.binaryFormat, tmpData[0], tmpData[1], tmpData[2], tmpData[3])
		file.write(data)
		
class md3TexCoord:
	u = 0.0
	v = 0.0

	binaryFormat = "<2f"

	def __init__(self):
		self.u = 0.0
		self.v = 0.0
		
	def GetSize(self):
		return struct.calcsize(self.binaryFormat)

	def Save(self, file):
		tmpData = [0] * 2
		tmpData[0] = self.u
		tmpData[1] = 1.0 - self.v
		data = struct.pack(self.binaryFormat, tmpData[0], tmpData[1])
		file.write(data)

class md3Triangle:
	indexes = []

	binaryFormat = "<3i"

	def __init__(self):
		self.indexes = [ 0, 0, 0 ]
		
	def GetSize(self):
		return struct.calcsize(self.binaryFormat)

	def Save(self, file):
		tmpData = [0] * 3
		tmpData[0] = self.indexes[0]
		tmpData[1] = self.indexes[2] # reverse
		tmpData[2] = self.indexes[1] # reverse
		data = struct.pack(self.binaryFormat,tmpData[0], tmpData[1], tmpData[2])
		file.write(data)

class md3Shader:
	name = ""
	index = 0
	
	binaryFormat = "<%dsi" % MAX_QPATH

	def __init__(self):
		self.name = ""
		self.index = 0
		
	def GetSize(self):
		return struct.calcsize(self.binaryFormat)

	def Save(self, file):
		tmpData = [0] * 2
		tmpData[0] = self.name
		tmpData[1] = self.index
		data = struct.pack(self.binaryFormat, tmpData[0], tmpData[1])
		file.write(data)

class md3Surface:
	ident = ""
	name = ""
	flags = 0
	numFrames = 0
	numShaders = 0
	numVerts = 0
	numTriangles = 0
	ofsTriangles = 0
	ofsShaders = 0
	ofsUV = 0
	ofsVerts = 0
	ofsEnd = 0
	shaders = []
	triangles = []
	uv = []
	verts = []
	
	binaryFormat = "<4s%ds10i" % MAX_QPATH  # 1 int, name, then 10 ints
	
	def __init__(self):
		self.ident = ""
		self.name = ""
		self.flags = 0
		self.numFrames = 0
		self.numShaders = 0
		self.numVerts = 0
		self.numTriangles = 0
		self.ofsTriangles = 0
		self.ofsShaders = 0
		self.ofsUV = 0
		self.ofsVerts = 0
		self.ofsEnd
		self.shaders = []
		self.triangles = []
		self.uv = []
		self.verts = []
		
	def GetSize(self):
		sz = struct.calcsize(self.binaryFormat)
		self.ofsTriangles = sz
		for t in self.triangles:
			sz += t.GetSize()
		self.ofsShaders = sz
		for s in self.shaders:
			sz += s.GetSize()
		self.ofsUV = sz
		for u in self.uv:
			sz += u.GetSize()
		self.ofsVerts = sz
		for v in self.verts:
			sz += v.GetSize()
		self.ofsEnd = sz
		return self.ofsEnd
	
	def Save(self, file):
		self.GetSize()
		tmpData = [0] * 12
		tmpData[0] = self.ident
		tmpData[1] = self.name
		tmpData[2] = self.flags
		tmpData[3] = self.numFrames
		tmpData[4] = self.numShaders
		tmpData[5] = self.numVerts
		tmpData[6] = self.numTriangles
		tmpData[7] = self.ofsTriangles
		tmpData[8] = self.ofsShaders
		tmpData[9] = self.ofsUV
		tmpData[10] = self.ofsVerts
		tmpData[11] = self.ofsEnd
		data = struct.pack(self.binaryFormat, tmpData[0],tmpData[1],tmpData[2],tmpData[3],tmpData[4],tmpData[5],tmpData[6],tmpData[7],tmpData[8],tmpData[9],tmpData[10],tmpData[11])
		file.write(data)

		# write the tri data
		for t in self.triangles:
			t.Save(file)

		# save the shader coordinates
		for s in self.shaders:
			s.Save(file)

		# save the uv info
		for u in self.uv:
			u.Save(file)

		# save the verts
		for v in self.verts:
			v.Save(file)

class md3Tag:
	name = ""
	origin = []
	axis = []
	
	binaryFormat="<%ds3f9f" % MAX_QPATH
	
	def __init__(self):
		self.name = ""
		self.origin = [0, 0, 0]
		self.axis = [0, 0, 0, 0, 0, 0, 0, 0, 0]
		
	def GetSize(self):
		return struct.calcsize(self.binaryFormat)
		
	def Save(self, file):
		tmpData = [0] * 13
		tmpData[0] = self.name
		tmpData[1] = float(self.origin[0])
		tmpData[2] = float(self.origin[1])
		tmpData[3] = float(self.origin[2])
		tmpData[4] = float(self.axis[0])
		tmpData[5] = float(self.axis[1])
		tmpData[6] = float(self.axis[2])
		tmpData[7] = float(self.axis[3])
		tmpData[8] = float(self.axis[4])
		tmpData[9] = float(self.axis[5])
		tmpData[10] = float(self.axis[6])
		tmpData[11] = float(self.axis[7])
		tmpData[12] = float(self.axis[8])
		data = struct.pack(self.binaryFormat, tmpData[0],tmpData[1],tmpData[2],tmpData[3],tmpData[4],tmpData[5],tmpData[6], tmpData[7], tmpData[8], tmpData[9], tmpData[10], tmpData[11], tmpData[12])
		file.write(data)
	
class md3Frame:
	mins = 0
	maxs = 0
	localOrigin = 0
	radius = 0.0
	name = ""
	
	binaryFormat="<3f3f3ff16s"
	
	def __init__(self):
		self.mins = [0, 0, 0]
		self.maxs = [0, 0, 0]
		self.localOrigin = [0, 0, 0]
		self.radius = 0.0
		self.name = ""
		
	def GetSize(self):
		return struct.calcsize(self.binaryFormat)

	def Save(self, file):
		tmpData = [0] * 11
		tmpData[0] = self.mins[0]
		tmpData[1] = self.mins[1]
		tmpData[2] = self.mins[2]
		tmpData[3] = self.maxs[0]
		tmpData[4] = self.maxs[1]
		tmpData[5] = self.maxs[2]
		tmpData[6] = self.localOrigin[0]
		tmpData[7] = self.localOrigin[1]
		tmpData[8] = self.localOrigin[2]
		tmpData[9] = self.radius
		tmpData[10] = self.name
		data = struct.pack(self.binaryFormat, tmpData[0],tmpData[1],tmpData[2],tmpData[3],tmpData[4],tmpData[5],tmpData[6],tmpData[7], tmpData[8], tmpData[9], tmpData[10])
		file.write(data)

class md3Object:
	# header structure
	ident = ""			# this is used to identify the file (must be IDP3)
	version = 0			# the version number of the file (Must be 15)
	name = ""
	flags = 0
	numFrames = 0
	numTags = 0
	numSurfaces = 0
	numSkins = 0
	ofsFrames = 0
	ofsTags = 0
	ofsSurfaces = 0
	ofsEnd = 0
	frames = []
	tags = []
	surfaces = []

	binaryFormat="<4si%ds9i" % MAX_QPATH  # little-endian (<), 17 integers (17i)

	def __init__(self):
		self.ident = 0
		self.version = 0
		self.name = ""
		self.flags = 0
		self.numFrames = 0
		self.numTags = 0
		self.numSurfaces = 0
		self.numSkins = 0
		self.ofsFrames = 0
		self.ofsTags = 0
		self.ofsSurfaces = 0
		self.ofsEnd = 0
		self.frames = []
		self.tags = []
		self.surfaces = []

	def GetSize(self):
		self.ofsFrames = struct.calcsize(self.binaryFormat)
		self.ofsTags = self.ofsFrames
		for f in self.frames:
			self.ofsTags += f.GetSize()
		self.ofsSurfaces += self.ofsTags
		for t in self.tags:
			self.ofsSurfaces += t.GetSize()
		self.ofsEnd = self.ofsSurfaces
		for s in self.surfaces:
			self.ofsEnd += s.GetSize()
		return self.ofsEnd
		
	def Save(self, file):
		self.GetSize()
		tmpData = [0] * 12
		tmpData[0] = self.ident
		tmpData[1] = self.version
		tmpData[2] = self.name
		tmpData[3] = self.flags
		tmpData[4] = self.numFrames
		tmpData[5] = self.numTags
		tmpData[6] = self.numSurfaces
		tmpData[7] = self.numSkins
		tmpData[8] = self.ofsFrames
		tmpData[9] = self.ofsTags
		tmpData[10] = self.ofsSurfaces
		tmpData[11] = self.ofsEnd

		data = struct.pack(self.binaryFormat, tmpData[0],tmpData[1],tmpData[2],tmpData[3],tmpData[4],tmpData[5],tmpData[6],tmpData[7], tmpData[8], tmpData[9], tmpData[10], tmpData[11])
		file.write(data)

		for f in self.frames:
			f.Save(file)
			
		for t in self.tags:
			t.Save(file)
			
		for s in self.surfaces:
			s.Save(file)


def message(log,msg):
  if log:
    log.write(msg + "\n")
  else:
    print(msg)

class md3Settings:
  def __init__(self,
               savepath,
               name,
               logpath,
               overwrite=True,
               dumpall=False,
               ignoreuvs=False,
               scale=1.0,
               offsetx=0.0,
               offsety=0.0,
               offsetz=0.0):
    self.savepath = savepath
    self.name = name
    self.logpath = logpath
    self.overwrite = overwrite
    self.dumpall = dumpall
    self.ignoreuvs = ignoreuvs
    self.scale = scale
    self.offsetx = offsetx
    self.offsety = offsety
    self.offsetz = offsetz

def print_md3(log,md3,dumpall):
  message(log,"Header Information")
  message(log,"Ident: " + str(md3.ident))
  message(log,"Version: " + str(md3.version))
  message(log,"Name: " + md3.name)
  message(log,"Flags: " + str(md3.flags))
  message(log,"Number of Frames: " + str(md3.numFrames))
  message(log,"Number of Tags: " + str(md3.numTags))
  message(log,"Number of Surfaces: " + str(md3.numSurfaces))
  message(log,"Number of Skins: " + str(md3.numSkins))
  message(log,"Offset Frames: " + str(md3.ofsFrames))
  message(log,"Offset Tags: " + str(md3.ofsTags))
  message(log,"Offset Surfaces: " + str(md3.ofsSurfaces))
  message(log,"Offset end: " + str(md3.ofsEnd))
  if dumpall:
    message(log,"Frames:")
    for f in md3.frames:
      message(log," Mins: " + str(f.mins[0]) + " " + str(f.mins[1]) + " " + str(f.mins[2]))
      message(log," Maxs: " + str(f.maxs[0]) + " " + str(f.maxs[1]) + " " + str(f.maxs[2]))
      message(log," Origin(local): " + str(f.localOrigin[0]) + " " + str(f.localOrigin[1]) + " " + str(f.localOrigin[2]))
      message(log," Radius: " + str(f.radius))
      message(log," Name: " + f.name)

    message(log,"Tags:")
    for t in md3.tags:
      message(log," Name: " + t.name)
      message(log," Origin: " + str(t.origin[0]) + " " + str(t.origin[1]) + " " + str(t.origin[2]))
      message(log," Axis[0]: " + str(t.axis[0]) + " " + str(t.axis[1]) + " " + str(t.axis[2]))
      message(log," Axis[1]: " + str(t.axis[3]) + " " + str(t.axis[4]) + " " + str(t.axis[5]))
      message(log," Axis[2]: " + str(t.axis[6]) + " " + str(t.axis[7]) + " " + str(t.axis[8]))

    message(log,"Surfaces:")
    for s in md3.surfaces:
      message(log," Ident: " + s.ident)
      message(log," Name: " + s.name)
      message(log," Flags: " + str(s.flags))
      message(log," # of Frames: " + str(s.numFrames))
      message(log," # of Shaders: " + str(s.numShaders))
      message(log," # of Verts: " + str(s.numVerts))
      message(log," # of Triangles: " + str(s.numTriangles))
      message(log," Offset Triangles: " + str(s.ofsTriangles))
      message(log," Offset UVs: " + str(s.ofsUV))
      message(log," Offset Verts: " + str(s.ofsVerts))
      message(log," Offset End: " + str(s.ofsEnd))
      message(log," Shaders:")
      for shader in s.shaders:
        message(log,"  Name: " + shader.name)
        message(log,"  Index: " + str(shader.index))
      message(log," Triangles:")
      for tri in s.triangles:
        message(log,"  Indexes: " + str(tri.indexes[0]) + " " + str(tri.indexes[1]) + " " + str(tri.indexes[2]))
      message(log," UVs:")
      for uv in s.uv:
        message(log,"  U: " + str(uv.u))
        message(log,"  V: " + str(uv.v)) 
      message(log," Verts:")
      for vert in s.verts:
        message(log,"  XYZ: " + str(vert.xyz[0]) + " " + str(vert.xyz[1]) + " " + str(vert.xyz[2]))
        message(log,"  Normal: " + str(vert.normal))

  shader_count = 0
  vert_count = 0
  tri_count = 0
  for surface in md3.surfaces:
    shader_count += surface.numShaders
    tri_count += surface.numTriangles
    vert_count += surface.numVerts

  if md3.numTags >= MD3_MAX_TAGS:
    message(log,"!Warning: Tag limit reached! " + str(md3.numTags))
  if md3.numSurfaces >= MD3_MAX_SURFACES:
    message(log,"!Warning: Surface limit reached! " + str(md3.numSurfaces))
  if md3.numFrames >= MD3_MAX_FRAMES:
    message(log,"!Warning: Frame limit reached! " + str(md3.numFrames))
  if shader_count >= MD3_MAX_SHADERS:
    message(log,"!Warning: Shader limit reached! " + str(shader_count))
  if vert_count >= MD3_MAX_VERTICES:
    message(log,"!Warning: Vertex limit reached! " + str(vert_count))
  if tri_count >= MD3_MAX_TRIANGLES:
    message(log,"!Warning: Triangle limit reached! " + str(tri_count))

def save_md3(settings):
  if settings.logpath:
    if settings.overwrite:
      log = open(settings.logpath,"w")
    else:
      log = open(settings.logpath,"a")
  else:
    log = 0
  message(log,"##########Exporting MD3##########")
  bpy.ops.object.mode_set(mode='OBJECT')
  md3 = md3Object()
  md3.ident = MD3_IDENT
  md3.version = MD3_VERSION
  md3.name = settings.name
  md3.numFrames = (bpy.context.scene.frame_end + 1) - bpy.context.scene.frame_start

  for obj in bpy.context.selected_objects:
    if obj.type == 'MESH':
      nsurface = md3Surface()
      nsurface.name = obj.name
      nsurface.ident = MD3_IDENT
 
      vertlist = []

      for f,face in enumerate(obj.data.faces):
        ntri = md3Triangle()
        if len(face.verts) != 3:
          message(log,"Found a nontriangle face in object " + obj.name)
          continue

        for v,vert_index in enumerate(face.verts):
          uv_u = round(obj.data.active_uv_texture.data[f].uv[v][0],5)
          uv_v = round(obj.data.active_uv_texture.data[f].uv[v][1],5)

          match = 0
          match_index = 0
          for i,vi in enumerate(vertlist):
            if vi == vert_index:
              if settings.ignoreuvs:
                match = 1#there is a uv match for all
                match_index = i
              else:
                if nsurface.uv[i].u == uv_u and nsurface.uv[i].v == uv_v:
                  match = 1
                  match_index = i

          if match == 0:
            vertlist.append(vert_index)
            ntri.indexes[v] = nsurface.numVerts
            ntex = md3TexCoord()
            ntex.u = uv_u
            ntex.v = uv_v
            nsurface.uv.append(ntex)
            nsurface.numVerts += 1
          else:
            ntri.indexes[v] = match_index
        nsurface.triangles.append(ntri)
        nsurface.numTriangles += 1

      if obj.data.active_uv_texture:
        nshader = md3Shader()
        nshader.name = obj.data.active_uv_texture.name
        nshader.index = nsurface.numShaders
        nsurface.shaders.append(nshader)
        nsurface.numShaders += 1
      if nsurface.numShaders < 1: #we should add a blank as a placeholder
        nshader = md3Shader()
        nshader.name = "NULL"
        nsurface.shaders.append(nshader)
        nsurface.numShaders += 1

      for frame in range(bpy.context.scene.frame_start,bpy.context.scene.frame_end + 1):
        bpy.context.scene.set_frame(frame)
        fobj = obj.create_mesh(bpy.context.scene,True,'PREVIEW')
        fobj.calc_normals()
        nframe = md3Frame()
        nframe.name = str(frame)
        for vi in vertlist:
            vert = fobj.verts[vi]
            nvert = md3Vert()
            nvert.xyz = vert.co * obj.matrix_world
            nvert.xyz[0] = (round(nvert.xyz[0] + obj.matrix_world[3][0],5) * settings.scale) + settings.offsetx
            nvert.xyz[1] = (round(nvert.xyz[1] + obj.matrix_world[3][1],5) * settings.scale) + settings.offsety
            nvert.xyz[2] = (round(nvert.xyz[2] + obj.matrix_world[3][2],5) * settings.scale) + settings.offsetz
            nvert.normal = nvert.Encode(vert.normal)
            for i in range(0,3):
              nframe.mins[i] = min(nframe.mins[i],nvert.xyz[i])
              nframe.maxs[i] = max(nframe.maxs[i],nvert.xyz[i])
            minlength = math.sqrt(math.pow(nframe.mins[0],2) + math.pow(nframe.mins[1],2) + math.pow(nframe.mins[2],2))
            maxlength = math.sqrt(math.pow(nframe.maxs[0],2) + math.pow(nframe.maxs[1],2) + math.pow(nframe.maxs[2],2))
            nframe.radius = round(max(minlength,maxlength),5)
            nsurface.verts.append(nvert) 
        md3.frames.append(nframe)
        nsurface.numFrames += 1
        bpy.data.meshes.remove(fobj)
      md3.surfaces.append(nsurface)
      md3.numSurfaces += 1

    elif obj.type == 'EMPTY':
      md3.numTags += 1
      for frame in range(bpy.context.scene.frame_start,bpy.context.scene.frame_end + 1):
        bpy.context.scene.set_frame(frame)
        ntag = md3Tag()
        ntag.origin[0] = (round(obj.matrix_world[3][0] * settings.scale,5)) + settings.offsetx
        ntag.origin[1] = (round(obj.matrix_world[3][1] * settings.scale,5)) + settings.offsety
        ntag.origin[2] = (round(obj.matrix_world[3][2] * settings.scale,5)) + settings.offsetz
        ntag.axis[0] = obj.matrix_world[0][0]
        ntag.axis[1] = obj.matrix_world[0][1]
        ntag.axis[2] = obj.matrix_world[0][2]
        ntag.axis[3] = obj.matrix_world[1][0]
        ntag.axis[4] = obj.matrix_world[1][1]
        ntag.axis[5] = obj.matrix_world[1][2]
        ntag.axis[6] = obj.matrix_world[2][0]
        ntag.axis[7] = obj.matrix_world[2][1]
        ntag.axis[8] = obj.matrix_world[2][2]
        md3.tags.append(ntag)
  
  if md3.numSurfaces < 1:
    message(log,"Select a mesh to export!")
    if log:
      log.close()
    return

  file = open(settings.savepath, "wb")
  md3.Save(file)
  print_md3(log,md3,settings.dumpall)
  file.close()

  message(log,"MD3: " + settings.name + " saved to " + settings.savepath)
  if log:
    print("Logged to",settings.logpath)
    log.close()

from bpy.props import *
class ExportMD3(bpy.types.Operator):
  '''Export to Quake Model 3 (.md3)'''
  bl_idname = "export.md3"
  bl_label = 'Export MD3'

  filepath = StringProperty(subtype = 'FILE_PATH',name="File Path", description="Filepath for exporting", maxlen= 1024, default= "")
  md3name = StringProperty(name="MD3 Name", description="MD3 header name / skin path (64 bytes)",maxlen=64,default="")
  md3log = StringProperty(name="MD3 Log", description="MD3 log file path",maxlen=1024,default="export_md3.log")
  md3overwritelog = BoolProperty(name="Overwrite log", description="Overwrite log (off == append)", default=True)
  md3dumpall = BoolProperty(name="Dump all", description="Dump all data for md3 to log",default=False)
  md3ignoreuvs = BoolProperty(name="Ignore UVs", description="Ignores uv influence on mesh generation. Use if uv map not made.",default=False)
  md3scale = FloatProperty(name="Scale", description="Scale all objects from world origin (0,0,0)",default=1.0,precision=5)
  md3offsetx = FloatProperty(name="Offset X", description="Transition scene along x axis",default=0.0,precision=5)
  md3offsety = FloatProperty(name="Offset Y", description="Transition scene along y axis",default=0.0,precision=5)
  md3offsetz = FloatProperty(name="Offset Z", description="Transition scene along z axis",default=0.0,precision=5)

  def execute(self, context):
   settings = md3Settings(savepath = self.properties.filepath,
                          name = self.properties.md3name,
                          logpath = self.properties.md3log,
                          overwrite = self.properties.md3overwritelog,
                          dumpall = self.properties.md3dumpall,
                          ignoreuvs = self.properties.md3ignoreuvs,
                          scale = self.properties.md3scale,
                          offsetx = self.properties.md3offsetx,
                          offsety = self.properties.md3offsety,
                          offsetz = self.properties.md3offsetz)
   save_md3(settings)
   return {'FINISHED'}

  def invoke(self, context, event):
    wm = context.manager
    wm.add_fileselect(self)
    return {'RUNNING_MODAL'}

  def poll(self, context):
    return context.active_object != None

def menu_func(self, context):
  newpath = os.path.splitext(bpy.context.main.filepath)[0] + ".md3"
  self.layout.operator(ExportMD3.bl_idname, text="Quake Model 3 (.md3)").filepath = newpath 

def register():
  bpy.types.register(ExportMD3)
  bpy.types.INFO_MT_file_export.append(menu_func)

def unregister():
  bpy.types.unregister(ExportMD3)
  bpy.types.INFO_MT_file_export.remove(menu_func)

if __name__ == "__main__":
  register()