Fixes to Newell algorithm implementation

[vrm.git] / vrm.py

diff --git a/vrm.py b/vrm.py
index 726c83d..82922f8 100755 (executable)
--- a/vrm.py
+++ b/vrm.py
@@ -1,246 +1,2123 @@
 #!BPY
 #!BPY

-

 """
 Name: 'VRM'
 """
 Name: 'VRM'

-Blender: 237
-Group: 'Export'
-Tooltip: 'Vector Rendering Method Export Script'
+Blender: 242
+Group: 'Render'
+Tooltip: 'Vector Rendering Method script'
+"""
+
+__author__ = "Antonio Ospite"
+__url__ = ["http://projects.blender.org/projects/vrm"]
+__version__ = "0.3.beta"
+
+__bpydoc__ = """\
+    Render the scene and save the result in vector format.

 """
 
 """
 

+# ---------------------------------------------------------------------
+#    Copyright (c) 2006 Antonio Ospite
+#
+#    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 St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+# ---------------------------------------------------------------------
+#
+# Additional credits:
+#   Thanks to Emilio Aguirre for S2flender from which I took inspirations :)
+#   Thanks to Nikola Radovanovic, the author of the original VRM script,
+#       the code you read here has been rewritten _almost_ entirely
+#       from scratch but Nikola gave me the idea, so I thank him publicly.
+#
+# ---------------------------------------------------------------------
+# 
+# Things TODO for a next release:
+#   - FIX the issue with negative scales in object tranformations!
+#   - Use a better depth sorting algorithm
+#   - Implement clipping of primitives and do handle object intersections.
+#     (for now only clipping away whole objects is supported).
+#   - Review how selections are made (this script uses selection states of
+#     primitives to represent visibility infos)
+#   - Use a data structure other than Mesh to represent the 2D image? 
+#     Think to a way to merge (adjacent) polygons that have the same color.
+#     Or a way to use paths for silhouettes and contours.
+#   - Consider SMIL for animation handling instead of ECMA Script? (Firefox do
+#     not support SMIL for animations)
+#   - Switch to the Mesh structure, should be considerably faster
+#     (partially done, but with Mesh we cannot sort faces, yet)
+#   - Implement Edge Styles (silhouettes, contours, etc.) (partially done).
+#   - Implement Shading Styles? (partially done, to make more flexible).
+#   - Add Vector Writers other than SVG.
+#   - Check memory use!!
+#   - Support Indexed palettes!! (Useful for ILDA FILES, for example,
+#     see http://www.linux-laser.org/download/autotrace/ilda-output.patch)
+#
+# ---------------------------------------------------------------------
+#
+# Changelog:
+#
+#   vrm-0.3.py  - ...
+#     * First release after code restucturing.
+#       Now the script offers a useful set of functionalities
+#       and it can render animations, too.
+#     * Optimization in Renderer.doEdgeStyle(), build a topology cache
+#       so to speed up the lookup of adjacent faces of an edge.
+#       Thanks ideasman42.
+#     * The SVG output is now SVG 1.0 valid.
+#       Checked with: http://jiggles.w3.org/svgvalidator/ValidatorURI.html
+#     * Progress indicator during HSR.
+#
+# ---------------------------------------------------------------------
+

 import Blender
 import Blender

-from Blender import Scene, Object, Lamp, Camera
+from Blender import Scene, Object, Mesh, NMesh, Material, Lamp, Camera, Window
+from Blender.Mathutils import *

 from math import *
 from math import *

-from Blender.Window import *
-from Blender.Scene import Render
+import sys, time
+
+
+# Some global settings
+
+class config:
+    polygons = dict()
+    polygons['SHOW'] = True
+    polygons['SHADING'] = 'FLAT'
+    #polygons['HSR'] = 'PAINTER' # 'PAINTER' or 'NEWELL'
+    polygons['HSR'] = 'NEWELL'
+    # Hidden to the user for now
+    polygons['EXPANSION_TRICK'] = True
+
+    polygons['TOON_LEVELS'] = 2
+
+    edges = dict()
+    edges['SHOW'] = False
+    edges['SHOW_HIDDEN'] = False
+    edges['STYLE'] = 'MESH'
+    edges['WIDTH'] = 2
+    edges['COLOR'] = [0, 0, 0]
+
+    output = dict()
+    output['FORMAT'] = 'SVG'
+    output['ANIMATION'] = False
+    output['JOIN_OBJECTS'] = True
+
+
+
+# Utility functions
+print_debug = True
+def debug(msg):
+    if print_debug:
+        sys.stderr.write(msg)
+
+def sign(x):
+    if x == 0:
+        return 0
+    elif x < 0:
+        return -1
+    else:
+        return 1
+
+
+# ---------------------------------------------------------------------
+#
+## Mesh Utility class
+#
+# ---------------------------------------------------------------------
+class MeshUtils:
+
+    def buildEdgeFaceUsersCache(me):
+        ''' 
+        Takes a mesh and returns a list aligned with the meshes edges.
+        Each item is a list of the faces that use the edge
+        would be the equiv for having ed.face_users as a property
+
+        Taken from .blender/scripts/bpymodules/BPyMesh.py,
+        thanks to ideasman_42.
+        '''
+
+        def sorted_edge_indicies(ed):
+            i1= ed.v1.index
+            i2= ed.v2.index
+            if i1>i2:
+                i1,i2= i2,i1
+            return i1, i2
+
+       
+        face_edges_dict= dict([(sorted_edge_indicies(ed), (ed.index, [])) for ed in me.edges])
+        for f in me.faces:
+            fvi= [v.index for v in f.v]# face vert idx's
+            for i in xrange(len(f)):
+                i1= fvi[i]
+                i2= fvi[i-1]
+                
+                if i1>i2:
+                    i1,i2= i2,i1
+                
+                face_edges_dict[i1,i2][1].append(f)
+        
+        face_edges= [None] * len(me.edges)
+        for ed_index, ed_faces in face_edges_dict.itervalues():
+            face_edges[ed_index]= ed_faces
+        
+        return face_edges
+
+    def isMeshEdge(adjacent_faces):
+        """Mesh edge rule.
+
+        A mesh edge is visible if _at_least_one_ of its adjacent faces is selected.
+        Note: if the edge has no adjacent faces we want to show it as well,
+        useful for "edge only" portion of objects.
+        """
+
+        if len(adjacent_faces) == 0:
+            return True
+
+        selected_faces = [f for f in adjacent_faces if f.sel]
+
+        if len(selected_faces) != 0:
+            return True
+        else:
+            return False
+
+    def isSilhouetteEdge(adjacent_faces):
+        """Silhuette selection rule.

 
 

+        An edge is a silhuette edge if it is shared by two faces with
+        different selection status or if it is a boundary edge of a selected
+        face.
+        """

 
 

-# distance from camera Z'
-def Distance(PX,PY,PZ):
+        if ((len(adjacent_faces) == 1 and adjacent_faces[0].sel == 1) or
+            (len(adjacent_faces) == 2 and
+                adjacent_faces[0].sel != adjacent_faces[1].sel)
+            ):
+            return True
+        else:
+            return False
+
+    buildEdgeFaceUsersCache = staticmethod(buildEdgeFaceUsersCache)
+    isMeshEdge = staticmethod(isMeshEdge)
+    isSilhouetteEdge = staticmethod(isSilhouetteEdge)
+
+
+# ---------------------------------------------------------------------
+#
+## Shading Utility class
+#
+# ---------------------------------------------------------------------
+class ShadingUtils:
+
+    shademap = None
+
+    def toonShadingMapSetup():
+        levels = config.polygons['TOON_LEVELS']
+
+        texels = 2*levels - 1
+        tmp_shademap = [0.0] + [(i)/float(texels-1) for i in xrange(1, texels-1) ] + [1.0]
+
+        return tmp_shademap
+
+    def toonShading(u):
+
+        shademap = ShadingUtils.shademap
+
+        if not shademap:
+            shademap = ShadingUtils.toonShadingMapSetup()
+
+        v = 1.0
+        for i in xrange(0, len(shademap)-1):
+            pivot = (shademap[i]+shademap[i+1])/2.0
+            j = int(u>pivot)
+
+            v = shademap[i+j]
+
+            if v < shademap[i+1]:
+                return v
+
+        return v
+
+    toonShadingMapSetup = staticmethod(toonShadingMapSetup)
+    toonShading = staticmethod(toonShading)
+
+
+# ---------------------------------------------------------------------
+#
+## Projections classes
+#
+# ---------------------------------------------------------------------
+
+class Projector:
+    """Calculate the projection of an object given the camera.
+    
+    A projector is useful to so some per-object transformation to obtain the
+    projection of an object given the camera.

     
     

-    dist = sqrt(PX*PX+PY*PY+PZ*PZ)
-    return dist
+    The main method is #doProjection# see the method description for the
+    parameter list.
+    """
+
+    def __init__(self, cameraObj, canvasRatio):
+        """Calculate the projection matrix.
+
+        The projection matrix depends, in this case, on the camera settings.
+        TAKE CARE: This projector expects vertices in World Coordinates!
+        """
+
+        camera = cameraObj.getData()
+
+        aspect = float(canvasRatio[0])/float(canvasRatio[1])
+        near = camera.clipStart
+        far = camera.clipEnd
+
+        scale = float(camera.scale)
+
+        fovy = atan(0.5/aspect/(camera.lens/32))
+        fovy = fovy * 360.0/pi
+        
+        # What projection do we want?
+        if camera.type == 0:
+            mP = self._calcPerspectiveMatrix(fovy, aspect, near, far) 
+        elif camera.type == 1:
+            mP = self._calcOrthoMatrix(fovy, aspect, near, far, scale) 
+        
+        # View transformation
+        cam = Matrix(cameraObj.getInverseMatrix())
+        cam.transpose() 
+        
+        mP = mP * cam
+
+        self.projectionMatrix = mP
+
+    ##
+    # Public methods
+    #
+
+    def doProjection(self, v):
+        """Project the point on the view plane.
+
+        Given a vertex calculate the projection using the current projection
+        matrix.
+        """
+        
+        # Note that we have to work on the vertex using homogeneous coordinates
+        # From blender 2.42+ we don't need to resize the vector to be 4d
+        # when applying a 4x4 matrix, but we do that anyway since we need the
+        # 4th coordinate later
+        p = self.projectionMatrix * Vector(v).resize4D()
+        
+        # Perspective division
+        if p[3] != 0:
+            p[0] = p[0]/p[3]
+            p[1] = p[1]/p[3]
+            p[2] = p[2]/p[3]

 
 

-def RotatePoint(PX,PY,PZ,AngleX,AngleY,AngleZ):
+        # restore the size
+        p[3] = 1.0
+        p.resize3D()
+
+        return p
+
+
+    ##
+    # Private methods
+    #

     
     

-    NewPoint = []
-    # Rotate X
-    NewY = (PY * cos(AngleX))-(PZ * sin(AngleX))
-    NewZ = (PZ * cos(AngleX))+(PY * sin(AngleX))
-    # Rotate Y
-    PZ = NewZ
-    PY = NewY
-    NewZ = (PZ * cos(AngleY))-(PX * sin(AngleY))
-    NewX = (PX * cos(AngleY))+(PZ * sin(AngleY))
-    PX = NewX
-    PZ = NewZ
-    # Rotate Z
-    NewX = (PX * cos(AngleZ))-(PY * sin(AngleZ))
-    NewY = (PY * cos(AngleZ))+(PX * sin(AngleZ))
-    NewPoint.append(NewX)
-    NewPoint.append(NewY)
-    NewPoint.append(NewZ)
-    return NewPoint
-
-def vetmatmult(v, M):
+    def _calcPerspectiveMatrix(self, fovy, aspect, near, far):
+        """Return a perspective projection matrix.
+        """
+        
+        top = near * tan(fovy * pi / 360.0)
+        bottom = -top
+        left = bottom*aspect
+        right= top*aspect
+        x = (2.0 * near) / (right-left)
+        y = (2.0 * near) / (top-bottom)
+        a = (right+left) / (right-left)
+        b = (top+bottom) / (top - bottom)
+        c = - ((far+near) / (far-near))
+        d = - ((2*far*near)/(far-near))
+        
+        m = Matrix(
+                [x,   0.0,    a,    0.0],
+                [0.0,   y,    b,    0.0],
+                [0.0, 0.0,    c,      d],
+                [0.0, 0.0, -1.0,    0.0])
+
+        return m
+
+    def _calcOrthoMatrix(self, fovy, aspect , near, far, scale):
+        """Return an orthogonal projection matrix.
+        """
+        
+        # The 11 in the formula was found emiprically
+        top = near * tan(fovy * pi / 360.0) * (scale * 11)
+        bottom = -top 
+        left = bottom * aspect
+        right= top * aspect
+        rl = right-left
+        tb = top-bottom
+        fn = near-far 
+        tx = -((right+left)/rl)
+        ty = -((top+bottom)/tb)
+        tz = ((far+near)/fn)
+
+        m = Matrix(
+                [2.0/rl, 0.0,    0.0,     tx],
+                [0.0,    2.0/tb, 0.0,     ty],
+                [0.0,    0.0,    2.0/fn,  tz],
+                [0.0,    0.0,    0.0,    1.0])
+        
+        return m
+
+
+# ---------------------------------------------------------------------
+#
+## Progress Indicator
+#
+# ---------------------------------------------------------------------
+
+class Progress:
+    """A model for a progress indicator.

     
     

-    v2 = [0, 0, 0, 0]
+    Do the progress calculation calculation and
+    the view independent stuff of a progress indicator.
+    """
+    def __init__(self, steps=0):
+        self.name = ""
+        self.steps = steps
+        self.completed = 0
+        self.progress = 0
+
+    def setSteps(self, steps):
+        """Set the number of steps of the activity wich we want to track.
+        """
+        self.steps = steps
+
+    def getSteps(self):
+        return self.steps
+
+    def setName(self, name):
+        """Set the name of the activity wich we want to track.
+        """
+        self.name = name
+
+    def getName(self):
+        return self.name
+
+    def getProgress(self):
+        return self.progress
+
+    def reset(self):
+        self.completed = 0
+        self.progress = 0
+
+    def update(self):
+        """Update the model, call this method when one step is completed.
+        """
+        if self.progress == 100:
+            return False
+
+        self.completed += 1
+        self.progress = ( float(self.completed) / float(self.steps) ) * 100
+        self.progress = int(self.progress)
+
+        return True
+
+
+class ProgressIndicator:
+    """An abstraction of a View for the Progress Model
+    """
+    def __init__(self):
+
+        # Use a refresh rate so we do not show the progress at
+        # every update, but every 'self.refresh_rate' times.
+        self.refresh_rate = 10
+        self.shows_counter = 0
+
+        self.quiet = False
+
+        self.progressModel = None
+
+    def setQuiet(self, value):
+        self.quiet = value
+
+    def setActivity(self, name, steps):
+        """Initialize the Model.
+
+        In a future version (with subactivities-progress support) this method
+        could only set the current activity.
+        """
+        self.progressModel = Progress()
+        self.progressModel.setName(name)
+        self.progressModel.setSteps(steps)
+
+    def getActivity(self):
+        return self.progressModel
+
+    def update(self):
+        """Update the model and show the actual progress.
+        """
+        assert(self.progressModel)
+
+        if self.progressModel.update():
+            if self.quiet:
+                return
+
+            self.show(self.progressModel.getProgress(),
+                    self.progressModel.getName())
+
+        # We return always True here so we can call the update() method also
+        # from lambda funcs (putting the call in logical AND with other ops)
+        return True
+
+    def show(self, progress, name=""):
+        self.shows_counter = (self.shows_counter + 1) % self.refresh_rate
+        if self.shows_counter != 0:
+            return
+
+        if progress == 100:
+            self.shows_counter = -1
+
+
+class ConsoleProgressIndicator(ProgressIndicator):
+    """Show a progress bar on stderr, a la wget.
+    """
+    def __init__(self):
+        ProgressIndicator.__init__(self)
+
+        self.swirl_chars = ["-", "\\", "|", "/"]
+        self.swirl_count = -1
+
+    def show(self, progress, name):
+        ProgressIndicator.show(self, progress, name)
+        
+        bar_length = 70
+        bar_progress = int( (progress/100.0) * bar_length )
+        bar = ("=" * bar_progress).ljust(bar_length)
+
+        self.swirl_count = (self.swirl_count+1)%len(self.swirl_chars)
+        swirl_char = self.swirl_chars[self.swirl_count]
+
+        progress_bar = "%s |%s| %c %3d%%" % (name, bar, swirl_char, progress)
+
+        sys.stderr.write(progress_bar+"\r")
+        if progress == 100:
+            sys.stderr.write("\n")
+
+
+class GraphicalProgressIndicator(ProgressIndicator):
+    """Interface to the Blender.Window.DrawProgressBar() method.
+    """
+    def __init__(self):
+        ProgressIndicator.__init__(self)
+
+        #self.swirl_chars = ["-", "\\", "|", "/"]
+        # We have to use letters with the same width, for now!
+        # Blender progress bar considers the font widths when
+        # calculating the progress bar width.
+        self.swirl_chars = ["\\", "/"]
+        self.swirl_count = -1
+
+    def show(self, progress, name):
+        ProgressIndicator.show(self, progress)
+
+        self.swirl_count = (self.swirl_count+1)%len(self.swirl_chars)
+        swirl_char = self.swirl_chars[self.swirl_count]
+
+        progress_text = "%s - %c %3d%%" % (name, swirl_char, progress)
+
+        # Finally draw  the Progress Bar
+        Window.WaitCursor(1) # Maybe we can move that call in the constructor?
+        Window.DrawProgressBar(progress/100.0, progress_text)
+
+        if progress == 100:
+            Window.DrawProgressBar(1, progress_text)
+            Window.WaitCursor(0)
+
+
+
+# ---------------------------------------------------------------------
+#
+## 2D Object representation class
+#
+# ---------------------------------------------------------------------
+
+# TODO: a class to represent the needed properties of a 2D vector image
+# For now just using a [N]Mesh structure.
+
+
+# ---------------------------------------------------------------------
+#
+## Vector Drawing Classes
+#
+# ---------------------------------------------------------------------
+
+## A generic Writer
+
+class VectorWriter:
+    """
+    A class for printing output in a vectorial format.
+
+    Given a 2D representation of the 3D scene the class is responsible to
+    write it is a vector format.
+
+    Every subclasses of VectorWriter must have at last the following public
+    methods:
+        - open(self)
+        - close(self)
+        - printCanvas(self, scene,
+            doPrintPolygons=True, doPrintEdges=False, showHiddenEdges=False):
+    """

     
     

-    for i in range(0, 3):
-        for j in range(0, 3):
-            v2[i] += (v[i]*M[i][j])
+    def __init__(self, fileName):
+        """Set the output file name and other properties"""

 
 

-    return v2
+        self.outputFileName = fileName
+        self.file = None
+        
+        context = Scene.GetCurrent().getRenderingContext()
+        self.canvasSize = ( context.imageSizeX(), context.imageSizeY() )

 
 

-def flatern(vertx, verty, vertz):
+        self.startFrame = 1
+        self.endFrame = 1
+        self.animation = False

 
 

-    cam = Camera.get()            # Get the cameras in scene
-    Lens = cam[0].getLens()       # The First Blender camera lens

 
 

-    camTyp = cam[0].getType()
+    ##
+    # Public Methods
+    #
+    
+    def open(self, startFrame=1, endFrame=1):
+        if startFrame != endFrame:
+            self.startFrame = startFrame
+            self.endFrame = endFrame
+            self.animation = True
+
+        self.file = open(self.outputFileName, "w")
+        print "Outputting to: ", self.outputFileName
+
+        return
+
+    def close(self):
+        self.file.close()
+        return
+
+    def printCanvas(self, scene, doPrintPolygons=True, doPrintEdges=False,
+            showHiddenEdges=False):
+        """This is the interface for the needed printing routine.
+        """
+        return
+        
+
+## SVG Writer
+
+class SVGVectorWriter(VectorWriter):
+    """A concrete class for writing SVG output.
+    """
+
+    def __init__(self, fileName):
+        """Simply call the parent Contructor.
+        """
+        VectorWriter.__init__(self, fileName)
+
+
+    ##
+    # Public Methods
+    #
+
+    def open(self, startFrame=1, endFrame=1):
+        """Do some initialization operations.
+        """
+        VectorWriter.open(self, startFrame, endFrame)
+        self._printHeader()
+
+    def close(self):
+        """Do some finalization operation.
+        """
+        self._printFooter()
+
+        # remember to call the close method of the parent
+        VectorWriter.close(self)
+
+        
+    def printCanvas(self, scene, doPrintPolygons=True, doPrintEdges=False,
+            showHiddenEdges=False):
+        """Convert the scene representation to SVG.
+        """
+
+        Objects = scene.getChildren()

 
 

-    msize = (context.imageSizeX(), context.imageSizeY())
-    xres = msize[0]             # X res for output
-    yres = msize[1]                # Y res for output
-    ratio = xres/yres
+        context = scene.getRenderingContext()
+        framenumber = context.currentFrame()

 
 

-    fov = atan(ratio * 16.0 / Lens)  # Get fov stuff
+        if self.animation:
+            framestyle = "display:none"
+        else:
+            framestyle = "display:block"
+        
+        # Assign an id to this group so we can set properties on it using DOM
+        self.file.write("<g id=\"frame%d\" style=\"%s\">\n" %
+                (framenumber, framestyle) )
+
+
+        for obj in Objects:
+
+            if(obj.getType() != 'Mesh'):
+                continue
+
+            self.file.write("<g id=\"%s\">\n" % obj.getName())
+
+            mesh = obj.getData(mesh=1)
+
+            if doPrintPolygons:
+                self._printPolygons(mesh)
+
+            if doPrintEdges:
+                self._printEdges(mesh, showHiddenEdges)
+            
+            self.file.write("</g>\n")
+
+        self.file.write("</g>\n")
+
+    
+    ##  
+    # Private Methods
+    #

     
     

-    dist = xres/2*tan(fov)         # Calculate dist from pinhole camera to image plane
+    def _calcCanvasCoord(self, v):
+        """Convert vertex in scene coordinates to canvas coordinates.
+        """
+
+        pt = Vector([0, 0, 0])
+        
+        mW = float(self.canvasSize[0])/2.0
+        mH = float(self.canvasSize[1])/2.0
+
+        # rescale to canvas size
+        pt[0] = v.co[0]*mW + mW
+        pt[1] = v.co[1]*mH + mH
+        pt[2] = v.co[2]
+         
+        # For now we want (0,0) in the top-left corner of the canvas.
+        # Mirror and translate along y
+        pt[1] *= -1
+        pt[1] += self.canvasSize[1]
+        
+        return pt
+
+    def _printHeader(self):
+        """Print SVG header."""
+
+        self.file.write("<?xml version=\"1.0\"?>\n")
+        self.file.write("<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.0//EN\"\n")
+        self.file.write("\t\"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd\">\n")
+        self.file.write("<svg version=\"1.0\"\n")
+        self.file.write("\txmlns=\"http://www.w3.org/2000/svg\"\n")
+        self.file.write("\twidth=\"%d\" height=\"%d\">\n\n" %
+                self.canvasSize)
+
+        if self.animation:
+
+            self.file.write("""\n<script type="text/javascript"><![CDATA[
+            globalStartFrame=%d;
+            globalEndFrame=%d;
+
+            /* FIXME: Use 1000 as interval as lower values gives problems */
+            timerID = setInterval("NextFrame()", 1000);
+            globalFrameCounter=%d;
+
+            function NextFrame()
+            {
+              currentElement  = document.getElementById('frame'+globalFrameCounter)
+              previousElement = document.getElementById('frame'+(globalFrameCounter-1))
+
+              if (!currentElement)
+              {
+                return;
+              }
+
+              if (globalFrameCounter > globalEndFrame)
+              {
+                clearInterval(timerID)
+              }
+              else
+              {
+                if(previousElement)
+                {
+                    previousElement.style.display="none";
+                }
+                currentElement.style.display="block";
+                globalFrameCounter++;
+              }
+            }
+            \n]]></script>\n
+            \n""" % (self.startFrame, self.endFrame, self.startFrame) )
+                
+    def _printFooter(self):
+        """Print the SVG footer."""
+
+        self.file.write("\n</svg>\n")
+
+    def _printPolygons(self, mesh): 
+        """Print the selected (visible) polygons.
+        """
+
+        if len(mesh.faces) == 0:
+            return
+
+        self.file.write("<g>\n")
+
+        for face in mesh.faces:
+            if not face.sel:
+               continue
+
+            self.file.write("<path d=\"")
+
+            p = self._calcCanvasCoord(face.verts[0])
+            self.file.write("M %g,%g L " % (p[0], p[1]))
+
+            for v in face.verts[1:]:
+                p = self._calcCanvasCoord(v)
+                self.file.write("%g,%g " % (p[0], p[1]))
+            
+            # get rid of the last blank space, just cosmetics here.
+            self.file.seek(-1, 1) 
+            self.file.write(" z\"\n")
+            
+            # take as face color the first vertex color
+            if face.col:
+                fcol = face.col[0]
+                color = [fcol.r, fcol.g, fcol.b, fcol.a]
+            else:
+                color = [255, 255, 255, 255]
+
+            # Convert the color to the #RRGGBB form
+            str_col = "#%02X%02X%02X" % (color[0], color[1], color[2])
+
+            # Handle transparent polygons
+            opacity_string = ""
+            if color[3] != 255:
+                opacity = float(color[3])/255.0
+                opacity_string = " fill-opacity: %g; stroke-opacity: %g; opacity: 1;" % (opacity, opacity)
+
+            self.file.write("\tstyle=\"fill:" + str_col + ";")
+            self.file.write(opacity_string)
+
+            # use the stroke property to alleviate the "adjacent edges" problem,
+            # we simulate polygon expansion using borders,
+            # see http://www.antigrain.com/svg/index.html for more info
+            stroke_width = 1.0
+
+            if config.polygons['EXPANSION_TRICK']:
+                str_col = "#000000" # For debug
+                self.file.write(" stroke:%s;\n" % str_col)
+                self.file.write(" stroke-width:" + str(stroke_width) + ";\n")
+                self.file.write(" stroke-linecap:round;stroke-linejoin:round")
+
+            self.file.write("\"/>\n")
+
+        self.file.write("</g>\n")
+
+    def _printEdges(self, mesh, showHiddenEdges=False):
+        """Print the wireframe using mesh edges.
+        """
+
+        stroke_width = config.edges['WIDTH']
+        stroke_col = config.edges['COLOR']
+        
+        self.file.write("<g>\n")
+
+        for e in mesh.edges:
+            
+            hidden_stroke_style = ""
+            
+            if e.sel == 0:
+                if showHiddenEdges == False:
+                    continue
+                else:
+                    hidden_stroke_style = ";\n stroke-dasharray:3, 3"
+
+            p1 = self._calcCanvasCoord(e.v1)
+            p2 = self._calcCanvasCoord(e.v2)
+            
+            self.file.write("<line x1=\"%g\" y1=\"%g\" x2=\"%g\" y2=\"%g\"\n"
+                    % ( p1[0], p1[1], p2[0], p2[1] ) )
+            self.file.write(" style=\"stroke:rgb("+str(stroke_col[0])+","+str(stroke_col[1])+","+str(stroke_col[2])+");")
+            self.file.write(" stroke-width:"+str(stroke_width)+";\n")
+            self.file.write(" stroke-linecap:round;stroke-linejoin:round")
+            self.file.write(hidden_stroke_style)
+            self.file.write("\"/>\n")
+
+        self.file.write("</g>\n")
+
+
+# ---------------------------------------------------------------------
+#
+## Rendering Classes
+#
+# ---------------------------------------------------------------------
+
+# A dictionary to collect different shading style methods
+shadingStyles = dict()
+shadingStyles['FLAT'] = None
+shadingStyles['TOON'] = None
+
+# A dictionary to collect different edge style methods
+edgeStyles = dict()
+edgeStyles['MESH'] = MeshUtils.isMeshEdge
+edgeStyles['SILHOUETTE'] = MeshUtils.isSilhouetteEdge
+
+# A dictionary to collect the supported output formats
+outputWriters = dict()
+outputWriters['SVG'] = SVGVectorWriter
+
+
+class Renderer:
+    """Render a scene viewed from the active camera.
+    
+    This class is responsible of the rendering process, transformation and
+    projection of the objects in the scene are invoked by the renderer.
+
+    The rendering is done using the active camera for the current scene.
+    """
+
+    def __init__(self):
+        """Make the rendering process only for the current scene by default.
+
+        We will work on a copy of the scene, to be sure that the current scene do
+        not get modified in any way.
+        """
+
+        # Render the current Scene, this should be a READ-ONLY property
+        self._SCENE = Scene.GetCurrent()
+        
+        # Use the aspect ratio of the scene rendering context
+        context = self._SCENE.getRenderingContext()
+
+        aspect_ratio = float(context.imageSizeX())/float(context.imageSizeY())
+        self.canvasRatio = (float(context.aspectRatioX())*aspect_ratio,
+                            float(context.aspectRatioY())
+                            )
+
+        # Render from the currently active camera 
+        self.cameraObj = self._SCENE.getCurrentCamera()
+
+        # Get a projector for this camera.
+        # NOTE: the projector wants object in world coordinates,
+        # so we should remember to apply modelview transformations
+        # _before_ we do projection transformations.
+        self.proj = Projector(self.cameraObj, self.canvasRatio)
+
+        # Get the list of lighting sources
+        obj_lst = self._SCENE.getChildren()
+        self.lights = [ o for o in obj_lst if o.getType() == 'Lamp']
+
+        # When there are no lights we use a default lighting source
+        # that have the same position of the camera
+        if len(self.lights) == 0:
+            l = Lamp.New('Lamp')
+            lobj = Object.New('Lamp')
+            lobj.loc = self.cameraObj.loc
+            lobj.link(l) 
+            self.lights.append(lobj)
+
+
+    ##
+    # Public Methods
+    #
+
+    def doRendering(self, outputWriter, animation=False):
+        """Render picture or animation and write it out.
+        
+        The parameters are:
+            - a Vector writer object that will be used to output the result.
+            - a flag to tell if we want to render an animation or only the
+              current frame.
+        """
+        
+        context = self._SCENE.getRenderingContext()
+        origCurrentFrame = context.currentFrame()
+
+        # Handle the animation case
+        if not animation:
+            startFrame = origCurrentFrame
+            endFrame = startFrame
+            outputWriter.open()
+        else:
+            startFrame = context.startFrame()
+            endFrame = context.endFrame()
+            outputWriter.open(startFrame, endFrame)
+        
+        # Do the rendering process frame by frame
+        print "Start Rendering of %d frames" % (endFrame-startFrame)
+        for f in xrange(startFrame, endFrame+1):
+            print "\n\nFrame: %d" % f
+            context.currentFrame(f)
+
+            # Use some temporary workspace, a full copy of the scene
+            inputScene = self._SCENE.copy(2)
+            # And Set our camera accordingly
+            self.cameraObj = inputScene.getCurrentCamera()
+
+            try:
+                renderedScene = self.doRenderScene(inputScene)
+            except :
+                print "There was an error! Aborting."
+                import traceback
+                print traceback.print_exc()
+
+                self._SCENE.makeCurrent()
+                Scene.unlink(inputScene)
+                del inputScene
+                return
+
+            outputWriter.printCanvas(renderedScene,
+                    doPrintPolygons = config.polygons['SHOW'],
+                    doPrintEdges    = config.edges['SHOW'],
+                    showHiddenEdges = config.edges['SHOW_HIDDEN'])
+            
+            # delete the rendered scene
+            self._SCENE.makeCurrent()
+            Scene.unlink(renderedScene)
+            del renderedScene
+
+        outputWriter.close()
+        print "Done!"
+        context.currentFrame(origCurrentFrame)
+
+
+    def doRenderScene(self, workScene):
+        """Control the rendering process.
+        
+        Here we control the entire rendering process invoking the operation
+        needed to transform and project the 3D scene in two dimensions.
+        """
+        
+        # global processing of the scene
+
+        self._doSceneClipping(workScene)
+
+        self._doConvertGeometricObjsToMesh(workScene)
+
+        if config.output['JOIN_OBJECTS']:
+            self._joinMeshObjectsInScene(workScene)
+
+        self._doSceneDepthSorting(workScene)
+        
+        # Per object activities
+
+        Objects = workScene.getChildren()
+        print "Total Objects: %d" % len(Objects)
+        for i,obj in enumerate(Objects):
+            print "\n\n-------"
+            print "Rendering Object: %d" % i
+
+            if obj.getType() != 'Mesh':
+                print "Only Mesh supported! - Skipping type:", obj.getType()
+                continue
+
+            print "Rendering: ", obj.getName()
+
+            mesh = obj.getData(mesh=1)
+
+            self._doModelingTransformation(mesh, obj.matrix)
+
+            self._doBackFaceCulling(mesh)
+            if True:
+                for f in mesh.faces:
+                    f.sel = 1-f.sel
+                mesh.flipNormals()
+                for f in mesh.faces:
+                    f.sel = 1
+
+
+            self._doLighting(mesh)
+
+            # Do "projection" now so we perform further processing
+            # in Normalized View Coordinates
+            self._doProjection(mesh, self.proj)
+
+            self._doViewFrustumClipping(mesh)
+
+            self._doHiddenSurfaceRemoval(mesh)
+
+            self._doEdgesStyle(mesh, edgeStyles[config.edges['STYLE']])
+
+            
+            # Update the object data, important! :)
+            mesh.update()
+
+        return workScene
+
+
+    ##
+    # Private Methods
+    #
+
+    # Utility methods
+
+    def _getObjPosition(self, obj):
+        """Return the obj position in World coordinates.
+        """
+        return obj.matrix.translationPart()
+
+    def _cameraViewVector(self):
+        """Get the View Direction form the camera matrix.
+        """
+        return Vector(self.cameraObj.matrix[2]).resize3D()

 
 

-    screenxy=[0,0]
-    x=-vertx
-    y=verty
-    z=vertz

 
 

-    #----------------------------        
-    # calculate x'=dist*x/z & y'=dist*x/z
-    #----------------------------
-    screenxy[0]=int(xres/2.0+4*x*dist/z)
-    screenxy[1]=int(yres/2.0+4*y*dist/z)
-    return screenxy
+    # Faces methods

 
 

+    def _isFaceVisible(self, face):
+        """Determine if a face of an object is visible from the current camera.
+        
+        The view vector is calculated from the camera location and one of the
+        vertices of the face (expressed in World coordinates, after applying
+        modelview transformations).

 
 

-########
-# Main #
-########
+        After those transformations we determine if a face is visible by
+        computing the angle between the face normal and the view vector, this
+        angle has to be between -90 and 90 degrees for the face to be visible.
+        This corresponds somehow to the dot product between the two, if it
+        results > 0 then the face is visible.

 
 

-scena = Scene.GetCurrent()
-context = scena.getRenderingContext()
-renderDir = context.getRenderPath()
+        There is no need to normalize those vectors since we are only interested in
+        the sign of the cross product and not in the product value.

 
 

-msize = (context.imageSizeX(), context.imageSizeY())
+        NOTE: here we assume the face vertices are in WorldCoordinates, so
+        please transform the object _before_ doing the test.
+        """

 
 

-file=open("proba.svg","w")
+        normal = Vector(face.no)
+        camPos = self._getObjPosition(self.cameraObj)
+        view_vect = None

 
 

-file.write("<?xml version=\"1.0\"?>\n")
-file.write("<svg width=\"" + `msize[0]` + "\" height=\"" + `msize[1]` + "\"\n")
-file.write("\txmlns=\"http://www.w3.org/2000/svg\" version=\"1.2\" streamable=\"true\">\n")
-#file.write("<pageSet>\n")
+        # View Vector in orthographics projections is the view Direction of
+        # the camera
+        if self.cameraObj.data.getType() == 1:
+            view_vect = self._cameraViewVector()

 
 

-Objects = Blender.Object.Get()
-NUMobjects = len(Objects)
+        # View vector in perspective projections can be considered as
+        # the difference between the camera position and one point of
+        # the face, we choose the farthest point from the camera.
+        if self.cameraObj.data.getType() == 0:
+            vv = max( [ ((camPos - Vector(v.co)).length, (camPos - Vector(v.co))) for v in face] )
+            view_vect = vv[1]

 
 

-startFrm = context.startFrame()
-endFrm = startFrm
-#endFrm = context.endFrame()
-frames = range(startFrm, endFrm+1)

 
 

-# are we rendering an animation ?
-animation = (len(frames) > 1)
+        # if d > 0 the face is visible from the camera
+        d = view_vect * normal
+        
+        if d > 0:
+            return True
+        else:
+            return False

 
 

-camera = scena.getCurrentCamera() # Get the current camera

 
 

-for f in frames:
-    context.currentFrame(f)
-    Blender.Set('curframe', f)
+    # Scene methods

 
 

-    DrawProgressBar (f/len(frames),"Rendering ..." + str(f))
+    def _doSceneClipping(self, scene):
+        """Clip whole objects against the View Frustum.

 
 

-    print "Frame: ", f, "\n"
-    if animation :
-        file.write("<g id=\"Frame" + str(f) + "\" style=\"visibility:hidden\">\n")
+        For now clip away only objects according to their center position.
+        """

 
 

-    for o in Objects:
+        cpos = self._getObjPosition(self.cameraObj)
+        view_vect = self._cameraViewVector()

 
 

-        if o.getType() == "Mesh":
+        near = self.cameraObj.data.clipStart
+        far  = self.cameraObj.data.clipEnd

 
 

-            obj = o                  # Get the first selected object
-            objname = obj.name                # The object name
+        aspect = float(self.canvasRatio[0])/float(self.canvasRatio[1])
+        fovy = atan(0.5/aspect/(self.cameraObj.data.lens/32))
+        fovy = fovy * 360.0/pi

 
 

+        Objects = scene.getChildren()
+        for o in Objects:
+            if o.getType() != 'Mesh': continue;

 
 

-            OBJmesh = obj.getData()           # Get the mesh data for the object
-            meshfaces = OBJmesh.faces        # The number of faces in the object
+            obj_vect = Vector(cpos) - self._getObjPosition(o)

 
 

-            #------------
-            # Get the Material Colors
-            #------------
+            d = obj_vect*view_vect
+            theta = AngleBetweenVecs(obj_vect, view_vect)

             
             

-            #MATinfo = OBJmesh.getMaterials()
-            #    
-            #if len(MATinfo) > 0:
-            #    RGB=MATinfo[0].rgbCol
-            #    R=int(RGB[0]*255)
-            #    G=int(RGB[1]*255)
-            #    B=int(RGB[2]*255)
-            #    color=`R`+"."+`G`+"."+`B`
-            #    print color
-            #else:
-            #    color="100.100.100"
-
-
-            for face in range(0, len(meshfaces)):
-                numvert = len(OBJmesh.faces[face])
+            # if the object is outside the view frustum, clip it away
+            if (d < near) or (d > far) or (theta > fovy):
+                scene.unlink(o)
+
+    def _doConvertGeometricObjsToMesh(self, scene):
+        """Convert all "geometric" objects to mesh ones.
+        """
+        #geometricObjTypes = ['Mesh', 'Surf', 'Curve', 'Text']
+        geometricObjTypes = ['Mesh', 'Surf', 'Curve']
+
+        Objects = scene.getChildren()
+        objList = [ o for o in Objects if o.getType() in geometricObjTypes ]
+        for obj in objList:
+            old_obj = obj
+            obj = self._convertToRawMeshObj(obj)
+            scene.link(obj)
+            scene.unlink(old_obj)
+
+
+            # XXX Workaround for Text and Curve which have some normals
+            # inverted when they are converted to Mesh, REMOVE that when
+            # blender will fix that!!
+            if old_obj.getType() in ['Curve', 'Text']:
+                me = obj.getData(mesh=1)
+                for f in me.faces: f.sel = 1;
+                for v in me.verts: v.sel = 1;
+                me.remDoubles(0)
+                me.triangleToQuad()
+                me.recalcNormals()
+                me.update()
+
+
+    def _doSceneDepthSorting(self, scene):
+        """Sort objects in the scene.
+
+        The object sorting is done accordingly to the object centers.
+        """
+
+        c = self._getObjPosition(self.cameraObj)
+
+        by_center_pos = (lambda o1, o2:
+                (o1.getType() == 'Mesh' and o2.getType() == 'Mesh') and
+                cmp((self._getObjPosition(o1) - Vector(c)).length,
+                    (self._getObjPosition(o2) - Vector(c)).length)
+            )
+
+        # TODO: implement sorting by bounding box, if obj1.bb is inside obj2.bb,
+        # then ob1 goes farther than obj2, useful when obj2 has holes
+        by_bbox = None
+        
+        Objects = scene.getChildren()
+        Objects.sort(by_center_pos)
+        
+        # update the scene
+        for o in Objects:
+            scene.unlink(o)
+            scene.link(o)
+
+    def _joinMeshObjectsInScene(self, scene):
+        """Merge all the Mesh Objects in a scene into a single Mesh Object.
+        """
+
+        oList = [o for o in scene.getChildren() if o.getType()=='Mesh']
+
+        # FIXME: Object.join() do not work if the list contains 1 object
+        if len(oList) == 1:
+            return
+
+        mesh = Mesh.New('BigOne')
+        bigObj = Object.New('Mesh', 'BigOne')
+        bigObj.link(mesh)
+
+        scene.link(bigObj)
+
+        try:
+            bigObj.join(oList)
+        except RuntimeError:
+            print "\nWarning! - Can't Join Objects\n"
+            scene.unlink(bigObj)
+            return
+        except TypeError:
+            print "Objects Type error?"
+        
+        for o in oList:
+            scene.unlink(o)
+
+        scene.update()
+
+ 
+    # Per object/mesh methods
+
+    def _convertToRawMeshObj(self, object):
+        """Convert geometry based object to a mesh object.
+        """
+        me = Mesh.New('RawMesh_'+object.name)
+        me.getFromObject(object.name)
+
+        newObject = Object.New('Mesh', 'RawMesh_'+object.name)
+        newObject.link(me)
+
+        # If the object has no materials set a default material
+        if not me.materials:
+            me.materials = [Material.New()]
+            #for f in me.faces: f.mat = 0
+
+        newObject.setMatrix(object.getMatrix())
+
+        return newObject
+
+    def _doModelingTransformation(self, mesh, matrix):
+        """Transform object coordinates to world coordinates.
+
+        This step is done simply applying to the object its tranformation
+        matrix and recalculating its normals.
+        """
+        # XXX FIXME: blender do not transform normals in the right way when
+        # there are negative scale values
+        if matrix[0][0] < 0 or matrix[1][1] < 0 or matrix[2][2] < 0:
+            print "WARNING: Negative scales, expect incorrect results!"
+
+        mesh.transform(matrix, True)
+
+    def _doBackFaceCulling(self, mesh):
+        """Simple Backface Culling routine.
+        
+        At this level we simply do a visibility test face by face and then
+        select the vertices belonging to visible faces.
+        """
+        
+        # Select all vertices, so edges can be displayed even if there are no
+        # faces
+        for v in mesh.verts:
+            v.sel = 1
+        
+        Mesh.Mode(Mesh.SelectModes['FACE'])
+        # Loop on faces
+        for f in mesh.faces:
+            f.sel = 0
+            if self._isFaceVisible(f):
+                f.sel = 1
+
+    def _doLighting(self, mesh):
+        """Apply an Illumination and shading model to the object.
+
+        The model used is the Phong one, it may be inefficient,
+        but I'm just learning about rendering and starting from Phong seemed
+        the most natural way.
+        """
+
+        # If the mesh has vertex colors already, use them,
+        # otherwise turn them on and do some calculations
+        if mesh.vertexColors:
+            return
+        mesh.vertexColors = 1
+
+        materials = mesh.materials
+
+        camPos = self._getObjPosition(self.cameraObj)
+
+        # We do per-face color calculation (FLAT Shading), we can easily turn
+        # to a per-vertex calculation if we want to implement some shading
+        # technique. For an example see:
+        # http://www.miralab.unige.ch/papers/368.pdf
+        for f in mesh.faces:
+            if not f.sel:
+                continue
+
+            mat = None
+            if materials:
+                mat = materials[f.mat]
+
+            # A new default material
+            if mat == None:
+                mat = Material.New('defMat')
+
+            # Check if it is a shadeless material
+            elif mat.getMode() & Material.Modes['SHADELESS']:
+                I = mat.getRGBCol()
+                # Convert to a value between 0 and 255
+                tmp_col = [ int(c * 255.0) for c in I]
+
+                for c in f.col:
+                    c.r = tmp_col[0]
+                    c.g = tmp_col[1]
+                    c.b = tmp_col[2]
+                    #c.a = tmp_col[3]
+
+                continue
+
+
+            # do vertex color calculation
+
+            TotDiffSpec = Vector([0.0, 0.0, 0.0])
+
+            for l in self.lights:
+                light_obj = l
+                light_pos = self._getObjPosition(l)
+                light = light_obj.data
+            
+                L = Vector(light_pos).normalize()
+
+                V = (Vector(camPos) - Vector(f.cent)).normalize()
+
+                N = Vector(f.no).normalize()
+
+                if config.polygons['SHADING'] == 'TOON':
+                    NL = ShadingUtils.toonShading(N*L)
+                else:
+                    NL = (N*L)
+
+                # Should we use NL instead of (N*L) here?
+                R = 2 * (N*L) * N - L
+
+                Ip = light.getEnergy()
+
+                # Diffuse co-efficient
+                kd = mat.getRef() * Vector(mat.getRGBCol())
+                for i in [0, 1, 2]:
+                    kd[i] *= light.col[i]
+
+                Idiff = Ip * kd * max(0, NL)
+
+
+                # Specular component
+                ks = mat.getSpec() * Vector(mat.getSpecCol())
+                ns = mat.getHardness()
+                Ispec = Ip * ks * pow(max(0, (V*R)), ns)
+
+                TotDiffSpec += (Idiff+Ispec)
+
+
+            # Ambient component
+            Iamb = Vector(Blender.World.Get()[0].getAmb())
+            ka = mat.getAmb()
+
+            # Emissive component (convert to a triplet)
+            ki = Vector([mat.getEmit()]*3)
+
+            #I = ki + Iamb + (Idiff + Ispec)
+            I = ki + (ka * Iamb) + TotDiffSpec
+
+
+            # Set Alpha component
+            I = list(I)
+            I.append(mat.getAlpha())
+
+            # Clamp I values between 0 and 1
+            I = [ min(c, 1) for c in I]
+            I = [ max(0, c) for c in I]
+
+            # Convert to a value between 0 and 255
+            tmp_col = [ int(c * 255.0) for c in I]
+
+            for c in f.col:
+                c.r = tmp_col[0]
+                c.g = tmp_col[1]
+                c.b = tmp_col[2]
+                c.a = tmp_col[3]
+
+    def _doProjection(self, mesh, projector):
+        """Apply Viewing and Projection tranformations.
+        """
+
+        for v in mesh.verts:
+            p = projector.doProjection(v.co[:])
+            v.co[0] = p[0]
+            v.co[1] = p[1]
+            v.co[2] = p[2]
+
+        #mesh.recalcNormals()
+        #mesh.update()
+
+        # We could reeset Camera matrix, since now
+        # we are in Normalized Viewing Coordinates,
+        # but doung that would affect World Coordinate
+        # processing for other objects
+
+        #self.cameraObj.data.type = 1
+        #self.cameraObj.data.scale = 2.0
+        #m = Matrix().identity()
+        #self.cameraObj.setMatrix(m)
+
+    def _doViewFrustumClipping(self, mesh):
+        """Clip faces against the View Frustum.
+        """
+
+    # HSR routines
+    def __simpleDepthSort(self, mesh):
+        """Sort faces by the furthest vertex.
+
+        This simple mesthod is known also as the painter algorithm, and it
+        solves HSR correctly only for convex meshes.
+        """
+
+        global progress
+        # The sorting requires circa n*log(n) steps
+        n = len(mesh.faces)
+        progress.setActivity("HSR: Painter", n*log(n))
+        
+
+        by_furthest_z = (lambda f1, f2: progress.update() and
+                cmp(max([v.co[2] for v in f1]), max([v.co[2] for v in f2]))
+                )
+
+        # FIXME: using NMesh to sort faces. We should avoid that!
+        nmesh = NMesh.GetRaw(mesh.name)
+
+        # remember that _higher_ z values mean further points
+        nmesh.faces.sort(by_furthest_z)
+        nmesh.faces.reverse()
+
+        nmesh.update()
+
+    def __topologicalDepthSort(self, mesh):
+        """Occlusion based on topological occlusion.
+        
+        Build the occlusion graph of the mesh,
+        and then do topological sort on that graph
+        """
+        return
+
+    def __newellDepthSort(self, mesh):
+        """Newell's depth sorting.
+
+        """
+        by_furthest_z = (lambda f1, f2:
+                cmp(max([v.co[2] for v in f1]), max([v.co[2] for v in f2]))
+                )
+
+        mesh.quadToTriangle(0)
+
+        from split import Distance, isOnSegment
+
+        def projectionsOverlap(P, Q):
+
+            for i in range(0, len(P.v)):
+
+                v1 = Vector(P.v[i-1])
+                v1[2] = 0
+                v2 = Vector(P.v[i])
+                v2[2] = 0
+
+                EPS = 10e-7
+
+                for j in range(0, len(Q.v)):
+                    v3 = Vector(Q.v[j-1])
+                    v3[2] = 0
+                    v4 = Vector(Q.v[j])
+                    v4[2] = 0
+                    
+                    ret = LineIntersect(v1, v2, v3, v4)
+                    # if line v1-v2 and v3-v4 intersect both return
+                    # values are the same.
+                    if ret and ret[0] == ret[1]  and isOnSegment(v1, v2,
+                            ret[0], True) and isOnSegment(v3, v4, ret[1], True):
+
+
+                        l1 = (ret[0] - v1).length
+                        l2 = (ret[0] - v2).length
+
+                        l3 = (ret[1] - v3).length
+                        l4 = (ret[1] - v4).length
+
+                        if  (l1 < EPS or l2 < EPS) and (l3 < EPS or l4 < EPS):
+                            continue
+
+                        debug("Projections OVERLAP!!\n")
+                        debug("line1:"+
+                                " M "+ str(v1[0])+','+str(v1[1]) + ' L ' + str(v2[0])+','+str(v2[1]) + '\n' +
+                                " M "+ str(v3[0])+','+str(v3[1]) + ' L ' + str(v4[0])+','+str(v4[1]) + '\n' +
+                                "\n")
+                        debug("return: "+ str(ret)+"\n")
+                        return True
+
+            return False
+
+
+        from facesplit import facesplit
+
+        # FIXME: using NMesh to sort faces. We should avoid that!
+        nmesh = NMesh.GetRaw(mesh.name)
+
+        # remember that _higher_ z values mean further points
+        nmesh.faces.sort(by_furthest_z)
+        nmesh.faces.reverse()
+
+        
+        # Begin depth sort tests
+
+        # use the smooth flag to set marked faces
+        for f in nmesh.faces:
+            f.smooth = 0
+
+        facelist = nmesh.faces[:]
+        maplist = []
+
+        EPS = 10e-8
+        #EPS = 0
+
+        global progress
+        # The steps are _at_least_ equal to len(facelist), we do not count the
+        # feces coming out from plitting!!
+        progress.setActivity("HSR: Newell", len(facelist))
+        progress.setQuiet(True)
+
+        
+        steps = -1
+        split_done = 0
+        marked_face = 0
+
+        while len(facelist):
+            print "\n----------------------"
+            P = facelist[0]
+            
+            #steps += 1
+            #if steps == 3:
+            #    maplist = facelist
+            #    break
+            print len(facelist)
+            if len(facelist) == 33:
+                #maplist = facelist
+                break
+
+
+            #pSign = 1
+            #if P.normal[2] < 0:
+            #    pSign = -1
+            pSign = sign(P.normal[2])
+
+            # We can discard faces thar are perpendicular to the view
+            if pSign == 0:
+                facelist.remove(P)
+                continue
+
+
+            split_done = 0
+            face_marked = 0
+
+            for Q in facelist[1:]:
+
+                debug("P.smooth: " + str(P.smooth) + "\n")
+                debug("Q.smooth: " + str(Q.smooth) + "\n")
+                debug("\n")
+
+                #qSign = 1
+                #if Q.normal[2] < 0:
+                #    qSign = -1
+                qSign = sign(Q.normal[2])
+ 
+                # We need to test only those Qs whose furthest vertex
+                # is closer to the observer than the closest vertex of P.
+
+                zP = [v.co[2] for v in P.v]
+                zQ = [v.co[2] for v in Q.v]
+                ZOverlap = min(zP) < max(zQ)
+
+                if not ZOverlap:
+                    debug("\nTest 0\n")
+                    debug("NOT Z OVERLAP!\n")
+                    if Q.smooth == 0:
+                        # If Q is not marked then we can safely print P
+                        break
+                    else:
+                        debug("met a marked face\n")
+                        continue

                 
                 

-                #if (isVisible(face)):
-                #    print "face visible"
-
-                # backface culling
-                a = []
-                a.append(OBJmesh.faces[face][0][0])
-                a.append(OBJmesh.faces[face][0][1])
-                a.append(OBJmesh.faces[face][0][2])
-                a = RotatePoint(a[0], a[1], a[2], obj.RotX, obj.RotY, obj.RotZ)
-                a[0] += obj.LocX - camera.LocX
-                a[1] += obj.LocY - camera.LocY
-                a[2] += obj.LocZ - camera.LocZ
-                b = []
-                b.append(OBJmesh.faces[face][1][0])
-                b.append(OBJmesh.faces[face][1][1])
-                b.append(OBJmesh.faces[face][1][2])
-                b = RotatePoint(b[0], b[1], b[2], obj.RotX, obj.RotY, obj.RotZ)
-                b[0] += obj.LocX - camera.LocX
-                b[1] += obj.LocY - camera.LocY
-                b[2] += obj.LocZ - camera.LocZ
-                c = []
-                c.append(OBJmesh.faces[face][numvert-1][0])
-                c.append(OBJmesh.faces[face][numvert-1][1])
-                c.append(OBJmesh.faces[face][numvert-1][2])
-                c = RotatePoint(c[0], c[1], c[2], obj.RotX, obj.RotY, obj.RotZ)
-                c[0] += obj.LocX - camera.LocX
-                c[1] += obj.LocY - camera.LocY
-                c[2] += obj.LocZ - camera.LocZ
-
-                norm = [0,0,0]
-                norm[0] = (b[1] - a[1])*(c[2] - a[2]) - (c[1] - a[1])*(b[2] - a[2])
-                norm[1] = -((b[0] - a[0])*(c[2] - a[2]) - (c[0] - a[0])*(b[2] - a[2]))
-                norm[2] = (b[0] - a[0])*(c[1] - a[1]) - (c[0] - a[0])*(b[1] - a[1])
-
-                d = norm[0]*a[0] + norm[1]*a[1] + norm[2]*a[2]
-
-                # if the face is visible flatten it on the "picture plane"
-                if d < 0:
-                    file.write("<polygon points=\"")
-                    for vert in range(numvert):
-
-                        vertxyz = []
-
-                        if vert != 0: file.write(", ")
-
-                        vertxyz.append(OBJmesh.faces[face][vert][0])
-                        vertxyz.append(OBJmesh.faces[face][vert][1])
-                        vertxyz.append(OBJmesh.faces[face][vert][2])
-
-                        # rotate object
-                        vertxyz = RotatePoint(vertxyz[0], vertxyz[1], vertxyz[2], obj.RotX, obj.RotY, obj.RotZ)
-
-                        # original setting for translate
-                        vertxyz[0] += (obj.LocX - camera.LocX)
-                        vertxyz[1] += (obj.LocY - camera.LocY)
-                        vertxyz[2] += (obj.LocZ - camera.LocZ)
-
-                        # rotate camera
-                        vertxyz = RotatePoint(vertxyz[0], vertxyz[1], vertxyz[2], -camera.RotX, -camera.RotY, -camera.RotZ)
-
-                        #dist = Distance(vertxyz[0], vertxyz[1], vertxyz[2])
-                        xy = flatern(vertxyz[0], vertxyz[1], vertxyz[2])
-                        px = int(xy[0])
-                        py = int(xy[1])
-                        # add/sorting in Z' direction
-                        #Dodaj(px,py,Distance(vertxyz[0], vertxyz[1], vertxyz[2]))
-                        file.write(`px` + ", " + `py`)
-
-                    # per face color calculation
-                    ambient = -200
-                    #svetlo = [1, 1, -1] #original
-                    svetlo = [1, 1, -0.3]
-                    vektori = (norm[0]*svetlo[0]+norm[1]*svetlo[1]+norm[2]*svetlo[2])
-                    vduzine = fabs(sqrt(pow(norm[0],2)+pow(norm[1],2)+pow(norm[2],2))*sqrt(pow(svetlo[0],2)+pow(svetlo[1],2)+pow(svetlo[2],2)))
-                    intensity = floor(ambient + 255 * acos(vektori/vduzine))
-                    if intensity < 0:
-                        intensity = 0
+                # Test 1: X extent overlapping
+                xP = [v.co[0] for v in P.v]
+                xQ = [v.co[0] for v in Q.v]
+                notXOverlap = (max(xP) <= min(xQ)) or (max(xQ) <= min(xP))
+
+                if notXOverlap:
+                    debug("\nTest 1\n")
+                    debug("NOT X OVERLAP!\n")
+                    continue
+
+                # Test 2: Y extent Overlapping
+                yP = [v.co[1] for v in P.v]
+                yQ = [v.co[1] for v in Q.v]
+                notYOverlap = (max(yP) <= min(yQ)) or (max(yQ) <= min(yP))
+
+                if notYOverlap:
+                    debug("\nTest 2\n")
+                    debug("NOT Y OVERLAP!\n")
+                    continue
+                
+
+                # Test 3: P vertices are all behind the plane of Q
+                n = 0
+                for Pi in P:
+                    d = qSign * Distance(Vector(Pi), Q)
+                    if d >= -EPS:
+                        n += 1
+                pVerticesBehindPlaneQ = (n == len(P))
+
+                if pVerticesBehindPlaneQ:
+                    debug("\nTest 3\n")
+                    debug("P BEHIND Q!\n")
+                    continue
+
+
+                # Test 4: Q vertices in front of the plane of P
+                n = 0
+                for Qi in Q:
+                    d = pSign * Distance(Vector(Qi), P)
+                    if d <= EPS:
+                        n += 1
+                qVerticesInFrontPlaneP = (n == len(Q))
+
+                if qVerticesInFrontPlaneP:
+                    debug("\nTest 4\n")
+                    debug("Q IN FRONT OF P!\n")
+                    continue
+
+                # Test 5: Line Intersections... TODO
+                # Check if polygons effectively overlap each other, not only
+                # boundig boxes as done before.
+                # Since we We are working in normalized projection coordinates
+                # we kust check if polygons intersect.
+
+                if not projectionsOverlap(P, Q):
+                    debug("\nTest 5\n")
+                    debug("Projections do not overlap!\n")
+                    continue
+
+
+                # We still do not know if P obscures Q.
+
+                # But if Q is marked we do a split trying to resolve a
+                # difficulty (maybe a visibility cycle).
+                if Q.smooth == 1:
+                    # Split P or Q
+                    debug("Possibly a cycle detected!\n")
+                    debug("Split here!!\n")
+                    old_facelist = facelist[:]
+                    facelist = facesplit(P, Q, facelist, nmesh)
+                    split_done = 1
+                    break 
+
+
+                # The question now is: Does Q obscure P?
+
+                # Test 3bis: Q vertices are all behind the plane of P
+                n = 0
+                for Qi in Q:
+                    d = pSign * Distance(Vector(Qi), P)
+                    if d >= -EPS:
+                        n += 1
+                qVerticesBehindPlaneP = (n == len(Q))
+
+                if qVerticesBehindPlaneP:
+                    debug("\nTest 3bis\n")
+                    debug("Q BEHIND P!\n")
+
+
+                # Test 4bis: P vertices in front of the plane of Q
+                n = 0
+                for Pi in P:
+                    d = qSign * Distance(Vector(Pi), Q)
+                    if d <= EPS:
+                        n += 1
+                pVerticesInFrontPlaneQ = (n == len(P))
+
+                if pVerticesInFrontPlaneQ:
+                    debug("\nTest 4bis\n")
+                    debug("P IN FRONT OF Q!\n")
+
+                
+                # We don't even know if Q does obscure P, so they should
+                # intersect each other, split one of them in two parts.
+                if not qVerticesBehindPlaneP and not pVerticesInFrontPlaneQ:
+                    debug("\nSimple Intersection?\n")
+                    debug("Test 3bis or 4bis failed\n")
+                    debug("Split here!!2\n")
+
+                    old_facelist = facelist[:]
+                    facelist = facesplit(P, Q, facelist, nmesh)
+
+                    steps += 1
+                    if steps == 2:
+                        maplist = [P, Q]
+                        print P, Q
+                    split_done = 1
+                    break 
+

                     
                     

-                    wireframe = True
-                    if wireframe:
-                        stroke_width=1
-                    else: 
-                        stroke_width=0
-                    file.write("\"\n style=\"fill:rgb("+str(intensity)+","+str(intensity)+","+str(intensity)+");stroke:rgb(0,0,0);stroke-width:"+str(stroke_width)+"\"/>\n")
-    if animation:
-        file.write("<animate attributeName=\"visibility\" begin=\""+str(f*0.08)+"s\" dur=\"0.08s\" fill=\"remove\" to=\"visible\">\n")
-        file.write("</animate>\n")
-        file.write("</g>\n")
-
-file.write("</svg>")
-file.close()
-DrawProgressBar (1.0,"Finished.")
-print "Finished\n"
+                facelist.remove(Q)
+                facelist.insert(0, Q)
+                Q.smooth = 1
+                face_marked = 1
+
+                # Make merked faces BLUE. so to see them
+                #for c in Q.col:
+                #    c.r = 0
+                #    c.g = 0
+                #    c.b = 255
+                #    c.a = 255
+                
+                debug("Q marked!\n")
+                print [f.smooth for f in facelist]
+                break
+           
+            # Write P!                     
+            if split_done == 0 and face_marked == 0:
+                P = facelist[0]
+                facelist.remove(P)
+                maplist.append(P)
+
+                progress.update()
+                #if progress.progressModel.getProgress() == 100:
+                #    break
+            if steps == 2:
+                """
+                for c in Q.col:
+                    c.r = 0
+                    c.g = 0
+                    c.b = 255
+                    c.a = 255
+                for c in P.col:
+                    c.r = 0
+                    c.g = 0
+                    c.b = 255
+                    c.a = 255
+                """
+                print steps
+                #maplist.append(P)
+                #maplist.append(Q)
+
+               # for f in facelist:
+               #     if f not in old_facelist:
+               #         print "splitted?"
+               #         maplist.append(f)
+
+                break
+            """
+            """
+
+         
+
+        nmesh.faces = maplist
+
+        for f in nmesh.faces:
+            f.sel = 1
+        nmesh.update()
+        print nmesh.faces
+
+    def _doHiddenSurfaceRemoval(self, mesh):
+        """Do HSR for the given mesh.
+        """
+        if len(mesh.faces) == 0:
+            return
+
+        if config.polygons['HSR'] == 'PAINTER':
+            print "\nUsing the Painter algorithm for HSR."
+            self.__simpleDepthSort(mesh)
+
+        elif config.polygons['HSR'] == 'NEWELL':
+            print "\nUsing the Newell's algorithm for HSR."
+            self.__newellDepthSort(mesh)
+
+
+    def _doEdgesStyle(self, mesh, edgestyleSelect):
+        """Process Mesh Edges accroding to a given selection style.
+
+        Examples of algorithms:
+
+        Contours:
+            given an edge if its adjacent faces have the same normal (that is
+            they are complanar), than deselect it.
+
+        Silhouettes:
+            given an edge if one its adjacent faces is frontfacing and the
+            other is backfacing, than select it, else deselect.
+        """
+
+        Mesh.Mode(Mesh.SelectModes['EDGE'])
+
+        edge_cache = MeshUtils.buildEdgeFaceUsersCache(mesh)
+
+        for i,edge_faces in enumerate(edge_cache):
+            mesh.edges[i].sel = 0
+            if edgestyleSelect(edge_faces):
+                mesh.edges[i].sel = 1
+
+        """
+        for e in mesh.edges:
+
+            e.sel = 0
+            if edgestyleSelect(e, mesh):
+                e.sel = 1
+        """
+                
+
+
+# ---------------------------------------------------------------------
+#
+## GUI Class and Main Program
+#
+# ---------------------------------------------------------------------
+
+
+from Blender import BGL, Draw
+from Blender.BGL import *
+
+class GUI:
+    
+    def _init():
+
+        # Output Format menu 
+        output_format = config.output['FORMAT']
+        default_value = outputWriters.keys().index(output_format)+1
+        GUI.outFormatMenu = Draw.Create(default_value)
+        GUI.evtOutFormatMenu = 0
+
+        # Animation toggle button
+        GUI.animToggle = Draw.Create(config.output['ANIMATION'])
+        GUI.evtAnimToggle = 1
+
+        # Join Objects toggle button
+        GUI.joinObjsToggle = Draw.Create(config.output['JOIN_OBJECTS'])
+        GUI.evtJoinObjsToggle = 2
+
+        # Render filled polygons
+        GUI.polygonsToggle = Draw.Create(config.polygons['SHOW'])
+
+        # Shading Style menu 
+        shading_style = config.polygons['SHADING']
+        default_value = shadingStyles.keys().index(shading_style)+1
+        GUI.shadingStyleMenu = Draw.Create(default_value)
+        GUI.evtShadingStyleMenu = 21
+
+        GUI.evtPolygonsToggle = 3
+        # We hide the config.polygons['EXPANSION_TRICK'], for now
+
+        # Render polygon edges
+        GUI.showEdgesToggle = Draw.Create(config.edges['SHOW'])
+        GUI.evtShowEdgesToggle = 4
+
+        # Render hidden edges
+        GUI.showHiddenEdgesToggle = Draw.Create(config.edges['SHOW_HIDDEN'])
+        GUI.evtShowHiddenEdgesToggle = 5
+
+        # Edge Style menu 
+        edge_style = config.edges['STYLE']
+        default_value = edgeStyles.keys().index(edge_style)+1
+        GUI.edgeStyleMenu = Draw.Create(default_value)
+        GUI.evtEdgeStyleMenu = 6
+
+        # Edge Width slider
+        GUI.edgeWidthSlider = Draw.Create(config.edges['WIDTH'])
+        GUI.evtEdgeWidthSlider = 7
+
+        # Edge Color Picker
+        c = config.edges['COLOR']
+        GUI.edgeColorPicker = Draw.Create(c[0]/255.0, c[1]/255.0, c[2]/255.0)
+        GUI.evtEdgeColorPicker = 71
+
+        # Render Button
+        GUI.evtRenderButton = 8
+
+        # Exit Button
+        GUI.evtExitButton = 9
+
+    def draw():
+
+        # initialize static members
+        GUI._init()
+
+        glClear(GL_COLOR_BUFFER_BIT)
+        glColor3f(0.0, 0.0, 0.0)
+        glRasterPos2i(10, 350)
+        Draw.Text("VRM: Vector Rendering Method script. Version %s." %
+                __version__)
+        glRasterPos2i(10, 335)
+        Draw.Text("Press Q or ESC to quit.")
+
+        # Build the output format menu
+        glRasterPos2i(10, 310)
+        Draw.Text("Select the output Format:")
+        outMenuStruct = "Output Format %t"
+        for t in outputWriters.keys():
+           outMenuStruct = outMenuStruct + "|%s" % t
+        GUI.outFormatMenu = Draw.Menu(outMenuStruct, GUI.evtOutFormatMenu,
+                10, 285, 160, 18, GUI.outFormatMenu.val, "Choose the Output Format")
+
+        # Animation toggle
+        GUI.animToggle = Draw.Toggle("Animation", GUI.evtAnimToggle,
+                10, 260, 160, 18, GUI.animToggle.val,
+                "Toggle rendering of animations")
+
+        # Join Objects toggle
+        GUI.joinObjsToggle = Draw.Toggle("Join objects", GUI.evtJoinObjsToggle,
+                10, 235, 160, 18, GUI.joinObjsToggle.val,
+                "Join objects in the rendered file")
+
+        # Render Button
+        Draw.Button("Render", GUI.evtRenderButton, 10, 210-25, 75, 25+18,
+                "Start Rendering")
+        Draw.Button("Exit", GUI.evtExitButton, 95, 210-25, 75, 25+18, "Exit!")
+
+        # Rendering Styles
+        glRasterPos2i(200, 310)
+        Draw.Text("Rendering Style:")
+
+        # Render Polygons
+        GUI.polygonsToggle = Draw.Toggle("Filled Polygons", GUI.evtPolygonsToggle,
+                200, 285, 160, 18, GUI.polygonsToggle.val,
+                "Render filled polygons")
+
+        if GUI.polygonsToggle.val == 1:
+
+            # Polygon Shading Style
+            shadingStyleMenuStruct = "Shading Style %t"
+            for t in shadingStyles.keys():
+                shadingStyleMenuStruct = shadingStyleMenuStruct + "|%s" % t.lower()
+            GUI.shadingStyleMenu = Draw.Menu(shadingStyleMenuStruct, GUI.evtShadingStyleMenu,
+                    200, 260, 160, 18, GUI.shadingStyleMenu.val,
+                    "Choose the shading style")
+
+
+        # Render Edges
+        GUI.showEdgesToggle = Draw.Toggle("Show Edges", GUI.evtShowEdgesToggle,
+                200, 235, 160, 18, GUI.showEdgesToggle.val,
+                "Render polygon edges")
+
+        if GUI.showEdgesToggle.val == 1:
+            
+            # Edge Style
+            edgeStyleMenuStruct = "Edge Style %t"
+            for t in edgeStyles.keys():
+                edgeStyleMenuStruct = edgeStyleMenuStruct + "|%s" % t.lower()
+            GUI.edgeStyleMenu = Draw.Menu(edgeStyleMenuStruct, GUI.evtEdgeStyleMenu,
+                    200, 210, 160, 18, GUI.edgeStyleMenu.val,
+                    "Choose the edge style")
+
+            # Edge size
+            GUI.edgeWidthSlider = Draw.Slider("Width: ", GUI.evtEdgeWidthSlider,
+                    200, 185, 140, 18, GUI.edgeWidthSlider.val,
+                    0.0, 10.0, 0, "Change Edge Width")
+
+            # Edge Color
+            GUI.edgeColorPicker = Draw.ColorPicker(GUI.evtEdgeColorPicker,
+                    342, 185, 18, 18, GUI.edgeColorPicker.val, "Choose Edge Color")
+
+            # Show Hidden Edges
+            GUI.showHiddenEdgesToggle = Draw.Toggle("Show Hidden Edges",
+                    GUI.evtShowHiddenEdgesToggle,
+                    200, 160, 160, 18, GUI.showHiddenEdgesToggle.val,
+                    "Render hidden edges as dashed lines")
+
+        glRasterPos2i(10, 160)
+        Draw.Text("%s (c) 2006" % __author__)
+
+    def event(evt, val):
+
+        if evt == Draw.ESCKEY or evt == Draw.QKEY:
+            Draw.Exit()
+        else:
+            return
+
+        Draw.Redraw(1)
+
+    def button_event(evt):
+
+        if evt == GUI.evtExitButton:
+            Draw.Exit()
+
+        elif evt == GUI.evtOutFormatMenu:
+            i = GUI.outFormatMenu.val - 1
+            config.output['FORMAT']= outputWriters.keys()[i]
+
+        elif evt == GUI.evtAnimToggle:
+            config.output['ANIMATION'] = bool(GUI.animToggle.val)
+
+        elif evt == GUI.evtJoinObjsToggle:
+            config.output['JOIN_OBJECTS'] = bool(GUI.joinObjsToggle.val)
+
+        elif evt == GUI.evtPolygonsToggle:
+            config.polygons['SHOW'] = bool(GUI.polygonsToggle.val)
+
+        elif evt == GUI.evtShadingStyleMenu:
+            i = GUI.shadingStyleMenu.val - 1
+            config.polygons['SHADING'] = shadingStyles.keys()[i]
+
+        elif evt == GUI.evtShowEdgesToggle:
+            config.edges['SHOW'] = bool(GUI.showEdgesToggle.val)
+
+        elif evt == GUI.evtShowHiddenEdgesToggle:
+            config.edges['SHOW_HIDDEN'] = bool(GUI.showHiddenEdgesToggle.val)
+
+        elif evt == GUI.evtEdgeStyleMenu:
+            i = GUI.edgeStyleMenu.val - 1
+            config.edges['STYLE'] = edgeStyles.keys()[i]
+
+        elif evt == GUI.evtEdgeWidthSlider:
+            config.edges['WIDTH'] = float(GUI.edgeWidthSlider.val)
+
+        elif evt == GUI.evtEdgeColorPicker:
+            config.edges['COLOR'] = [int(c*255.0) for c in GUI.edgeColorPicker.val]
+
+        elif evt == GUI.evtRenderButton:
+            label = "Save %s" % config.output['FORMAT']
+            # Show the File Selector
+            global outputfile
+            Blender.Window.FileSelector(vectorize, label, outputfile)
+
+        else:
+            print "Event: %d not handled!" % evt
+
+        if evt:
+            Draw.Redraw(1)
+            #GUI.conf_debug()
+
+    def conf_debug():
+        from pprint import pprint
+        print "\nConfig"
+        pprint(config.output)
+        pprint(config.polygons)
+        pprint(config.edges)
+
+    _init = staticmethod(_init)
+    draw = staticmethod(draw)
+    event = staticmethod(event)
+    button_event = staticmethod(button_event)
+    conf_debug = staticmethod(conf_debug)
+
+# A wrapper function for the vectorizing process
+def vectorize(filename):
+    """The vectorizing process is as follows:
+     
+     - Instanciate the writer and the renderer
+     - Render!
+     """
+
+    if filename == "":
+        print "\nERROR: invalid file name!"
+        return
+
+    from Blender import Window
+    editmode = Window.EditMode()
+    if editmode: Window.EditMode(0)
+
+    actualWriter = outputWriters[config.output['FORMAT']]
+    writer = actualWriter(filename)
+    
+    renderer = Renderer()
+    renderer.doRendering(writer, config.output['ANIMATION'])
+
+    if editmode: Window.EditMode(1) 
+
+# We use a global progress Indicator Object
+progress = None
+
+# Here the main
+if __name__ == "__main__":
+
+    global progress
+
+    outputfile = ""
+    basename = Blender.sys.basename(Blender.Get('filename'))
+    if basename != "":
+        outputfile = Blender.sys.splitext(basename)[0] + "." + str(config.output['FORMAT']).lower()
+
+    if Blender.mode == 'background':
+        progress = ConsoleProgressIndicator()
+        vectorize(outputfile)
+    else:
+        progress = GraphicalProgressIndicator()
+        Draw.Register(GUI.draw, GUI.event, GUI.button_event)