io_export_unreal_psk_psa.py

    for i in scene.objects: i.select = False # deselect all objects
    scene.objects.active    = mesh
    setmesh = mesh
    mesh = triangulate_mesh(mesh)
    if bpy.types.Scene.udk_copy_merge == True:
        bpy.context.scene.objects.unlink(setmesh)
    #print("FACES----:",len(mesh.data.tessfaces))
    verbose("Working mesh object: {}".format(mesh.name))
    
    #collect a list of the material names
    print("Materials...")
    
    mat_slot_index = 0

    for slot in mesh.material_slots:

        print("  Material {} '{}'".format(mat_slot_index, slot.name))
        MaterialName.append(slot.name)
        #if slot.material.texture_slots[0] != None:
            #if slot.material.texture_slots[0].texture.image.filepath != None:
                #print("    Texture path {}".format(slot.material.texture_slots[0].texture.image.filepath)) 
        #create the current material
        v_material              = psk.GetMatByIndex(mat_slot_index)
        v_material.MaterialName = slot.name
        v_material.TextureIndex = mat_slot_index
        v_material.AuxMaterial  = mat_slot_index
        mat_slot_index += 1
        verbose("    PSK index {}".format(v_material.TextureIndex))

    #END slot in mesh.material_slots
    
    # object_mat = mesh.materials[0]
    #object_material_index = mesh.active_material_index
    #FIXME ^ this is redundant due to "= face.material_index" in face loop

    wedges          = ObjMap()
    points          = ObjMap()
    points_linked   = {}
    
    discarded_face_count = 0

    smoothgroup_list = parse_smooth_groups(mesh.data)
    
    print("{} faces".format(len(mesh.data.tessfaces)))
    
    print("Smooth groups active:", bpy.context.scene.udk_option_smoothing_groups)
    
    for face in mesh.data.tessfaces:
        
        smoothgroup_id = 0x80000000
        
        for smooth_group in smoothgroup_list:
            if smooth_group.contains_face(face):
                smoothgroup_id = smooth_group.id
                break

        #print ' -- Dumping UVs -- '
        #print current_face.uv_textures
        # modified by VendorX
        object_material_index = face.material_index
        
        if len(face.vertices) != 3:
            raise Error("Non-triangular face (%i)" % len(face.vertices))
        
        #RG - apparently blender sometimes has problems when you do quad to triangle 
        #   conversion, and ends up creating faces that have only TWO points -
        #   one of the points is simply in the vertex list for the face twice. 
        #   This is bad, since we can't get a real face normal for a LINE, we need 
        #   a plane for this. So, before we add the face to the list of real faces, 
        #   ensure that the face is actually a plane, and not a line. If it is not 
        #   planar, just discard it and notify the user in the console after we're
        #   done dumping the rest of the faces
        
        if not is_1d_face(face, mesh.data):
            
            wedge_list  = []
            vect_list   = []
            
            #get or create the current material
            psk.GetMatByIndex(object_material_index)

            face_index  = face.index
            has_uv      = False
            face_uv     = None
            
            if len(mesh.data.uv_textures) > 0:
                has_uv      = True   
                uv_layer    = mesh.data.tessface_uv_textures.active
                face_uv     = uv_layer.data[face_index]
                #size(data) is number of texture faces. Each face has UVs
                #print("DATA face uv: ",len(faceUV.uv), " >> ",(faceUV.uv[0][0]))
            
            for i in range(3):
                vert_index  = face.vertices[i]
                vert        = mesh.data.vertices[vert_index]
                uv          = []
                #assumes 3 UVs Per face (for now)
                if (has_uv):
                    if len(face_uv.uv) != 3:
                        print("WARNING: face has more or less than 3 UV coordinates - writing 0,0...")
                        uv = [0.0, 0.0]
                    else:
                        uv = [face_uv.uv[i][0],face_uv.uv[i][1]] #OR bottom works better # 24 for cube
                else:
                    #print ("No UVs?")
                    uv = [0.0, 0.0]
                
                #flip V coordinate because UEd requires it and DOESN'T flip it on its own like it
                #does with the mesh Y coordinates. this is otherwise known as MAGIC-2
                uv[1] = 1.0 - uv[1]
                
                # clamp UV coords if udk_option_clamp_uv is True
                if bpy.context.scene.udk_option_clamp_uv:
                    if (uv[0] > 1):
                        uv[0] = 1
                    if (uv[0] < 0):
                        uv[0] = 0
                    if (uv[1] > 1):
                        uv[1] = 1
                    if (uv[1] < 0):
                        uv[1] = 0
                
                # RE - Append untransformed vector (for normal calc below)
                # TODO: convert to Blender.Mathutils
                vect_list.append( FVector(vert.co.x, vert.co.y, vert.co.z) )
                
                # Transform position for export
                #vpos = vert.co * object_material_index

                #should fixed this!!
                
                
                vpos = mesh.matrix_local * vert.co
                if bpy.context.scene.udk_option_scale < 0 or bpy.context.scene.udk_option_scale > 1:
                    print("OK!")
                    vpos.x = vpos.x * bpy.context.scene.udk_option_scale
                    vpos.y = vpos.y * bpy.context.scene.udk_option_scale
                    vpos.z = vpos.z * bpy.context.scene.udk_option_scale
                #print("scale pos:", vpos)
                # Create the point
                p               = VPoint()
                p.Point.X       = vpos.x
                p.Point.Y       = vpos.y
                p.Point.Z       = vpos.z
                if bpy.context.scene.udk_option_smoothing_groups:#is this necessary?
                    p.SmoothGroup = smoothgroup_id

                lPoint          = VPointSimple()
                lPoint.Point.X  = vpos.x
                lPoint.Point.Y  = vpos.y
                lPoint.Point.Z  = vpos.z
                
                if lPoint in points_linked:
                    if not(p in points_linked[lPoint]):
                        points_linked[lPoint].append(p)
                else:
                    points_linked[lPoint] = [p]
                
                # Create the wedge
                w               = VVertex()
                w.MatIndex      = object_material_index
                w.PointIndex    = points.get(p) # store keys
                w.U             = uv[0]
                w.V             = uv[1]
                if bpy.context.scene.udk_option_smoothing_groups:#is this necessary?
                    w.SmoothGroup = smoothgroup_id
                index_wedge = wedges.get(w)
                wedge_list.append(index_wedge)
                
                #print results
                #print("result PointIndex={}, U={:.6f}, V={:.6f}, wedge_index={}".format(
                #   w.PointIndex,
                #   w.U,
                #   w.V,
                #   index_wedge))
            
            #END for i in range(3)

            # Determine face vertex order
            
            # TODO: convert to Blender.Mathutils
            # get normal from blender
            no = face.normal
            # convert to FVector
            norm = FVector(no[0], no[1], no[2])
            # Calculate the normal of the face in blender order
            tnorm = vect_list[1].sub(vect_list[0]).cross(vect_list[2].sub(vect_list[1]))
            # RE - dot the normal from blender order against the blender normal
            # this gives the product of the two vectors' lengths along the blender normal axis
            # all that matters is the sign
            dot = norm.dot(tnorm)

            tri = VTriangle()
            # RE - magic: if the dot product above > 0, order the vertices 2, 1, 0
            #      if the dot product above < 0, order the vertices 0, 1, 2
            #      if the dot product is 0, then blender's normal is coplanar with the face
            #      and we cannot deduce which side of the face is the outside of the mesh
            if dot > 0:
                (tri.WedgeIndex2, tri.WedgeIndex1, tri.WedgeIndex0) = wedge_list
            elif dot < 0:
                (tri.WedgeIndex0, tri.WedgeIndex1, tri.WedgeIndex2) = wedge_list
            else:
                dindex0 = face.vertices[0];
                dindex1 = face.vertices[1];
                dindex2 = face.vertices[2];

                mesh.data.vertices[dindex0].select = True
                mesh.data.vertices[dindex1].select = True
                mesh.data.vertices[dindex2].select = True
                
                raise Error("Normal coplanar with face! points:", mesh.data.vertices[dindex0].co, mesh.data.vertices[dindex1].co, mesh.data.vertices[dindex2].co)
            
            face.select = True
            #print("smooth:",(current_face.use_smooth))
            #not sure if this right
            #tri.SmoothingGroups
            if face.use_smooth == True:
                tri.SmoothingGroups = 1
            else:
                tri.SmoothingGroups = 0
            
            #tri.SmoothingGroups = 1
            tri.MatIndex = object_material_index

            if bpy.context.scene.udk_option_smoothing_groups:
                tri.SmoothingGroups = smoothgroup_id
            
            psk.AddFace(tri)

        #END if not is_1d_face(current_face, mesh.data) 

        else:
            discarded_face_count += 1
            
    #END face in mesh.data.faces
        
    print("{} points".format(len(points.dict)))
    
    for point in points.items():
        psk.AddPoint(point)
        
    if len(points.dict) > 32767:
       raise Error("Mesh vertex limit exceeded! {} > 32767".format(len(points.dict)))
    
    print("{} wedges".format(len(wedges.dict)))
    
    for wedge in wedges.items():
        psk.AddWedge(wedge)
    
    # alert the user to degenerate face issues
    if discarded_face_count > 0:
        print("WARNING: Mesh contained degenerate faces (non-planar)")
        print("      Discarded {} faces".format(discarded_face_count))
    
    #RG - walk through the vertex groups and find the indexes into the PSK points array 
    #for them, then store that index and the weight as a tuple in a new list of 
    #verts for the group that we can look up later by bone name, since Blender matches
    #verts to bones for influences by having the VertexGroup named the same thing as
    #the bone
    
    #[print(x, len(points_linked[x])) for x in points_linked] 
    #print("pointsindex length ",len(points_linked))
    #vertex group
    
    # all vertex groups of the mesh (obj)...
    for obj_vertex_group in mesh.vertex_groups:
        
        #print("  bone group build:",obj_vertex_group.name)#print bone name
        #print(dir(obj_vertex_group))
        verbose("obj_vertex_group.name={}".format(obj_vertex_group.name))
        
        vertex_list = []
        
        # all vertices in the mesh...
        for vertex in mesh.data.vertices:
            #print(dir(vertex))
            # all groups this vertex is a member of...
            for vgroup in vertex.groups:
                
                if vgroup.group == obj_vertex_group.index:
                    
                    vertex_weight   = vgroup.weight
                    p               = VPointSimple()
                    vpos            = mesh.matrix_local * vertex.co
                    if bpy.context.scene.udk_option_scale < 0 or bpy.context.scene.udk_option_scale > 1:
                        vpos.x = vpos.x * bpy.context.scene.udk_option_scale
                        vpos.y = vpos.y * bpy.context.scene.udk_option_scale
                        vpos.z = vpos.z * bpy.context.scene.udk_option_scale
                    p.Point.X       = vpos.x
                    p.Point.Y       = vpos.y 
                    p.Point.Z       = vpos.z
                        
                    for point in points_linked[p]:
                        point_index = points.get(point) #point index
                        v_item      = (point_index, vertex_weight)
                        vertex_list.append(v_item)
                    
        #bone name, [point id and wieght]
        #print("Add Vertex Group:",obj_vertex_group.name, " No. Points:",len(vertex_list))
        psk.VertexGroups[obj_vertex_group.name] = vertex_list
    
    # remove the temporary triangulated mesh
    if bpy.context.scene.udk_option_triangulate == True:
        verbose("Removing temporary triangle mesh: {}".format(mesh.name))
        bpy.ops.object.mode_set(mode='OBJECT')    # OBJECT mode
        mesh.parent = None                        # unparent to avoid phantom links
        bpy.context.scene.objects.unlink(mesh)    # unlink

#===========================================================================
# Collate bones that belong to the UDK skeletal mesh
#===========================================================================
def parse_armature( armature, psk, psa ):
        
    print(header("ARMATURE", 'RIGHT'))
    verbose("Armature object: {} Armature data: {}".format(armature.name, armature.data.name))
    
    # generate a list of root bone candidates
    root_candidates = [b for b in armature.data.bones if b.parent == None and b.use_deform == True]
    
    # should be a single, unambiguous result
    if len(root_candidates) == 0:
        raise Error("Cannot find root for UDK bones. The root bone must use deform.")
    
    if len(root_candidates) > 1:
        raise Error("Ambiguous root for UDK. More than one root bone is using deform.")
    
    # prep for bone collection
    udk_root_bone   = root_candidates[0]
    udk_bones       = []
    BoneUtil.static_bone_id = 0 # replaces global
    
    # traverse bone chain
    print("{: <3} {: <48} {: <20}".format("ID", "Bone", "Status"))
    print()
    recurse_bone(udk_root_bone, udk_bones, psk, psa, 0, armature.matrix_local)
    
    # final validation
    if len(udk_bones) < 3:
        raise Error("Less than three bones may crash UDK (legacy issue?)")
    
    # return a list of bones making up the entire udk skel
    # this is passed to parse_animation instead of working from keyed bones in the action
    return udk_bones

#===========================================================================
# bone              current bone
# bones             bone list
# psk               the PSK file object
# psa               the PSA file object
# parent_id
# parent_matrix
# indent            text indent for recursive log
#===========================================================================
def recurse_bone( bone, bones, psk, psa, parent_id, parent_matrix, indent="" ):
    
    status = "Ok"
    
    bones.append(bone);

    if not bone.use_deform:
        status = "No effect"
    
    # calc parented bone transform
    if bone.parent != None:
        quat        = make_fquat(bone.matrix.to_quaternion())
        quat_parent = bone.parent.matrix.to_quaternion().inverted()
        parent_head = quat_parent * bone.parent.head
        parent_tail = quat_parent * bone.parent.tail
        translation = (parent_tail - parent_head) + bone.head

    # calc root bone transform
    else:
        translation = parent_matrix * bone.head             # ARMATURE OBJECT Location
        rot_matrix  = bone.matrix * parent_matrix.to_3x3()  # ARMATURE OBJECT Rotation
        quat        = make_fquat_default(rot_matrix.to_quaternion())
    #udk_option_scale bones here?
    if bpy.context.scene.udk_option_scale < 0 or bpy.context.scene.udk_option_scale > 1:
        translation.x = translation.x * bpy.context.scene.udk_option_scale
        translation.y = translation.y * bpy.context.scene.udk_option_scale
        translation.z = translation.z * bpy.context.scene.udk_option_scale
    bone_id     = BoneUtil.static_bone_id   # ALT VERS
    BoneUtil.static_bone_id += 1            # ALT VERS
    
    child_count = len(bone.children)
    
    psk.AddBone( make_vbone(bone.name, parent_id, child_count, quat, translation) )
    psa.StoreBone( make_namedbonebinary(bone.name, parent_id, child_count, quat, translation, 1) )
    
    #RG - dump influences for this bone - use the data we collected in the mesh dump phase to map our bones to vertex groups
    if bone.name in psk.VertexGroups:
        
        vertex_list = psk.VertexGroups[bone.name]
        #print("vertex list:", len(vertex_list), " of >" ,bone.name )
        for vertex_data in vertex_list:
            
            point_index             = vertex_data[0]
            vertex_weight           = vertex_data[1]
            influence               = VRawBoneInfluence()
            influence.Weight        = vertex_weight
            influence.BoneIndex     = bone_id
            influence.PointIndex    = point_index
            #print ("   AddInfluence to vertex {}, weight={},".format(point_index, vertex_weight))
            psk.AddInfluence(influence)

    else:
        status = "No vertex group"
        #FIXME overwriting previous status error?
    
    print("{:<3} {:<48} {:<20}".format(bone_id, indent+bone.name, status))
    
    #bone.matrix_local
    #recursively dump child bones
    
    for child_bone in bone.children:
        recurse_bone(child_bone, bones, psk, psa, bone_id, parent_matrix, " "+indent)

# FIXME rename? remove?
class BoneUtil:
    static_bone_id = 0 # static property to replace global

#===========================================================================
# armature          the armature
# udk_bones         list of bones to be exported
# actions_to_export list of actions to process for export
# psa               the PSA file object
#===========================================================================
def parse_animation( armature, udk_bones, actions_to_export, psa ):
    
    print(header("ANIMATION", 'RIGHT'))
    
    context     = bpy.context
    anim_rate   = context.scene.render.fps
    
    verbose("Armature object: {}".format(armature.name))
    print("Scene: {} FPS: {} Frames: {} to {}".format(context.scene.name, anim_rate, context.scene.frame_start, context.scene.frame_end))
    print("Processing {} action(s)".format(len(actions_to_export)))
    print()
    if armature.animation_data == None: #this will make sure if animation data was create for the armature else it skip it.
        print("None Actions Set! skipping...")
        return
    restoreAction   = armature.animation_data.action    # Q: is animation_data always valid?
    
    restoreFrame    = context.scene.frame_current       # we already do this in export_proxy, but we'll do it here too for now
    raw_frame_index = 0  # used to set FirstRawFrame, seperating actions in the raw keyframe array
    
    # action loop...
    for action in actions_to_export:
        
        # removed: check for armature with no animation; all it did was force you to add one

        if not len(action.fcurves):
            print("{} has no keys, skipping".format(action.name))
            continue
        '''
        if bpy.context.scene.udk_option_selectanimations:
            print("Action Set is selected!")
            bready = False
            for actionlist in bpy.context.scene.udkas_list:
                if actionlist.name == action.name and actionlist.bmatch == True and actionlist.bexport == True:
                    bready = True
                    print("Added Action Set:",action.name)
                    break
            if bready == False:#don't export it
                print("Skipping Action Set:",action.name)
                continue
        '''
        # apply action to armature and update scene
        armature.animation_data.action = action
        context.scene.update()
        
        # min/max frames define range
        framemin, framemax  = action.frame_range
        start_frame         = int(framemin)
        end_frame           = int(framemax)
        scene_range         = range(start_frame, end_frame + 1)
        frame_count         = len(scene_range)
        
        # create the AnimInfoBinary
        anim                = AnimInfoBinary()
        anim.Name           = action.name
        anim.Group          = "" # unused?
        anim.NumRawFrames   = frame_count
        anim.AnimRate       = anim_rate
        anim.FirstRawFrame  = raw_frame_index
        
        print("{}, frames {} to {} ({} frames)".format(action.name, start_frame, end_frame, frame_count))
        
        # removed: bone lookup table
        
        # build a list of pose bones relevant to the collated udk_bones
        # fixme: could be done once, prior to loop?
        udk_pose_bones = []
        for b in udk_bones:
            for pb in armature.pose.bones:
                if b.name == pb.name:
                    udk_pose_bones.append(pb)
                    break;

        # sort in the order the bones appear in the PSA file
        ordered_bones = {}
        ordered_bones = sorted([(psa.UseBone(b.name), b) for b in udk_pose_bones], key=operator.itemgetter(0))
        
        # NOTE: posebone.bone references the obj/edit bone
        # REMOVED: unique_bone_indexes is redundant?
        
        # frame loop...
        for i in range(frame_count):
            
            frame = scene_range[i]
            
            #verbose("FRAME {}".format(i), i) # test loop sampling
            
            # advance to frame (automatically updates the pose)
            context.scene.frame_set(frame)
            
            # compute the key for each bone
            for bone_data in ordered_bones:
                
                bone_index          = bone_data[0]
                pose_bone           = bone_data[1]
                pose_bone_matrix    = mathutils.Matrix(pose_bone.matrix)
                
                if pose_bone.parent != None:
                    pose_bone_parent_matrix = mathutils.Matrix(pose_bone.parent.matrix)
                    pose_bone_matrix        = pose_bone_parent_matrix.inverted() * pose_bone_matrix
                
                head                = pose_bone_matrix.to_translation()
                quat                = pose_bone_matrix.to_quaternion().normalized()
                
                if pose_bone.parent != None:
                    quat = make_fquat(quat)
                else:
                    quat = make_fquat_default(quat)
                
                #scale animation position here?
                if bpy.context.scene.udk_option_scale < 0 or bpy.context.scene.udk_option_scale > 1:
                    head.x = head.x * bpy.context.scene.udk_option_scale
                    head.y = head.y * bpy.context.scene.udk_option_scale
                    head.z = head.z * bpy.context.scene.udk_option_scale

                vkey                = VQuatAnimKey()
                vkey.Position.X     = head.x
                vkey.Position.Y     = head.y
                vkey.Position.Z     = head.z
                vkey.Orientation    = quat
                
                # frame delta = 1.0 / fps
                vkey.Time           = 1.0 / float(anim_rate)    # according to C++ header this is "disregarded"
                
                psa.AddRawKey(vkey)
                
            # END for bone_data in ordered_bones

            raw_frame_index += 1
        
        # END for i in range(frame_count)
        
        anim.TotalBones = len(ordered_bones)    # REMOVED len(unique_bone_indexes)
        anim.TrackTime  = float(frame_count)    # frame_count/anim.AnimRate makes more sense, but this is what actually works in UDK

        verbose("anim.TotalBones={}, anim.TrackTime={}".format(anim.TotalBones, anim.TrackTime))
        
        psa.AddAnimation(anim)
        
    # END for action in actions

    # restore
    armature.animation_data.action = restoreAction
    context.scene.frame_set(restoreFrame)

#===========================================================================
# Collate actions to be exported
# Modify this to filter for one, some or all actions. For now use all.
# RETURNS list of actions
#===========================================================================
def collate_actions():
    verbose(header("collate_actions"))
    actions_to_export = []
    
    for action in bpy.data.actions:
        if bpy.context.scene.udk_option_selectanimations: # check if needed to select actions set for exporting it
            print("Action Set is selected!")
            bready = False
            for actionlist in bpy.context.scene.udkas_list: #list the action set from the list
                if actionlist.name == action.name and actionlist.bmatch == True and actionlist.bexport == True:
                    bready = True
                    print("Added Action Set:",action.name)
                    break
            if bready == False:#don't export it
                print("Skipping Action Set:",action.name)
                continue
        verbose(" + {}".format(action.name)) #action set name
        actions_to_export.append(action) #add to the action array
    
    return actions_to_export

#===========================================================================
# Locate the target armature and mesh for export
# RETURNS armature, mesh
#===========================================================================
def find_armature_and_mesh():
    verbose(header("find_armature_and_mesh", 'LEFT', '<', 60))
    
    context         = bpy.context
    active_object   = context.active_object
    armature        = None
    mesh            = None
    
    # TODO:
    # this could be more intuitive
    #bpy.ops.object.mode_set(mode='OBJECT')
    
    if bpy.context.scene.udk_option_selectobjects: #if checked select object true do list object on export
        print("select mode:")
        if len(bpy.context.scene.udkArm_list) > 0:
            print("Armature Name:",bpy.context.scene.udkArm_list[bpy.context.scene.udkArm_list_idx].name)
            for obj in bpy.context.scene.objects:
                if obj.name == bpy.context.scene.udkArm_list[bpy.context.scene.udkArm_list_idx].name:
                    armature = obj
                    break
        else:
            raise Error("There is no Armature in the list!")
        meshselected = []
        parented_meshes = [obj for obj in armature.children if obj.type == 'MESH']
        for obj in armature.children:
            #print(dir(obj))
            if obj.type == 'MESH' and obj.select == True:
                bexportmesh = False
                #print("PARENT MESH:",obj.name)
                for udkmeshlist in bpy.context.scene.udkmesh_list:
                    if obj.name == udkmeshlist.name and udkmeshlist.bexport == True:
                        bexportmesh = True
                        break
                if bexportmesh == True:
                    print("Mesh Name:",obj.name," < SELECT TO EXPORT!")
                    meshselected.append(obj)
        print("MESH COUNT:",len(meshselected))
        # try the active object
        if active_object and active_object.type == 'MESH' and len(meshselected) == 0:
            if active_object.parent == armature:
                mesh = active_object
            else:
                raise Error("The selected mesh is not parented to the armature")
    
        # otherwise, expect a single mesh parented to the armature (other object types are ignored)
        else:
            print("Number of meshes:",len(parented_meshes))
            print("Number of meshes (selected):",len(meshselected))
            if len(parented_meshes) == 1:
                mesh = parented_meshes[0]
                
            elif len(parented_meshes) > 1:
                if len(meshselected) >= 1:
                    mesh = sortmesh(meshselected)
                else:
                    raise Error("More than one mesh(s) parented to armature. Select object(s)!")
            else:
                raise Error("No mesh parented to armature")
    else: #if not check for select function from the list work the code here
        print("normal mode:")
        # try the active object
        if active_object and active_object.type == 'ARMATURE':
            armature = active_object
            bpy.ops.object.mode_set(mode='OBJECT')
        # otherwise, try for a single armature in the scene
        else:
            #bpy.ops.object.mode_set(mode='OBJECT')
            all_armatures = [obj for obj in bpy.context.scene.objects if obj.type == 'ARMATURE']
            
            if len(all_armatures) == 1:
                armature = all_armatures[0]
            elif len(all_armatures) > 1:
                raise Error("Please select an armature in the scene")
            else:
                raise Error("No armatures in scene")
        
        verbose("Found armature: {}".format(armature.name))
        
        meshselected = []
        parented_meshes = [obj for obj in armature.children if obj.type == 'MESH']
        for obj in armature.children:
            #print(dir(obj))
            if obj.type == 'MESH' and obj.select == True:
                meshselected.append(obj)
        # try the active object
        if active_object and active_object.type == 'MESH' and len(meshselected) == 0:
            if active_object.parent == armature:
                mesh = active_object
            else:
                raise Error("The selected mesh is not parented to the armature")
    
        # otherwise, expect a single mesh parented to the armature (other object types are ignored)
        else:
            print("Number of meshes:",len(parented_meshes))
            print("Number of meshes (selected):",len(meshselected))
            if len(parented_meshes) == 1:
                mesh = parented_meshes[0]
                
            elif len(parented_meshes) > 1:
                if len(meshselected) >= 1:
                    mesh = sortmesh(meshselected)
                else:
                    raise Error("More than one mesh(s) parented to armature. Select object(s)!")
            else:
                raise Error("No mesh parented to armature")
        
        verbose("Found mesh: {}".format(mesh.name))
    if mesh == None or armature == None:
        raise Error("Check Mesh and Armature are list!")
    if len(armature.pose.bones) == len(mesh.vertex_groups):
        print("Armature and Mesh Vertex Groups matches Ok!")
    else:
        raise Error("Armature bones:" + str(len(armature.pose.bones)) + " Mesh Vertex Groups:" + str(len(mesh.vertex_groups)) +" doesn't match!")
    
    #this will check if object need to be rebuild.
    if bpy.context.scene.udk_option_rebuildobjects:
        #print("INIT... REBUILDING...")
        print("REBUILDING ARMATURE...")
        #if deform mesh
        armature =  rebuildarmature(armature) #rebuild the armature to raw . If there IK constraint it will ignore it.
        print("REBUILDING MESH...")
        mesh = rebuildmesh(mesh) #rebuild the mesh to raw data format.

    return armature, mesh

#===========================================================================
# Returns a list of vertex groups in the mesh. Can be modified to filter
# groups as necessary.
# UNUSED
#===========================================================================
def collate_vertex_groups( mesh ):
    verbose("collate_vertex_groups")
    groups = []
    
    for group in mesh.vertex_groups:
        
        groups.append(group)
        verbose("  " + group.name)
    
    return groups
        
#===========================================================================
# Main
#===========================================================================
def export(filepath):
    print(header("Export", 'RIGHT'))
    bpy.types.Scene.udk_copy_merge = False #in case fail to export set this to default
    t       = time.clock()
    context = bpy.context
    
    print("Blender Version {}.{}.{}".format(bpy.app.version[0], bpy.app.version[1], bpy.app.version[2]))
    print("Filepath: {}".format(filepath))
    
    verbose("PSK={}, PSA={}".format(context.scene.udk_option_export_psk, context.scene.udk_option_export_psa))
    
    # find armature and mesh
    # [change this to implement alternative methods; raise Error() if not found]
    udk_armature, udk_mesh = find_armature_and_mesh()
    
    # check misc conditions
    if not (udk_armature.scale.x == udk_armature.scale.y == udk_armature.scale.z == 1):
        raise Error("bad armature scale: armature object should have uniform scale of 1 (ALT-S)")
    
    if not (udk_mesh.scale.x == udk_mesh.scale.y == udk_mesh.scale.z == 1):
        raise Error("bad mesh scale: mesh object should have uniform scale of 1 (ALT-S)")
    
    if not (udk_armature.location.x == udk_armature.location.y == udk_armature.location.z == 0):
        raise Error("bad armature location: armature should be located at origin (ALT-G)")
    
    if not (udk_mesh.location.x == udk_mesh.location.y == udk_mesh.location.z == 0):
        raise Error("bad mesh location: mesh should be located at origin (ALT-G)")
    
    # prep
    psk = PSKFile()
    psa = PSAFile()
    
    # step 1
    parse_mesh(udk_mesh, psk)
    
    # step 2
    udk_bones = parse_armature(udk_armature, psk, psa)
    
    # step 3
    if context.scene.udk_option_export_psa == True:
        actions = collate_actions()
        parse_animation(udk_armature, udk_bones, actions, psa)
    
    # write files
    print(header("Exporting", 'CENTER'))
    
    psk_filename = filepath + '.psk'
    psa_filename = filepath + '.psa'
    
    if context.scene.udk_option_export_psk == True:
        
        print("Skeletal mesh data...")
        psk.PrintOut()
        file = open(psk_filename, "wb") 
        file.write(psk.dump())
        file.close() 
        print("Exported: " + psk_filename)
        print()
    
    if context.scene.udk_option_export_psa == True:
        
        print("Animation data...")
        if not psa.IsEmpty():
            psa.PrintOut()
            file = open(psa_filename, "wb") 
            file.write(psa.dump())
            file.close() 
            print("Exported: " + psa_filename)
        
        else:
            print("No Animation (.psa file) to export")

        print()
    
    #if objects are rebuild do the unlink
    if bpy.context.scene.udk_option_rebuildobjects:
        print("Unlinking Objects")
        print("Armature Object Name:",udk_armature.name) #display object name
        bpy.context.scene.objects.unlink(udk_armature) #remove armature from the scene
        print("Mesh Object Name:",udk_mesh.name) #display object name
        bpy.context.scene.objects.unlink(udk_mesh) #remove mesh from the scene

    print("Export completed in {:.2f} seconds".format((time.clock() - t)))

#===========================================================================
# Operator
#===========================================================================
class Operator_UDKExport( bpy.types.Operator ):

    bl_idname   = "object.udk_export"
    bl_label    = "Export now"
    __doc__     = "Export to UDK"
    
    def execute(self, context):
        print( "\n"*8 )
        
        scene = bpy.context.scene
        
        scene.udk_option_export_psk = (scene.udk_option_export == '0' or scene.udk_option_export == '2')
        scene.udk_option_export_psa = (scene.udk_option_export == '1' or scene.udk_option_export == '2')
        
        filepath = get_dst_path()
        
        # cache settings
        restore_frame = scene.frame_current
        
        message = "Finish Export!"
        try:
            export(filepath)

        except Error as err:
            print(err.message)
            message = err.message
        
        # restore settings
        scene.frame_set(restore_frame)
        
        self.report({'ERROR'}, message)
        
        # restore settings
        scene.frame_set(restore_frame)
        
        return {'FINISHED'}

#===========================================================================
# Operator
#===========================================================================
class Operator_ToggleConsole( bpy.types.Operator ):

    bl_idname   = "object.toggle_console"
    bl_label    = "Toggle console"
    __doc__     = "Show or hide the console"
    
    #def invoke(self, context, event):
    #   bpy.ops.wm.console_toggle()
    #   return{'FINISHED'}
    def execute(self, context):
        bpy.ops.wm.console_toggle()
        return {'FINISHED'}

#===========================================================================
# Get filepath for export
#===========================================================================
def get_dst_path():
    if bpy.context.scene.udk_option_filename_src == '0':
        if bpy.context.active_object:
            path = os.path.split(bpy.data.filepath)[0] + "\\" + bpy.context.active_object.name# + ".psk"
        else:
            #path = os.path.split(bpy.data.filepath)[0] + "\\" + "Unknown";
            path = os.path.splitext(bpy.data.filepath)[0]# + ".psk"
    else:
        path = os.path.splitext(bpy.data.filepath)[0]# + ".psk"
    return path

#Added by [MGVS]
bpy.types.Scene.udk_option_filename_src = EnumProperty(
        name        = "Filename",
        description = "Sets the name for the files",
        items       = [ ('0', "From object",    "Name will be taken from object name"),
                        ('1', "From Blend",     "Name will be taken from .blend file name") ],
        default     = '0')
    
bpy.types.Scene.udk_option_export_psk = BoolProperty(
        name        = "bool export psa",
        description = "Boolean for exporting psk format (Skeleton Mesh)",
        default     = True)

bpy.types.Scene.udk_option_export_psa = BoolProperty(
        name        = "bool export psa",
        description = "Boolean for exporting psa format (Animation Data)",
        default     = True)

bpy.types.Scene.udk_option_clamp_uv = BoolProperty(
        name        = "Clamp UV",
        description = "True is to limit Clamp UV co-ordinates to [0-1]. False is unrestricted (x,y). ",
        default     = False)
        
bpy.types.Scene.udk_copy_merge = BoolProperty(
        name        = "Merge Mesh",
        description = "This will copy the mesh(s) and merge the object together and unlink the mesh to be remove while exporting the object.",
        default     = False)

bpy.types.Scene.udk_option_export = EnumProperty(
        name        = "Export",
        description = "What to export",
        items       = [ ('0', "Mesh only",          "Exports the PSK file for the Skeletal Mesh"),
                        ('1', "Animation only",     "Export the PSA file for Action Set(s)(Animations Data)"),
                        ('2', "Mesh & Animation",   "Export both PSK and PSA files(Skeletal Mesh/Animation(s) Data)") ],
        default     = '2')

bpy.types.Scene.udk_option_verbose = BoolProperty(
        name        = "Verbose",
        description = "Verbose console output",
        default     = False)

bpy.types.Scene.udk_option_smoothing_groups = BoolProperty(
        name        = "Smooth Groups",
        description = "Activate hard edges as smooth groups",
        default     = True)

bpy.types.Scene.udk_option_triangulate = BoolProperty(
        name        = "Triangulate Mesh",
        description = "Convert Quads to Triangles",
        default     = False)
        
bpy.types.Scene.udk_option_selectanimations = BoolProperty(
        name        = "Select Animation(s)",
        description = "Select animation(s) for export to psa file.",
        default     = False)
        
bpy.types.Scene.udk_option_selectobjects = BoolProperty(
        name        = "Select Object(s)",
        description = "Select Armature and Mesh(s). Just make sure mesh(s) is parent to armature.",
        default     = False)
        
bpy.types.Scene.udk_option_rebuildobjects = BoolProperty(
        name        = "Rebuild Objects",
        description = "In case of deform skeleton mesh and animations data. This will rebuild objects from raw format on export when checked.",
        default     = False)

bpy.types.Scene.udk_option_scale = FloatProperty(
    name = "UDK Scale",
    description = "In case you don't want to scale objects manually. This will just scale position when on export for the skeleton mesh and animation data.",
    default     = 1)

#===========================================================================
# User interface
#===========================================================================
class OBJECT_OT_UTSelectedFaceSmooth(bpy.types.Operator):
    bl_idname = "object.utselectfacesmooth"  # XXX, name???
    bl_label = "Select Smooth Faces"#"Select Smooth faces"
    __doc__ = """It will only select smooth faces that is select mesh"""
    
    def invoke(self, context, event):
        print("----------------------------------------")
        print("Init Select Face(s):")
        bselected = False
        for obj in bpy.data.objects:
            if obj.type == 'MESH' and obj.select == True:
                smoothcount = 0
                flatcount = 0
                bpy.ops.object.mode_set(mode='OBJECT')#it need to go into object mode to able to select the faces
                for i in bpy.context.scene.objects: i.select = False #deselect all objects
                obj.select = True #set current object select
                bpy.context.scene.objects.active = obj #set active object
                mesh = bmesh.new();
                mesh.from_mesh(obj.data)
                for face in mesh.faces:
                    face.select = False
                for face in mesh.faces:
                    if face.smooth == True:
                        face.select = True
                        smoothcount += 1
                    else:
                        flatcount += 1
                        face.select = False