export_fbx.py

        #ob_arms[i] = fbxArmObName, ob, arm_my_bones, (ob.action, [])

        for bone in my_arm.blenData.bones:
            my_bone = my_bone_class(bone, my_arm)
            my_arm.fbxBones.append(my_bone)
            ob_bones.append(my_bone)

    # add the meshes to the bones and replace the meshes armature with own armature class
    #for obname, ob, mtx, me, mats, arm, armname in ob_meshes:
    for my_mesh in ob_meshes:
        # Replace
        # ...this could be sped up with dictionary mapping but its unlikely for
        # it ever to be a bottleneck - (would need 100+ meshes using armatures)
        if my_mesh.fbxArm:
            for my_arm in ob_arms:
                if my_arm.blenObject == my_mesh.fbxArm:
                    my_mesh.fbxArm = my_arm
                    break

        for my_bone in ob_bones:

            # The mesh uses this bones armature!
            if my_bone.fbxArm == my_mesh.fbxArm:
                if my_bone.blenBone.use_deform:
                    my_bone.blenMeshes[my_mesh.fbxName] = me

                # parent bone: replace bone names with our class instances
                # my_mesh.fbxBoneParent is None or a blender bone name initialy, replacing if the names match.
                if my_mesh.fbxBoneParent == my_bone.blenName:
                    my_mesh.fbxBoneParent = my_bone

    bone_deformer_count = 0  # count how many bones deform a mesh
    my_bone_blenParent = None
    for my_bone in ob_bones:
        my_bone_blenParent = my_bone.blenBone.parent
        if my_bone_blenParent:
            for my_bone_parent in ob_bones:
                # Note 2.45rc2 you can compare bones normally
                if my_bone_blenParent.name == my_bone_parent.blenName and my_bone.fbxArm == my_bone_parent.fbxArm:
                    my_bone.parent = my_bone_parent
                    break

        # Not used at the moment
        # my_bone.calcRestMatrixLocal()
        bone_deformer_count += len(my_bone.blenMeshes)

    del my_bone_blenParent

    # Build blenObject -> fbxObject mapping
    # this is needed for groups as well as fbxParenting
    bpy.data.objects.tag(False)

    # using a list of object names for tagging (Arystan)

    tmp_obmapping = {}
    for ob_generic in ob_all_typegroups:
        for ob_base in ob_generic:
            ob_base.blenObject.tag = True
            tmp_obmapping[ob_base.blenObject] = ob_base

    # Build Groups from objects we export
    for blenGroup in bpy.data.groups:
        fbxGroupName = None
        for ob in blenGroup.objects:
            if ob.tag:
                if fbxGroupName is None:
                    fbxGroupName = sane_groupname(blenGroup)
                    groups.append((fbxGroupName, blenGroup))

                tmp_obmapping[ob].fbxGroupNames.append(fbxGroupName)  # also adds to the objects fbxGroupNames

    groups.sort()  # not really needed

    # Assign parents using this mapping
    for ob_generic in ob_all_typegroups:
        for my_ob in ob_generic:
            parent = my_ob.blenObject.parent
            if parent and parent.tag:  # does it exist and is it in the mapping
                my_ob.fbxParent = tmp_obmapping[parent]

    del tmp_obmapping
    # Finished finding groups we use
    
    # == WRITE OBJECTS TO THE FILE ==
    # == From now on we are building the FBX file from the information collected above (JCB)

    materials = [(sane_matname(mat_tex_pair), mat_tex_pair) for mat_tex_pair in materials.keys()]
    textures = [(sane_texname(tex), tex) for tex in textures.keys()  if tex]
    materials.sort(key=lambda m: m[0])  # sort by name
    textures.sort(key=lambda m: m[0])

    camera_count = 8 if 'CAMERA' in object_types else 0

    # sanity checks
    try:
        assert(not (ob_meshes and ('MESH' not in object_types)))
        assert(not (materials and ('MESH' not in object_types)))
        assert(not (textures and ('MESH' not in object_types)))
        assert(not (textures and ('MESH' not in object_types)))

        assert(not (ob_lights and ('LAMP' not in object_types)))

        assert(not (ob_cameras and ('CAMERA' not in object_types)))
    except AssertionError:
        import traceback
        traceback.print_exc()

    fw('''

; Object definitions
;------------------------------------------------------------------

Definitions:  {
	Version: 100
	Count: %i''' % (
        1 + camera_count +
        len(ob_meshes) +
        len(ob_lights) +
        len(ob_cameras) +
        len(ob_arms) +
        len(ob_null) +
        len(ob_bones) +
        bone_deformer_count +
        len(materials) +
        (len(textures) * 2)))  # add 1 for global settings

    del bone_deformer_count

    fw('''
	ObjectType: "Model" {
		Count: %i
	}''' % (
        camera_count +
        len(ob_meshes) +
        len(ob_lights) +
        len(ob_cameras) +
        len(ob_arms) +
        len(ob_null) +
        len(ob_bones)))

    fw('''
	ObjectType: "Geometry" {
		Count: %i
	}''' % len(ob_meshes))

    if materials:
        fw('''
	ObjectType: "Material" {
		Count: %i
	}''' % len(materials))

    if textures:
        fw('''
	ObjectType: "Texture" {
		Count: %i
	}''' % len(textures))  # add 1 for an empty tex
        fw('''
	ObjectType: "Video" {
		Count: %i
	}''' % len(textures))  # add 1 for an empty tex

    tmp = 0
    # Add deformer nodes
    for my_mesh in ob_meshes:
        if my_mesh.fbxArm:
            tmp += 1

    # Add subdeformers
    for my_bone in ob_bones:
        tmp += len(my_bone.blenMeshes)

    if tmp:
        fw('''
	ObjectType: "Deformer" {
		Count: %i
	}''' % tmp)
    del tmp

    # Bind pose is essential for XNA if the 'MESH' is included (JCB)
    fw('''
	ObjectType: "Pose" {
		Count: 1
	}''')

    if groups:
        fw('''
	ObjectType: "GroupSelection" {
		Count: %i
	}''' % len(groups))

    fw('''
	ObjectType: "GlobalSettings" {
		Count: 1
	}
}''')

    fw('''

; Object properties
;------------------------------------------------------------------

Objects:  {''')

    if 'CAMERA' in object_types:
        # To comply with other FBX FILES
        write_camera_switch()

    for my_null in ob_null:
        write_null(my_null)

    # XNA requires the armature to be a Limb (JCB)
    # Note, 2.58 and previous wrote these as normal empties and it worked mostly (except for XNA)
    for my_arm in ob_arms:
        write_null(my_arm, fbxType="Limb", fbxTypeFlags="Skeleton")

    for my_cam in ob_cameras:
        write_camera(my_cam)

    for my_light in ob_lights:
        write_light(my_light)

    for my_mesh in ob_meshes:
        write_mesh(my_mesh)

    #for bonename, bone, obname, me, armob in ob_bones:
    for my_bone in ob_bones:
        write_bone(my_bone)

    if 'CAMERA' in object_types:
        write_camera_default()

    for matname, (mat, tex) in materials:
        write_material(matname, mat)  # We only need to have a material per image pair, but no need to write any image info into the material (dumb fbx standard)

    # each texture uses a video, odd
    for texname, tex in textures:
        write_video(texname, tex)
    i = 0
    for texname, tex in textures:
        write_texture(texname, tex, i)
        i += 1

    for groupname, group in groups:
        write_group(groupname)

    # NOTE - c4d and motionbuilder dont need normalized weights, but deep-exploration 5 does and (max?) do.

    # Write armature modifiers
    # TODO - add another MODEL? - because of this skin definition.
    for my_mesh in ob_meshes:
        if my_mesh.fbxArm:
            write_deformer_skin(my_mesh.fbxName)

            # Get normalized weights for temorary use
            if my_mesh.fbxBoneParent:
                weights = None
            else:
                weights = meshNormalizedWeights(my_mesh.blenObject, my_mesh.blenData)

            #for bonename, bone, obname, bone_mesh, armob in ob_bones:
            for my_bone in ob_bones:
                if me in iter(my_bone.blenMeshes.values()):
                    write_sub_deformer_skin(my_mesh, my_bone, weights)

    # Write pose is really weird, only needed when an armature and mesh are used together
    # each by themselves do not need pose data. For now only pose meshes and bones

    # Bind pose is essential for XNA if the 'MESH' is included (JCB)
    fw('''
	Pose: "Pose::BIND_POSES", "BindPose" {
		Type: "BindPose"
		Version: 100
		Properties60:  {
		}
		NbPoseNodes: ''')
    fw(str(len(pose_items)))

    for fbxName, matrix in pose_items:
        fw('\n\t\tPoseNode:  {')
        fw('\n\t\t\tNode: "Model::%s"' % fbxName)
        fw('\n\t\t\tMatrix: %s' % mat4x4str(matrix if matrix else Matrix()))
        fw('\n\t\t}')

    fw('\n\t}')

    # Finish Writing Objects
    # Write global settings
    fw('''
	GlobalSettings:  {
		Version: 1000
		Properties60:  {
			Property: "UpAxis", "int", "",1
			Property: "UpAxisSign", "int", "",1
			Property: "FrontAxis", "int", "",2
			Property: "FrontAxisSign", "int", "",1
			Property: "CoordAxis", "int", "",0
			Property: "CoordAxisSign", "int", "",1
			Property: "UnitScaleFactor", "double", "",1
		}
	}
''')
    fw('}')

    fw('''

; Object relations
;------------------------------------------------------------------

Relations:  {''')

    # Nulls are likely to cause problems for XNA

    for my_null in ob_null:
        fw('\n\tModel: "Model::%s", "Null" {\n\t}' % my_null.fbxName)

    # Armature must be a Limb for XNA
    # Note, 2.58 and previous wrote these as normal empties and it worked mostly (except for XNA)
    for my_arm in ob_arms:
        fw('\n\tModel: "Model::%s", "Limb" {\n\t}' % my_arm.fbxName)

    for my_mesh in ob_meshes:
        fw('\n\tModel: "Model::%s", "Mesh" {\n\t}' % my_mesh.fbxName)

    # TODO - limbs can have the same name for multiple armatures, should prefix.
    #for bonename, bone, obname, me, armob in ob_bones:
    for my_bone in ob_bones:
        fw('\n\tModel: "Model::%s", "Limb" {\n\t}' % my_bone.fbxName)

    for my_cam in ob_cameras:
        fw('\n\tModel: "Model::%s", "Camera" {\n\t}' % my_cam.fbxName)

    for my_light in ob_lights:
        fw('\n\tModel: "Model::%s", "Light" {\n\t}' % my_light.fbxName)

    fw('''
	Model: "Model::Producer Perspective", "Camera" {
	}
	Model: "Model::Producer Top", "Camera" {
	}
	Model: "Model::Producer Bottom", "Camera" {
	}
	Model: "Model::Producer Front", "Camera" {
	}
	Model: "Model::Producer Back", "Camera" {
	}
	Model: "Model::Producer Right", "Camera" {
	}
	Model: "Model::Producer Left", "Camera" {
	}
	Model: "Model::Camera Switcher", "CameraSwitcher" {
	}''')

    for matname, (mat, tex) in materials:
        fw('\n\tMaterial: "Material::%s", "" {\n\t}' % matname)

    if textures:
        for texname, tex in textures:
            fw('\n\tTexture: "Texture::%s", "TextureVideoClip" {\n\t}' % texname)
        for texname, tex in textures:
            fw('\n\tVideo: "Video::%s", "Clip" {\n\t}' % texname)

    # deformers - modifiers
    for my_mesh in ob_meshes:
        if my_mesh.fbxArm:
            fw('\n\tDeformer: "Deformer::Skin %s", "Skin" {\n\t}' % my_mesh.fbxName)

    #for bonename, bone, obname, me, armob in ob_bones:
    for my_bone in ob_bones:
        for fbxMeshObName in my_bone.blenMeshes:  # .keys() - fbxMeshObName
            # is this bone effecting a mesh?
            fw('\n\tDeformer: "SubDeformer::Cluster %s %s", "Cluster" {\n\t}' % (fbxMeshObName, my_bone.fbxName))

    # This should be at the end
    # fw('\n\tPose: "Pose::BIND_POSES", "BindPose" {\n\t}')

    for groupname, group in groups:
        fw('\n\tGroupSelection: "GroupSelection::%s", "Default" {\n\t}' % groupname)

    fw('\n}')
    fw('''

; Object connections
;------------------------------------------------------------------

Connections:  {''')

    # NOTE - The FBX SDK does not care about the order but some importers DO!
    # for instance, defining the material->mesh connection
    # before the mesh->parent crashes cinema4d

    for ob_generic in ob_all_typegroups:  # all blender 'Object's we support
        for my_ob in ob_generic:
            # for deformed meshes, don't have any parents or they can get twice transformed.
            if my_ob.fbxParent and (not my_ob.fbxArm):
                fw('\n\tConnect: "OO", "Model::%s", "Model::%s"' % (my_ob.fbxName, my_ob.fbxParent.fbxName))
            else:
                fw('\n\tConnect: "OO", "Model::%s", "Model::Scene"' % my_ob.fbxName)

    if materials:
        for my_mesh in ob_meshes:
            # Connect all materials to all objects, not good form but ok for now.
            for mat, tex in my_mesh.blenMaterials:
                mat_name = mat.name if mat else None
                tex_name = tex.name if tex else None

                fw('\n\tConnect: "OO", "Material::%s", "Model::%s"' % (sane_name_mapping_mat[mat_name, tex_name], my_mesh.fbxName))

    if textures:
        for my_mesh in ob_meshes:
            if my_mesh.blenTextures:
                # fw('\n\tConnect: "OO", "Texture::_empty_", "Model::%s"' % my_mesh.fbxName)
                for tex in my_mesh.blenTextures:
                    if tex:
                        fw('\n\tConnect: "OO", "Texture::%s", "Model::%s"' % (sane_name_mapping_tex[tex.name], my_mesh.fbxName))

        for texname, tex in textures:
            fw('\n\tConnect: "OO", "Video::%s", "Texture::%s"' % (texname, texname))

    if 'MESH' in object_types:
        for my_mesh in ob_meshes:
            if my_mesh.fbxArm:
                fw('\n\tConnect: "OO", "Deformer::Skin %s", "Model::%s"' % (my_mesh.fbxName, my_mesh.fbxName))

        for my_bone in ob_bones:
            for fbxMeshObName in my_bone.blenMeshes:  # .keys()
                fw('\n\tConnect: "OO", "SubDeformer::Cluster %s %s", "Deformer::Skin %s"' % (fbxMeshObName, my_bone.fbxName, fbxMeshObName))

        # limbs -> deformers
        for my_bone in ob_bones:
            for fbxMeshObName in my_bone.blenMeshes:  # .keys()
                fw('\n\tConnect: "OO", "Model::%s", "SubDeformer::Cluster %s %s"' % (my_bone.fbxName, fbxMeshObName, my_bone.fbxName))

    #for bonename, bone, obname, me, armob in ob_bones:
    for my_bone in ob_bones:
        # Always parent to armature now
        if my_bone.parent:
            fw('\n\tConnect: "OO", "Model::%s", "Model::%s"' % (my_bone.fbxName, my_bone.parent.fbxName))
        else:
            # the armature object is written as an empty and all root level bones connect to it
            fw('\n\tConnect: "OO", "Model::%s", "Model::%s"' % (my_bone.fbxName, my_bone.fbxArm.fbxName))

    # groups
    if groups:
        for ob_generic in ob_all_typegroups:
            for ob_base in ob_generic:
                for fbxGroupName in ob_base.fbxGroupNames:
                    fw('\n\tConnect: "OO", "Model::%s", "GroupSelection::%s"' % (ob_base.fbxName, fbxGroupName))


    # I think the following always duplicates the armature connection because it is also in ob_all_typegroups above! (JCB)
    # for my_arm in ob_arms:
    #     fw('\n\tConnect: "OO", "Model::%s", "Model::Scene"' % my_arm.fbxName)

    fw('\n}')

    # Needed for scene footer as well as animation
    render = scene.render

    # from the FBX sdk
    #define KTIME_ONE_SECOND        KTime (K_LONGLONG(46186158000))
    def fbx_time(t):
        # 0.5 + val is the same as rounding.
        return int(0.5 + ((t / fps) * 46186158000))

    fps = float(render.fps)
    start = scene.frame_start
    end = scene.frame_end
    if end < start:
        start, end = end, start

    # comment the following line, otherwise we dont get the pose
    # if start==end: use_anim = False

    # animations for these object types
    ob_anim_lists = ob_bones, ob_meshes, ob_null, ob_cameras, ob_lights, ob_arms

    if use_anim and [tmp for tmp in ob_anim_lists if tmp]:

        frame_orig = scene.frame_current

        if use_anim_optimize:
            ANIM_OPTIMIZE_PRECISSION_FLOAT = 0.1 ** anim_optimize_precision

        # default action, when no actions are avaioable
        tmp_actions = []
        blenActionDefault = None
        action_lastcompat = None

        # instead of tagging
        tagged_actions = []

        # get the current action first so we can use it if we only export one action (JCB)
        for my_arm in ob_arms:
            if not blenActionDefault:
                blenActionDefault = my_arm.blenAction
                if blenActionDefault:
                    break

        if use_anim_action_all:
            tmp_actions = bpy.data.actions[:]
        elif not use_default_take:
            if blenActionDefault:
                # Export the current action (JCB)
                tmp_actions.append(blenActionDefault)

        if tmp_actions:
            # find which actions are compatible with the armatures
            tmp_act_count = 0
            for my_arm in ob_arms:

                arm_bone_names = set([my_bone.blenName for my_bone in my_arm.fbxBones])

                for action in tmp_actions:

                    action_chan_names = arm_bone_names.intersection(set([g.name for g in action.groups]))

                    if action_chan_names:  # at least one channel matches.
                        my_arm.blenActionList.append(action)
                        tagged_actions.append(action.name)
                        tmp_act_count += 1

                        # incase there are no actions applied to armatures
                        # for example, when a user deletes the current action.
                        action_lastcompat = action

            if tmp_act_count:
                # unlikely to ever happen but if no actions applied to armatures, just use the last compatible armature.
                if not blenActionDefault:
                    blenActionDefault = action_lastcompat

        del action_lastcompat

        if use_default_take:
            tmp_actions.insert(0, None)  # None is the default action

        fw('''
;Takes and animation section
;----------------------------------------------------

Takes:  {''')

        if blenActionDefault and not use_default_take:
            fw('\n\tCurrent: "%s"' % sane_takename(blenActionDefault))
        else:
            fw('\n\tCurrent: "Default Take"')

        for blenAction in tmp_actions:
            # we have tagged all actious that are used be selected armatures
            if blenAction:
                if blenAction.name in tagged_actions:
                    print('\taction: "%s" exporting...' % blenAction.name)
                else:
                    print('\taction: "%s" has no armature using it, skipping' % blenAction.name)
                    continue

            if blenAction is None:
                # Warning, this only accounts for tmp_actions being [None]
                take_name = "Default Take"
                act_start = start
                act_end = end
            else:
                # use existing name
                take_name = sane_name_mapping_take.get(blenAction.name)
                if take_name is None:
                    take_name = sane_takename(blenAction)

                act_start, act_end = blenAction.frame_range
                act_start = int(act_start)
                act_end = int(act_end)

                # Set the action active
                for my_arm in ob_arms:
                    if my_arm.blenObject.animation_data and blenAction in my_arm.blenActionList:
                        my_arm.blenObject.animation_data.action = blenAction

            # Use the action name as the take name and the take filename (JCB)
            fw('\n\tTake: "%s" {' % take_name)
            fw('\n\t\tFileName: "%s.tak"' % take_name.replace(" ", "_"))
            fw('\n\t\tLocalTime: %i,%i' % (fbx_time(act_start - 1), fbx_time(act_end - 1)))  # ??? - not sure why this is needed
            fw('\n\t\tReferenceTime: %i,%i' % (fbx_time(act_start - 1), fbx_time(act_end - 1)))  # ??? - not sure why this is needed

            fw('''

		;Models animation
		;----------------------------------------------------''')

            # set pose data for all bones
            # do this here incase the action changes
            '''
            for my_bone in ob_bones:
                my_bone.flushAnimData()
            '''
            i = act_start
            while i <= act_end:
                scene.frame_set(i)
                for ob_generic in ob_anim_lists:
                    for my_ob in ob_generic:
                        #Blender.Window.RedrawAll()
                        if ob_generic == ob_meshes and my_ob.fbxArm:
                            # We cant animate armature meshes!
                            my_ob.setPoseFrame(i, fake=True)
                        else:
                            my_ob.setPoseFrame(i)

                i += 1

            #for bonename, bone, obname, me, armob in ob_bones:
            for ob_generic in (ob_bones, ob_meshes, ob_null, ob_cameras, ob_lights, ob_arms):

                for my_ob in ob_generic:

                    if ob_generic == ob_meshes and my_ob.fbxArm:
                        # do nothing,
                        pass
                    else:

                        fw('\n\t\tModel: "Model::%s" {' % my_ob.fbxName)  # ??? - not sure why this is needed
                        fw('\n\t\t\tVersion: 1.1')
                        fw('\n\t\t\tChannel: "Transform" {')

                        context_bone_anim_mats = [(my_ob.getAnimParRelMatrix(frame), my_ob.getAnimParRelMatrixRot(frame)) for frame in range(act_start, act_end + 1)]

                        # ----------------
                        # ----------------
                        for TX_LAYER, TX_CHAN in enumerate('TRS'):  # transform, rotate, scale

                            if TX_CHAN == 'T':
                                context_bone_anim_vecs = [mtx[0].to_translation() for mtx in context_bone_anim_mats]
                            elif	TX_CHAN == 'S':
                                context_bone_anim_vecs = [mtx[0].to_scale() for mtx in context_bone_anim_mats]
                            elif	TX_CHAN == 'R':
                                # Was....
                                # elif 	TX_CHAN=='R':	context_bone_anim_vecs = [mtx[1].to_euler()			for mtx in context_bone_anim_mats]
                                #
                                # ...but we need to use the previous euler for compatible conversion.
                                context_bone_anim_vecs = []
                                prev_eul = None
                                for mtx in context_bone_anim_mats:
                                    if prev_eul:
                                        prev_eul = mtx[1].to_euler('XYZ', prev_eul)
                                    else:
                                        prev_eul = mtx[1].to_euler()
                                    context_bone_anim_vecs.append(tuple_rad_to_deg(prev_eul))

                            fw('\n\t\t\t\tChannel: "%s" {' % TX_CHAN)  # translation

                            for i in range(3):
                                # Loop on each axis of the bone
                                fw('\n\t\t\t\t\tChannel: "%s" {' % ('XYZ'[i]))  # translation
                                fw('\n\t\t\t\t\t\tDefault: %.15f' % context_bone_anim_vecs[0][i])
                                fw('\n\t\t\t\t\t\tKeyVer: 4005')

                                if not use_anim_optimize:
                                    # Just write all frames, simple but in-eficient
                                    fw('\n\t\t\t\t\t\tKeyCount: %i' % (1 + act_end - act_start))
                                    fw('\n\t\t\t\t\t\tKey: ')
                                    frame = act_start
                                    while frame <= act_end:
                                        if frame != act_start:
                                            fw(',')

                                        # Curve types are 'C,n' for constant, 'L' for linear
                                        # C,n is for bezier? - linear is best for now so we can do simple keyframe removal
                                        fw('\n\t\t\t\t\t\t\t%i,%.15f,L' % (fbx_time(frame - 1), context_bone_anim_vecs[frame - act_start][i]))
                                        frame += 1
                                else:
                                    # remove unneeded keys, j is the frame, needed when some frames are removed.
                                    context_bone_anim_keys = [(vec[i], j) for j, vec in enumerate(context_bone_anim_vecs)]

                                    # last frame to fisrt frame, missing 1 frame on either side.
                                    # removeing in a backwards loop is faster
                                    #for j in xrange( (act_end-act_start)-1, 0, -1 ):
                                    # j = (act_end-act_start)-1
                                    j = len(context_bone_anim_keys) - 2
                                    while j > 0 and len(context_bone_anim_keys) > 2:
                                        # print j, len(context_bone_anim_keys)
                                        # Is this key the same as the ones next to it?

                                        # co-linear horizontal...
                                        if		abs(context_bone_anim_keys[j][0] - context_bone_anim_keys[j - 1][0]) < ANIM_OPTIMIZE_PRECISSION_FLOAT and \
                                                abs(context_bone_anim_keys[j][0] - context_bone_anim_keys[j + 1][0]) < ANIM_OPTIMIZE_PRECISSION_FLOAT:

                                            del context_bone_anim_keys[j]

                                        else:
                                            frame_range = float(context_bone_anim_keys[j + 1][1] - context_bone_anim_keys[j - 1][1])
                                            frame_range_fac1 = (context_bone_anim_keys[j + 1][1] - context_bone_anim_keys[j][1]) / frame_range
                                            frame_range_fac2 = 1.0 - frame_range_fac1

                                            if abs(((context_bone_anim_keys[j - 1][0] * frame_range_fac1 + context_bone_anim_keys[j + 1][0] * frame_range_fac2)) - context_bone_anim_keys[j][0]) < ANIM_OPTIMIZE_PRECISSION_FLOAT:
                                                del context_bone_anim_keys[j]
                                            else:
                                                j -= 1

                                        # keep the index below the list length
                                        if j > len(context_bone_anim_keys) - 2:
                                            j = len(context_bone_anim_keys) - 2

                                    if len(context_bone_anim_keys) == 2 and context_bone_anim_keys[0][0] == context_bone_anim_keys[1][0]:

                                        # This axis has no moton, its okay to skip KeyCount and Keys in this case
                                        # pass

                                        # better write one, otherwise we loose poses with no animation
                                        fw('\n\t\t\t\t\t\tKeyCount: 1')
                                        fw('\n\t\t\t\t\t\tKey: ')
                                        fw('\n\t\t\t\t\t\t\t%i,%.15f,L' % (fbx_time(start), context_bone_anim_keys[0][0]))
                                    else:
                                        # We only need to write these if there is at least one
                                        fw('\n\t\t\t\t\t\tKeyCount: %i' % len(context_bone_anim_keys))
                                        fw('\n\t\t\t\t\t\tKey: ')
                                        for val, frame in context_bone_anim_keys:
                                            if frame != context_bone_anim_keys[0][1]:  # not the first
                                                fw(',')
                                            # frame is already one less then blenders frame
                                            fw('\n\t\t\t\t\t\t\t%i,%.15f,L' % (fbx_time(frame), val))

                                if i == 0:
                                    fw('\n\t\t\t\t\t\tColor: 1,0,0')
                                elif i == 1:
                                    fw('\n\t\t\t\t\t\tColor: 0,1,0')
                                elif i == 2:
                                    fw('\n\t\t\t\t\t\tColor: 0,0,1')

                                fw('\n\t\t\t\t\t}')
                            fw('\n\t\t\t\t\tLayerType: %i' % (TX_LAYER + 1))
                            fw('\n\t\t\t\t}')

                        # ---------------

                        fw('\n\t\t\t}')
                        fw('\n\t\t}')

            # end the take
            fw('\n\t}')

            # end action loop. set original actions
            # do this after every loop incase actions effect eachother.
            for my_arm in ob_arms:
                if my_arm.blenObject.animation_data:
                    my_arm.blenObject.animation_data.action = my_arm.blenAction

        fw('\n}')

        scene.frame_set(frame_orig)

    else:
        # no animation
        fw('\n;Takes and animation section')
        fw('\n;----------------------------------------------------')
        fw('\n')
        fw('\nTakes:  {')
        fw('\n\tCurrent: ""')
        fw('\n}')

    # write meshes animation
    #for obname, ob, mtx, me, mats, arm, armname in ob_meshes:

    # Clear mesh data Only when writing with modifiers applied
    for me in meshes_to_clear:
        bpy.data.meshes.remove(me)

    # --------------------------- Footer
    if world:
        m = world.mist_settings
        has_mist = m.use_mist
        mist_intense = m.intensity
        mist_start = m.start
        mist_end = m.depth
        # mist_height = m.height  # UNUSED
        world_hor = world.horizon_color
    else:
        has_mist = mist_intense = mist_start = mist_end = 0
        world_hor = 0, 0, 0

    fw('\n;Version 5 settings')
    fw('\n;------------------------------------------------------------------')
    fw('\n')
    fw('\nVersion5:  {')
    fw('\n\tAmbientRenderSettings:  {')
    fw('\n\t\tVersion: 101')
    fw('\n\t\tAmbientLightColor: %.1f,%.1f,%.1f,0' % tuple(world_amb))
    fw('\n\t}')
    fw('\n\tFogOptions:  {')
    fw('\n\t\tFlogEnable: %i' % has_mist)
    fw('\n\t\tFogMode: 0')
    fw('\n\t\tFogDensity: %.3f' % mist_intense)
    fw('\n\t\tFogStart: %.3f' % mist_start)
    fw('\n\t\tFogEnd: %.3f' % mist_end)
    fw('\n\t\tFogColor: %.1f,%.1f,%.1f,1' % tuple(world_hor))
    fw('\n\t}')
    fw('\n\tSettings:  {')
    fw('\n\t\tFrameRate: "%i"' % int(fps))
    fw('\n\t\tTimeFormat: 1')
    fw('\n\t\tSnapOnFrames: 0')
    fw('\n\t\tReferenceTimeIndex: -1')
    fw('\n\t\tTimeLineStartTime: %i' % fbx_time(start - 1))
    fw('\n\t\tTimeLineStopTime: %i' % fbx_time(end - 1))
    fw('\n\t}')
    fw('\n\tRendererSetting:  {')
    fw('\n\t\tDefaultCamera: "Producer Perspective"')
    fw('\n\t\tDefaultViewingMode: 0')
    fw('\n\t}')
    fw('\n}')
    fw('\n')

    # XXX, shouldnt be global!
    for mapping in (sane_name_mapping_ob,
                    sane_name_mapping_ob_unique,
                    sane_name_mapping_mat,
                    sane_name_mapping_tex,
                    sane_name_mapping_take,
                    sane_name_mapping_group,
                    ):
        mapping.clear()
    del mapping

    ob_arms[:] = []
    ob_bones[:] = []
    ob_cameras[:] = []
    ob_lights[:] = []
    ob_meshes[:] = []
    ob_null[:] = []

    file.close()

    # copy all collected files.
    bpy_extras.io_utils.path_reference_copy(copy_set)

    print('export finished in %.4f sec.' % (time.clock() - start_time))
    return {'FINISHED'}


# defaults for applications, currently only unity but could add others.
def defaults_unity3d():
    return dict(global_matrix=Matrix.Rotation(-math.pi / 2.0, 4, 'X'),
                use_selection=False,
                object_types={'ARMATURE', 'EMPTY', 'MESH'},
                use_mesh_modifiers=True,
                use_anim=True,
                use_anim_optimize=False,
                use_anim_action_all=True,
                batch_mode='OFF',
                use_default_take=True,
                )


def save(operator, context,
         filepath="",
         use_selection=False,
         batch_mode='OFF',
         use_batch_own_dir=False,
         **kwargs
         ):

    if bpy.ops.object.mode_set.poll():
        bpy.ops.object.mode_set(mode='OBJECT')

    if batch_mode == 'OFF':
        kwargs_mod = kwargs.copy()
        if use_selection:
            kwargs_mod["context_objects"] = context.selected_objects
        else:
            kwargs_mod["context_objects"] = context.scene.objects

        return save_single(operator, context.scene, filepath, **kwargs_mod)
    else:
        fbxpath = filepath

        prefix = os.path.basename(fbxpath)
        if prefix:
            fbxpath = os.path.dirname(fbxpath)

        if not fbxpath.endswith(os.sep):
            fbxpath += os.sep

        if batch_mode == 'GROUP':
            data_seq = bpy.data.groups
        else:
            data_seq = bpy.data.scenes

        # call this function within a loop with BATCH_ENABLE == False
        # no scene switching done at the moment.
        # orig_sce = context.scene

        new_fbxpath = fbxpath  # own dir option modifies, we need to keep an original
        for data in data_seq:  # scene or group
            newname = prefix + bpy.path.clean_name(data.name)

            if use_batch_own_dir:
                new_fbxpath = fbxpath + newname + os.sep
                # path may already exist
                # TODO - might exist but be a file. unlikely but should probably account for it.

                if not os.path.exists(new_fbxpath):
                    os.makedirs(new_fbxpath)

            filepath = new_fbxpath + newname + '.fbx'

            print('\nBatch exporting %s as...\n\t%r' % (data, filepath))

            # XXX don't know what to do with this, probably do the same? (Arystan)
            if batch_mode == 'GROUP':  # group
                # group, so objects update properly, add a dummy scene.
                scene = bpy.data.scenes.new(name="FBX_Temp")
                scene.layers = [True] * 20
                # bpy.data.scenes.active = scene # XXX, cant switch
                for ob_base in data.objects:
                    scene.objects.link(ob_base)

                scene.update()
            else:
                scene = data

                # TODO - BUMMER! Armatures not in the group wont animate the mesh

            # else:  # scene
            #     data_seq.active = data

            # Call self with modified args
            # Dont pass batch options since we already usedt them
            kwargs_batch = kwargs.copy()

            kwargs_batch["context_objects"] = data.objects

            save_single(operator, scene, filepath, **kwargs_batch)

            if batch_mode == 'GROUP':
                # remove temp group scene
                bpy.data.scenes.remove(scene)

        # no active scene changing!
        # bpy.data.scenes.active = orig_sce

        return {'FINISHED'}  # so the script wont run after we have batch exported.

# APPLICATION REQUIREMENTS
# Please update the lists for UDK, Unity, XNA etc. on the following web page:
#   http://wiki.blender.org/index.php/Dev:2.5/Py/Scripts/Import-Export/UnifiedFBX

# XNA FBX Requirements (JCB 29 July 2011)
# - Armature must be parented to the scene
# - Armature must be a 'Limb' never a 'null'.  This is in several places.
# - First bone must be parented to the armature.
# - Rotation must be completely disabled including
#       always returning the original matrix in In object_tx().
#       It is the animation that gets distorted during rotation!
# - Lone edges cause intermittent errors in the XNA content pipeline!
#       I have added a warning message and excluded them.
# - Bind pose must be included with the 'MESH'
# Typical settings for XNA export
#   No Cameras, No Lamps, No Edges, No face smoothing, No Default_Take, Armature as bone, Disable rotation

# NOTE TO Campbell - 
#   Can any or all of the following notes be removed because some have been here for a long time? (JCB 27 July 2011)
# NOTES (all line numbers correspond to original export_fbx.py (under release/scripts)
# - get rid of bpy.path.clean_name somehow
# + get rid of BPyObject_getObjectArmature, move it in RNA?
# - implement all BPyMesh_* used here with RNA
# - getDerivedObjects is not fully replicated with .dupli* funcs
# - don't know what those colbits are, do we need them? they're said to be deprecated in DNA_object_types.h: 1886-1893
# - no hq normals: 1900-1901