__init__.py

    loft_n = IntProperty(name = "Segments",
                    description = "Vertical segments",
                    default = 16, min = 3, max = 720)
    loft_rings_bottom = IntProperty(name = "Bottom",
                    description = "Bottom rings",
                    default = 5, min = 2, max = 100)
    loft_rings_side = IntProperty(name = "Side",
                    description = "Side rings",
                    default = 10, min = 2, max = 100)
    loft_thick = FloatProperty(name = "Thickness",
                      description = "Manipulates the shape of the Ring",
                      default = 0.3, min = 0.01, max = 1.0)
    loft_r = FloatProperty(name = "Radius",
                      description = "Radius",
                      default = 1, min = 0.01, max = 10)
    loft_height = FloatProperty(name = "Height",
                      description = "Manipulates the shape of the Ring",
                      default = 2, min = 0.01, max = 10.0)

###################Prism
    prism_n = IntProperty(name = "Sides",
                    description = "Number of sides",
                    default = 5, min = 3, max = 720)
    prism_r = FloatProperty(name = "Radius",
                    description = "Radius",
                    default = 1.0)

##################Isosurface
    iso_function_text = StringProperty(name="Function Text",maxlen=1024)#,update=iso_props_update_callback)

##################PolygonToCircle
    polytocircle_resolution = IntProperty(name = "Resolution",
                    description = "",
                    default = 3, min = 0, max = 256)
    polytocircle_ngon = IntProperty(name = "NGon",
                    description = "",
                    min = 3, max = 64,default = 5)
    polytocircle_ngonR = FloatProperty(name = "NGon Radius",
                    description = "",
                    default = 0.3)
    polytocircle_circleR = FloatProperty(name = "Circle Radius",
                    description = "",
                    default = 1.0)

#################Avogadro
    # filename_ext = ".png"

    # filter_glob = StringProperty(
            # default="*.exr;*.gif;*.hdr;*.iff;*.jpeg;*.jpg;*.pgm;*.png;*.pot;*.ppm;*.sys;*.tga;*.tiff;*.EXR;*.GIF;*.HDR;*.IFF;*.JPEG;*.JPG;*.PGM;*.PNG;*.POT;*.PPM;*.SYS;*.TGA;*.TIFF",
            # options={'HIDDEN'},
            # )

###############################################################################
# Camera POV properties.
###############################################################################
class RenderPovSettingsCamera(PropertyGroup):
    #DOF Toggle
    dof_enable = BoolProperty(
            name="Depth Of Field", description="EnablePOV-Ray Depth Of Field ",
            default=False)

    # Aperture (Intensity of the Blur)
    dof_aperture = FloatProperty(
            name="Aperture",
            description="Similar to a real camera's aperture effect over focal blur (though not "
                        "in physical units and independant of focal length). "
                        "Increase to get more blur",
            min=0.01, max=1.00, default=0.50)

    # Aperture adaptive sampling
    dof_samples_min = IntProperty(
            name="Samples Min", description="Minimum number of rays to use for each pixel",
            min=1, max=128, default=3)

    dof_samples_max = IntProperty(
            name="Samples Max", description="Maximum number of rays to use for each pixel",
            min=1, max=128, default=9)

    dof_variance = IntProperty(
            name="Variance",
            description="Minimum threshold (fractional value) for adaptive DOF sampling (up "
                        "increases quality and render time). The value for the variance should "
                        "be in the range of the smallest displayable color difference",
            min=1, max=100000, soft_max=10000, default=8192)

    dof_confidence = FloatProperty(
            name="Confidence",
            description="Probability to reach the real color value. Larger confidence values "
                        "will lead to more samples, slower traces and better images",
            min=0.01, max=0.99, default=0.20)

    normal_enable = BoolProperty(name="Perturbated Camera", default=False)
    cam_normal = FloatProperty(name="Normal Strenght", min=0.0, max=1.0, default=0.0)
    normal_patterns = EnumProperty(
            name="Pattern",
            description="",
            items=(('agate', "Agate", ""), ('boxed', "Boxed", ""), ('bumps', "Bumps", ""), ('cells', "Cells", ""),
                   ('crackle', "Crackle", ""),('dents', "Dents", ""),
                   ('granite', "Granite", ""),
                   ('leopard', "Leopard", ""),
                   ('marble', "Marble", ""), ('onion', "Onion", ""), ('pavement', "Pavement", ""), ('planar', "Planar", ""),
                   ('quilted', "Quilted", ""), ('ripples', "Ripples", ""),  ('radial', "Radial", ""),
                   ('spherical', "Spherical", ""),('spiral1', "Spiral1", ""), ('spiral2', "Spiral2", ""), ('spotted', "Spotted", ""),
                   ('square', "Square", ""),('tiling', "Tiling", ""),
                   ('waves', "Waves", ""), ('wood', "Wood", ""),('wrinkles', "Wrinkles", "")),
            default='agate')
    turbulence = FloatProperty(name="Turbulence", min=0.0, max=100.0, default=0.1)
    scale = FloatProperty(name="Scale", min=0.0,default=1.0)

    ##################################CustomPOV Code############################
    # Only DUMMIES below for now:
    replacement_text = StringProperty(
            name="Texts in blend file",
            description="Type the declared name in custom POV code or an external .inc "
                        "it points at. camera {} expected",
            default="")



###############################################################################
# Text POV properties.
###############################################################################
class RenderPovSettingsText(PropertyGroup):
    custom_code = BoolProperty(
            name="Custom Code",
            description="Add this text at the top of the exported POV-Ray file",
            default=False)


###############################################################################
# Povray Preferences.
###############################################################################
class PovrayPreferences(AddonPreferences):
    bl_idname = __name__

    branch_feature_set_povray = EnumProperty(
                name="Feature Set",
                description="Choose between official (POV-Ray) or (UberPOV) "
                            "development branch features to write in the pov file",
                items= (('povray', 'Official POV-Ray', '','PLUGIN', 0),
                        ('uberpov', 'Unofficial UberPOV', '', 'PLUGIN', 1)),
                default='povray'
                )

    filepath_povray = StringProperty(
                name="Binary Location",
                description="Path to renderer executable",
                subtype='FILE_PATH',
                )
    def draw(self, context):
        layout = self.layout
        layout.prop(self, "branch_feature_set_povray")
        layout.prop(self, "filepath_povray")












def register():
    bpy.utils.register_module(__name__)
    bpy.types.INFO_MT_add.prepend(ui.menu_func_add)
    bpy.types.INFO_MT_file_import.append(ui.menu_func_import)
    #used for parametric objects:
    addon_utils.enable("add_mesh_extra_objects", default_set=False, persistent=True)

    #bpy.types.TEXTURE_PT_context_texture.prepend(TEXTURE_PT_povray_type)

    bpy.types.NODE_HT_header.append(ui.menu_func_nodes)
    nodeitems_utils.register_node_categories("POVRAYNODES", node_categories)
    bpy.types.Scene.pov = PointerProperty(type=RenderPovSettingsScene)
    bpy.types.Material.pov = PointerProperty(type=RenderPovSettingsMaterial)
    bpy.types.Texture.pov = PointerProperty(type=RenderPovSettingsTexture)
    bpy.types.Object.pov = PointerProperty(type=RenderPovSettingsObject)
    bpy.types.Camera.pov = PointerProperty(type=RenderPovSettingsCamera)
    bpy.types.Text.pov = PointerProperty(type=RenderPovSettingsText)



def unregister():
    del bpy.types.Scene.pov
    del bpy.types.Material.pov
    del bpy.types.Texture.pov
    del bpy.types.Object.pov
    del bpy.types.Camera.pov
    del bpy.types.Text.pov
    nodeitems_utils.unregister_node_categories("POVRAYNODES")
    bpy.types.NODE_HT_header.remove(ui.menu_func_nodes)

    #bpy.types.TEXTURE_PT_context_texture.remove(TEXTURE_PT_povray_type)
    addon_utils.disable("add_mesh_extra_objects", default_set=False)
    bpy.types.INFO_MT_file_import.remove(ui.menu_func_import)
    bpy.types.INFO_MT_add.remove(ui.menu_func_add)
    bpy.utils.unregister_module(__name__)


if __name__ == "__main__":
    register()