ui.py

                #col.label(text="Parameters:")
                col.prop(obj.pov, "st_major_radius")
                col.prop(obj.pov, "st_minor_radius")
                col.prop(obj.pov, "st_u")
                col.prop(obj.pov, "st_v")
                col.prop(obj.pov, "st_ring")
                col.prop(obj.pov, "st_cross")
                col.prop(obj.pov, "st_ie")
                #col.prop(obj.pov, "st_edit") #?
                col.prop(obj.pov, "st_accuracy")
                col.prop(obj.pov, "st_max_gradient")

class OBJECT_PT_POV_obj_parametric(PovDataButtonsPanel, Panel):
    """Use this class to define pov parametric surface primitive parameters buttons."""

    bl_label = "POV Parametric surface"
    COMPAT_ENGINES = {'POVRAY_RENDER'}
    #bl_options = {'HIDE_HEADER'}
    @classmethod
    def poll(cls, context):
        engine = context.scene.render.engine
        obj = context.object
        return (obj and obj.pov.object_as == 'PARAMETRIC' and (engine in cls.COMPAT_ENGINES))
    def draw(self, context):
        layout = self.layout

        obj = context.object

        col = layout.column()

        if obj.pov.object_as == 'PARAMETRIC':
            if obj.pov.unlock_parameters == False:
                col.prop(obj.pov, "unlock_parameters", text="Exported parameters below", icon='LOCKED')
                col.label(text="Minimum U: " + str(obj.pov.u_min))
                col.label(text="Minimum V: " + str(obj.pov.v_min))
                col.label(text="Maximum U: " + str(obj.pov.u_max))
                col.label(text="Minimum V: " + str(obj.pov.v_min))
                col.label(text="X Function: " + str(obj.pov.x_eq))
                col.label(text="Y Function: " + str(obj.pov.y_eq))
                col.label(text="Z Function: " + str(obj.pov.x_eq))

            else:
                col.prop(obj.pov, "unlock_parameters", text="Edit exported parameters", icon='UNLOCKED')
                col.label(text="3D view proxy may get out of synch")
                col.active = obj.pov.unlock_parameters


                layout.operator("pov.parametric_update", text="Update",icon="SCRIPTPLUGINS")

                col.prop(obj.pov, "u_min", text="Minimum U")
                col.prop(obj.pov, "v_min", text="Minimum V")
                col.prop(obj.pov, "u_max", text="Maximum U")
                col.prop(obj.pov, "v_max", text="Minimum V")
                col.prop(obj.pov, "x_eq", text="X Function")
                col.prop(obj.pov, "y_eq", text="Y Function")
                col.prop(obj.pov, "z_eq", text="Z Function")


class OBJECT_PT_povray_replacement_text(ObjectButtonsPanel, Panel):
    """Use this class to define pov object replacement field."""

    bl_label = "Custom POV Code"
    COMPAT_ENGINES = {'POVRAY_RENDER'}

    def draw(self, context):
        layout = self.layout

        obj = context.object

        col = layout.column()
        col.label(text="Replace properties with:")
        col.prop(obj.pov, "replacement_text", text="")

###############################################################################
# Add Povray Objects
###############################################################################


class VIEW_MT_POV_primitives_add(bpy.types.Menu):
    """Define the primitives menu with presets"""
    bl_idname = "VIEW_MT_POV_primitives_add"
    bl_label = "Povray"
    COMPAT_ENGINES = {'POVRAY_RENDER'}

    @classmethod
    def poll(cls, context):
        engine = context.scene.render.engine
        return (engine == 'POVRAY_RENDER')

    def draw(self,context):
        layout = self.layout
        layout.operator_context = 'INVOKE_REGION_WIN'
        layout.menu(VIEW_MT_POV_Basic_Shapes.bl_idname, text = "Primitives",icon="GROUP")
        layout.menu(VIEW_MT_POV_import.bl_idname, text = "Import",icon="IMPORT")

class VIEW_MT_POV_Basic_Shapes(bpy.types.Menu):
    """Use this class to sort simple primitives menu entries."""

    bl_idname = "POVRAY_MT_basic_shape_tools"
    bl_label = "Basic_shapes"

    def draw(self,context):
        layout = self.layout
        layout.operator_context = 'INVOKE_REGION_WIN'
        layout.operator("pov.addplane", text="Infinite Plane",icon = 'MESH_PLANE')
        layout.operator("pov.addbox", text="Box",icon = 'MESH_CUBE')
        layout.operator("pov.addsphere", text="Sphere",icon = 'SHADING_RENDERED')
        layout.operator("pov.addcylinder", text="Cylinder",icon="MESH_CYLINDER")
        layout.operator("pov.cone_add", text="Cone",icon="MESH_CONE")
        layout.operator("pov.addtorus", text="Torus",icon = 'MESH_TORUS')
        layout.separator()
        layout.operator("pov.addrainbow", text="Rainbow",icon="COLOR")
        layout.operator("pov.addlathe", text="Lathe",icon = 'MOD_SCREW')
        layout.operator("pov.addprism", text="Prism",icon = 'MOD_SOLIDIFY')
        layout.operator("pov.addsuperellipsoid", text="Superquadric Ellipsoid",icon = 'MOD_SUBSURF')
        layout.operator("pov.addheightfield", text="Height Field",icon="RNDCURVE")
        layout.operator("pov.addspheresweep", text="Sphere Sweep",icon = 'FORCE_CURVE')
        layout.separator()
        layout.operator("pov.addblobsphere", text="Blob Sphere",icon = 'META_DATA')
        layout.separator()
        layout.label(text="Isosurfaces")
        layout.operator("pov.addisosurfacebox", text="Isosurface Box",icon="META_CUBE")
        layout.operator("pov.addisosurfacesphere", text="Isosurface Sphere",icon="META_BALL")
        layout.operator("pov.addsupertorus", text="Supertorus",icon="SURFACE_NTORUS")
        layout.separator()
        layout.label(text = "Macro based")
        layout.operator("pov.addpolygontocircle", text="Polygon To Circle Blending",icon="MOD_CAST")
        layout.operator("pov.addloft", text="Loft",icon="SURFACE_NSURFACE")
        layout.separator()
        # Warning if the Add Advanced Objects addon containing
        # Add mesh extra objects is not enabled
        if not check_add_mesh_extra_objects():
            #col = box.column()
            layout.label(text="Please enable Add Mesh: Extra Objects addon", icon="INFO")
            #layout.separator()
            layout.operator("preferences.addon_show",
                         text="Go to Add Mesh: Extra Objects addon",
                         icon="PREFERENCES").module = "add_mesh_extra_objects"

            #layout.separator()
            return
        else:
            layout.operator("pov.addparametric", text="Parametric",icon = 'SCRIPTPLUGINS')

class VIEW_MT_POV_import(bpy.types.Menu):
    """Use this class for the import menu."""

    bl_idname = "POVRAY_MT_import_tools"
    bl_label = "Import"

    def draw(self,context):
        layout = self.layout
        layout.operator_context = 'INVOKE_REGION_WIN'
        layout.operator("import_scene.pov",icon="FORCE_LENNARDJONES")

def menu_func_add(self, context):
    engine = context.scene.render.engine
    if engine == 'POVRAY_RENDER':
        self.layout.menu("VIEW_MT_POV_primitives_add", icon="PLUGIN")

def menu_func_import(self, context):
    engine = context.scene.render.engine
    if engine == 'POVRAY_RENDER':
        self.layout.operator("import_scene.pov",icon="FORCE_LENNARDJONES")


##############Nodes

# def find_node_input(node, name):
    # for input in node.inputs:
        # if input.name == name:
            # return input

# def panel_node_draw(layout, id_data, output_type, input_name):
    # if not id_data.use_nodes:
        # #layout.operator("pov.material_use_nodes", icon='SOUND')#'NODETREE')
        # #layout.operator("pov.use_shading_nodes", icon='NODETREE')
        # layout.operator("WM_OT_context_toggle", icon='NODETREE').data_path = \
                        # "material.pov.material_use_nodes"
        # return False

    # ntree = id_data.node_tree

    # node = find_node(id_data, output_type)
    # if not node:
        # layout.label(text="No output node")
    # else:
        # input = find_node_input(node, input_name)
        # layout.template_node_view(ntree, node, input)

    # return True

class NODE_MT_POV_map_create(bpy.types.Menu):
    """Create maps"""
    bl_idname = "POVRAY_MT_node_map_create"
    bl_label = "Create map"

    def draw(self,context):
        layout = self.layout
        layout.operator("node.map_create")

def menu_func_nodes(self, context):
    ob = context.object
    if hasattr(ob,'active_material'):
        mat=context.object.active_material
        if mat and context.space_data.tree_type == 'ObjectNodeTree':
            self.layout.prop(mat.pov,"material_use_nodes")
            self.layout.menu(NODE_MT_POV_map_create.bl_idname)
            self.layout.operator("wm.updatepreviewkey")
        if hasattr(mat,'active_texture') and context.scene.render.engine == 'POVRAY_RENDER':
            tex=mat.active_texture
            if tex and context.space_data.tree_type == 'TextureNodeTree':
                self.layout.prop(tex.pov,"texture_use_nodes")


###############################################################################
# Camera Povray Settings
###############################################################################
class CAMERA_PT_POV_cam_dof(CameraDataButtonsPanel, Panel):
    """Use this class for camera depth of field focal blur buttons."""

    bl_label = "POV Aperture"
    COMPAT_ENGINES = {'POVRAY_RENDER'}
    bl_parent_id = "DATA_PT_camera_dof_aperture"
    bl_options = {'HIDE_HEADER'}
    #def draw_header(self, context):
        #cam = context.camera

        #self.layout.prop(cam.pov, "dof_enable", text="")

    def draw(self, context):
        layout = self.layout

        cam = context.camera

        layout.active = cam.dof.use_dof
        layout.use_property_split = True # Active single-column layout

        flow = layout.grid_flow(row_major=True, columns=0, even_columns=True, even_rows=False, align=False)

        col = flow.column()
        col.label(text="F-Stop value will export as")
        col.label(text="POV aperture : " + "%.3f" % (1/cam.dof.aperture_fstop*1000))

        col = flow.column()
        col.prop(cam.pov, "dof_samples_min")
        col.prop(cam.pov, "dof_samples_max")
        col.prop(cam.pov, "dof_variance")
        col.prop(cam.pov, "dof_confidence")



class CAMERA_PT_POV_cam_nor(CameraDataButtonsPanel, Panel):
    """Use this class for camera normal perturbation buttons."""

    bl_label = "POV Perturbation"
    COMPAT_ENGINES = {'POVRAY_RENDER'}

    def draw_header(self, context):
        cam = context.camera

        self.layout.prop(cam.pov, "normal_enable", text="")

    def draw(self, context):
        layout = self.layout

        cam = context.camera

        layout.active = cam.pov.normal_enable

        layout.prop(cam.pov,"normal_patterns")
        layout.prop(cam.pov,"cam_normal")
        layout.prop(cam.pov,"turbulence")
        layout.prop(cam.pov,"scale")


class CAMERA_PT_POV_replacement_text(CameraDataButtonsPanel, Panel):
    """Use this class for camera text replacement field."""

    bl_label = "Custom POV Code"
    COMPAT_ENGINES = {'POVRAY_RENDER'}

    def draw(self, context):
        layout = self.layout

        cam = context.camera

        col = layout.column()
        col.label(text="Replace properties with:")
        col.prop(cam.pov, "replacement_text", text="")

###############################################################################
# Text Povray Settings
###############################################################################

class TEXT_OT_POV_insert(Operator):
    """Use this class to create blender text editor operator to insert pov snippets like other pov IDEs."""

    bl_idname = "text.povray_insert"
    bl_label = "Insert"

    filepath : bpy.props.StringProperty(name="Filepath", subtype='FILE_PATH')

    @classmethod
    def poll(cls, context):
        # context.area.type == 'TEXT_EDITOR'
        return bpy.ops.text.insert.poll()

    def execute(self, context):
        if self.filepath and isfile(self.filepath):
            file = open(self.filepath, "r")
            bpy.ops.text.insert(text=file.read())

            # places the cursor at the end without scrolling -.-
            # context.space_data.text.write(file.read())
            file.close()
        return {'FINISHED'}

def validinsert(ext):
	return ext in {".txt",".inc",".pov"}

class TEXT_MT_POV_insert(bpy.types.Menu):
    """Use this class to create a menu launcher in text editor for the TEXT_OT_POV_insert operator ."""

    bl_label = "Insert"
    bl_idname = "TEXT_MT_POV_insert"

    def draw(self, context):
        pov_documents = locate_docpath()
        prop = self.layout.operator("wm.path_open", text="Open folder", icon='FILE_FOLDER')
        prop.filepath = pov_documents
        self.layout.separator()

        list=[]
        for root,dirs,files in os.walk(pov_documents):
            list.append(root)
        print(list)
        self.path_menu(list,
                       "text.povray_insert",
                       #{"internal": True},
					   filter_ext= validinsert
                       )

class TEXT_PT_POV_custom_code(TextButtonsPanel, Panel):
    """Use this class to create a panel in text editor for the user to decide if he renders text only or adds to 3d scene."""

    bl_label = "POV"
    COMPAT_ENGINES = {'POVRAY_RENDER'}

    def draw(self, context):
        layout = self.layout

        text = context.space_data.text

        pov_documents = locate_docpath()
        if not pov_documents :
            layout.label(text="Please configure ", icon="INFO")
            layout.label(text="default pov include path ")
            layout.label(text="in addon preferences")
            #layout.separator()
            layout.operator("preferences.addon_show",
                         text="Go to Render: Persistence of Vision addon",
                         icon="PREFERENCES").module = "render_povray"

            #layout.separator()
        else:
            #print(pov_documents)
            layout.menu(TEXT_MT_POV_insert.bl_idname)

        if text:
            box = layout.box()
            box.label(text='Source to render:', icon='RENDER_STILL')
            row = box.row()
            row.prop(text.pov, "custom_code",expand = True)
            if text.pov.custom_code in {'3dview'}:
                box.operator("render.render", icon='OUTLINER_DATA_POSE')
            if text.pov.custom_code in {'text'}:
                rtext = bpy.context.space_data.text
                box.operator("text.run", icon='POSE_DATA')
            #layout.prop(text.pov, "custom_code")
            elif text.pov.custom_code in {'both'}:
                box.operator("render.render", icon='POSE_HLT')
                layout.label(text="Please specify declared", icon="INFO")
                layout.label(text="items in properties ")
                #layout.label(text="")
                layout.label(text="replacement fields")


###############################################
# Text editor templates from header menu

class TEXT_MT_POV_templates(bpy.types.Menu):
    """Use this class to create a menu for the same pov templates scenes as other pov IDEs."""

    bl_label = "POV"

    # We list templates on file evaluation, we can assume they are static data,
    # and better avoid running this on every draw call.
    import os
    template_paths = [os.path.join(os.path.dirname(__file__), "templates_pov")]

    def draw(self, context):
        self.path_menu(
            self.template_paths,
            "text.open",
            props_default={"internal": True},
        )

def menu_func_templates(self, context):
    # Do not depend on POV being active renderer here...
    self.layout.menu("TEXT_MT_POV_templates")

classes = (
    WORLD_PT_POV_world,
    WORLD_MT_POV_presets,
    WORLD_OT_POV_add_preset,
    WORLD_TEXTURE_SLOTS_UL_List,
    WORLD_PT_POV_mist,
    #RenderButtonsPanel,
    #ModifierButtonsPanel,
    #MaterialButtonsPanel,
    #TextureButtonsPanel,
    #ObjectButtonsPanel,
    #CameraDataButtonsPanel,
    #WorldButtonsPanel,
    #TextButtonsPanel,
    #PovDataButtonsPanel,
    DATA_PT_POV_normals,
    DATA_PT_POV_texture_space,
    DATA_PT_POV_vertex_groups,
    DATA_PT_POV_shape_keys,
    DATA_PT_POV_uv_texture,
    DATA_PT_POV_vertex_colors,
    DATA_PT_POV_customdata,
    #PovLampButtonsPanel,
    LIGHT_PT_POV_preview,
    LIGHT_PT_POV_light,
    LIGHT_MT_POV_presets,
    LIGHT_OT_POV_add_preset,
    OBJECT_PT_POV_rainbow,
    RENDER_PT_POV_export_settings,
    RENDER_PT_POV_render_settings,
    RENDER_PT_POV_photons,
    RENDER_PT_POV_antialias,
    RENDER_PT_POV_radiosity,
    POV_RADIOSITY_MT_presets,
    RENDER_OT_POV_radiosity_add_preset,
    RENDER_PT_POV_media,
    MODIFIERS_PT_POV_modifiers,
    MATERIAL_PT_POV_sss,
    MATERIAL_MT_POV_sss_presets,
    MATERIAL_OT_POV_sss_add_preset,
    MATERIAL_PT_strand,
    MATERIAL_PT_POV_activate_node,
    MATERIAL_PT_POV_active_node,
    MATERIAL_PT_POV_mirror,
    MATERIAL_PT_POV_transp,
    MATERIAL_PT_POV_reflection,
    #MATERIAL_PT_POV_interior,
    MATERIAL_PT_POV_fade_color,
    MATERIAL_PT_POV_caustics,
    MATERIAL_PT_POV_replacement_text,
    TEXTURE_MT_POV_specials,
    TEXTURE_PT_POV_context_texture,
    TEXTURE_PT_POV_type,
    TEXTURE_PT_POV_preview,
    TEXTURE_PT_POV_parameters,
    TEXTURE_PT_POV_tex_gamma,
    OBJECT_PT_POV_obj_parameters,
    OBJECT_PT_POV_obj_sphere,
    OBJECT_PT_POV_obj_cylinder,
    OBJECT_PT_POV_obj_cone,
    OBJECT_PT_POV_obj_superellipsoid,
    OBJECT_PT_POV_obj_torus,
    OBJECT_PT_POV_obj_supertorus,
    OBJECT_PT_POV_obj_parametric,
    OBJECT_PT_povray_replacement_text,
    VIEW_MT_POV_primitives_add,
    VIEW_MT_POV_Basic_Shapes,
    VIEW_MT_POV_import,
    NODE_MT_POV_map_create,
    CAMERA_PT_POV_cam_dof,
    CAMERA_PT_POV_cam_nor,
    CAMERA_PT_POV_replacement_text,
    TEXT_OT_POV_insert,
    TEXT_MT_POV_insert,
    TEXT_PT_POV_custom_code,
    TEXT_MT_POV_templates,
    # TEXTURE_PT_context,
    #TEXTURE_PT_POV_povray_texture_slots,
    TEXTURE_UL_POV_texture_slots,
    MATERIAL_TEXTURE_SLOTS_UL_POV_layerlist,
    MATERIAL_OT_POV_texture_slot_add,
    MATERIAL_OT_POV_texture_slot_remove,
    TEXTURE_PT_POV_influence
)


def register():
    #from bpy.utils import register_class

    for cls in classes:
        register_class(cls)

    bpy.types.VIEW3D_MT_add.prepend(menu_func_add)
    bpy.types.TOPBAR_MT_file_import.append(menu_func_import)
    bpy.types.TEXT_MT_templates.append(menu_func_templates)
    bpy.types.RENDER_PT_POV_radiosity.prepend(rad_panel_func)
    bpy.types.LIGHT_PT_POV_light.prepend(light_panel_func)
    #bpy.types.WORLD_PT_POV_world.prepend(world_panel_func)
    # was used for parametric objects but made the other addon unreachable on
    # unregister for other tools to use created a user action call instead
    #addon_utils.enable("add_mesh_extra_objects", default_set=False, persistent=True)

    #bpy.types.TEXTURE_PT_context_texture.prepend(TEXTURE_PT_POV_type)

def unregister():
    #from bpy.utils import unregister_class

    #bpy.types.TEXTURE_PT_context_texture.remove(TEXTURE_PT_POV_type)
    #addon_utils.disable("add_mesh_extra_objects", default_set=False)
    #bpy.types.WORLD_PT_POV_world.remove(world_panel_func)
    bpy.types.LIGHT_PT_POV_light.remove(light_panel_func)
    bpy.types.RENDER_PT_POV_radiosity.remove(rad_panel_func)
    bpy.types.TEXT_MT_templates.remove(menu_func_templates)
    bpy.types.TOPBAR_MT_file_import.remove(menu_func_import)
    bpy.types.VIEW3D_MT_add.remove(menu_func_add)

    for cls in reversed(classes):
        unregister_class(cls)