render.py

                for node in ntree.nodes:
                    if node:
                        if node.bl_idname == "PovrayOutputNode":
                            if node.inputs["Texture"].is_linked:
                                for link in ntree.links:
                                    if (
                                        link.to_node.bl_idname
                                        == "PovrayOutputNode"
                                    ):
                                        povMatName = (
                                            string_strip_hyphen(
                                                bpy.path.clean_name(
                                                    link.from_node.name
                                                )
                                            )
                                            + "_%s" % povMatName
                                        )
                            else:
                                file.write(
                                    '#declare %s = texture {%s}\n'
                                    % (povMatName, color)
                                )
            else:
                shading.writeMaterial(
                    using_uberpov,
                    DEF_MAT_NAME,
                    scene,
                    tabWrite,
                    safety,
                    comments,
                    uniqueName,
                    materialNames,
                    material,
                )
            # attributes are all the variables needed by the other python file...
    if comments:
        file.write("\n")

    exportMeta([m for m in sel if m.type == 'META'])

    if comments:
        file.write("//--Mesh objects--\n")

    exportMeshes(scene, sel, csg)

    # What follow used to happen here:
    # exportCamera()
    # exportWorld(scene.world)
    # exportGlobalSettings(scene)
    # MR:..and the order was important for implementing pov 3.7 baking
    #      (mesh camera) comment for the record
    # CR: Baking should be a special case than. If "baking", than we could change the order.

    # print("pov file closed %s" % file.closed)
    file.close()
    # print("pov file closed %s" % file.closed)


def write_pov_ini(
    scene, filename_ini, filename_log, filename_pov, filename_image
):
    """Write ini file."""
    feature_set = bpy.context.preferences.addons[
        __package__
    ].preferences.branch_feature_set_povray
    using_uberpov = feature_set == 'uberpov'
    # scene = bpy.data.scenes[0]
    scene = bpy.context.scene
    render = scene.render

    x = int(render.resolution_x * render.resolution_percentage * 0.01)
    y = int(render.resolution_y * render.resolution_percentage * 0.01)

    file = open(filename_ini, "w")
    file.write("Version=3.7\n")
    # write povray text stream to temporary file of same name with _log suffix
    # file.write("All_File='%s'\n" % filename_log)
    # DEBUG.OUT log if none specified:
    file.write("All_File=1\n")

    file.write("Input_File_Name='%s'\n" % filename_pov)
    file.write("Output_File_Name='%s'\n" % filename_image)

    file.write("Width=%d\n" % x)
    file.write("Height=%d\n" % y)

    # Border render.
    if render.use_border:
        file.write("Start_Column=%4g\n" % render.border_min_x)
        file.write("End_Column=%4g\n" % (render.border_max_x))

        file.write("Start_Row=%4g\n" % (1.0 - render.border_max_y))
        file.write("End_Row=%4g\n" % (1.0 - render.border_min_y))

    file.write(
        "Bounding_Method=2\n"
    )  # The new automatic BSP is faster in most scenes

    # Activated (turn this back off when better live exchange is done between the two programs
    # (see next comment)
    file.write("Display=1\n")
    file.write("Pause_When_Done=0\n")
    # PNG, with POV-Ray 3.7, can show background color with alpha. In the long run using the
    # POV-Ray interactive preview like bishop 3D could solve the preview for all formats.
    file.write("Output_File_Type=N\n")
    # file.write("Output_File_Type=T\n") # TGA, best progressive loading
    file.write("Output_Alpha=1\n")

    if scene.pov.antialias_enable:
        # method 2 (recursive) with higher max subdiv forced because no mipmapping in POV-Ray
        # needs higher sampling.
        # aa_mapping = {"5": 2, "8": 3, "11": 4, "16": 5}
        if using_uberpov:
            method = {"0": 1, "1": 2, "2": 3}
        else:
            method = {"0": 1, "1": 2, "2": 2}
        file.write("Antialias=on\n")
        file.write("Antialias_Depth=%d\n" % scene.pov.antialias_depth)
        file.write("Antialias_Threshold=%.3g\n" % scene.pov.antialias_threshold)
        if using_uberpov and scene.pov.antialias_method == '2':
            file.write(
                "Sampling_Method=%s\n" % method[scene.pov.antialias_method]
            )
            file.write(
                "Antialias_Confidence=%.3g\n" % scene.pov.antialias_confidence
            )
        else:
            file.write(
                "Sampling_Method=%s\n" % method[scene.pov.antialias_method]
            )
        file.write("Antialias_Gamma=%.3g\n" % scene.pov.antialias_gamma)
        if scene.pov.jitter_enable:
            file.write("Jitter=on\n")
            file.write("Jitter_Amount=%3g\n" % scene.pov.jitter_amount)
        else:
            file.write("Jitter=off\n")  # prevent animation flicker

    else:
        file.write("Antialias=off\n")
    # print("ini file closed %s" % file.closed)
    file.close()
    # print("ini file closed %s" % file.closed)


class PovrayRender(bpy.types.RenderEngine):
    """Define the external renderer"""

    bl_idname = 'POVRAY_RENDER'
    bl_label = "Persitence Of Vision"
    bl_use_shading_nodes_custom = False
    DELAY = 0.5

    @staticmethod
    def _locate_binary():
        """Identify POV engine"""
        addon_prefs = bpy.context.preferences.addons[__package__].preferences

        # Use the system preference if its set.
        pov_binary = addon_prefs.filepath_povray
        if pov_binary:
            if os.path.exists(pov_binary):
                return pov_binary
            else:
                print(
                    "User Preferences path to povray %r NOT FOUND, checking $PATH"
                    % pov_binary
                )

        # Windows Only
        # assume if there is a 64bit binary that the user has a 64bit capable OS
        if sys.platform[:3] == "win":
            import winreg

            win_reg_key = winreg.OpenKey(
                winreg.HKEY_CURRENT_USER, "Software\\POV-Ray\\v3.7\\Windows"
            )
            win_home = winreg.QueryValueEx(win_reg_key, "Home")[0]

            # First try 64bits UberPOV
            pov_binary = os.path.join(win_home, "bin", "uberpov64.exe")
            if os.path.exists(pov_binary):
                return pov_binary

            # Then try 64bits POV
            pov_binary = os.path.join(win_home, "bin", "pvengine64.exe")
            if os.path.exists(pov_binary):
                return pov_binary

            # Then try 32bits UberPOV
            pov_binary = os.path.join(win_home, "bin", "uberpov32.exe")
            if os.path.exists(pov_binary):
                return pov_binary

            # Then try 32bits POV
            pov_binary = os.path.join(win_home, "bin", "pvengine.exe")
            if os.path.exists(pov_binary):
                return pov_binary

        # search the path all os's
        pov_binary_default = "povray"

        os_path_ls = os.getenv("PATH").split(':') + [""]

        for dir_name in os_path_ls:
            pov_binary = os.path.join(dir_name, pov_binary_default)
            if os.path.exists(pov_binary):
                return pov_binary
        return ""

    def _export(self, depsgraph, povPath, renderImagePath):
        """gather all necessary output files paths user defined and auto generated and export there"""
        import tempfile

        scene = bpy.context.scene
        if scene.pov.tempfiles_enable:
            self._temp_file_in = tempfile.NamedTemporaryFile(
                suffix=".pov", delete=False
            ).name
            # PNG with POV 3.7, can show the background color with alpha. In the long run using the
            # POV-Ray interactive preview like bishop 3D could solve the preview for all formats.
            self._temp_file_out = tempfile.NamedTemporaryFile(
                suffix=".png", delete=False
            ).name
            # self._temp_file_out = tempfile.NamedTemporaryFile(suffix=".tga", delete=False).name
            self._temp_file_ini = tempfile.NamedTemporaryFile(
                suffix=".ini", delete=False
            ).name
            self._temp_file_log = os.path.join(
                tempfile.gettempdir(), "alltext.out"
            )
        else:
            self._temp_file_in = povPath + ".pov"
            # PNG with POV 3.7, can show the background color with alpha. In the long run using the
            # POV-Ray interactive preview like bishop 3D could solve the preview for all formats.
            self._temp_file_out = renderImagePath + ".png"
            # self._temp_file_out = renderImagePath + ".tga"
            self._temp_file_ini = povPath + ".ini"
            logPath = bpy.path.abspath(scene.pov.scene_path).replace('\\', '/')
            self._temp_file_log = os.path.join(logPath, "alltext.out")
            '''
            self._temp_file_in = "/test.pov"
            # PNG with POV 3.7, can show the background color with alpha. In the long run using the
            # POV-Ray interactive preview like bishop 3D could solve the preview for all formats.
            self._temp_file_out = "/test.png"
            #self._temp_file_out = "/test.tga"
            self._temp_file_ini = "/test.ini"
            '''
        if scene.pov.text_block == "":

            def info_callback(txt):
                self.update_stats("", "POV-Ray 3.7: " + txt)

            # os.makedirs(user_dir, exist_ok=True)  # handled with previews
            os.makedirs(preview_dir, exist_ok=True)

            write_pov(self._temp_file_in, scene, info_callback)
        else:
            pass

    def _render(self, depsgraph):
        """Export necessary files and render image."""
        scene = bpy.context.scene
        try:
            os.remove(self._temp_file_out)  # so as not to load the old file
        except OSError:
            pass

        pov_binary = PovrayRender._locate_binary()
        if not pov_binary:
            print(
                "POV-Ray 3.7: could not execute povray, possibly POV-Ray isn't installed"
            )
            return False

        write_pov_ini(
            scene,
            self._temp_file_ini,
            self._temp_file_log,
            self._temp_file_in,
            self._temp_file_out,
        )

        print("***-STARTING-***")

        extra_args = []

        if scene.pov.command_line_switches != "":
            for newArg in scene.pov.command_line_switches.split(" "):
                extra_args.append(newArg)

        self._is_windows = False
        if sys.platform[:3] == "win":
            self._is_windows = True
            if "/EXIT" not in extra_args and not scene.pov.pov_editor:
                extra_args.append("/EXIT")
        else:
            # added -d option to prevent render window popup which leads to segfault on linux
            extra_args.append("-d")

        # Start Rendering!
        try:
            self._process = subprocess.Popen(
                [pov_binary, self._temp_file_ini] + extra_args,
                stdout=subprocess.PIPE,
                stderr=subprocess.STDOUT,
            )
        except OSError:
            # TODO, report api
            print("POV-Ray 3.7: could not execute '%s'" % pov_binary)
            import traceback

            traceback.print_exc()
            print("***-DONE-***")
            return False

        else:
            print("Engine ready!...")
            print("Command line arguments passed: " + str(extra_args))
            return True

        # Now that we have a valid process

    def _cleanup(self):
        """Delete temp files and unpacked ones"""
        for f in (self._temp_file_in, self._temp_file_ini, self._temp_file_out):
            for i in range(5):
                try:
                    os.unlink(f)
                    break
                except OSError:
                    # Wait a bit before retrying file might be still in use by Blender,
                    # and Windows does not know how to delete a file in use!
                    time.sleep(self.DELAY)
        for i in unpacked_images:
            for c in range(5):
                try:
                    os.unlink(i)
                    break
                except OSError:
                    # Wait a bit before retrying file might be still in use by Blender,
                    # and Windows does not know how to delete a file in use!
                    time.sleep(self.DELAY)

    def render(self, depsgraph):
        """Export necessary files from text editor and render image."""
        import tempfile

        scene = bpy.context.scene
        r = scene.render
        x = int(r.resolution_x * r.resolution_percentage * 0.01)
        y = int(r.resolution_y * r.resolution_percentage * 0.01)
        print("***INITIALIZING***")

        # This makes some tests on the render, returning True if all goes good, and False if
        # it was finished one way or the other.
        # It also pauses the script (time.sleep())
        def _test_wait():
            time.sleep(self.DELAY)

            # User interrupts the rendering
            if self.test_break():
                try:
                    self._process.terminate()
                    print("***POV INTERRUPTED***")
                except OSError:
                    pass
                return False

            poll_result = self._process.poll()
            # POV process is finisehd, one way or the other
            if poll_result is not None:
                if poll_result < 0:
                    print("***POV PROCESS FAILED : %s ***" % poll_result)
                    self.update_stats("", "POV-Ray 3.7: Failed")
                return False

            return True

        if bpy.context.scene.pov.text_block != "":
            if scene.pov.tempfiles_enable:
                self._temp_file_in = tempfile.NamedTemporaryFile(
                    suffix=".pov", delete=False
                ).name
                self._temp_file_out = tempfile.NamedTemporaryFile(
                    suffix=".png", delete=False
                ).name
                # self._temp_file_out = tempfile.NamedTemporaryFile(suffix=".tga", delete=False).name
                self._temp_file_ini = tempfile.NamedTemporaryFile(
                    suffix=".ini", delete=False
                ).name
                self._temp_file_log = os.path.join(
                    tempfile.gettempdir(), "alltext.out"
                )
            else:
                povPath = scene.pov.text_block
                renderImagePath = os.path.splitext(povPath)[0]
                self._temp_file_out = os.path.join(preview_dir, renderImagePath)
                self._temp_file_in = os.path.join(preview_dir, povPath)
                self._temp_file_ini = os.path.join(
                    preview_dir,
                    (os.path.splitext(self._temp_file_in)[0] + ".INI"),
                )
                self._temp_file_log = os.path.join(preview_dir, "alltext.out")

            '''
            try:
                os.remove(self._temp_file_in)  # so as not to load the old file
            except OSError:
                pass
            '''
            print(scene.pov.text_block)
            text = bpy.data.texts[scene.pov.text_block]
            file = open("%s" % self._temp_file_in, "w")
            # Why are the newlines needed?
            file.write("\n")
            file.write(text.as_string())
            file.write("\n")
            file.close()

            # has to be called to update the frame on exporting animations
            scene.frame_set(scene.frame_current)

            pov_binary = PovrayRender._locate_binary()

            if not pov_binary:
                print(
                    "POV-Ray 3.7: could not execute povray, possibly POV-Ray isn't installed"
                )
                return False

            # start ini UI options export
            self.update_stats(
                "", "POV-Ray 3.7: Exporting ini options from Blender"
            )

            write_pov_ini(
                scene,
                self._temp_file_ini,
                self._temp_file_log,
                self._temp_file_in,
                self._temp_file_out,
            )

            print("***-STARTING-***")

            extra_args = []

            if scene.pov.command_line_switches != "":
                for newArg in scene.pov.command_line_switches.split(" "):
                    extra_args.append(newArg)

            if sys.platform[:3] == "win":
                if "/EXIT" not in extra_args and not scene.pov.pov_editor:
                    extra_args.append("/EXIT")
            else:
                # added -d option to prevent render window popup which leads to segfault on linux
                extra_args.append("-d")

            # Start Rendering!
            try:
                if (
                    sys.platform[:3] != "win" and scene.pov.sdl_window_enable
                ):  # segfault on linux == False !!!
                    env = {'POV_DISPLAY_SCALED': 'off'}
                    env.update(os.environ)
                    self._process = subprocess.Popen(
                        [pov_binary, self._temp_file_ini],
                        stdout=subprocess.PIPE,
                        stderr=subprocess.STDOUT,
                        env=env,
                    )
                else:
                    self._process = subprocess.Popen(
                        [pov_binary, self._temp_file_ini] + extra_args,
                        stdout=subprocess.PIPE,
                        stderr=subprocess.STDOUT,
                    )
            except OSError:
                # TODO, report api
                print("POV-Ray 3.7: could not execute '%s'" % pov_binary)
                import traceback

                traceback.print_exc()
                print("***-DONE-***")
                return False

            else:
                print("Engine ready!...")
                print("Command line arguments passed: " + str(extra_args))
                # return True
                self.update_stats("", "POV-Ray 3.7: Parsing File")

            # Indented in main function now so repeated here but still not working
            # to bring back render result to its buffer

            if os.path.exists(self._temp_file_out):
                xmin = int(r.border_min_x * x)
                ymin = int(r.border_min_y * y)
                xmax = int(r.border_max_x * x)
                ymax = int(r.border_max_y * y)
                result = self.begin_result(0, 0, x, y)
                lay = result.layers[0]

                time.sleep(self.DELAY)
                try:
                    lay.load_from_file(self._temp_file_out)
                except RuntimeError:
                    print("***POV ERROR WHILE READING OUTPUT FILE***")
                self.end_result(result)
            # print(self._temp_file_log) #bring the pov log to blender console with proper path?
            with open(
                self._temp_file_log
            ) as f:  # The with keyword automatically closes the file when you are done
                print(f.read())

            self.update_stats("", "")

            if scene.pov.tempfiles_enable or scene.pov.deletefiles_enable:
                self._cleanup()
        else:

            ##WIP output format
            ##        if r.image_settings.file_format == 'OPENEXR':
            ##            fformat = 'EXR'
            ##            render.image_settings.color_mode = 'RGBA'
            ##        else:
            ##            fformat = 'TGA'
            ##            r.image_settings.file_format = 'TARGA'
            ##            r.image_settings.color_mode = 'RGBA'

            blendSceneName = bpy.data.filepath.split(os.path.sep)[-1].split(
                "."
            )[0]
            povSceneName = ""
            povPath = ""
            renderImagePath = ""

            # has to be called to update the frame on exporting animations
            scene.frame_set(scene.frame_current)

            if not scene.pov.tempfiles_enable:

                # check paths
                povPath = bpy.path.abspath(scene.pov.scene_path).replace(
                    '\\', '/'
                )
                if povPath == "":
                    if bpy.data.is_saved:
                        povPath = bpy.path.abspath("//")
                    else:
                        povPath = tempfile.gettempdir()
                elif povPath.endswith("/"):
                    if povPath == "/":
                        povPath = bpy.path.abspath("//")
                    else:
                        povPath = bpy.path.abspath(scene.pov.scene_path)

                if not os.path.exists(povPath):
                    try:
                        os.makedirs(povPath)
                    except:
                        import traceback

                        traceback.print_exc()

                        print(
                            "POV-Ray 3.7: Cannot create scenes directory: %r"
                            % povPath
                        )
                        self.update_stats(
                            "",
                            "POV-Ray 3.7: Cannot create scenes directory %r"
                            % povPath,
                        )
                        time.sleep(2.0)
                        # return

                '''
                # Bug in POV-Ray RC3
                renderImagePath = bpy.path.abspath(scene.pov.renderimage_path).replace('\\','/')
                if renderImagePath == "":
                    if bpy.data.is_saved:
                        renderImagePath = bpy.path.abspath("//")
                    else:
                        renderImagePath = tempfile.gettempdir()
                    #print("Path: " + renderImagePath)
                elif path.endswith("/"):
                    if renderImagePath == "/":
                        renderImagePath = bpy.path.abspath("//")
                    else:
                        renderImagePath = bpy.path.abspath(scene.pov.renderimage_path)
                if not os.path.exists(path):
                    print("POV-Ray 3.7: Cannot find render image directory")
                    self.update_stats("", "POV-Ray 3.7: Cannot find render image directory")
                    time.sleep(2.0)
                    return
                '''

                # check name
                if scene.pov.scene_name == "":
                    if blendSceneName != "":
                        povSceneName = blendSceneName
                    else:
                        povSceneName = "untitled"
                else:
                    povSceneName = scene.pov.scene_name
                    if os.path.isfile(povSceneName):
                        povSceneName = os.path.basename(povSceneName)
                    povSceneName = povSceneName.split('/')[-1].split('\\')[-1]
                    if not povSceneName:
                        print("POV-Ray 3.7: Invalid scene name")
                        self.update_stats("", "POV-Ray 3.7: Invalid scene name")
                        time.sleep(2.0)
                        # return
                    povSceneName = os.path.splitext(povSceneName)[0]

                print("Scene name: " + povSceneName)
                print("Export path: " + povPath)
                povPath = os.path.join(povPath, povSceneName)
                povPath = os.path.realpath(povPath)

                # for now this has to be the same like the pov output. Bug in POV-Ray RC3.
                # renderImagePath = renderImagePath + "\\" + povSceneName
                renderImagePath = povPath  # Bugfix for POV-Ray RC3 bug
                # renderImagePath = os.path.realpath(renderImagePath)  # Bugfix for POV-Ray RC3 bug

                # print("Export path: %s" % povPath)
                # print("Render Image path: %s" % renderImagePath)

            # start export
            self.update_stats("", "POV-Ray 3.7: Exporting data from Blender")
            self._export(depsgraph, povPath, renderImagePath)
            self.update_stats("", "POV-Ray 3.7: Parsing File")

            if not self._render(depsgraph):
                self.update_stats("", "POV-Ray 3.7: Not found")
                # return

            # r = scene.render
            # compute resolution
            # x = int(r.resolution_x * r.resolution_percentage * 0.01)
            # y = int(r.resolution_y * r.resolution_percentage * 0.01)

            # Wait for the file to be created
            # XXX This is no more valid, as 3.7 always creates output file once render is finished!
            parsing = re.compile(br"= \[Parsing\.\.\.\] =")
            rendering = re.compile(br"= \[Rendering\.\.\.\] =")
            percent = re.compile(r"\(([0-9]{1,3})%\)")
            # print("***POV WAITING FOR FILE***")

            data = b""
            last_line = ""
            while _test_wait():
                # POV in Windows did not output its stdout/stderr, it displayed them in its GUI
                # But now writes file
                if self._is_windows:
                    self.update_stats("", "POV-Ray 3.7: Rendering File")
                else:
                    t_data = self._process.stdout.read(10000)
                    if not t_data:
                        continue

                    data += t_data
                    # XXX This is working for UNIX, not sure whether it might need adjustments for
                    #     other OSs
                    # First replace is for windows
                    t_data = (
                        str(t_data)
                        .replace('\\r\\n', '\\n')
                        .replace('\\r', '\r')
                    )
                    lines = t_data.split('\\n')
                    last_line += lines[0]
                    lines[0] = last_line
                    print('\n'.join(lines), end="")
                    last_line = lines[-1]

                    if rendering.search(data):
                        _pov_rendering = True
                        match = percent.findall(str(data))
                        if match:
                            self.update_stats(
                                "",
                                "POV-Ray 3.7: Rendering File (%s%%)"
                                % match[-1],
                            )
                        else:
                            self.update_stats("", "POV-Ray 3.7: Rendering File")

                    elif parsing.search(data):
                        self.update_stats("", "POV-Ray 3.7: Parsing File")

            if os.path.exists(self._temp_file_out):
                # print("***POV FILE OK***")
                # self.update_stats("", "POV-Ray 3.7: Rendering")

                # prev_size = -1

                xmin = int(r.border_min_x * x)
                ymin = int(r.border_min_y * y)
                xmax = int(r.border_max_x * x)
                ymax = int(r.border_max_y * y)

                # print("***POV UPDATING IMAGE***")
                result = self.begin_result(0, 0, x, y)
                # XXX, tests for border render.
                # result = self.begin_result(xmin, ymin, xmax - xmin, ymax - ymin)
                # result = self.begin_result(0, 0, xmax - xmin, ymax - ymin)
                lay = result.layers[0]

                # This assumes the file has been fully written We wait a bit, just in case!
                time.sleep(self.DELAY)
                try:
                    lay.load_from_file(self._temp_file_out)
                    # XXX, tests for border render.
                    # lay.load_from_file(self._temp_file_out, xmin, ymin)
                except RuntimeError:
                    print("***POV ERROR WHILE READING OUTPUT FILE***")

                # Not needed right now, might only be useful if we find a way to use temp raw output of
                # pov 3.7 (in which case it might go under _test_wait()).
                '''
                def update_image():
                    # possible the image wont load early on.
                    try:
                        lay.load_from_file(self._temp_file_out)
                        # XXX, tests for border render.
                        #lay.load_from_file(self._temp_file_out, xmin, ymin)
                        #lay.load_from_file(self._temp_file_out, xmin, ymin)
                    except RuntimeError:
                        pass

                # Update while POV-Ray renders
                while True:
                    # print("***POV RENDER LOOP***")

                    # test if POV-Ray exists
                    if self._process.poll() is not None:
                        print("***POV PROCESS FINISHED***")
                        update_image()
                        break

                    # user exit
                    if self.test_break():
                        try:
                            self._process.terminate()
                            print("***POV PROCESS INTERRUPTED***")
                        except OSError:
                            pass

                        break

                    # Would be nice to redirect the output
                    # stdout_value, stderr_value = self._process.communicate() # locks

                    # check if the file updated
                    new_size = os.path.getsize(self._temp_file_out)

                    if new_size != prev_size:
                        update_image()
                        prev_size = new_size

                    time.sleep(self.DELAY)
                '''

                self.end_result(result)

            else:
                print("***POV FILE NOT FOUND***")

            print("***POV FILE FINISHED***")

            # print(filename_log) #bring the pov log to blender console with proper path?
            with open(
                self._temp_file_log
            ) as f:  # The with keyword automatically closes the file when you are done
                print(f.read())

            self.update_stats("", "")

            if scene.pov.tempfiles_enable or scene.pov.deletefiles_enable:
                self._cleanup()


##################################################################################
#################################Operators########################################
##################################################################################
class RenderPovTexturePreview(Operator):
    """Export only files necessary to texture preview and render image."""

    bl_idname = "tex.preview_update"
    bl_label = "Update preview"

    def execute(self, context):
        tex = (
            bpy.context.object.active_material.active_texture
        )  # context.texture
        texPrevName = (
            string_strip_hyphen(bpy.path.clean_name(tex.name)) + "_prev"
        )

        ## Make sure Preview directory exists and is empty
        if not os.path.isdir(preview_dir):
            os.mkdir(preview_dir)

        iniPrevFile = os.path.join(preview_dir, "Preview.ini")
        inputPrevFile = os.path.join(preview_dir, "Preview.pov")
        outputPrevFile = os.path.join(preview_dir, texPrevName)
        ##################### ini ##########################################
        fileIni = open("%s" % iniPrevFile, "w")
        fileIni.write('Version=3.7\n')
        fileIni.write('Input_File_Name="%s"\n' % inputPrevFile)
        fileIni.write('Output_File_Name="%s.png"\n' % outputPrevFile)
        fileIni.write('Library_Path="%s"\n' % preview_dir)
        fileIni.write('Width=256\n')
        fileIni.write('Height=256\n')
        fileIni.write('Pause_When_Done=0\n')
        fileIni.write('Output_File_Type=N\n')
        fileIni.write('Output_Alpha=1\n')
        fileIni.write('Antialias=on\n')
        fileIni.write('Sampling_Method=2\n')
        fileIni.write('Antialias_Depth=3\n')
        fileIni.write('-d\n')
        fileIni.close()
        ##################### pov ##########################################
        filePov = open("%s" % inputPrevFile, "w")
        PATname = "PAT_" + string_strip_hyphen(bpy.path.clean_name(tex.name))
        filePov.write("#declare %s = \n" % PATname)
        filePov.write(shading.exportPattern(tex, string_strip_hyphen))

        filePov.write("#declare Plane =\n")
        filePov.write("mesh {\n")
        filePov.write(
            "    triangle {<-2.021,-1.744,2.021>,<-2.021,-1.744,-2.021>,<2.021,-1.744,2.021>}\n"
        )
        filePov.write(
            "    triangle {<-2.021,-1.744,-2.021>,<2.021,-1.744,-2.021>,<2.021,-1.744,2.021>}\n"
        )
        filePov.write("    texture{%s}\n" % PATname)
        filePov.write("}\n")
        filePov.write("object {Plane}\n")
        filePov.write("light_source {\n")
        filePov.write("    <0,4.38,-1.92e-07>\n")
        filePov.write("    color rgb<4, 4, 4>\n")
        filePov.write("    parallel\n")
        filePov.write("    point_at  <0, 0, -1>\n")
        filePov.write("}\n")
        filePov.write("camera {\n")
        filePov.write("    location  <0, 0, 0>\n")
        filePov.write("    look_at  <0, 0, -1>\n")
        filePov.write("    right <-1.0, 0, 0>\n")
        filePov.write("    up <0, 1, 0>\n")
        filePov.write("    angle  96.805211\n")
        filePov.write("    rotate  <-90.000003, -0.000000, 0.000000>\n")
        filePov.write("    translate <0.000000, 0.000000, 0.000000>\n")
        filePov.write("}\n")
        filePov.close()
        ##################### end write ##########################################

        pov_binary = PovrayRender._locate_binary()

        if sys.platform[:3] == "win":
            p1 = subprocess.Popen(
                ["%s" % pov_binary, "/EXIT", "%s" % iniPrevFile],
                stdout=subprocess.PIPE,
                stderr=subprocess.STDOUT,
            )
        else:
            p1 = subprocess.Popen(
                ["%s" % pov_binary, "-d", "%s" % iniPrevFile],
                stdout=subprocess.PIPE,
                stderr=subprocess.STDOUT,
            )
        p1.wait()

        tex.use_nodes = True
        tree = tex.node_tree
        links = tree.links
        for n in tree.nodes:
            tree.nodes.remove(n)
        im = tree.nodes.new("TextureNodeImage")
        pathPrev = "%s.png" % outputPrevFile
        im.image = bpy.data.images.load(pathPrev)
        name = pathPrev
        name = name.split("/")
        name = name[len(name) - 1]
        im.name = name
        im.location = 200, 200
        previewer = tree.nodes.new('TextureNodeOutput')
        previewer.label = "Preview"
        previewer.location = 400, 400
        links.new(im.outputs[0], previewer.inputs[0])
        # tex.type="IMAGE" # makes clip extend possible
        # tex.extension="CLIP"
        return {'FINISHED'}


class RunPovTextRender(Operator):
    """Export files depending on text editor options and render image."""

    bl_idname = "text.run"
    bl_label = "Run"
    bl_context = "text"
    bl_description = "Run a render with this text only"

    def execute(self, context):
        scene = context.scene
        scene.pov.text_block = context.space_data.text.name

        bpy.ops.render.render()

        # empty text name property engain
        scene.pov.text_block = ""
        return {'FINISHED'}


classes = (PovrayRender, RenderPovTexturePreview, RunPovTextRender)


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

    for cls in classes:
        register_class(cls)


def unregister():
    from bpy.utils import unregister_class

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