render.py

            for dirName in sysPathList:
                if (os.path.exists(os.path.join(dirName, pov_binary))):
                    isExists = True
                    break

            if not isExists:
                print("POV-Ray 3.7: could not found execute '%s' - not if PATH" % pov_binary)
                import traceback
                traceback.print_exc()
                print ("***-DONE-***")
                return False

            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("POV-Ray 3.7 found")
                print("Command line arguments passed: " + str(extra_args))
                return True

        # Now that we have a valid process

    def _cleanup(self):
        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)

    def render(self, scene):
        import tempfile

        print("***INITIALIZING***")

##WIP output format
##        if r.file_format == 'OPENEXR':
##            fformat = 'EXR'
##            render.color_mode = 'RGBA'
##        else:
##            fformat = 'TGA'
##            r.file_format = 'TARGA'
##            r.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.path.abspath("//") != "":
                    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.path.abspath("//") != "":
                    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(scene, povPath, renderImagePath)
        self.update_stats("", "POV-Ray 3.7: Parsing File")

        if not self._render(scene):
            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)

        # 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

        # 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 does not output its stdout/stderr, it displays them in its GUI
            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 FINISHED***")

        self.update_stats("", "")

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