render.py

            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):
    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'}