diff --git a/README.md b/README.md
index 5436b69..4c5782c 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ This program comes without any warranty, to the extent permitted by applicable l
 		#where 1 is number of seconds:
 		refresh_players_seconds:1
 		
-* Has static html version of map (echo_chunkymap_table() php function) -- see example.php
+* Can show a static html version of map (echo_chunkymap_table() php function) -- see viewchunkymap.php
 	* Zoom in and out
 	* optionally echo name of world that was detected by the scheduled py file
 	* shows player location (can optionally show only first characters of name, for privacy; there is no saved setting yet, so to adjust, you must change the value of $nonprivate_name_beginning_char_count in chunkymap.php)	
@@ -78,11 +78,11 @@ world_path
 	(if you are not using /var/www/html/minetest/chunkymapdata, edit chunkymap-cronjob script to use the correct directory, then)
     `chmod +x set-minutely-crontab-job.sh && ./set-minutely-crontab-job.sh`
 * IF you are using Linux
-	* Either copy your code to example.php and use it, or just rename it to map.php (or anything you want) then link to it.
+	* Rename viewchunkymap.php so it won't be overwritten on update if you want to modify it (or anything you want) then make a link to it on your website or share the link some other way.
 	# The commands below will work if you are using the web installer, or have done mv minetest-chunkymap-master "$HOME/Downloads/minetest-chunkymap" (and if you are using /var/www/html/minetest -- otherwise change that below)
 	MT_MY_WEBSITE_PATH=/var/www/html/minetest
 	sudo cp -f "$HOME/Downloads/minetest-chunkymap/web/chunkymap.php" "$MT_MY_WEBSITE_PATH/chunkymap.php"
-	sudo cp --no-clobber "$HOME/Downloads/minetest-chunkymap/web/example.php" "$MT_MY_WEBSITE_PATH/viewchunkymap.php"
+	sudo cp -f "$HOME/Downloads/minetest-chunkymap/web/viewchunkymap.php" "$MT_MY_WEBSITE_PATH/viewchunkymap.php"
 	sudo cp -R --no-clobber "$HOME/Downloads/minetest-chunkymap/web/images/*" "$MT_MY_WEBSITE_PATH/images/"
 	#--no-clobber: do not overwrite existing
 	# after you do this, the update script will do it for you if you are using /var/www/html/minetest, otherwise edit the update script before using it to get these things updated
diff --git a/chunkymap-regen.py b/chunkymap-regen.py
index f97a654..bfe36e0 100644
--- a/chunkymap-regen.py
+++ b/chunkymap-regen.py
@@ -478,7 +478,7 @@ class MTChunks:
         install_list = list()
         install_list.append(InstalledFile("browser.php",source_web_path,dest_web_path))
         install_list.append(InstalledFile("chunkymap.php",source_web_path,dest_web_path))
-        install_list.append(InstalledFile("example.php",source_web_path,dest_web_path))
+        install_list.append(InstalledFile("viewchunkymap.php",source_web_path,dest_web_path))
         install_list.append(InstalledFile("zoom-in.png", source_web_chunkymapdata_images_path, dest_web_chunkymapdata_images_path))
         install_list.append(InstalledFile("zoom-out.png", source_web_chunkymapdata_images_path, dest_web_chunkymapdata_images_path))
         install_list.append(InstalledFile("zoom-in_disabled.png", source_web_chunkymapdata_images_path, dest_web_chunkymapdata_images_path))
@@ -584,6 +584,47 @@ class MTChunks:
         # 0 becomes 0
         #-1 becomes -10
         return int(decachunky_x*10)
+    
+    def is_worldborder_chunk(self, chunky_x, chunky_z):
+        result = False
+        image_path = get_chunk_image_path(chunky_x, chunky_z)
+        if os.path.isfile(image_path):
+            original_im = Image.open(image_path)
+            im = original_im
+            if im.bits<24:
+                im = original_im.convert('RGB')
+            width, height = im.size
+            pixel_count = width*height
+            pixel_count_f = float(pixel_count)
+            border_count = 0
+            FLAG_COLORS_LIST = list()
+            FLAG_COLOR_CHANNELS = get_list_from_hex(self.FLAG_EMPTY_HEXCOLOR)
+            FLAG_COLORS_LIST.append(FLAG_COLOR_CHANNELS)
+            FLAG_COLORS_LIST.append((255,255,255))  #for compatibility with maps generated by earlier versions ONLY
+            FLAG_COLORS_LIST.append((0,0,0))  #for compatibility with maps generated by earlier versions ONLY
+            for FLAG_COLOR in FLAG_COLORS_LIST:
+                if len(FLAG_COLOR)==3 or len(FLAG_COLOR)==4:
+                    for y in range(0,height):
+                        for x in range(0,width):
+                            r, g, b = im.getpixel((x, y))
+                            if r==FLAG_COLOR[0] and g==FLAG_COLOR[1] and b==FLAG_COLOR[2]:
+                                border_pixel_count += 1
+                    if float(border_pixel_count)/pixel_count_f >=.51:
+                        result = True
+                        break
+                else:
+                    raw_input("ERROR: FLAG_COLOR (obtained from FLAG_EMPTY_HEXCOLOR) has "+len(FLAG_COLOR)+" element(s) (3 or 4 expected)")
+        return result
+
+    def is_chunk_on_todo_list(self, chunky_pos):
+        result = -1
+        if self.todo_index<len(self.todo_positions):
+            for index in range(self.todo_index,len(self.todo_positions)):
+                if ivec2_equals(self.todo_positions[index], chunky_pos):
+                    result = index
+                    break
+        return result
+        
 
     def check_decachunk_containing_chunk(self, chunky_x, chunky_z):
         chunky_coord_list = list()
@@ -601,30 +642,61 @@ class MTChunks:
         chunky_offset_z = 0
         chunky_z = chunky_min_z
         queued_index = None
+        is_chunk_complete = False
         while chunky_z <= chunky_max_z:
             preview_strings[chunky_offset_z] = ""
             chunky_x = chunky_min_x
             while chunky_x <= chunky_max_x:
                 coords = (chunky_x, chunky_z)
                 chunky_coord_list.append( coords )
-                if self.todo_index<len(self.todo_positions):
-                    for index in range(self.todo_index,len(self.todo_positions)):
-                        if ivec2_equals(self.todo_positions[index], coords):
-                            is_any_part_queued = True
-                            if queued_chunk_coords is None:
-                                queued_chunk_coords = list()
-                            queued_chunk_coords.append(coords)
-                            queued_index = index
-                            break
+                is_any_part_queued = is_chunk_on_todo_list(coords)
                 if is_any_part_queued:
+                    if queued_chunk_coords is None:
+                        queued_chunk_coords = list()
+                    queued_chunk_coords.append(coords)
                     break
                 chunky_x += 1
             if is_any_part_queued:
                 break
             chunky_z += 1
             chunky_offset_z += 1
+        if not is_any_part_queued:
+            is_chunk_complete = True
+        
+        if is_chunk_complete:
+            ### NOTE: a chunk is incomplete if any rendered nonworldborder chunk touches a nonrendered chunk
+            for chunky_pos in chunky_coord_list:
+                this_chunky_x, this_chunky_z = chunky_pos
+                if not self.is_chunk_rendered_on_dest(this_chunky_x, this_chunky_z):
+                    outline_coords_list = self.get_outline_coords_list(this_chunky_x, this_chunky_z, True)
+                    if outline_coords_list is not None:
+                        for nearby_chunky_pos in outline_coords_list:
+                            nearby_chunky_x, nearby_chunky_z = nearby_chunky_pos
+                            nearby_chunk_luid = self.get_chunk_luid(nearby_chunky_x, nearby_chunky_z)
+                            if (nearby_chunk_luid in self.chunks and self.chunks[nearby_chunk_luid].is_fresh) or self.is_chunk_rendered_on_dest(nearby_chunky_x, nearby_chunky_z):
+                                this_is_worldborder_chunk = False
+                                if (nearby_chunk_luid in self.chunks and "is_worldborder" in self.chunks[nearby_chunk_luid].metadata and self.chunks[nearby_chunk_luid].metadata["is_worldborder"]):
+                                    this_is_worldborder_chunk = True
+                                elif self.is_worldborder_chunk(nearby_chunky_x, nearby_chunky_z):
+                                    this_is_worldborder_chunk = True
+                                    self.prepare_chunk_meta(nearby_chunky_x, nearby_chunky_z)
+                                    if "is_worldborder" not in self.chunks[nearby_chunk_luid].metadata or (self.chunks[nearby_chunk_luid].metadata["is_worldborder"] != True)
+                                        self.chunks[nearby_chunk_luid].metadata["is_worldborder"] = True
+                                        self.save_chunk_meta(nearby_chunky_x, nearby_chunky_z)
+                                if not this_is_worldborder_chunk:
+                                    #empty chunk would not touch NON-worldborder chunk if decachunk was complete
+                                    is_chunk_complete = False
+                                    break
+                    else:
+                        print(self.min_indent+"ERROR in check_decachunk_containing_chunk: no outline of chunks could be found around "+str(chunky_pos))
+                if not is_chunk_complete:
+                    break
+        
+        
+        
         #if not is_any_part_queued:
-        if queued_chunk_coords is None:
+        #if queued_chunk_coords is None:
+        if is_chunk_complete and not is_any_part_queued:
             print("")
             print("")
             print("    Rendering 160px decachunk "+str((decachunky_x, decachunky_z)))
@@ -1002,6 +1074,11 @@ class MTChunks:
                         print("ERROR: chunk changed from nonempty to empty (may happen if output of mapper was not recognized)")
                     elif this_chunk.metadata["is_empty"] and os.path.isfile(dest_png_path):
                         print("ERROR: chunk marked empty though has data (may happen if output of mapper was not recognized)")
+                this_is_worldborder_chunk = self.is_worldborder_chunk(chunky_x, chunky_z)
+                if ("is_worldborder" not in self.chunks[chunk_luid].metadata) or this_is_worldborder_chunk != self.chunks[chunk_luid].metadata["is_worldborder"]:
+                    self.chunks[chunk_luid].metadata["is_worldborder"] = this_is_worldborder_chunk
+                    is_changed = True
+
                 #chunk_yaml_path = self.get_chunk_yaml_path(chunky_x, chunky_z)
                 #self.create_chunk_folder(chunky_x, chunky_z)
                 #this_chunk.save_yaml(chunk_yaml_path)
@@ -1317,16 +1394,21 @@ class MTChunks:
                     #must check_decachunk_containing_chunk AFTER _check_map_pseudorecursion_branchfrom so check_decachunk_containing_chunk can see if there are more to do before rendering superchunk
                     #always check since already checks queue and doesn't render decachunk on last rendered chunk, but instead on last queued chunk in decachunk
                     #if self.rendered_this_session_count>prev_rendered_this_session_count or self.force_rerender_decachunks_enable:
-                    self.check_decachunk_containing_chunk(chunky_x, chunky_z)
+                    #self.check_decachunk_containing_chunk(chunky_x, chunky_z)
                     if self.verbose_enable:
                         print(min_indent+"["+str(self.todo_index)+"] branching from "+str((chunky_x, chunky_z))+" (added "+str(len(self.todo_positions)-prev_len)+")")
                 else:
+                    #self.check_decachunk_containing_chunk(chunky_x, chunky_z)
                     if self.verbose_enable:
                         print(min_indent+"["+str(self.todo_index)+"] not branching from "+str((chunky_x, chunky_z)))
                 self.todo_index += 1
-            if self.todo_index>=len(self.todo_positions):  # check again since may have branched above, making this untrue
+                
+                #check_decachunk_containing_chunk AFTER incrementing todo_index so that self being queued doesn't prevent decachunk render:
+                self.check_decachunk_containing_chunk(chunky_x, chunky_z)
+           if self.todo_index>=len(self.todo_positions):  # check again since may have branched above, making this untrue
                 self.save_mapvars_if_changed()
                 self.todo_index = -1
+                self.todo_positions = list()
         else:
             if self.verbose_enable:
                 print(min_indent+"(no branches)")
@@ -1417,6 +1499,74 @@ class MTChunks:
             print("")
             print("")
 
+    def get_cross_coords_list(x_int, y_int, restrict_to_decachunk_enable=False):
+        results = None
+        if x_int is not None and y_int is not None:
+            tmp = list()
+            # North, East, South, West (cartesian):
+            tmp.append((x_int,y_int+1))
+            tmp.append((x_int+1,y_int))
+            tmp.append((x_int,y_int-1))
+            tmp.append((x_int-1,y_int))
+            if restrict_to_decachunk_enable:
+                results = list()
+                starting_decachunk_luid = self.get_decachunk_luid_from_chunk(x_int, y_int)
+                for result in tmp:
+                    this_x, this_y = result
+                    if self.get_decachunk_luid_from_chunk(this_x, this_y) == starting_decachunk_luid:
+                        results.append(result)
+            else:
+                results = tmp
+        return results
+
+    def get_outline_coords_list(x_int, y_int, restrict_to_decachunk_enable=False):
+        results = None
+        if x_int is not None and y_int is not None:
+            tmp = list()
+            # North, NE, East, SE, South, SW, West, NW (cartesian):
+            tmp.append((x_int,y_int+1))  # N
+            tmp.append((x_int+1,y_int+1))  # NE
+            tmp.append((x_int+1,y_int))  # E
+            tmp.append((x_int+1,y_int-1))  # SE
+            tmp.append((x_int,y_int-1)) # S
+            tmp.append((x_int-1,y_int-1)) # SW
+            tmp.append((x_int-1,y_int)) # W
+            tmp.append((x_int-1,y_int+1)) # NW
+            if restrict_to_decachunk_enable:
+                results = list()
+                starting_decachunk_luid = self.get_decachunk_luid_from_chunk(x_int, y_int)
+                for result in tmp:
+                    this_x, this_y = result
+                    if self.get_decachunk_luid_from_chunk(this_x, this_y) == starting_decachunk_luid:
+                        results.append(result)
+            else:
+                results = tmp
+        return results
+
+    def is_worldborder_count_gt_or_eq(chunky_coords_list, min_count):
+        result = False
+        count = 0
+        for chunky_pos in chunky_coords_list:
+            if is_worldborder_chunk(chunky_pos[0], chunky_pos[1]):
+                count += 1
+                if count >= min_count:
+                    result = True
+                    break
+        return result
+        
+
+    def is_nonworldborder_isrendered_count_gt_or_eq(chunky_coords_list, min_count):
+        result = False
+        count = 0
+        if chunky_coords_list is not None:
+            for chunky_pos in chunky_coords_list:
+                chunky_x, chunky_z = chunky_pos
+                if is_chunk_rendered_on_dest(chunky_x, chunky_z) and not is_worldborder_chunk(chunky_x, chunky_z):
+                    count += 1
+                    if count >= min_count:
+                        result = True
+                        break
+        return result
 
     def check_map_pseudorecursion_start(self):
         if self.todo_index<0:
diff --git a/chunkymap-signals example - turn on verbose.txt b/chunkymap-signals example - verbose_enable True.txt
similarity index 100%
rename from chunkymap-signals example - turn on verbose.txt
rename to chunkymap-signals example - verbose_enable True.txt
diff --git a/expertmm.py b/expertmm.py
index df67c67..f84806b 100644
--- a/expertmm.py
+++ b/expertmm.py
@@ -31,6 +31,8 @@ class InstalledFile:
         self.file_name=file_name
         self.source_dir_path=source_dir_path
         self.dest_dir_path=dest_dir_path
+        
+
 
 class ConfigManager:
     #config_name = None
@@ -138,7 +140,7 @@ def is_dict_subset(new_dict, old_dict, verbose_messages_enable, verbose_dest_des
         view_traceback()
     return is_changed
 
-def vec2_not_in(this_list, this_vec):
+def vec2_not_in(this_vec, this_list):
     result = False
     if this_list is not None and this_vec is not None:
         for try_vec in this_list:
@@ -261,6 +263,26 @@ def save_conf_from_dict(path, this_dict, assignment_operator="=", save_nulls_ena
             outs.close()
         except:
             pass
+            
+def get_list_from_hex(hex_string):
+    results = None
+    if hex_string is not None:
+        if len(hex_string)>=2:
+            if hex_string[:2]=="0x":
+                hex_string = hex_string[2:]
+            elif hex_string[:1]=="#":
+                hex_string = hex_string[1:]
+            if len(hex_string)>0 and hex_string[len(hex_string)-1:]=="h":
+                hex_string = hex_string[:len(hex_string)-1]
+            index = 0
+            while index<len(hex_string):
+                if results is None:
+                    results = list()
+                if len(hex_string)-index >= 2:
+                    results.append(int(hex_string[index:index+2], 16))
+                index += 2
+                
+    return results
 
 def get_tuple_from_notation(line, debug_src_name="<unknown object>"):
     result = None
diff --git a/minetestinfo.py b/minetestinfo.py
index ebc3389..8b34189 100644
--- a/minetestinfo.py
+++ b/minetestinfo.py
@@ -163,6 +163,9 @@ def load_world_and_mod_data():
                 this_primary_world_path = try_path
             minetestinfo._data["primary_world_path"] = this_primary_world_path
             auto_chosen_world = False
+        else:
+            if default_world_path is not None:
+                minetestinfo._data["primary_world_path"] = default_world_path
         minetestinfo.save_yaml()
 
     if get_world_var("gameid") != minetestinfo.get_var("game_path"):
diff --git a/update-chunkymap-on-ubuntu-from-web.sh b/update-chunkymap-on-ubuntu-from-web.sh
index a0a21f4..ec94682 100644
--- a/update-chunkymap-on-ubuntu-from-web.sh
+++ b/update-chunkymap-on-ubuntu-from-web.sh
@@ -24,8 +24,8 @@ MT_MY_WEBSITE_PATH=/var/www/html/minetest
 if [ -f "$HOME/Downloads/minetest-chunkymap/web/chunkymap.php" ]; then
 	if [ -f "$MT_MY_WEBSITE_PATH/chunkymap.php" ]; then
 		sudo cp -f "$HOME/Downloads/minetest-chunkymap/web/chunkymap.php" "$MT_MY_WEBSITE_PATH/"
-		#sudo cp --no-clobber "$HOME/Downloads/minetest-chunkymap/web/example.php" "$MT_MY_WEBSITE_PATH/viewchunkymap.php"
-		sudo cp -f "$HOME/Downloads/minetest-chunkymap/web/example.php" "$MT_MY_WEBSITE_PATH/example.php"
+		#sudo cp --no-clobber "$HOME/Downloads/minetest-chunkymap/web/viewchunkymap.php" "$MT_MY_WEBSITE_PATH/viewchunkymap.php"
+		sudo cp -f "$HOME/Downloads/minetest-chunkymap/web/viewchunkymap.php" "$MT_MY_WEBSITE_PATH/viewchunkymap.php"
 		# cannot put wildcard in quotes on unix
 		#sudo cp -R --no-clobber $HOME/Downloads/minetest-chunkymap/web/images/* "$MT_MY_WEBSITE_PATH/images/"
 		#--no-clobber: do not overwrite existing
diff --git a/web/chunkymap.php b/web/chunkymap.php
index 285aa99..819369b 100644
--- a/web/chunkymap.php
+++ b/web/chunkymap.php
@@ -1,8 +1,10 @@
 <?php
-#this is the backend--don't call it directly. instead do include_once('chunkymap.php'); for further info, see example.php
 ini_set('display_errors', 1);
 ini_set('display_startup_errors', 1);
 error_reporting(E_ALL);
+if (($_SERVER['PHP_SELF'] == "chunkymap.php") or endsWith($_SERVER['PHP_SELF'],"/chunkymap.php")) {
+	echo "<html><body style=\"font-family:calibri,arial,helvetica,sans\">This is the backend--don't call it directly. instead do include_once('chunkymap.php'); To use the map, go to <a href=\"viewchunkymap.php\">viewchunkymap.php</a> instead.</body></html>";
+}
 
 
 //NOTE: for parse errors, MUST add the following line to  php.ini (such as /etc/php5/apache2/php.ini): display_errors = on
diff --git a/web/update wamp www.bat b/web/update wamp www.bat
index 368f121..58160b3 100644
--- a/web/update wamp www.bat	
+++ b/web/update wamp www.bat	
@@ -3,10 +3,10 @@ SET SRC_MT_WEB_PATH=%USERPROFILE%\Documents\GitHub\minetest-chunkymap\web
 SET DEST_MT_WEBSITE_PATH=C:\wamp\www
 copy /y "%SRC_MT_WEB_PATH%\browser.php" "%DEST_MT_WEBSITE_PATH%\"
 copy /y "%SRC_MT_WEB_PATH%\chunkymap.php" "%DEST_MT_WEBSITE_PATH%\"
-copy /y "%SRC_MT_WEB_PATH%\example.php" "%DEST_MT_WEBSITE_PATH%\"
+copy /y "%SRC_MT_WEB_PATH%\viewchunkymap.php" "%DEST_MT_WEBSITE_PATH%\"
 
 SET DEST_MT_WEBSITE_CHUNKYMAP_IMAGES_PATH=%DEST_MT_WEBSITE_PATH%\chunkymapdata\images
 copy /y "%SRC_MT_WEB_PATH%\chunkymapdata_default\images\*" "%DEST_MT_WEBSITE_CHUNKYMAP_IMAGES_PATH%"
 
 
-if NOT ["%errorlevel%"]==["0"] pause
\ No newline at end of file
+if NOT ["%errorlevel%"]==["0"] pause
diff --git a/web/example.php b/web/viewchunkymap.php
similarity index 100%
rename from web/example.php
rename to web/viewchunkymap.php