diff --git a/quadtree.py b/quadtree.py
index f1c4b1d..fc00b01 100644
--- a/quadtree.py
+++ b/quadtree.py
@@ -426,9 +426,6 @@ class QuadtreeGen(object):
             needs_rerender = False
             get_region_mtime = world.get_region_mtime
             for col, row, chunkx, chunky, regionfile in chunks:
-                # don't even check if it's not in the regionlist
-                if self.world.regionlist and region._filename not in self.world.regionlist:
-                    continue
                 
                 # bail early if forcerender is set
                 if self.forcerender:
@@ -439,7 +436,11 @@ class QuadtreeGen(object):
                 region,regionMtime = get_region_mtime(regionfile)
                 if regionMtime <= tile_mtime:
                     continue
-                
+               
+                # don't even check if it's not in the regionlist
+                if self.world.regionlist and os.path.abspath(region._filename) not in self.world.regionlist:
+                    continue
+               
                 # checking chunk mtime
                 if region.get_chunk_timestamp(chunkx, chunky) > tile_mtime:
                     needs_rerender = True
diff --git a/sample.settings.py b/sample.settings.py
index 8c85a3e..3b6aed2 100644
--- a/sample.settings.py
+++ b/sample.settings.py
@@ -6,7 +6,7 @@
 # provide examples of interesting things you can do with the settings file. Most
 # of the time, a simple 'setting_name = value' will work.
 
-# This file is a python script, so you can import and python module you wish or
+# This file is a python script, so you can import any python module you wish or
 # use any built-in python function, though this is not normally necessary
 
 # Lines that start with a hash mark are comments
diff --git a/src/rendermode-lighting.c b/src/rendermode-lighting.c
index 6285724..2741cf0 100644
--- a/src/rendermode-lighting.c
+++ b/src/rendermode-lighting.c
@@ -33,21 +33,100 @@ static float calculate_darkness(unsigned char skylight, unsigned char blocklight
  * was calculated correctly from available light data, it will be true. You
  * may (and probably should) pass NULL.
  */
+
+inline unsigned char
+estimate_blocklevel(RenderModeLighting *self, RenderState *state,
+                         int x, int y, int z, int *authoratative) {
+
+    /* placeholders for later data arrays, coordinates */
+    PyObject *blocks = NULL;
+    PyObject *blocklight = NULL;
+    int local_x = x, local_y = y, local_z = z;
+    unsigned char block, blocklevel;
+    unsigned int average_count = 0, average_gather = 0, coeff = 0;
+
+    /* defaults to "guess" until told otherwise */
+    if (authoratative)
+        *authoratative = 0;
+    
+    /* find out what chunk we're in, and translate accordingly */
+    if (x >= 0 && y < 16) {
+        blocks = state->blocks;
+        blocklight = self->blocklight;
+    } else if (x < 0) {
+        local_x += 16;        
+        blocks = state->left_blocks;
+        blocklight = self->left_blocklight;
+    } else if (y >= 16) {
+        local_y -= 16;
+        blocks = state->right_blocks;
+        blocklight = self->right_blocklight;
+    }
+    
+    /* make sure we have correctly-ranged coordinates */
+    if (!(local_x >= 0 && local_x < 16 &&
+          local_y >= 0 && local_y < 16 &&
+          local_z >= 0 && local_z < 128)) {
+        
+        return 0;
+    }
+
+    /* also, make sure we have enough info to correctly calculate lighting */
+    if (blocks == Py_None || blocks == NULL ||
+        blocklight == Py_None || blocklight == NULL) {
+        
+        return 0;
+    }
+
+    block = getArrayByte3D(blocks, local_x, local_y, local_z);
+    
+    if (authoratative == NULL) {
+        int auth;
+        
+        /* iterate through all surrounding blocks to take an average */
+        int dx, dy, dz, local_block;
+        for (dx = -1; dx <= 1; dx += 2) {
+            for (dy = -1; dy <= 1; dy += 2) {
+                for (dz = -1; dz <= 1; dz += 2) {
+                    coeff = estimate_blocklevel(self, state, x+dx, y+dy, z+dz, &auth);
+                    local_block = getArrayByte3D(blocks, x+dx, y+dy, z+dz);
+                    /* only add if the block is transparent, this seems to look better than
+                       using every block */
+                    if (auth && is_transparent(local_block)) {
+                        average_gather += coeff;
+                        average_count++;
+                    }
+                }
+            }
+        }
+    }
+    
+    /* only return the average if at least one was authoratative */
+    if (average_count > 0) {
+        return average_gather / average_count;
+    }
+    
+    blocklevel = getArrayByte3D(blocklight, local_x, local_y, local_z);
+    
+    /* no longer a guess */
+    if (!(block == 44 || block == 53 || block == 67) && authoratative) {
+        *authoratative = 1;
+    }
+    
+    return blocklevel;
+}
+
 inline float
 get_lighting_coefficient(RenderModeLighting *self, RenderState *state,
-                         int x, int y, int z, int *authoratative) {
-    
+                         int x, int y, int z) {
+
     /* placeholders for later data arrays, coordinates */
     PyObject *blocks = NULL;
     PyObject *skylight = NULL;
     PyObject *blocklight = NULL;
     int local_x = x, local_y = y, local_z = z;
     unsigned char block, skylevel, blocklevel;
-    
-    /* defaults to "guess" until told otherwise */
-    if (authoratative)
-        *authoratative = 0;
-    
+
     /* find out what chunk we're in, and translate accordingly */
     if (x >= 0 && y < 16) {
         blocks = state->blocks;
@@ -64,7 +143,7 @@ get_lighting_coefficient(RenderModeLighting *self, RenderState *state,
         skylight = self->right_skylight;
         blocklight = self->right_blocklight;
     }
-    
+
     /* make sure we have correctly-ranged coordinates */
     if (!(local_x >= 0 && local_x < 16 &&
           local_y >= 0 && local_y < 16 &&
@@ -72,7 +151,7 @@ get_lighting_coefficient(RenderModeLighting *self, RenderState *state,
         
         return self->calculate_darkness(15, 0);
     }
-    
+
     /* also, make sure we have enough info to correctly calculate lighting */
     if (blocks == Py_None || blocks == NULL ||
         skylight == Py_None || skylight == NULL ||
@@ -82,49 +161,28 @@ get_lighting_coefficient(RenderModeLighting *self, RenderState *state,
     }
     
     block = getArrayByte3D(blocks, local_x, local_y, local_z);
-    
-    /* only do special half-step handling if no authoratative pointer was
-       passed in, which is a sign that we're recursing */
-    if ((block == 44 || block == 53 || block == 67) && authoratative == NULL) {
-        float average_gather = 0.0f;
-        unsigned int average_count = 0, upper_block;
-        int auth;
-        float coeff;
+    skylevel = getArrayByte3D(skylight, local_x, local_y, local_z);
+    blocklevel = getArrayByte3D(blocklight, local_x, local_y, local_z);
+
+    /* special half-step handling */
+    if (block == 44 || block == 53 || block == 67) {
+        unsigned int upper_block;
         
-        if (local_z != 127) { /* stairs and half-blocks take the skylevel from the upper block if it's transparent */
+        /* stairs and half-blocks take the skylevel from the upper block if it's transparent */
+        if (local_z != 127) {
             upper_block = getArrayByte3D(blocks, local_x, local_y, local_z + 1);
             if (is_transparent(upper_block)) {
                 skylevel = getArrayByte3D(skylight, local_x, local_y, local_z + 1);
             }
-            blocklevel = getArrayByte3D(blocklight, local_x, local_y, local_z);
         } else {
             upper_block = 0;
             skylevel = 15;
-            blocklevel = getArrayByte3D(blocklight, local_x, local_y, local_z);
         }
+        
+        /* the block has a bad blocklevel, estimate it from neigborhood
+        /* use given coordinates, no local ones! */
+        blocklevel = estimate_blocklevel(self, state, x, y, z, NULL);
 
-        if (skylevel) { /* if we have a good skylevel use it, if not iterate */
-            return self->calculate_darkness(skylevel, blocklevel);
-        } else {
-
-            /* iterate through all surrounding blocks to take an average */
-            int dx, dy, dz;
-            for (dx = -1; dx <= 1; dx += 2) {
-                for (dy = -1; dy <= 1; dy += 2) {
-                    for (dz = -1; dz <= 1; dz += 2) {
-                        coeff = get_lighting_coefficient(self, state, x+dx, y+dy, z+dz, &auth);
-                        if (auth) {
-                            average_gather += coeff;
-                            average_count++;
-                        }
-                    }
-                }
-            }
-            
-            /* only return the average if at least one was authoratative */
-            if (average_count > 0)
-                return average_gather / average_count;
-        }
     }
     
     if (block == 10 || block == 11) {
@@ -132,13 +190,6 @@ get_lighting_coefficient(RenderModeLighting *self, RenderState *state,
         return 0.0f;
     }
     
-    skylevel = getArrayByte3D(skylight, local_x, local_y, local_z);
-    blocklevel = getArrayByte3D(blocklight, local_x, local_y, local_z);
-    
-    /* no longer a guess */
-    if (authoratative)
-        *authoratative = 1;
-    
     return self->calculate_darkness(skylevel, blocklevel);
 }
 
@@ -161,7 +212,7 @@ do_shading_with_mask(RenderModeLighting *self, RenderState *state,
         }
     }
     
-    black_coeff = get_lighting_coefficient(self, state, x, y, z, NULL);
+    black_coeff = get_lighting_coefficient(self, state, x, y, z);
     black_coeff *= self->shade_strength;
     alpha_over_full(state->img, self->black_color, mask, black_coeff, state->imgx, state->imgy, 0, 0);
 }
diff --git a/textures.py b/textures.py
index 5171285..5e2db3b 100644
--- a/textures.py
+++ b/textures.py
@@ -493,13 +493,7 @@ def generate_opaque_mask(img):
     smallers than 50, and sets every other value to 255. """
     
     alpha = img.split()[3]
-    pixel = alpha.load()
-    for x in range(img.size[0]):
-        for y in range(img.size[1]):
-            if pixel[x,y] > 25:
-                pixel[x,y] = 255
-    
-    return alpha
+    return alpha.point(lambda a: int(min(a, 25.5) * 10))
 
 def generate_texture_tuple(img, blockid):
     """ This takes an image and returns the needed tuple for the
diff --git a/web_assets/overviewer.css b/web_assets/overviewer.css
index dc435fa..f4bdd98 100644
--- a/web_assets/overviewer.css
+++ b/web_assets/overviewer.css
@@ -7,6 +7,10 @@ body {
     margin: 0px;
     padding: 0px;
     background-color: #000;
+
+    font-family: Arial, sans-serif;
+    font-size: 12px;
+    line-height: 160%;
 }
 
 #mcmap {
@@ -82,7 +86,7 @@ body {
 }
 
 
-#link {
+#link, #coordsDiv {
     background-color: #fff; /* fallback */
     background-color: rgba(255,255,255,0.55);
     border: 1px solid rgb(0, 0, 0);
diff --git a/web_assets/overviewer.js b/web_assets/overviewer.js
index ceeb7dc..ea87a19 100644
--- a/web_assets/overviewer.js
+++ b/web_assets/overviewer.js
@@ -591,6 +591,17 @@ var overviewer = {
                 overviewer.map.controls[google.maps.ControlPosition.TOP_RIGHT].push(homeControlDiv);
             }
 
+            // Coords box
+            var coordsDiv = document.createElement('DIV');
+            coordsDiv.id = 'coordsDiv';
+            coordsDiv.innerHTML = '';
+            overviewer.map.controls[google.maps.ControlPosition.BOTTOM_LEFT].push(coordsDiv);
+            // Update coords on mousemove
+            google.maps.event.addListener(overviewer.map, 'mousemove', function (event) {
+                var worldcoords = overviewer.util.fromLatLngToWorld(event.latLng.lat(), event.latLng.lng());
+                coordsDiv.innerHTML = "Coords: X " + Math.round(worldcoords.x) + ", Z " + Math.round(worldcoords.z);
+            });
+
             // only need to create the control if there are items in the list.
             // as defined in config.js
             if (overviewerConfig.objectGroups.signs.length > 0) {
diff --git a/world.py b/world.py
index 564d193..1344d10 100644
--- a/world.py
+++ b/world.py
@@ -78,7 +78,10 @@ class World(object):
         logging.info("Scanning regions")
         regionfiles = {}
         self.regions = {}
-        self.regionlist = regionlist # a list of paths
+        if regionlist:
+            self.regionlist = map(os.path.abspath, regionlist) # a list of paths
+        else:
+            self.regionlist = None
         for x, y, regionfile in self._iterate_regionfiles():
             mcr = self.reload_region(regionfile) 
             mcr.get_chunk_info()