diff --git a/res/content/base/blocks/glass.json b/res/content/base/blocks/glass.json
index c782c0c8f..c56bdd558 100644
--- a/res/content/base/blocks/glass.json
+++ b/res/content/base/blocks/glass.json
@@ -1,5 +1,6 @@
 {
     "texture": "glass",
     "draw-group": 2,
-    "light-passing": true
-}
\ No newline at end of file
+    "light-passing": true,
+    "sky-light-passing": true
+}
diff --git a/src/lighting/LightSolver.cpp b/src/lighting/LightSolver.cpp
index d103b65b2..12e09d5da 100644
--- a/src/lighting/LightSolver.cpp
+++ b/src/lighting/LightSolver.cpp
@@ -58,9 +58,11 @@ void LightSolver::solve(){
 		remqueue.pop();
 
 		for (int i = 0; i < 6; i++) {
-			int x = entry.x+coords[i*3+0];
-			int y = entry.y+coords[i*3+1];
-			int z = entry.z+coords[i*3+2];
+			int imul3 = i*3;
+			int x = entry.x+coords[imul3];
+			int y = entry.y+coords[imul3+1];
+			int z = entry.z+coords[imul3+2];
+			
 			Chunk* chunk = chunks->getChunkByVoxel(x,y,z);
 			if (chunk) {
 				int lx = x - chunk->x * CHUNK_W;
@@ -85,9 +87,11 @@ void LightSolver::solve(){
 		addqueue.pop();
 
 		for (int i = 0; i < 6; i++) {
-			int x = entry.x+coords[i*3+0];
-			int y = entry.y+coords[i*3+1];
-			int z = entry.z+coords[i*3+2];
+			int imul3 = i*3;
+			int x = entry.x+coords[imul3];
+			int y = entry.y+coords[imul3+1];
+			int z = entry.z+coords[imul3+2];
+
 			Chunk* chunk = chunks->getChunkByVoxel(x,y,z);
 			if (chunk) {
 				int lx = x - chunk->x * CHUNK_W;
diff --git a/src/lighting/Lighting.cpp b/src/lighting/Lighting.cpp
index 6433db4f1..a79b066d7 100644
--- a/src/lighting/Lighting.cpp
+++ b/src/lighting/Lighting.cpp
@@ -152,10 +152,11 @@ void Lighting::onChunkLoaded(int cx, int cz, bool expand){
 
 void Lighting::onBlockSet(int x, int y, int z, blockid_t id){
 	Block* block = content->getIndices()->getBlockDef(id);
+	solverR->remove(x,y,z);
+	solverG->remove(x,y,z);
+	solverB->remove(x,y,z);
+
 	if (id == 0){
-		solverR->remove(x,y,z);
-		solverG->remove(x,y,z);
-		solverB->remove(x,y,z);
 		solverR->solve();
 		solverG->solve();
 		solverB->solve();
@@ -178,9 +179,6 @@ void Lighting::onBlockSet(int x, int y, int z, blockid_t id){
 		solverB->solve();
 		solverS->solve();
 	} else {
-		solverR->remove(x,y,z);
-		solverG->remove(x,y,z);
-		solverB->remove(x,y,z);
 		if (!block->skyLightPassing){
 			solverS->remove(x,y,z);
 			for (int i = y-1; i >= 0; i--){
diff --git a/src/logic/scripting/lua/api_lua.cpp b/src/logic/scripting/lua/api_lua.cpp
index dd47dab44..54ef69097 100644
--- a/src/logic/scripting/lua/api_lua.cpp
+++ b/src/logic/scripting/lua/api_lua.cpp
@@ -90,6 +90,78 @@ int l_file_mkdir(lua_State* L) {
     return 1;    
 }
 
+int l_file_mkdirs(lua_State* L) {
+    fs::path path = resolve_path(L, lua_tostring(L, 1));
+    lua_pushboolean(L, fs::create_directories(path));
+    return 1;    
+}
+
+int l_file_read_bytes(lua_State* L) {
+    fs::path path = resolve_path(L, lua_tostring(L, 1));
+    if (fs::is_regular_file(path)) {
+        size_t length = (size_t) fs::file_size(path);
+
+        ubyte* bytes = files::read_bytes(path, length);
+
+        lua_createtable(L, length, 0);
+        int newTable = lua_gettop(L);
+
+        for(int i = 0;i < length;i++) {
+            lua_pushnumber(L, bytes[i]);
+            lua_rawseti(L, newTable, i+1);
+        }
+        return 1;
+    }
+    return luaL_error(L, "file does not exists '%s'", path.u8string().c_str());   
+}
+
+int l_file_write_bytes(lua_State* L) {
+    int pathIndex = 1;
+
+    if(!lua_isstring(L, pathIndex)) {
+        return luaL_error(L, "string expected");
+    }
+
+    fs::path path = resolve_path(L, lua_tostring(L, pathIndex));
+
+    std::vector<ubyte> bytes;
+
+    size_t len = lua_objlen(L, 2);
+
+    int bytesIndex = -1;
+
+    if(!lua_istable(L, bytesIndex)) {
+        return luaL_error(L, "table expected");
+    } else {
+        lua_pushnil(L);
+
+        bytesIndex--;
+
+        int i = 1;
+
+        while(lua_next(L, bytesIndex) != 0) {
+            if(lua_isnumber(L, -1)) {
+                const int byte = lua_tointeger(L, -1);
+
+                if(byte < 0 || byte > 255) {
+                    return luaL_error(L, "byte '%i' at index '%i' is less than 0 or greater than 255", byte, i);
+                }
+
+                bytes.push_back(byte);
+                
+                lua_pop(L, 1);
+
+                i++;
+            } else {
+                return luaL_error(L, "number expected at index '%i'", i);
+            }
+        }
+
+        lua_pushboolean(L, files::write_bytes(path, &bytes[0], len));
+        return 1;
+    }
+}
+
 /* == time library == */
 int l_time_uptime(lua_State* L) {
     lua_pushnumber(L, Window::time());
diff --git a/src/logic/scripting/lua/api_lua.h b/src/logic/scripting/lua/api_lua.h
index 27fd4c855..aecadf06e 100644
--- a/src/logic/scripting/lua/api_lua.h
+++ b/src/logic/scripting/lua/api_lua.h
@@ -13,6 +13,9 @@ extern int l_file_isfile(lua_State* L);
 extern int l_file_isdir(lua_State* L);
 extern int l_file_length(lua_State* L);
 extern int l_file_mkdir(lua_State* L);
+extern int l_file_mkdirs(lua_State* L);
+extern int l_file_read_bytes(lua_State* L);
+extern int l_file_write_bytes(lua_State* L);
 
 static const luaL_Reg filelib [] = {
     {"resolve", lua_wrap_errors<l_file_resolve>},
@@ -23,6 +26,9 @@ static const luaL_Reg filelib [] = {
     {"isdir", lua_wrap_errors<l_file_isdir>},
     {"length", lua_wrap_errors<l_file_length>},
     {"mkdir", lua_wrap_errors<l_file_mkdir>},
+    {"mkdirs", lua_wrap_errors<l_file_mkdirs>},
+    {"read_bytes", lua_wrap_errors<l_file_read_bytes>},
+    {"write_bytes", lua_wrap_errors<l_file_write_bytes>},
     {NULL, NULL}
 };