diff --git a/mappings/extra/occluding-states-1.13.json b/mappings/extra/occluding-states-1.13.json
new file mode 100644
index 0000000..c02774b
--- /dev/null
+++ b/mappings/extra/occluding-states-1.13.json
@@ -0,0 +1,379 @@
+[
+  "stone",
+  "granite",
+  "polished_granite",
+  "diorite",
+  "polished_diorite",
+  "andesite",
+  "polished_andesite",
+  "grass_block[snowy=false]",
+  "dirt",
+  "coarse_dirt",
+  "podzol[snowy=false]",
+  "cobblestone",
+  "oak_planks",
+  "spruce_planks",
+  "birch_planks",
+  "jungle_planks",
+  "acacia_planks",
+  "dark_oak_planks",
+  "bedrock",
+  "sand",
+  "red_sand",
+  "gravel",
+  "gold_ore",
+  "iron_ore",
+  "coal_ore",
+  "oak_log[axis=x]",
+  "oak_log[axis=y]",
+  "oak_log[axis=z]",
+  "spruce_log[axis=x]",
+  "spruce_log[axis=y]",
+  "spruce_log[axis=z]",
+  "birch_log[axis=x]",
+  "birch_log[axis=y]",
+  "birch_log[axis=z]",
+  "jungle_log[axis=x]",
+  "jungle_log[axis=y]",
+  "jungle_log[axis=z]",
+  "acacia_log[axis=x]",
+  "acacia_log[axis=y]",
+  "acacia_log[axis=z]",
+  "dark_oak_log[axis=x]",
+  "dark_oak_log[axis=y]",
+  "dark_oak_log[axis=z]",
+  "oak_wood[axis=y]",
+  "spruce_wood[axis=y]",
+  "birch_wood[axis=y]",
+  "jungle_wood[axis=y]",
+  "acacia_wood[axis=y]",
+  "dark_oak_wood[axis=y]",
+  "sponge",
+  "wet_sponge",
+  "lapis_ore",
+  "lapis_block",
+  "dispenser[facing=north,triggered=true]",
+  "dispenser[facing=north,triggered=false]",
+  "dispenser[facing=east,triggered=true]",
+  "dispenser[facing=east,triggered=false]",
+  "dispenser[facing=south,triggered=true]",
+  "dispenser[facing=south,triggered=false]",
+  "dispenser[facing=west,triggered=true]",
+  "dispenser[facing=west,triggered=false]",
+  "dispenser[facing=up,triggered=true]",
+  "dispenser[facing=up,triggered=false]",
+  "dispenser[facing=down,triggered=true]",
+  "dispenser[facing=down,triggered=false]",
+  "sandstone",
+  "chiseled_sandstone",
+  "cut_sandstone",
+  "note_block[instrument=harp,note=0,powered=false]",
+  "white_wool",
+  "orange_wool",
+  "magenta_wool",
+  "light_blue_wool",
+  "yellow_wool",
+  "lime_wool",
+  "pink_wool",
+  "gray_wool",
+  "light_gray_wool",
+  "cyan_wool",
+  "purple_wool",
+  "blue_wool",
+  "brown_wool",
+  "green_wool",
+  "red_wool",
+  "black_wool",
+  "gold_block",
+  "iron_block",
+  "bricks",
+  "bookshelf",
+  "mossy_cobblestone",
+  "obsidian",
+  "spawner",
+  "diamond_ore",
+  "diamond_block",
+  "crafting_table",
+  "furnace[facing=north,lit=true]",
+  "furnace[facing=north,lit=false]",
+  "furnace[facing=south,lit=true]",
+  "furnace[facing=south,lit=false]",
+  "furnace[facing=west,lit=true]",
+  "furnace[facing=west,lit=false]",
+  "furnace[facing=east,lit=true]",
+  "furnace[facing=east,lit=false]",
+  "redstone_ore[lit=true]",
+  "redstone_ore[lit=false]",
+  "snow_block",
+  "clay",
+  "jukebox[has_record=true]",
+  "jukebox[has_record=false]",
+  "netherrack",
+  "soul_sand",
+  "carved_pumpkin[facing=north]",
+  "carved_pumpkin[facing=south]",
+  "carved_pumpkin[facing=west]",
+  "carved_pumpkin[facing=east]",
+  "jack_o_lantern[facing=north]",
+  "jack_o_lantern[facing=south]",
+  "jack_o_lantern[facing=west]",
+  "jack_o_lantern[facing=east]",
+  "infested_stone",
+  "infested_cobblestone",
+  "infested_stone_bricks",
+  "infested_mossy_stone_bricks",
+  "infested_cracked_stone_bricks",
+  "infested_chiseled_stone_bricks",
+  "stone_bricks",
+  "mossy_stone_bricks",
+  "cracked_stone_bricks",
+  "chiseled_stone_bricks",
+  "brown_mushroom_block[down=true,east=true,north=true,south=true,up=true,west=true]",
+  "brown_mushroom_block[down=false,east=true,north=true,south=false,up=true,west=false]",
+  "brown_mushroom_block[down=false,east=true,north=false,south=true,up=true,west=false]",
+  "brown_mushroom_block[down=false,east=true,north=false,south=false,up=true,west=false]",
+  "brown_mushroom_block[down=false,east=false,north=true,south=false,up=true,west=true]",
+  "brown_mushroom_block[down=false,east=false,north=true,south=false,up=true,west=false]",
+  "brown_mushroom_block[down=false,east=false,north=false,south=true,up=true,west=true]",
+  "brown_mushroom_block[down=false,east=false,north=false,south=true,up=true,west=false]",
+  "brown_mushroom_block[down=false,east=false,north=false,south=false,up=true,west=true]",
+  "brown_mushroom_block[down=false,east=false,north=false,south=false,up=true,west=false]",
+  "brown_mushroom_block[down=false,east=false,north=false,south=false,up=false,west=false]",
+  "red_mushroom_block[down=true,east=true,north=true,south=true,up=true,west=true]",
+  "red_mushroom_block[down=false,east=true,north=true,south=false,up=true,west=false]",
+  "red_mushroom_block[down=false,east=true,north=false,south=true,up=true,west=false]",
+  "red_mushroom_block[down=false,east=true,north=false,south=false,up=true,west=false]",
+  "red_mushroom_block[down=false,east=false,north=true,south=false,up=true,west=true]",
+  "red_mushroom_block[down=false,east=false,north=true,south=false,up=true,west=false]",
+  "red_mushroom_block[down=false,east=false,north=false,south=true,up=true,west=true]",
+  "red_mushroom_block[down=false,east=false,north=false,south=true,up=true,west=false]",
+  "red_mushroom_block[down=false,east=false,north=false,south=false,up=true,west=true]",
+  "red_mushroom_block[down=false,east=false,north=false,south=false,up=true,west=false]",
+  "red_mushroom_block[down=false,east=false,north=false,south=false,up=false,west=false]",
+  "mushroom_stem[down=true,east=true,north=true,south=true,up=true,west=true]",
+  "mushroom_stem[down=false,east=true,north=true,south=true,up=false,west=true]",
+  "melon",
+  "mycelium[snowy=false]",
+  "nether_bricks",
+  "end_stone",
+  "redstone_lamp[lit=true]",
+  "redstone_lamp[lit=false]",
+  "emerald_ore",
+  "emerald_block",
+  "command_block[conditional=true,facing=north]",
+  "command_block[conditional=true,facing=east]",
+  "command_block[conditional=true,facing=south]",
+  "command_block[conditional=true,facing=west]",
+  "command_block[conditional=true,facing=up]",
+  "command_block[conditional=true,facing=down]",
+  "command_block[conditional=false,facing=north]",
+  "command_block[conditional=false,facing=east]",
+  "command_block[conditional=false,facing=south]",
+  "command_block[conditional=false,facing=west]",
+  "command_block[conditional=false,facing=up]",
+  "command_block[conditional=false,facing=down]",
+  "nether_quartz_ore",
+  "quartz_block",
+  "chiseled_quartz_block",
+  "quartz_pillar[axis=x]",
+  "quartz_pillar[axis=y]",
+  "quartz_pillar[axis=z]",
+  "dropper[facing=north,triggered=true]",
+  "dropper[facing=north,triggered=false]",
+  "dropper[facing=east,triggered=true]",
+  "dropper[facing=east,triggered=false]",
+  "dropper[facing=south,triggered=true]",
+  "dropper[facing=south,triggered=false]",
+  "dropper[facing=west,triggered=true]",
+  "dropper[facing=west,triggered=false]",
+  "dropper[facing=up,triggered=true]",
+  "dropper[facing=up,triggered=false]",
+  "dropper[facing=down,triggered=true]",
+  "dropper[facing=down,triggered=false]",
+  "white_terracotta",
+  "orange_terracotta",
+  "magenta_terracotta",
+  "light_blue_terracotta",
+  "yellow_terracotta",
+  "lime_terracotta",
+  "pink_terracotta",
+  "gray_terracotta",
+  "light_gray_terracotta",
+  "cyan_terracotta",
+  "purple_terracotta",
+  "blue_terracotta",
+  "brown_terracotta",
+  "green_terracotta",
+  "red_terracotta",
+  "black_terracotta",
+  "slime_block",
+  "barrier",
+  "prismarine",
+  "prismarine_bricks",
+  "dark_prismarine",
+  "hay_block[axis=x]",
+  "hay_block[axis=y]",
+  "hay_block[axis=z]",
+  "terracotta",
+  "coal_block",
+  "packed_ice",
+  "red_sandstone",
+  "chiseled_red_sandstone",
+  "cut_red_sandstone",
+  "oak_slab[type=double,waterlogged=false]",
+  "spruce_slab[type=double,waterlogged=false]",
+  "birch_slab[type=double,waterlogged=false]",
+  "jungle_slab[type=double,waterlogged=false]",
+  "acacia_slab[type=double,waterlogged=false]",
+  "dark_oak_slab[type=double,waterlogged=false]",
+  "stone_slab[type=double,waterlogged=false]",
+  "sandstone_slab[type=double,waterlogged=false]",
+  "petrified_oak_slab[type=double,waterlogged=false]",
+  "cobblestone_slab[type=double,waterlogged=false]",
+  "brick_slab[type=double,waterlogged=false]",
+  "stone_brick_slab[type=double,waterlogged=false]",
+  "nether_brick_slab[type=double,waterlogged=false]",
+  "quartz_slab[type=double,waterlogged=false]",
+  "red_sandstone_slab[type=double,waterlogged=false]",
+  "purpur_slab[type=double,waterlogged=false]",
+  "smooth_stone",
+  "smooth_sandstone",
+  "smooth_quartz",
+  "smooth_red_sandstone",
+  "purpur_block",
+  "purpur_pillar[axis=x]",
+  "purpur_pillar[axis=y]",
+  "purpur_pillar[axis=z]",
+  "end_stone_bricks",
+  "repeating_command_block[conditional=true,facing=north]",
+  "repeating_command_block[conditional=true,facing=east]",
+  "repeating_command_block[conditional=true,facing=south]",
+  "repeating_command_block[conditional=true,facing=west]",
+  "repeating_command_block[conditional=true,facing=up]",
+  "repeating_command_block[conditional=true,facing=down]",
+  "repeating_command_block[conditional=false,facing=north]",
+  "repeating_command_block[conditional=false,facing=east]",
+  "repeating_command_block[conditional=false,facing=south]",
+  "repeating_command_block[conditional=false,facing=west]",
+  "repeating_command_block[conditional=false,facing=up]",
+  "repeating_command_block[conditional=false,facing=down]",
+  "chain_command_block[conditional=true,facing=north]",
+  "chain_command_block[conditional=true,facing=east]",
+  "chain_command_block[conditional=true,facing=south]",
+  "chain_command_block[conditional=true,facing=west]",
+  "chain_command_block[conditional=true,facing=up]",
+  "chain_command_block[conditional=true,facing=down]",
+  "chain_command_block[conditional=false,facing=north]",
+  "chain_command_block[conditional=false,facing=east]",
+  "chain_command_block[conditional=false,facing=south]",
+  "chain_command_block[conditional=false,facing=west]",
+  "chain_command_block[conditional=false,facing=up]",
+  "chain_command_block[conditional=false,facing=down]",
+  "magma_block",
+  "nether_wart_block",
+  "red_nether_bricks",
+  "bone_block[axis=x]",
+  "bone_block[axis=y]",
+  "bone_block[axis=z]",
+  "white_glazed_terracotta[facing=north]",
+  "white_glazed_terracotta[facing=south]",
+  "white_glazed_terracotta[facing=west]",
+  "white_glazed_terracotta[facing=east]",
+  "orange_glazed_terracotta[facing=north]",
+  "orange_glazed_terracotta[facing=south]",
+  "orange_glazed_terracotta[facing=west]",
+  "orange_glazed_terracotta[facing=east]",
+  "magenta_glazed_terracotta[facing=north]",
+  "magenta_glazed_terracotta[facing=south]",
+  "magenta_glazed_terracotta[facing=west]",
+  "magenta_glazed_terracotta[facing=east]",
+  "light_blue_glazed_terracotta[facing=north]",
+  "light_blue_glazed_terracotta[facing=south]",
+  "light_blue_glazed_terracotta[facing=west]",
+  "light_blue_glazed_terracotta[facing=east]",
+  "yellow_glazed_terracotta[facing=north]",
+  "yellow_glazed_terracotta[facing=south]",
+  "yellow_glazed_terracotta[facing=west]",
+  "yellow_glazed_terracotta[facing=east]",
+  "lime_glazed_terracotta[facing=north]",
+  "lime_glazed_terracotta[facing=south]",
+  "lime_glazed_terracotta[facing=west]",
+  "lime_glazed_terracotta[facing=east]",
+  "pink_glazed_terracotta[facing=north]",
+  "pink_glazed_terracotta[facing=south]",
+  "pink_glazed_terracotta[facing=west]",
+  "pink_glazed_terracotta[facing=east]",
+  "gray_glazed_terracotta[facing=north]",
+  "gray_glazed_terracotta[facing=south]",
+  "gray_glazed_terracotta[facing=west]",
+  "gray_glazed_terracotta[facing=east]",
+  "light_gray_glazed_terracotta[facing=north]",
+  "light_gray_glazed_terracotta[facing=south]",
+  "light_gray_glazed_terracotta[facing=west]",
+  "light_gray_glazed_terracotta[facing=east]",
+  "cyan_glazed_terracotta[facing=north]",
+  "cyan_glazed_terracotta[facing=south]",
+  "cyan_glazed_terracotta[facing=west]",
+  "cyan_glazed_terracotta[facing=east]",
+  "purple_glazed_terracotta[facing=north]",
+  "purple_glazed_terracotta[facing=south]",
+  "purple_glazed_terracotta[facing=west]",
+  "purple_glazed_terracotta[facing=east]",
+  "blue_glazed_terracotta[facing=north]",
+  "blue_glazed_terracotta[facing=south]",
+  "blue_glazed_terracotta[facing=west]",
+  "blue_glazed_terracotta[facing=east]",
+  "brown_glazed_terracotta[facing=north]",
+  "brown_glazed_terracotta[facing=south]",
+  "brown_glazed_terracotta[facing=west]",
+  "brown_glazed_terracotta[facing=east]",
+  "green_glazed_terracotta[facing=north]",
+  "green_glazed_terracotta[facing=south]",
+  "green_glazed_terracotta[facing=west]",
+  "green_glazed_terracotta[facing=east]",
+  "red_glazed_terracotta[facing=north]",
+  "red_glazed_terracotta[facing=south]",
+  "red_glazed_terracotta[facing=west]",
+  "red_glazed_terracotta[facing=east]",
+  "black_glazed_terracotta[facing=north]",
+  "black_glazed_terracotta[facing=south]",
+  "black_glazed_terracotta[facing=west]",
+  "black_glazed_terracotta[facing=east]",
+  "white_concrete",
+  "orange_concrete",
+  "magenta_concrete",
+  "light_blue_concrete",
+  "yellow_concrete",
+  "lime_concrete",
+  "pink_concrete",
+  "gray_concrete",
+  "light_gray_concrete",
+  "cyan_concrete",
+  "purple_concrete",
+  "blue_concrete",
+  "brown_concrete",
+  "green_concrete",
+  "red_concrete",
+  "black_concrete",
+  "white_concrete_powder",
+  "orange_concrete_powder",
+  "magenta_concrete_powder",
+  "light_blue_concrete_powder",
+  "yellow_concrete_powder",
+  "lime_concrete_powder",
+  "pink_concrete_powder",
+  "gray_concrete_powder",
+  "light_gray_concrete_powder",
+  "cyan_concrete_powder",
+  "purple_concrete_powder",
+  "blue_concrete_powder",
+  "brown_concrete_powder",
+  "green_concrete_powder",
+  "red_concrete_powder",
+  "black_concrete_powder",
+  "structure_block[mode=save]",
+  "structure_block[mode=load]",
+  "structure_block[mode=corner]",
+  "structure_block[mode=data]",
+  "glowstone"
+]
\ No newline at end of file
diff --git a/src/main/java/com/viaversion/mappingsgenerator/MappingsLoader.java b/src/main/java/com/viaversion/mappingsgenerator/MappingsLoader.java
index 4fcc249..3117661 100644
--- a/src/main/java/com/viaversion/mappingsgenerator/MappingsLoader.java
+++ b/src/main/java/com/viaversion/mappingsgenerator/MappingsLoader.java
@@ -42,9 +42,12 @@ public final class MappingsLoader {
     public static final Logger LOGGER = LoggerFactory.getLogger(MappingsLoader.class.getSimpleName());
     private static final Gson GSON = new GsonBuilder().disableHtmlEscaping().create();
 
-
     public static @Nullable JsonObject load(final String name) throws IOException {
-        return load(MappingsOptimizer.MAPPINGS_DIR, name);
+        return load(name, JsonObject.class);
+    }
+
+    public static <T> @Nullable T load(final String name, final Class<T> outputClass) throws IOException {
+        return load(MappingsOptimizer.MAPPINGS_DIR, name, outputClass);
     }
 
     /**
@@ -55,13 +58,17 @@ public final class MappingsLoader {
      * @return the mappings file as a JsonObject, or null if it does not exist
      */
     public static @Nullable JsonObject load(final Path mappingsDir, final String name) throws IOException {
+        return load(mappingsDir, name, JsonObject.class);
+    }
+
+    public static <T> @Nullable T load(final Path mappingsDir, final String name, final Class<T> outputClass) throws IOException {
         final Path path = mappingsDir.resolve(name);
         if (!Files.exists(path)) {
             return null;
         }
 
         try (final BufferedReader reader = Files.newBufferedReader(path)) {
-            return GSON.fromJson(reader, JsonObject.class);
+            return GSON.fromJson(reader, outputClass);
         }
     }
 
diff --git a/src/main/java/com/viaversion/mappingsgenerator/extra/BlockConnections.java b/src/main/java/com/viaversion/mappingsgenerator/extra/BlockConnections.java
index 7b781ae..866e75a 100644
--- a/src/main/java/com/viaversion/mappingsgenerator/extra/BlockConnections.java
+++ b/src/main/java/com/viaversion/mappingsgenerator/extra/BlockConnections.java
@@ -32,6 +32,7 @@ import it.unimi.dsi.fastutil.ints.IntArrayList;
 import it.unimi.dsi.fastutil.ints.IntList;
 import it.unimi.dsi.fastutil.objects.Object2IntMap;
 import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap;
+import java.io.IOException;
 import java.util.List;
 import java.util.Map;
 
@@ -114,9 +115,25 @@ public final class BlockConnections {
             }
         }
 
+        addOccludingBlockStates(tag, statesMap);
         MappingsOptimizer.write(tag, MappingsOptimizer.OUTPUT_DIR.resolve("extra/blockConnections.nbt"));
     }
 
+    private static void addOccludingBlockStates(final CompoundTag tag, final Object2IntMap<String> statesMap) throws IOException {
+        final JsonArray states = MappingsLoader.load("extra/occluding-states-1.13.json", JsonArray.class);
+        final int[] value = new int[states.size()];
+        int i = 0;
+        for (final JsonElement stateElement : states) {
+            final String state = stateElement.getAsString();
+            final int id = statesMap.getInt(state);
+            if (id == -1) {
+                throw new IllegalArgumentException("Invalid occluding state " + state);
+            }
+            value[i++] = id;
+        }
+        tag.put("occluding-states", new IntArrayTag(value));
+    }
+
     private static byte connectionTypeToId(final String type) {
         final byte id = (byte) CONNECTION_TYPES.indexOf(type);
         if (id == -1) {