streaming assets

world.js

@@ -123,6 +123,33 @@ export class World {
 
         if (!capturedInitialState) captureInitial();
     }
+
+    getUniqueBlockStates() {
+        const unique = new Map();
+        const add = (block) => {
+            if (!block || !block.id || block.id === 'air' || block.id === 'minecraft:air') return;
+
+            // Create a stable hash for the state object so we don't duplicate requests
+            const stateHash = Object.entries(block.state)
+                .sort((a, b) => a[0].localeCompare(b[0]))
+                .map(e => `${e[0]}=${e[1]}`)
+                .join(',');
+            const hash = `${block.id}[${stateHash}]`;
+
+            if (!unique.has(hash)) {
+                unique.set(hash, {id: block.id, state: {...block.state}});
+            }
+        };
+
+        for (const block of this.initialState.values()) add(block);
+        for (const ev of this.events) {
+            for (const action of ev.actions) {
+                add(action.prev);
+                add(action.next);
+            }
+        }
+        return Array.from(unique.values());
+    }
 }
 
 export class WorldFrame {