implement player spawning, movement, animation, metadata and destroying, implement NBT serialization, version 1.1.7

src/js/net/minecraft/client/world/Chunk.js

@@ -195,7 +195,7 @@ export default class Chunk {
         while (y > 0) {
             let typeId = this.getBlockAt(x, y - 1, z);
             let block = Block.getById(typeId);
-            let opacity = typeId === 0 ? 0 : block.getOpacity();
+            let opacity = typeId === 0 || block === null ? 0 : block.getOpacity();
 
             if (opacity !== 0) {
                 break;

src/js/net/minecraft/client/world/World.js

@@ -43,6 +43,11 @@ export default class World {
     }
 
     onTick() {
+        // Tick entities
+        for (let i = 0; i < this.entities.length; i++) {
+            this.entities[i].onUpdate();
+        }
+
         // Update skylight subtracted (To make the night dark)
         let lightLevel = this.calculateSkylightSubtracted(1.0);
         if (lightLevel !== this.skylightSubtracted) {
@@ -566,8 +571,10 @@ export default class World {
 
     removeEntityById(id) {
         let entity = this.getEntityById(id);
-        this.entities.remove(entity);
-        this.group.remove(entity.renderer.group);
+        if (entity !== null) {
+            this.entities.splice(this.entities.indexOf(entity), 1);
+            this.group.remove(entity.renderer.group);
+        }
     }
 
     getEntityById(id) {
@@ -602,4 +609,10 @@ export default class World {
         return this.chunkProvider;
     }
 
+    clearEntities() {
+        for (let entity of this.entities) {
+            this.removeEntityById(entity.id);
+        }
+    }
+
 }