видно новых игроков и их передвижения

core/src/main/java/mc/core/Location.java

@@ -7,8 +7,8 @@ package mc.core;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 
-@Data
 @AllArgsConstructor
+@Data
 public class Location {
     private double x, y, z;
 
@@ -16,6 +16,20 @@ public class Location {
         return new Location(location.x, location.y, location.z);
     }
 
+    public void set(Location location) {
+        this.x = location.x;
+        this.y = location.y;
+        this.z = location.z;
+    }
+
+    public Location diff(Location location) {
+        return new Location(
+                this.x - location.x,
+                this.y - location.y,
+                this.z - location.z
+        );
+    }
+
     public int getBlockX() {
         return (int) x;
     }

core/src/main/java/mc/core/network/BroadcastNetChannel.java

@@ -32,4 +32,14 @@ public class BroadcastNetChannel implements NetChannel {
     public void writeAndFlush(final SCPacket pkt) {
         playerStream.forEach(player -> player.getChannel().writeAndFlush(pkt));
     }
+
+    @Override
+    public void write(SCPacket pkt) {
+        playerStream.forEach(player -> player.getChannel().write(pkt));
+    }
+
+    @Override
+    public void flush() {
+        playerStream.forEach(player -> player.getChannel().flush());
+    }
 }

core/src/main/java/mc/core/network/NetChannel.java

@@ -10,4 +10,6 @@ public interface NetChannel {
     void sendChatMessage(String message);
 
     void writeAndFlush(SCPacket pkt);
+    void write(SCPacket pkt);
+    void flush();
 }

core/src/main/java/mc/core/player/Look.java

@@ -15,4 +15,9 @@ public class Look {
     public static Look copy(Look look) {
         return new Look(look.yaw, look.pitch);
     }
+
+    public void set(Look look) {
+        this.yaw = look.yaw;
+        this.pitch = look.pitch;
+    }
 }