NPC rotations inherit building rotation.

src/engine/objects/Mob.java

@@ -929,7 +929,7 @@ public class Mob extends AbstractIntelligenceAgent {
             this.loc = new Vector3fImmutable(bindLoc);
             this.endLoc = new Vector3fImmutable(bindLoc);
 
-            // Rotate mobile's rotation by the building's rotation
+            // Rotate mobile rotation by the building's rotation
 
             slotRotation = new Quaternion().fromAngles(0, acos(this.getRot().y) * 2, 0);
             slotRotation = slotRotation.mult(building.getBounds().getQuaternion());

src/engine/objects/NPC.java

@@ -38,6 +38,7 @@ import java.util.HashSet;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
 
+import static engine.math.FastMath.acos;
 import static engine.net.client.msg.ErrorPopupMsg.sendErrorPopup;
 import static engine.objects.MobBase.loadEquipmentSet;
 
@@ -375,6 +376,12 @@ public class NPC extends AbstractCharacter {
 			slotRotation = BuildingManager.getSlotLocation(building, slot).getRotation();
 			this.setRot(new Vector3f(0, slotRotation.y, 0));
 
+			// Rotate NPC rotation by the building's rotation
+
+			slotRotation = new Quaternion().fromAngles(0, acos(this.getRot().y) * 2, 0);
+			slotRotation = slotRotation.mult(building.getBounds().getQuaternion());
+			this.setRot(new Vector3f(0, slotRotation.y, 0));
+
 			// Configure region and floor/level for this NPC
 
 			this.region = BuildingManager.GetRegion(this.building, bindLoc.x, bindLoc.y, bindLoc.z);