diff --git a/luprex/cpp/core/animqueue.hpp b/luprex/cpp/core/animqueue.hpp
index 8a3e1d7f..9a20959e 100644
--- a/luprex/cpp/core/animqueue.hpp
+++ b/luprex/cpp/core/animqueue.hpp
@@ -249,6 +249,10 @@ public:
     eng::string steps_debug_string() const;
     eng::string full_debug_string() const;
 
+    // Get the final hash value.
+    //
+    uint64_t get_final_hash() const { return steps_.back().hash; }
+    
     // Get the final entry, xyz and plane only.
     //
     AnimCoreState get_final_core_state() const;
diff --git a/luprex/cpp/core/drivenengine.cpp b/luprex/cpp/core/drivenengine.cpp
index 2d3a2188..844f7b8f 100644
--- a/luprex/cpp/core/drivenengine.cpp
+++ b/luprex/cpp/core/drivenengine.cpp
@@ -414,6 +414,7 @@ uint64_t DrivenEngine::drv_get_actor_id() const {
 }
 
 void DrivenEngine::drv_get_tangibles_near(uint64_t tanid, double rx, double ry, double rz, uint32_t *count, int64_t **ids) {
+    uint32_t hash1 = eng::memhash();
     scan_result_.clear();
     if ((visible_world_ != 0) && (tanid != 0)) {
         PlaneScan scan;
@@ -430,8 +431,19 @@ void DrivenEngine::drv_get_tangibles_near(uint64_t tanid, double rx, double ry,
     } else {
         *ids = nullptr;
     }
+    uint32_t hash2 = eng::memhash();
+    assert(hash1 == hash2);
 }
 
+void DrivenEngine::drv_get_animation_queue_hashes(uint32_t count, const int64_t *ids, uint64_t *hashes) {
+    if (visible_world_ == 0) {
+        for (int i = 0; i < int(count); i++) {
+            hashes[i] = 0;
+        }
+    } else {
+        visible_world_->get_animation_queue_hashes(count, ids, hashes);
+    }
+}
 
 //////////////////////////////////////////////////////////////////////////////
 //////////////////////////////////////////////////////////////////////////////
@@ -562,6 +574,9 @@ static void drv_get_tangibles_near(EngineWrapper *w, uint64_t tanid, double rx,
     return w->engine->drv_get_tangibles_near(tanid, rx, ry, rz, count, ids);
 }
 
+static void drv_get_animation_queue_hashes(EngineWrapper *w, uint32_t count, const int64_t *ids, uint64_t *hashes) {
+    return w->engine->drv_get_animation_queue_hashes(count, ids, hashes);
+}
 
 //////////////////////////////////////////////////////////////////////////////
 //////////////////////////////////////////////////////////////////////////////
@@ -959,6 +974,7 @@ static void init_engine_wrapper_helper(EngineWrapper *w) {
     w->get_stop_driver = drv_get_stop_driver;
     w->get_actor_id = drv_get_actor_id;
     w->get_tangibles_near = drv_get_tangibles_near;
+    w->get_animation_queue_hashes = drv_get_animation_queue_hashes;
 
     w->play_initialize = play_initialize;
     w->play_clear_new_outgoing = play_clear_new_outgoing;
diff --git a/luprex/cpp/core/drivenengine.hpp b/luprex/cpp/core/drivenengine.hpp
index 882a3adc..476e2537 100644
--- a/luprex/cpp/core/drivenengine.hpp
+++ b/luprex/cpp/core/drivenengine.hpp
@@ -282,6 +282,7 @@ public:
     bool drv_get_stop_driver() const;
     uint64_t drv_get_actor_id() const;
     void drv_get_tangibles_near(uint64_t tanid, double rx, double ry, double rz, uint32_t *count, int64_t **ids);
+    void drv_get_animation_queue_hashes(uint32_t count, const int64_t *ids, uint64_t *hashes);
 
     void drv_initialize(uint32_t srcpklen, const char *srcpk, int argc, char **argv);
     void drv_clear_new_outgoing();
diff --git a/luprex/cpp/core/enginewrapper.hpp b/luprex/cpp/core/enginewrapper.hpp
index 81a1abd0..4569636d 100644
--- a/luprex/cpp/core/enginewrapper.hpp
+++ b/luprex/cpp/core/enginewrapper.hpp
@@ -114,9 +114,13 @@ struct EngineWrapper {
     //
     uint64_t (*get_actor_id)(EngineWrapper *w);
 
-    // Get the results of the last scan radius.
+    // Do a scan to find tangibles near the specified player.
     //
     void (*get_tangibles_near)(EngineWrapper *w, uint64_t tanid, double rx, double ry, double rz, uint32_t *count, int64_t **ids);
+
+    // Get the hash value of the final animation step for each tangible.
+    //
+    void (*get_animation_queue_hashes)(EngineWrapper *w, uint32_t count, const int64_t *ids, uint64_t *hashes);
     
     //////////////////////////////////////////////////////////////////////////////
     //////////////////////////////////////////////////////////////////////////////
diff --git a/luprex/cpp/core/world-core.cpp b/luprex/cpp/core/world-core.cpp
index 8a77eac0..90b89959 100644
--- a/luprex/cpp/core/world-core.cpp
+++ b/luprex/cpp/core/world-core.cpp
@@ -202,7 +202,6 @@ void World::tangible_delete(int64_t id) {
 }
 
 void World::get_near(PlaneScan &scan, util::IdVector *into) const {
-    uint32_t hash1 = eng::memhash();
     into->clear();
     // If 'near' is set, update the plane and center.
     int64_t actor_id = scan.near();
@@ -216,8 +215,6 @@ void World::get_near(PlaneScan &scan, util::IdVector *into) const {
         scan.set_center(util::XYZ(pi.x(), pi.y(), pi.z()));
     }
     plane_map_.scan(scan, into);
-    uint32_t hash2 = eng::memhash();
-    assert(hash1 == hash2);
 }
 
 void World::get_near(int64_t player_id, float radius, bool exclude_nowhere, bool omit_player, bool sorted, util::IdVector *into) const {
@@ -230,6 +227,17 @@ void World::get_near(int64_t player_id, float radius, bool exclude_nowhere, bool
     get_near(scan, into);
 }
 
+void World::get_animation_queue_hashes(uint32_t count, const int64_t *ids, uint64_t *hashes) {
+    for (int i = 0; i < int(count); i++) {
+        Tangible *tan = tangible_get(ids[i]);
+        if (tan == 0) {
+            hashes[i] = 0;
+        } else {
+            hashes[i] = tan->anim_queue_.get_final_hash();
+        }
+    }
+}
+
 World::Redirects World::fetch_redirects() {
     World::Redirects result = std::move(redirects_);
     redirects_.clear();
diff --git a/luprex/cpp/core/world.hpp b/luprex/cpp/core/world.hpp
index bb874997..8eab8edb 100644
--- a/luprex/cpp/core/world.hpp
+++ b/luprex/cpp/core/world.hpp
@@ -120,20 +120,27 @@ public:
 
     // get_near
     //
-    // Get a list of the tangibles that are near the player.  If 'exclude_nowhere' is
-    // true, exclude any tangibles on the nowhere plane (but still include the player himself).
-    // The unsorted version returns the tangibles in an unpredictable order.  If sorted
-    // is false, return them in an unpredictable order.
+    // Get a list of tangibles in any arbitrary region.
     //
-    void get_near(int64_t player_id, float radius, bool exclude_nowhere, bool omit_player, bool sorted, IdVector *into) const;
+    void get_near(PlaneScan &sc, IdVector *into) const;
 
     // get_near
     //
-    // Get a list of tangibles in any arbitrary region.  This differs from
-    // PlaneMap::scan in that if the scan specifies a 'near', then the plane
-    // and center of the scan are updated from the near tangible.
+    // Get a list of the tangibles that are near the player.  If
+    // 'exclude_nowhere' is true, exclude any tangibles on the nowhere plane
+    // (but still include the player himself). The unsorted version returns the
+    // tangibles in an unpredictable order.  If sorted is false, return them in
+    // an unpredictable order.  This is a thin wrapper around the more general
+    // form of 'get_near', above.
     //
-    void get_near(PlaneScan &sc, IdVector *into) const;
+    void get_near(int64_t player_id, float radius, bool exclude_nowhere, bool omit_player, bool sorted, IdVector *into) const;
+
+    // get animation queue hashes.
+    //
+    // This is used by the graphics engine to check if any of the specified
+    // animation queues has changed in any way.
+    //
+    void get_animation_queue_hashes(uint32_t count, const int64_t *ids, uint64_t *hashes);
 
     // Make a tangible.
     //