source/blender/render/hydra/scene_delegate/blender_scene_delegate.cc

@@ -375,8 +375,8 @@ void BlenderSceneDelegate::add_new_objects()
 
 void BlenderSceneDelegate::remove_unused_objects()
 {
-  /* Export of new visible objects which were not exported before */
-  std::set<pxr::SdfPath> available_objects;
+  /* Get available objects */
+  std::set<std::string> available_objects;
 
   DEGObjectIterSettings settings = {0};
   settings.depsgraph = depsgraph;
@@ -394,14 +394,26 @@ void BlenderSceneDelegate::remove_unused_objects()
     if (!ObjectData::supported(object)) {
       continue;
     }
-    available_objects.insert(ObjectData::prim_id(this, object));
-    available_objects.insert(InstancerData::prim_id(this, object));
+    available_objects.insert(ObjectData::prim_id(this, object).GetName());
+    available_objects.insert(InstancerData::prim_id(this, object).GetName());
   }
   ITER_END;
 
-  /* remove unused objects */
+  /* Remove unused instancers */
+  for (auto it = instancers.begin(); it != instancers.end(); ++it) {
+    if (available_objects.find(it->first.GetName()) != available_objects.end()) {
+      /* Remove objects from instancers */
+      it->second->check_remove(available_objects);
+      continue;
+    }
+    it->second->remove();
+    instancers.erase(it);
+    it = instancers.begin();
+  }
+
+  /* Remove unused objects */
   for (auto it = objects.begin(); it != objects.end(); ++it) {
-    if (available_objects.find(it->first) != available_objects.end()) {
+    if (available_objects.find(it->first.GetName()) != available_objects.end()) {
       continue;
     }
     it->second->remove();
@@ -409,7 +421,8 @@ void BlenderSceneDelegate::remove_unused_objects()
     it = objects.begin();
   }
 
-  /* remove unused materials */
+
+  /* Remove unused materials */
   std::set<pxr::SdfPath> available_materials;
   for (auto &it : objects) {
     MeshData *m_data = dynamic_cast<MeshData *>(it.second.get());
@@ -442,6 +455,32 @@ void BlenderSceneDelegate::update_visibility()
   for (auto &it : instancers) {
     it.second->update_visibility(view3d);
   }
+
+  /* Add objects which were invisible before and not added yet */
+  DEGObjectIterSettings settings = {0};
+  settings.depsgraph = depsgraph;
+  settings.flags = DEG_ITER_OBJECT_FLAG_LINKED_DIRECTLY | DEG_ITER_OBJECT_FLAG_VISIBLE |
+                   DEG_ITER_OBJECT_FLAG_LINKED_VIA_SET;
+  DEGObjectIterData data = {0};
+  data.settings = &settings;
+  data.graph = settings.depsgraph;
+  data.flag = settings.flags;
+  ITER_BEGIN (DEG_iterator_objects_begin,
+              DEG_iterator_objects_next,
+              DEG_iterator_objects_end,
+              &data,
+              Object *,
+              object) {
+
+    if (!ObjectData::supported(object)) {
+      continue;
+    }
+
+    if (!object_data(ObjectData::prim_id(this, object))) {
+      add_update_object(object);
+    }
+  }
+  ITER_END;
 }
 
 void BlenderSceneDelegate::clear()

source/blender/render/hydra/scene_delegate/instancer.cc

@@ -140,16 +140,23 @@ void InstancerData::check_update(Object *object)
   }
 }
 
-void InstancerData::check_remove(pxr::SdfPath const &obj_id)
+void InstancerData::check_remove(std::set<std::string> &available_objects)
 {
-  pxr::SdfPath path = p_id.AppendElementString(obj_id.GetName());
-  auto it = instances.find(path);
-  if (it == instances.end()) {
-    return;
+  bool ret = false;
+  for (auto it = instances.begin(); it != instances.end(); ++it) {
+    if (available_objects.find(it->first.GetName()) != available_objects.end()) {
+      continue;
+    }
+    it->second.obj_data->remove();
+    instances.erase(it);
+    it = instances.begin();
+    ret = true;
+  }
+  if (ret) {
+    set_instances();
+    scene_delegate->GetRenderIndex().GetChangeTracker().MarkInstancerDirty(p_id,
+                                                                           pxr::HdChangeTracker::AllDirty);
   }
-  set_instances();
-  scene_delegate->GetRenderIndex().GetChangeTracker().MarkInstancerDirty(
-      p_id, pxr::HdChangeTracker::AllDirty);
 }
 
 void InstancerData::available_materials(std::set<pxr::SdfPath> &paths)
@@ -218,7 +225,7 @@ void InstancerData::insert()
 
 void InstancerData::remove()
 {
-  ID_LOG(2, "");
+  CLOG_INFO(LOG_BSD, 2, "%s", p_id.GetText());
   for (auto &it : instances) {
     it.second.obj_data->remove();
   }

source/blender/render/hydra/scene_delegate/instancer.h

@@ -36,7 +36,7 @@ class InstancerData : public ObjectData {
   ObjectData *object_data(pxr::SdfPath const &id);
   pxr::SdfPathVector prototypes();
   void check_update(Object *object);
-  void check_remove(pxr::SdfPath const &obj_id);
+  void check_remove(std::set<std::string> &available_objects);
   void available_materials(std::set<pxr::SdfPath> &paths);
 
  private:

source/blender/render/hydra/scene_delegate/light.cc

@@ -160,7 +160,7 @@ void LightData::insert()
 
 void LightData::remove()
 {
-  ID_LOG(2, "");
+  CLOG_INFO(LOG_BSD, 2, "%s", p_id.GetText());
   scene_delegate->GetRenderIndex().RemoveSprim(p_type, p_id);
 }
 

source/blender/render/hydra/scene_delegate/mesh.cc

@@ -201,7 +201,7 @@ void MeshData::remove()
     return;
   }
 
-  ID_LOG(2, "");
+  CLOG_INFO(LOG_BSD, 2, "%s", p_id.GetText());
   scene_delegate->GetRenderIndex().RemoveRprim(p_id);
 }