diff --git a/Kernel/src/renderive/renderable/base/Renderable_Base.cpp b/Kernel/src/renderive/renderable/base/Renderable_Base.cpp
index ea11419..a8c7686 100644
--- a/Kernel/src/renderive/renderable/base/Renderable_Base.cpp
+++ b/Kernel/src/renderive/renderable/base/Renderable_Base.cpp
@@ -141,26 +141,16 @@ void Renderable_Base::Impl::set_configuration(
     if (previous == value) return;
     configuration.store(value, std::memory_order_release);
     invalidate_prepare();
-    notify_scene_model_dirty();
 }
 void Renderable_Base::Impl::set_visible(bool value) {
     if (visible.exchange(value, std::memory_order_acq_rel) == value) return;
     invalidate_prepare();
-    notify_scene_model_dirty();
 }
 void Renderable_Base::Impl::discard_stale_frame_on_latest_data_update(
     bool enabled) noexcept {
     real_time_data_state->discard_stale_frame_on_latest_data_update.store(
         enabled, std::memory_order_release);
 }
-void Renderable_Base::Impl::notify_scene_model_dirty() {
-    const auto& state = real_time_data_state;
-    if (!state->attached.load(std::memory_order_acquire) ||
-        !state->scene_lifetime)
-        return;
-    auto lease = state->scene_lifetime->acquire();
-    if (lease) lease.scene().notify_model_dirty();
-}
 void Renderable_Base::Impl::build_prepare_graph(
     Renderable_Graph_Builder& builder) {
     builder.emplace("prepare", "Prepare",
@@ -251,11 +241,9 @@ void Renderable_Base::discard_stale_frame_on_latest_data_update(
 }
 void Renderable_Base::Impl::changed() {
     invalidate_prepare();
-    notify_scene_model_dirty();
 }
 void Renderable_Base::Impl::paint_changed() {
     invalidate_paint();
-    notify_scene_model_dirty();
 }
 void Renderable_Base::Impl::render_graph_changed() {
     rebuild_render_graph();
diff --git a/Kernel/src/renderive/renderable/base/Renderable_Base_p.hpp b/Kernel/src/renderive/renderable/base/Renderable_Base_p.hpp
index 6f04dcd..f886551 100644
--- a/Kernel/src/renderive/renderable/base/Renderable_Base_p.hpp
+++ b/Kernel/src/renderive/renderable/base/Renderable_Base_p.hpp
@@ -39,7 +39,6 @@ public:
     [[nodiscard]] static Render_State_View render_state_view() noexcept;
     [[nodiscard]] Real_Time_Data_Binding bind_real_time_data(
         Real_Time_Data_Base& data);
-    void notify_scene_model_dirty();
     void bind_scene(std::shared_ptr<Scene_Lifetime> lifetime);
     [[nodiscard]] std::shared_ptr<const Renderable_Graph> render_graph_snapshot();
     void mark_prepared(std::uint64_t revision) noexcept;
diff --git a/Kernel/src/renderive/scene/base/Scene_Base.cpp b/Kernel/src/renderive/scene/base/Scene_Base.cpp
index 9c40f9b..c75911d 100644
--- a/Kernel/src/renderive/scene/base/Scene_Base.cpp
+++ b/Kernel/src/renderive/scene/base/Scene_Base.cpp
@@ -224,8 +224,7 @@ struct Scene_Base::Impl::Compiled_Render_Plan {
 };
 class Scene_Base::Impl::Renderable_Edit_Transaction {
 public:
-    explicit Renderable_Edit_Transaction(Impl& scene) : scene_(scene), dependency_(scene.dependency_resolver_.resolve()),
-                                                        model_dirty_(scene.model_dirty_.load(std::memory_order_acquire)) {
+    explicit Renderable_Edit_Transaction(Impl& scene) : scene_(scene), dependency_(scene.dependency_resolver_.resolve()) {
         renderables_.reserve(scene.renderables_.size());
         color_caches_.reserve(scene.color_caches_.size());
         for (const auto& [id, renderable] : scene.renderables_) {
@@ -262,7 +261,6 @@ public:
             data.real_time_data_state->attached.store(state.attached, std::memory_order_release);
             data.prepare_revision.store(state.prepare_revision, std::memory_order_release);
         }
-        scene_.model_dirty_.store(model_dirty_, std::memory_order_release);
     }
 private:
     struct Renderable_State {
@@ -277,7 +275,6 @@ private:
     std::optional<renderive::scene::dependency::Resolution<Renderable_Id>> display_;
     std::vector<std::pair<Renderable_Id, std::shared_ptr<Color_Cache>>> color_caches_;
     std::vector<Renderable_State> renderable_states_;
-    bool model_dirty_{};
 };
 Scene_Base::Impl::Impl(std::pmr::memory_resource& upstream_memory_resource) : memory_domain_(std::allocate_shared<Scene_Memory_Domain>(
                                                                                   std::pmr::polymorphic_allocator<Scene_Memory_Domain>(
@@ -415,7 +412,6 @@ Scene_Edit_Error Scene_Base::Renderable_Editor::attach(Renderable renderable) {
     }
     renderable_data.real_time_data_state->attached.store(true, std::memory_order_release);
     renderable_data.invalidate_prepare();
-    scene_data.model_dirty_.store(true, std::memory_order_release);
     return Scene_Edit_Error::none;
 }
 Scene_Edit_Error Scene_Base::Renderable_Editor::detach(
@@ -432,7 +428,6 @@ Scene_Edit_Error Scene_Base::Renderable_Editor::detach(
     renderable_data.real_time_data_state->attached.store(false, std::memory_order_release);
     scene_data.color_caches_.erase(id);
     scene_data.renderables_.erase(id);
-    scene_data.model_dirty_.store(true, std::memory_order_release);
     return Scene_Edit_Error::none;
 }
 Scene_Edit_Error Scene_Base::Renderable_Editor::set_dependency_parent(
@@ -453,7 +448,6 @@ Scene_Edit_Error Scene_Base::Renderable_Editor::set_dependency_parent(
     if (!result) return fail(relationship_error(result.error, false));
     if (!result.changed) return Scene_Edit_Error::none;
     child->d_func().invalidate_prepare();
-    scene_data.model_dirty_.store(true, std::memory_order_release);
     return Scene_Edit_Error::none;
 }
 Scene_Edit_Error Scene_Base::Renderable_Editor::add_dependency_parent(
@@ -474,7 +468,6 @@ Scene_Edit_Error Scene_Base::Renderable_Editor::add_dependency_parent(
     if (!result) return fail(relationship_error(result.error, false));
     if (!result.changed) return Scene_Edit_Error::none;
     child->d_func().invalidate_prepare();
-    scene_data.model_dirty_.store(true, std::memory_order_release);
     return Scene_Edit_Error::none;
 }
 Scene_Edit_Error Scene_Base::Renderable_Editor::clear_dependency_parent(
@@ -491,7 +484,6 @@ Scene_Edit_Error Scene_Base::Renderable_Editor::clear_dependency_parent(
     if (!result) return fail(relationship_error(result.error, false));
     if (!result.changed) return Scene_Edit_Error::none;
     child->d_func().invalidate_prepare();
-    scene_data.model_dirty_.store(true, std::memory_order_release);
     return Scene_Edit_Error::none;
 }
 void Scene_Base::Renderable_Editor::replace_frame_control_strategy(
@@ -602,7 +594,6 @@ Scene_Edit_Error Scene_2D_Base::Impl::set_display_parent_locked(
     const auto result = display_resolver_.replace_parents(
         child->renderable_id(), {parent->renderable_id()});
     if (!result) return relationship_error(result.error, true);
-    if (result.changed) model_dirty_.store(true, std::memory_order_release);
     return Scene_Edit_Error::none;
 }
 Scene_Edit_Error Scene_2D_Base::Impl::add_display_parent_locked(
@@ -618,7 +609,6 @@ Scene_Edit_Error Scene_2D_Base::Impl::add_display_parent_locked(
     const auto result = display_resolver_.add_parent(
         child->renderable_id(), parent->renderable_id());
     if (!result) return relationship_error(result.error, true);
-    if (result.changed) model_dirty_.store(true, std::memory_order_release);
     return Scene_Edit_Error::none;
 }
 Scene_Edit_Error Scene_2D_Base::Impl::clear_display_parent_locked(
@@ -629,7 +619,6 @@ Scene_Edit_Error Scene_2D_Base::Impl::clear_display_parent_locked(
     if (!is_renderable_attached_locked(child)) return Scene_Edit_Error::renderable_not_attached;
     const auto result = display_resolver_.clear_parents(child->renderable_id());
     if (!result) return relationship_error(result.error, true);
-    if (result.changed) model_dirty_.store(true, std::memory_order_release);
     return Scene_Edit_Error::none;
 }
 Scene_3D_Base::Scene_3D_Base() : Scene_3D_Base(*std::pmr::get_default_resource()) {}
@@ -922,7 +911,6 @@ void Scene_Base::Impl::request_render_graph_rebuild(
     if (renderable_scene_error(renderable) != Scene_Edit_Error::none) ::renderive::error::unexpected<std::logic_error>("attached renderable scene invariant violated");
     if (active_renderable_edit_scene_ == owner_) {
         renderable_data.reset_render_graph();
-        model_dirty_.store(true, std::memory_order_release);
         return;
     }
     Renderable owner;
@@ -936,13 +924,11 @@ void Scene_Base::Impl::request_render_graph_rebuild(
         std::lock_guard<std::recursive_mutex> lock(task_mutex_);
         if (!runtime_started_) {
             owner->d_func().reset_render_graph();
-            model_dirty_.store(true, std::memory_order_release);
             return;
         }
     }
     static_cast<void>(enqueue_renderable_edit([owner = std::move(owner)] {
         owner->d_func().reset_render_graph();
-        owner->d_func().notify_scene_model_dirty();
         return Scene_Edit_Error::none;
     }));
 }
@@ -1016,16 +1002,12 @@ void Scene_Base::Impl::publish_frame_state_locked() {
     }
     publish_observation();
 }
-void Scene_Base::notify_model_dirty() noexcept {
-    d_func().model_dirty_.store(true, std::memory_order_release);
-}
 void Scene_Base::Impl::invalidate_renderables() {
     std::lock_guard lock(model_mutex_);
     for (const auto& [id, renderable] : renderables_) {
         static_cast<void>(id);
         renderable->d_func().invalidate_prepare();
     }
-    model_dirty_.store(true, std::memory_order_release);
 }
 std::size_t Scene_Base::renderable_count() const {
     const auto& implementation = d_func();
@@ -1294,9 +1276,6 @@ std::unique_lock<std::recursive_mutex> Scene_Base::Impl::lock_render_idle() {
 bool Scene_Base::Impl::is_render_execution_context() const noexcept {
     return active_execution_scene_ == owner_;
 }
-bool Scene_Base::Impl::consume_model_dirty() noexcept {
-    return model_dirty_.exchange(false, std::memory_order_acq_rel);
-}
 void Scene_Base::Impl::shutdown() {
     std::shared_ptr<Compiled_Render_Plan> compiled_plan;
     {
diff --git a/Kernel/src/renderive/scene/base/Scene_Base.hpp b/Kernel/src/renderive/scene/base/Scene_Base.hpp
index ea20070..92eafb0 100644
--- a/Kernel/src/renderive/scene/base/Scene_Base.hpp
+++ b/Kernel/src/renderive/scene/base/Scene_Base.hpp
@@ -158,7 +158,6 @@ public:
     Scene_Render_Result wait_for_render();
     void publish_frame_state();
     void publish_frame_state(Abstract_Frame& frame);
-    void notify_model_dirty() noexcept;
     [[nodiscard]] Edit_Operation edit_renderables(Renderable_Edit edit);
     [[nodiscard]] std::size_t renderable_count() const;
     [[nodiscard]] Topology_Snapshot topology_snapshot() const;
diff --git a/Kernel/src/renderive/scene/base/Scene_Base.inl b/Kernel/src/renderive/scene/base/Scene_Base.inl
index 05d65bb..2040fa1 100644
--- a/Kernel/src/renderive/scene/base/Scene_Base.inl
+++ b/Kernel/src/renderive/scene/base/Scene_Base.inl
@@ -119,7 +119,6 @@ public:
     [[nodiscard]] Scene_Edit_Error cleanup_detached_topology_locked();
     [[nodiscard]] std::unique_lock<std::recursive_mutex> lock_render_idle();
     [[nodiscard]] bool is_render_execution_context() const noexcept;
-    [[nodiscard]] bool consume_model_dirty() noexcept;
     void invalidate_renderables();
     void shutdown();
     [[nodiscard]] Scene_Base::Edit_Operation enqueue_renderable_edit(
@@ -131,7 +130,6 @@ public:
     std::shared_ptr<Scene_Lifetime> scene_lifetime_;
     std::shared_ptr<Scene_Memory_Domain> memory_domain_;
     std::unique_ptr<Execution_Context> execution_context_;
-    std::atomic_bool model_dirty_{true};
     std::pmr::unordered_map<Renderable_Id, Renderable> renderables_;
     renderive::scene::dependency::Dependency_Resolver<Renderable_Id>
     dependency_resolver_;
diff --git a/Qt/plot/Explicit_Plot.cpp b/Qt/plot/Explicit_Plot.cpp
index 8f3409f..6da7b7f 100644
--- a/Qt/plot/Explicit_Plot.cpp
+++ b/Qt/plot/Explicit_Plot.cpp
@@ -8,7 +8,7 @@ Explicit_Plot::Explicit_Plot()
     : Abs_Plot(new Abs_Plot_Private(false)) {}
 
 Render_Ticket Explicit_Plot::replot() {
-    const auto result = d->scene->render_frame(true);
+    const auto result = d->scene->render_frame();
     return {result && *result == Plot_Render_Status::rendered};
 }
 
diff --git a/render_2D/render_2D/plottable/Performance_Overlay.h b/render_2D/render_2D/plottable/Performance_Overlay.h
index 3cddabb..f834f64 100644
--- a/render_2D/render_2D/plottable/Performance_Overlay.h
+++ b/render_2D/render_2D/plottable/Performance_Overlay.h
@@ -72,7 +72,6 @@ inline std::shared_ptr<Performance_Overlay> attach_performance_overlay(Render_Sc
 inline std::shared_ptr<Performance_Overlay> attach_performance_overlay(Render_Scene_2D& scene, const Performance_Overlay_Options& options) {
     if (auto existing = scene.performance_overlay()) {
         existing->set_options(options);
-        scene.request_redraw();
         return existing;
     }
     auto overlay = std::make_shared<Performance_Overlay>(options);
@@ -83,13 +82,11 @@ inline void set_performance_plot_name(Render_Scene_2D& scene, std::string name)
     auto overlay = scene.performance_overlay();
     if (!overlay) overlay = attach_performance_overlay(scene);
     overlay->set_plot_name(std::move(name));
-    scene.request_redraw();
 }
 inline void set_performance_overlay_enabled(Render_Scene_2D& scene, bool enabled) {
     auto overlay = scene.performance_overlay();
     if (!overlay && !enabled) return;
     if (!overlay) overlay = attach_performance_overlay(scene);
     overlay->set_enabled(enabled);
-    scene.request_redraw();
 }
 } // namespace renderive
diff --git a/render_2D/render_2D/scene/Render_Scene_2D.cpp b/render_2D/render_2D/scene/Render_Scene_2D.cpp
index 7a45a51..9013849 100644
--- a/render_2D/render_2D/scene/Render_Scene_2D.cpp
+++ b/render_2D/render_2D/scene/Render_Scene_2D.cpp
@@ -80,7 +80,6 @@ struct detail::Render_Scene_2D::Impl
             });
         const auto published = scene_state.published_state();
         if (pending.viewport != published.viewport) invalidate_renderables();
-        else if (pending != published) scene().notify_model_dirty();
     }
     void swap_scene_state() override {
         scene_state.publish();
@@ -154,17 +153,15 @@ void detail::Render_Scene_2D::dispatch_event(const Event& event) {
         }
     }
 }
-auto detail::Render_Scene_2D::render_frame(bool force) -> Expected<Plot_Render_Status, Plot_Render_Frame_Error> {
-    if (!view_active() && !force) return Plot_Render_Status::view_inactive;
+auto detail::Render_Scene_2D::render_frame() -> Expected<Plot_Render_Status, Plot_Render_Frame_Error> {
+    if (!view_active()) return Plot_Render_Status::view_inactive;
     const Size viewport = get<&State::viewport>();
     if (viewport.empty()) return Plot_Render_Status::empty_viewport;
-    if (!d_func<Impl>().consume_model_dirty() && !force) return Plot_Render_Status::model_unchanged;
     const auto started = std::chrono::steady_clock::now();
     try {
         if (const auto result = d_func<Impl>().frame_control->request(*this); !result) return unexpected(result.error());
     }
     catch (...) {
-        notify_model_dirty();
         ::renderive::error::unexpected(
             "rolling back plot frame preparation",
             std::current_exception());
@@ -205,7 +202,6 @@ void detail::Render_Scene_2D::with_frame(
 }
 void detail::Render_Scene_2D::activate_view() {
     d_func<Impl>().active.store(true, std::memory_order_release);
-    notify_model_dirty();
 }
 void detail::Render_Scene_2D::deactivate_view() noexcept {
     d_func<Impl>().active.store(false, std::memory_order_release);
@@ -213,9 +209,6 @@ void detail::Render_Scene_2D::deactivate_view() noexcept {
 bool detail::Render_Scene_2D::view_active() const noexcept {
     return d_func<Impl>().active.load(std::memory_order_acquire);
 }
-void detail::Render_Scene_2D::request_redraw() noexcept {
-    notify_model_dirty();
-}
 void detail::Render_Scene_2D::set_presentation_sink(
     std::weak_ptr<Presentation_Sink> sink) {
     auto& impl = d_func<Impl>();
@@ -229,11 +222,8 @@ std::shared_ptr<Performance_Overlay> detail::Render_Scene_2D::performance_overla
 }
 void detail::Render_Scene_2D::set_performance_overlay(
     std::shared_ptr<Performance_Overlay> overlay) {
-    {
-        auto& impl = d_func<Impl>();
-        std::lock_guard lock(impl.control_mutex);
-        impl.performance = std::move(overlay);
-    }
-    notify_model_dirty();
+    auto& impl = d_func<Impl>();
+    std::lock_guard lock(impl.control_mutex);
+    impl.performance = std::move(overlay);
 }
 } // namespace renderive
diff --git a/render_2D/render_2D/scene/Render_Scene_2D.h b/render_2D/render_2D/scene/Render_Scene_2D.h
index 8ec00f1..b96cb70 100644
--- a/render_2D/render_2D/scene/Render_Scene_2D.h
+++ b/render_2D/render_2D/scene/Render_Scene_2D.h
@@ -17,7 +17,6 @@ enum class Plot_Render_Status : std::uint8_t {
     rendered,
     view_inactive,
     empty_viewport,
-    model_unchanged
 };
 enum class Plot_Render_Frame_Error : std::uint8_t {
     painter_unavailable,
@@ -108,12 +107,11 @@ public:
     struct Observer : Base::template next_Observer<Observer>, Observer_Fields {};
     [[nodiscard]] ::renderive_Owner<::renderive::Renderable> root_renderable() const;
     void dispatch_event(const Event& event);
-    [[nodiscard]] auto render_frame(bool force = false) -> Expected<Plot_Render_Status, Plot_Render_Frame_Error>;
+    [[nodiscard]] auto render_frame() -> Expected<Plot_Render_Status, Plot_Render_Frame_Error>;
     void with_frame(const std::function<void(Image_View)>& consumer);
     void activate_view();
     void deactivate_view() noexcept;
     [[nodiscard]] bool view_active() const noexcept;
-    void request_redraw() noexcept;
     void set_presentation_sink(std::weak_ptr<Presentation_Sink> sink);
     [[nodiscard]] std::shared_ptr<Performance_Overlay> performance_overlay() const;
     void set_performance_overlay(
diff --git a/render_2D/tests/render_2D_Frame_Pipeline_Tests.cpp b/render_2D/tests/render_2D_Frame_Pipeline_Tests.cpp
index 2f5a9d3..536cc7c 100644
--- a/render_2D/tests/render_2D_Frame_Pipeline_Tests.cpp
+++ b/render_2D/tests/render_2D_Frame_Pipeline_Tests.cpp
@@ -21,7 +21,7 @@ TEST(RenderScene2DFramePipeline, BuilderOwnsConstructionAndState) {
     EXPECT_EQ(scene->root_renderable()->object_name(), "root");
 }
 
-TEST(RenderScene2DFramePipeline, ActiveDirtyAndForceGatesAreOrthogonal) {
+TEST(RenderScene2DFramePipeline, SceneValidityDoesNotGateStrategyProgress) {
     Render_Scene_2D::State state;
     state.viewport = {80, 45};
     auto scene = make_scene(state);
@@ -30,8 +30,7 @@ TEST(RenderScene2DFramePipeline, ActiveDirtyAndForceGatesAreOrthogonal) {
     EXPECT_EQ(scene->render_frame().value(), Plot_Render_Status::view_inactive);
     scene->activate_view();
     EXPECT_EQ(scene->render_frame().value(), Plot_Render_Status::rendered);
-    EXPECT_EQ(scene->render_frame().value(), Plot_Render_Status::model_unchanged);
-    EXPECT_EQ(scene->render_frame(true).value(), Plot_Render_Status::rendered);
+    EXPECT_EQ(scene->render_frame().value(), Plot_Render_Status::rendered);
     EXPECT_EQ(scene->wait_for_render(), Scene_Render_Result::none);
 }
 
@@ -40,7 +39,7 @@ TEST(RenderScene2DFramePipeline, ObserverReadsPublishedDoubleBufferedState) {
     state.viewport = {32, 24};
     auto scene = make_scene(state);
     scene->activate_view();
-    ASSERT_EQ(scene->render_frame(true).value(), Plot_Render_Status::rendered);
+    ASSERT_EQ(scene->render_frame().value(), Plot_Render_Status::rendered);
     ASSERT_EQ(scene->wait_for_render(), Scene_Render_Result::none);
     const auto observation = scene->observer();
     EXPECT_EQ(observation.state, state);
diff --git a/render_2D/tests/render_2D_Integration_Tests.cpp b/render_2D/tests/render_2D_Integration_Tests.cpp
index 3dfd559..f771adf 100644
--- a/render_2D/tests/render_2D_Integration_Tests.cpp
+++ b/render_2D/tests/render_2D_Integration_Tests.cpp
@@ -11,7 +11,7 @@ TEST(RenderScene2DIntegration, BuilderStatePublishesAtFrameBoundary) {
     auto scene = Render_Scene_2D::Builder{initial}.build(
         std::make_shared<Manual_Render_Scene_2D_Strategy>());
     scene->activate_view();
-    ASSERT_EQ(scene->render_frame(true).value(), Plot_Render_Status::rendered);
+    ASSERT_EQ(scene->render_frame().value(), Plot_Render_Status::rendered);
     ASSERT_EQ(scene->wait_for_render(), Scene_Render_Result::none);
     EXPECT_EQ(scene->observer().state, initial);
 }
@@ -22,7 +22,7 @@ TEST(RenderScene2DIntegration, FrameImageMatchesConfiguredViewport) {
     auto scene = Render_Scene_2D::Builder{state}.build(
         std::make_shared<Low_Latency_Render_Scene_2D_Strategy>());
     scene->activate_view();
-    ASSERT_EQ(scene->render_frame(true).value(), Plot_Render_Status::rendered);
+    ASSERT_EQ(scene->render_frame().value(), Plot_Render_Status::rendered);
     ASSERT_EQ(scene->wait_for_render(), Scene_Render_Result::none);
     scene->with_frame([](Image_View image) {
         EXPECT_EQ(image.width, 48);
diff --git a/render_3D/render_3D/Render_Scene_3D.cpp b/render_3D/render_3D/Render_Scene_3D.cpp
index d34aca6..5492139 100644
--- a/render_3D/render_3D/Render_Scene_3D.cpp
+++ b/render_3D/render_3D/Render_Scene_3D.cpp
@@ -132,7 +132,7 @@ struct detail::Render_Scene_3D::Impl
                                     backend_state(
                                         std::make_shared<Point_Backend_State>(gpu_index)) {}
     Scene_Control_Error dispatch_pointer(
-        Render_Scene_3D& scene, ::renderive::Event_Type type, float x,
+        ::renderive::Event_Type type, float x,
         float y, ::renderive::Mouse_Button button,
         ::renderive::Keyboard_Modifier modifiers) {
         const Extent viewport =
@@ -147,12 +147,10 @@ struct detail::Render_Scene_3D::Impl
                 return Scene_Control_Error::none;
             });
         if (!invocation) return Scene_Control_Error::backend_unavailable;
-        const auto error = *invocation.value;
-        if (error == Scene_Control_Error::none) scene.notify_model_dirty();
-        return error;
+        return *invocation.value;
     }
     Scene_Control_Error dispatch_wheel(
-        Render_Scene_3D& scene, float x, float y, float delta_x,
+        float x, float y, float delta_x,
         float delta_y, ::renderive::Keyboard_Modifier modifiers) {
         const Extent viewport =
         scene_state.template get<&State::viewport>();
@@ -166,12 +164,9 @@ struct detail::Render_Scene_3D::Impl
                 return Scene_Control_Error::none;
             });
         if (!invocation) return Scene_Control_Error::backend_unavailable;
-        const auto error = *invocation.value;
-        if (error == Scene_Control_Error::none) scene.notify_model_dirty();
-        return error;
+        return *invocation.value;
     }
-    Scene_Control_Error dispatch_key(Render_Scene_3D& scene,
-                                     const ::renderive::Key_Event& event) {
+    Scene_Control_Error dispatch_key(const ::renderive::Key_Event& event) {
         const auto backend = backend_state;
         if (!backend->backend_available()) return Scene_Control_Error::backend_unavailable;
         const auto invocation = backend->render_domain->invoke(
@@ -181,9 +176,7 @@ struct detail::Render_Scene_3D::Impl
                 return Scene_Control_Error::none;
             });
         if (!invocation) return Scene_Control_Error::backend_unavailable;
-        const auto error = *invocation.value;
-        if (error == Scene_Control_Error::none) scene.notify_model_dirty();
-        return error;
+        return *invocation.value;
     }
     [[nodiscard]] std::shared_ptr<const Pixel_Frame> latest_frame() const {
         const auto backend = backend_state;
@@ -394,7 +387,6 @@ struct detail::Render_Scene_3D::Impl
             });
         const auto published = scene_state.published_state();
         if (pending.viewport != published.viewport) invalidate_renderables();
-        else if (pending != published) scene().notify_model_dirty();
     }
     void swap_scene_state() override {
         scene_state.publish();
@@ -501,7 +493,7 @@ Scene_Control_Error detail::Render_Scene_3D::dispatch(
             !std::isfinite(angle_delta_y))
             return Scene_Control_Error::invalid_event;
         return d_func<Impl>().dispatch_wheel(
-            *this, x, y,
+            x, y,
             datoviz_wheel_step(pixel_delta_x, angle_delta_x),
             datoviz_wheel_step(pixel_delta_y, angle_delta_y),
             pointer->keyboard_modifiers());
@@ -516,10 +508,10 @@ Scene_Control_Error detail::Render_Scene_3D::dispatch(
             event.type != ::renderive::Event_Type::Pointer_Release)
             return Scene_Control_Error::invalid_event;
         return d_func<Impl>().dispatch_pointer(
-            *this, event.type, x, y, pointer->pointer_button(),
+            event.type, x, y, pointer->pointer_button(),
             pointer->keyboard_modifiers());
     }
-    if (const auto* key = dynamic_cast<const ::renderive::Key_Event*>(&event)) return d_func<Impl>().dispatch_key(*this, *key);
+    if (const auto* key = dynamic_cast<const ::renderive::Key_Event*>(&event)) return d_func<Impl>().dispatch_key(*key);
     return Scene_Control_Error::none;
 }
 Frame_Request_Result detail::Render_Scene_3D::request_frame() {
diff --git a/web_server/app/Web_Plot_Session.cpp b/web_server/app/Web_Plot_Session.cpp
index 76a48ea..e6dc7a2 100644
--- a/web_server/app/Web_Plot_Session.cpp
+++ b/web_server/app/Web_Plot_Session.cpp
@@ -22,7 +22,7 @@ struct Web_Plot_Session::Impl {
         return std::visit([this](const auto& value) -> std::optional<Web_Response> {
             using T = std::decay_t<decltype(value)>;
             if constexpr (std::same_as<T, Frame_Request>) {
-                const auto result = scene->render_frame(true);
+                const auto result = scene->render_frame();
                 if (!result || scene->wait_for_render() != Scene_Render_Result::none)
                     return std::nullopt;
                 std::string pixels;
diff --git a/web_server/app/render_2D/Gallery_Scene2D.cpp b/web_server/app/render_2D/Gallery_Scene2D.cpp
index c998dbc..b2f08e5 100644
--- a/web_server/app/render_2D/Gallery_Scene2D.cpp
+++ b/web_server/app/render_2D/Gallery_Scene2D.cpp
@@ -137,7 +137,7 @@ public:
 
     bool request_frame() override {
         update_samples();
-        const auto result = scene_->render_frame(true);
+        const auto result = scene_->render_frame();
         if (!result || *result != Plot_Render_Status::rendered)
             return false;
         if (scene_->wait_for_render() != Scene_Render_Result::none)