PropertyPanel Update

README.md

@@ -10,9 +10,10 @@ A C++17 / Windows desktop application providing a **Maya Render Layers-style** U
 - **Scene Hierarchy** — Browse prim tree with per-type SVG icons; create, delete, rename prims; add/replace references
 - **Property Editor** — Maya Channel Box-style attribute editing with type-aware drag inputs, color pickers, and undoable transforms
 - **3D Viewport** — Hydra rendering via `UsdImagingGLEngine` into an offscreen FBO; switchable render delegates; grid overlay; selection bounding boxes; camera wireframes
-- **Camera Control** — Free orbital camera (tumble/truck/dolly) or drive from USD camera prims; auto near/far clipping; frame selection
+- **Multi-Viewport** — Single, horizontal split, vertical split, and quad layouts; per-tile camera and render settings; Space to maximize/restore
+- **Camera Control** — Free orbital camera (tumble/truck/dolly) or drive from USD camera prims; auto near/far clipping; frame selection; correct camera prim orientation for Y-up and Z-up stages
 - **Transform Gizmo** — Pure ImDrawList-based manipulator (translate/rotate/scale) in object or world space
-- **Undo/Redo** — Full command history for prim creation/deletion, attribute edits, transform changes, and layer operations
+- **Undo/Redo** — Full command history for prim creation/deletion, attribute edits, transform changes, and layer operations; Ctrl+Z / Ctrl+Y hotkeys; Edit menu integration
 - **Multi-select** — Rectangular selection in viewport with cross-panel syncing
 
 ## Dependencies
@@ -59,15 +60,23 @@ src/
 ├── core/                     — USD business logic (no UI dependency)
 │   ├── UsdStageManager       — Stage open/create/save/close lifecycle
 │   ├── LayerManager          — Layer stack introspection and mutation
-│   ├── PropertyManager       — Property read/write via edit target
+│   ├── PropertyManager       — Property read/write via edit target with undo
 │   ├── CommandHistory        — Undo/redo stack for ICommand instances
 │   ├── UsdSceneRenderer      — Hydra rendering + picking + overlays
 │   ├── ViewportCamera        — Free / USD-camera-driven orbital camera
 │   └── commands/             — ICommand subclasses for all mutable operations
+│       ├── TransformCommand      — Undoable translate/rotate/scale
+│       ├── CreatePrimCommand     — Undoable prim creation (with camera orientation)
+│       ├── DeletePrimCommand     — Undoable prim deletion (SdfCopySpec snapshot)
+│       ├── AttributeSetCommand   — Type-agnostic undoable attribute writes
+│       ├── AddReferenceCommand   — Undoable reference addition
+│       ├── ReplaceReferenceCommand — Undoable reference replacement
+│       └── LayerCommands         — Create, remove, reorder sublayers
 ├── ui/                       — ImGui panels and application shell
 │   ├── Application           — App shell (owns managers/panels, docking, menus)
 │   ├── ImGuiContext           — Win32+OpenGL+ImGui initialization and loop
-│   ├── ViewportPanel         — 3D viewport with toolbar, picking, camera
+│   ├── ViewportPanel         — Viewport container (layout, divider drag, maximize)
+│   ├── ViewportTile          — Single viewport tile (camera, rendering, overlays, picking)
 │   ├── SceneHierarchyPanel   — Prim tree browser with context menus
 │   ├── PropertyPanel         — Attribute/transform editor (channel box-style)
 │   ├── LayerPanel            — Layer stack editor with modal dialogs

openspec/changes/undo-redo-scene-editing/tasks.md

@@ -23,7 +23,7 @@
 ## 4. Attribute Edit Commands
 
 - [x] 4.1 Create `src/core/commands/AttributeSetCommand.h/.cpp` — stores `std::string description`, `std::function<void()> executeFunc`, `std::function<void()> undoFunc`; captures old value before set using `UsdAttribute::Get<T>` at the call site
-- [ ] 4.2 Modify `PropertyManager::SetPropertyValue` and `SetPropertyValueInLayer` — read old value, construct `AttributeSetCommand` with closures for old/new applies, push to `CommandHistory`
+- [x] 4.2 Modify `PropertyManager::SetPropertyValue` and `SetPropertyValueInLayer` — read old value, construct `AttributeSetCommand` with closures for old/new applies, push to `CommandHistory`
 
 ## 5. Layer Operation Commands
 

src/core/PropertyManager.cpp

@@ -1,5 +1,7 @@
 #include "PropertyManager.h"
 #include "LayerManager.h"
+#include "CommandHistory.h"
+#include "commands/AttributeSetCommand.h"
 #include "../utils/Logger.h"
 #include <pxr/usd/usd/prim.h>
 #include <pxr/usd/usd/primRange.h>
@@ -123,7 +125,40 @@ bool PropertyManager::SetPropertyValue(const std::string& primPath,
         return false;
     }
     
-    // If a current layer is set, create an edit context to target it
+    // Capture old value for undo
+    PropertyValue oldValue = ExtractValue(attr);
+    SdfLayerHandle targetLayer = m_currentLayer ? m_currentLayer : m_stage->GetEditTarget().GetLayer();
+    
+    // Create command with closures that capture old/new values and layer context
+    if (m_commandHistory) {
+        auto executeFunc = [this, primPath, propName, value, targetLayer]() {
+            UsdPrim p = GetPrim(primPath);
+            if (!p.IsValid()) return;
+            UsdAttribute a = p.GetAttribute(TfToken(propName));
+            if (!a.IsValid()) return;
+            
+            UsdEditContext editCtx(m_stage, targetLayer);
+            ApplyValue(a, value);
+        };
+        
+        auto undoFunc = [this, primPath, propName, oldValue, targetLayer]() {
+            UsdPrim p = GetPrim(primPath);
+            if (!p.IsValid()) return;
+            UsdAttribute a = p.GetAttribute(TfToken(propName));
+            if (!a.IsValid()) return;
+            
+            UsdEditContext editCtx(m_stage, targetLayer);
+            ApplyValue(a, oldValue);
+        };
+        
+        std::string description = "Set " + propName + " on " + primPath;
+        m_commandHistory->Push(std::make_unique<AttributeSetCommand>(
+            description, executeFunc, undoFunc
+        ));
+        
+        return true;
+    } else {
+        // Fallback: apply directly without undo support
         try {
             if (m_currentLayer) {
                 UsdEditContext editCtx(m_stage, m_currentLayer);
@@ -136,6 +171,7 @@ bool PropertyManager::SetPropertyValue(const std::string& primPath,
             return false;
         }
     }
+}
 
 bool PropertyManager::SetPropertyValueInLayer(const std::string& primPath,
                                                 const std::string& propName,
@@ -147,6 +183,40 @@ bool PropertyManager::SetPropertyValueInLayer(const std::string& primPath,
     UsdAttribute attr = prim.GetAttribute(TfToken(propName));
     if (!attr.IsValid()) return false;
     
+    // Capture old value for undo
+    PropertyValue oldValue = ExtractValue(attr);
+    
+    // Create command with closures that capture old/new values and layer context
+    if (m_commandHistory) {
+        auto executeFunc = [this, primPath, propName, value, layer]() {
+            UsdPrim p = GetPrim(primPath);
+            if (!p.IsValid()) return;
+            UsdAttribute a = p.GetAttribute(TfToken(propName));
+            if (!a.IsValid()) return;
+            
+            UsdEditContext editCtx(m_stage, layer);
+            ApplyValue(a, value);
+        };
+        
+        auto undoFunc = [this, primPath, propName, oldValue, layer]() {
+            UsdPrim p = GetPrim(primPath);
+            if (!p.IsValid()) return;
+            UsdAttribute a = p.GetAttribute(TfToken(propName));
+            if (!a.IsValid()) return;
+            
+            UsdEditContext editCtx(m_stage, layer);
+            ApplyValue(a, oldValue);
+        };
+        
+        std::string layerName = layer ? LayerManager::ExtractDisplayName(layer->GetIdentifier()) : "default";
+        std::string description = "Set " + propName + " on " + primPath + " in " + layerName;
+        m_commandHistory->Push(std::make_unique<AttributeSetCommand>(
+            description, executeFunc, undoFunc
+        ));
+        
+        return true;
+    } else {
+        // Fallback: apply directly without undo support
         try {
             UsdEditContext editCtx(m_stage, layer);
             return ApplyValue(attr, value);
@@ -155,6 +225,7 @@ bool PropertyManager::SetPropertyValueInLayer(const std::string& primPath,
             return false;
         }
     }
+}
 
 std::string PropertyManager::GetPropertyLayerStack(const UsdAttribute& attr) {
     if (!attr.IsValid()) return "";

src/core/PropertyManager.h

@@ -13,6 +13,8 @@ PXR_NAMESPACE_USING_DIRECTIVE
 
 namespace UsdLayerManager {
 
+class CommandHistory;
+
 using PropertyValue = std::variant<
     bool, int, float, double, std::string,
     pxr::GfVec3f, pxr::GfVec3d
@@ -35,6 +37,7 @@ public:
     
     void SetStage(UsdStageRefPtr stage);
     void SetCurrentLayer(const SdfLayerHandle& layer);
+    void SetCommandHistory(CommandHistory* history) { m_commandHistory = history; }
     SdfLayerHandle GetCurrentLayer() const { return m_currentLayer; }
     
     // Prim properties
@@ -61,6 +64,7 @@ private:
     
     UsdStageRefPtr m_stage;
     SdfLayerHandle m_currentLayer;
+    CommandHistory* m_commandHistory = nullptr;
 };
 
 } // namespace UsdLayerManager

src/ui/Application.cpp

@@ -56,6 +56,7 @@ bool Application::Initialize(const std::string& windowTitle, int width, int heig
     m_stageManager = std::make_unique<UsdStageManager>();
     m_layerManager = std::make_unique<LayerManager>();
     m_propertyManager = std::make_unique<PropertyManager>();
+    m_propertyManager->SetCommandHistory(&m_commandHistory);
     m_layerPanel = std::make_unique<LayerPanel>();
     m_layerPanel->SetLayerManager(m_layerManager.get());
     m_layerPanel->SetCommandHistory(&m_commandHistory);