fix display of cylinder

src/Vtk/Math/vtkCylinder.cpp

@@ -55,17 +55,12 @@ void vtkCylinder::contentUpdate() {
   vtkProp3D* root = vtkProp3D::SafeDownCast(this->GetProp());
   if (!root) return;
 
-  // 1. Placement (Position/Rotation/Model-level Scale) goes to the root prop
-  vtkMatrix4x4* vmat = root->GetUserMatrix();
-  if (!vmat) {
-    vtkNew<vtkMatrix4x4> mat;
-    root->SetUserMatrix(mat);
-    vmat = mat;
-  }
-  Matrix4f transform = m_Content->GetMatrix();
-  Matrix4fToVtk(transform, vmat);
+  // 1. Placement handled by base Puppet class via Sync / Update logic
+  // Update internal pd->m_Transform from content
+  Puppet::Update();
 
   // 2. Shape-local properties (Radius, Height, Axis alignment) go to the internal actor
+  // These are relative to the root assembly
   vtkTransform* alignment = vtkTransform::SafeDownCast(m_Actor->GetUserTransform());
   if (alignment) {
       alignment->Identity();
@@ -83,23 +78,29 @@ void vtkCylinder::contentUpdate() {
   }
 
   root->Modified();
-  Puppet::Update();
 }
 
 void vtkCylinder::Update() {
+  this->contentUpdate();
+}
+
+void vtkCylinder::SyncFromVtk() {
   if (!m_Content) return;
   
-  vtkProp3D* root = vtkProp3D::SafeDownCast(this->GetProp());
-  if (!root) return;
+  vtkProp3D* assembly = vtkProp3D::SafeDownCast(this->GetProp());
+  if (!assembly) return;
 
-  vtkMatrix4x4* vmat = root->GetUserMatrix();
-  if (!vmat) return;
+  double pos[3], ori[3], scale[3];
+  assembly->GetPosition(pos);
+  assembly->GetOrientation(ori);
+  assembly->GetScale(scale);
   
-  // Pull the placement matrix directly from VTK
-  Matrix4f transform = VtkToMatrix4f(vmat);
-  m_Content->SetMatrix(transform);
+  m_Content->SetPosition(Vector3f(pos[0], pos[1], pos[2]));
+  // Convert VTK degrees to model radians
+  m_Content->SetOrientation(Vector3f(ori[0], ori[1], ori[2]) * CLHEP::degree);
+  m_Content->SetScale(Vector3f(scale[0], scale[1], scale[2]));
   
-  m_Content->Updated();
+  m_Content->Updated(); // Notify change
 }
 
 void vtkCylinder::InstallPipe() {

src/Vtk/Math/vtkCylinder.h

@@ -52,7 +52,10 @@ public:
   virtual void contentUpdate();
 
   /** Synchronizes the uLib model matrix with the VTK actor (e.g., after UI manipulation) */
-  virtual void Update();
+  virtual void Update() override;
+
+  /** Synchronizes the uLib model matrix with the VTK actor specifically for gizmo interactions */
+  virtual void SyncFromVtk() override;
 
   virtual uLib::Object* GetContent() const override { return (uLib::Object*)m_Content; }
 

src/Vtk/uLibVtkInterface.cxx

@@ -121,6 +121,7 @@ public:
     TRS m_Transform;
 
     void ApplyAppearance(vtkProp *p) {
+        if (!p) return;
         p->SetVisibility(m_Visibility);
         p->SetPickable(m_Selectable);
         p->SetDragable(m_Dragable);
@@ -143,6 +144,13 @@ public:
             if (m_Opacity != -1.0) {
                 actor->GetProperty()->SetOpacity(m_Opacity);
             }
+        } else if (vtkAssembly *asm_p = vtkAssembly::SafeDownCast(p)) {
+            // Recursively apply to parts of the assembly
+            vtkProp3DCollection *parts = asm_p->GetParts();
+            parts->InitTraversal();
+            for (int i = 0; i < parts->GetNumberOfItems(); ++i) {
+                this->ApplyAppearance(parts->GetNextProp3D());
+            }
         }
     }