feat: add Preferences dialog for managing theme, rendering, and unit settings

src/Vtk/vtkQViewport.cpp

@@ -20,17 +20,25 @@ QViewport::QViewport(QWidget* parent)
     , m_VtkWidget(nullptr)
     , m_GridButton(nullptr)
     , m_ProjButton(nullptr)
+    , m_renderTimer(nullptr)
+    , m_renderPending(false)
 {
     // Build the layout – zero margins so VTK fills the entire widget
     auto* layout = new QVBoxLayout(this);
     layout->setContentsMargins(0, 0, 0, 0);
     layout->setSpacing(0);
-
+ 
     m_VtkWidget = new QVTKOpenGLNativeWidget(this);
     layout->addWidget(m_VtkWidget);
-
+ 
+    // Initialize render timer
+    m_renderTimer = new QTimer(this);
+    m_renderTimer->setSingleShot(true);
+    connect(m_renderTimer, &QTimer::timeout, this, &QViewport::doRender);
+ 
     // Grid Toggle Button
     m_GridButton = new QPushButton(m_VtkWidget);
+
     m_GridButton->setText("#");
     m_GridButton->setFixedSize(40, 40);
     m_GridButton->setToolTip("Toggle Grid");
@@ -112,9 +120,21 @@ void QViewport::SetupPipeline()
 
 void QViewport::Render()
 {
-    if (m_VtkWidget && m_VtkWidget->renderWindow())
-        m_VtkWidget->renderWindow()->Render();
+    if (!m_throttledRendering) {
+        doRender();
+        return;
+    }
+    if (m_renderPending) return;
+    m_renderPending = true;
+    m_renderTimer->start(16);
 }
+ 
+ void QViewport::doRender()
+ {
+     m_renderPending = false;
+     if (m_VtkWidget && m_VtkWidget->renderWindow())
+         m_VtkWidget->renderWindow()->Render();
+ }
 
 vtkRenderWindow* QViewport::GetRenderWindow()
 {