test version will be rewritten before main.

tests/planet.cpp

@@ -32,6 +32,7 @@ private:
     std::map<int, bool> keyStates;
     float deltaTime = 0.16f;
     bool orbitEquator = false;
+    bool collapsed;
     float rotationRadius = 2500;
     float angle = 0.0f;
     const float ω = (std::pow(M_PI, 2) / 30) / 10;
@@ -84,7 +85,7 @@ public:
 
     void renderUI(GLFWwindow* window) {
         handleCameraControls(window);
-        ImGui::Begin("Planet Simulation");
+        collapsed = ImGui::Begin("Planet Simulation");
         if (ImGui::BeginTable("MainLayout", 2, ImGuiTableFlags_Resizable | ImGuiTableFlags_BordersOuter)) {
             ImGui::TableSetupColumn("Controls", ImGuiTableColumnFlags_WidthStretch, 0.3f);
             ImGui::TableSetupColumn("Preview", ImGuiTableColumnFlags_WidthStretch, 0.7f);
@@ -289,8 +290,9 @@ public:
 
     void renderPreviewPanel() {
         ImGui::BeginChild("PreviewChild", ImVec2(0, 0), true, ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoScrollWithMouse);
-        
-        livePreview();
+        if (!collapsed) {
+            livePreview();
+        }
         if (textureInitialized) {
             float aspect = (float)currentPreviewFrame.getWidth() / (float)currentPreviewFrame.getHeight();
             float availWidth = ImGui::GetContentRegionAvail().x;