BUG: render in setRenderingMode if viewer running

1) Only update the renderWindow in setRenderingMode if
the viewer is up and running

2) Do not set a renderMode when setting a new current
scene if the viewer is not yet rendering.

Base/SimulationManager/imstkSimulationManager.cpp

@@ -131,14 +131,27 @@ SimulationManager::setCurrentScene(std::string newSceneName, bool unloadCurrentS
         return;
     }
 
-    // Update viewer
+    // Update viewer scene
     m_viewer->setCurrentScene(newScene);
+
+    // If not yet rendering: update current scene and return
+    if(!m_viewer->isRendering())
+    {
+        m_currentSceneName = newSceneName;
+        return;
+    }
+
+    // If rendering and simulation not active:
+    // render scene in debug, update current scene, and return
     if (m_status == SimulationStatus::INACTIVE)
     {
         m_viewer->setRenderingMode(Renderer::Mode::DEBUG);
         m_currentSceneName = newSceneName;
         return;
     }
+
+    // If rendering and simulation active:
+    // render scene in simulation mode, and update simulation
     m_viewer->setRenderingMode(Renderer::Mode::SIMULATION);
 
     // Stop/Pause running scene
@@ -195,6 +208,11 @@ SimulationManager::startSimulation(bool debug)
         this->startModuleInNewThread(startingScene);
         m_status = SimulationStatus::RUNNING;
     }
+    // Start Debug
+    else
+    {
+        m_viewer->setRenderingMode(Renderer::Mode::DEBUG);
+    }
 
     // Start Rendering
     if( !m_viewer->isRendering() )

Base/SimulationManager/imstkViewer.cpp

@@ -80,6 +80,12 @@ Viewer::setRenderingMode(Renderer::Mode mode)
 
     // Setup renderer
     m_rendererMap.at(m_currentScene)->setup(mode);
+    if( !m_running )
+    {
+        return;
+    }
+
+    // Render to update displayed actors
     m_vtkRenderWindow->Render();
 
     // Setup render window