Fixes the screen shot update issue due to lazy update

of the vtk's windowToImageFilter

Examples/LaparoscopicCamera/main.cpp

@@ -206,8 +206,8 @@ void add2DOverlay(std::shared_ptr<VTKViewer> vtkViewer)
 
     table->SetNumberOfRows(numPoints + 1);
 
-    double radius1 = range / 6;
-    double radius2 = range / 8;
+    double radius1 = range / 8;
+    double radius2 = range / 10;
     double theta;
 
     for (int i = 0; i < numPoints; i++)

VTKRendering/VTKViewer.cpp

@@ -78,7 +78,7 @@ public:
                     {
                         if (this->screenCaptureData->triggerScreenCapture)
                         {
-                            //this->screenCaptureData->windowToImageFilter->Update();
+                            this->screenCaptureData->windowToImageFilter->Modified();
 
                             std::string captureName = "screenShot-"
                                 + std::to_string(this->screenCaptureData->screenShotNumber)