Moved _frameStamp initialization in constructor

Author: robertosfield

include/vsg/app/Viewer.h

@@ -153,11 +153,13 @@ namespace vsg
 
         bool _close = false;
 
-        ref_ptr<FrameStamp> _frameStamp;
 
         Windows _windows;
 
+        bool _firstFrame = true;
         clock::time_point _start_point;
+        ref_ptr<FrameStamp> _frameStamp;
+
         UIEvents _events;
         EventHandlers _eventHandlers;
 

src/vsg/app/Viewer.cpp

@@ -31,7 +31,9 @@ Viewer::Viewer() :
     updateOperations(UpdateOperations::create()),
     animationManager(AnimationManager::create()),
     status(vsg::ActivityStatus::create()),
-    _start_point(clock::now())
+    _firstFrame(true),
+    _start_point(clock::now()),
+    _frameStamp(FrameStamp::create(_start_point, 0, 0.0))
 {
     CPU_INSTRUMENTATION_L1_NC(instrumentation, "Viewer costructor", COLOR_VIEWER);
 }
@@ -169,9 +171,9 @@ bool Viewer::advanceToNextFrame(double simulationTime)
 
     // create FrameStamp for frame
     auto time = vsg::clock::now();
-    if (!_frameStamp)
+    if (_firstFrame)
     {
-        _start_point = time;
+        _firstFrame = false;
 
         if (simulationTime == UseTimeSinceStartPoint) simulationTime = 0.0;