put the RefractiveIndex::_vidGrabber.grabFrame(); // in each class

david's solution for the black frames...

example/RefractiveIndex.cpp

@@ -189,13 +189,15 @@ void RefractiveIndex::state_analysis()
 void RefractiveIndex::update()
 {
     state_analysis();
-    
+    /*
     RefractiveIndex::_vidGrabber.grabFrame();  // get a new frame from the camera
 
     if (_vidGrabber.isFrameNew())
     {
         _pixels = _vidGrabber.getPixelsRef(); //get ofPixels from the camera
     }
+     */
+    
 }
 
 void RefractiveIndex::draw()
@@ -213,7 +215,8 @@ void RefractiveIndex::setup_camera()
         ofLog(OF_LOG_ERROR) << "RefractiveIndex::setup_camera - could not initialise grabber";
         return;
     }
-    
+
+    _vidGrabber.setUseTexture(false);
     _vidGrabber.listDevices();
 	_vidGrabber.setVerbose(true);
     _vid_stream_open = true;

src/CamNoiseAnalysis.cpp

@@ -240,8 +240,14 @@ void CamNoiseAnalysis::draw()
 // this runs at save_cb timer rate = DELTA_T_SAVE
 void CamNoiseAnalysis::save_cb(Timer& timer)
 {
-  
     _save_cnt++;
+
+    RefractiveIndex::_vidGrabber.grabFrame();  // get a new frame from the camera
+    
+    if (RefractiveIndex::_vidGrabber.isFrameNew())
+    {
+        RefractiveIndex::_pixels = RefractiveIndex::_vidGrabber.getPixelsRef(); //get ofPixels from the camera
+    }
     
     cout << "CamNoiseAnalysis::saving...\n";
     

src/ColorMultiAnalysis.cpp

@@ -235,6 +235,13 @@ void ColorMultiAnalysis::save_cb(Timer& timer)
   
     _save_cnt++;
     
+    RefractiveIndex::_vidGrabber.grabFrame();  // get a new frame from the camera
+    
+    if (RefractiveIndex::_vidGrabber.isFrameNew())
+    {
+        RefractiveIndex::_pixels = RefractiveIndex::_vidGrabber.getPixelsRef(); //get ofPixels from the camera
+    }
+    
     cout << "ColorMultiAnalysis::saving...\n";
     
     string file_name = ofToString(_save_cnt,2)+"_"+ofToString(c,2)+"_"+ofToString(_run_cnt,2)+".jpg";

src/ColorSingleAnalysis.cpp

@@ -249,6 +249,13 @@ void ColorSingleAnalysis::save_cb(Timer& timer)
 {
     _save_cnt++;
     
+    RefractiveIndex::_vidGrabber.grabFrame();  // get a new frame from the camera
+    
+    if (RefractiveIndex::_vidGrabber.isFrameNew())
+    {
+        RefractiveIndex::_pixels = RefractiveIndex::_vidGrabber.getPixelsRef(); //get ofPixels from the camera
+    }
+    
     cout << "ColorSingleAnalysis::saving...\n";
     
     string file_name =ofToString(_save_cnt,2)+"_"+fileNameTag+"_"+ofToString(_run_cnt,2)+".jpg";

src/DiffNoiseAnalysis.cpp

@@ -254,6 +254,13 @@ void DiffNoiseAnalysis::save_cb(Timer& timer)
 {
     _save_cnt++;
     
+    RefractiveIndex::_vidGrabber.grabFrame();  // get a new frame from the camera
+    
+    if (RefractiveIndex::_vidGrabber.isFrameNew())
+    {
+        RefractiveIndex::_pixels = RefractiveIndex::_vidGrabber.getPixelsRef(); //get ofPixels from the camera
+    }
+    
     cout << "DiffNoiseAnalysis::saving...\n";
     
     string file_name = ofToString(_save_cnt,2)+"_"+ ofToString(c,2)+"_"+ofToString(_run_cnt,2)+".jpg";

src/RelaxRateAnalysis.cpp

@@ -220,6 +220,13 @@ void RelaxRateAnalysis::save_cb(Timer& timer)
 {
     _save_cnt++;
     
+    RefractiveIndex::_vidGrabber.grabFrame();  // get a new frame from the camera
+    
+    if (RefractiveIndex::_vidGrabber.isFrameNew())
+    {
+        RefractiveIndex::_pixels = RefractiveIndex::_vidGrabber.getPixelsRef(); //get ofPixels from the camera
+    }
+    
     cout << "RelaxRateAnalysis::saving...\n";
     
     string file_name = ofToString(_save_cnt,2)+"_"+ ofToString(c,2)+"_"+ofToString(_run_cnt,2)+".jpg";

src/ShadowScapesAnalysis.cpp

@@ -271,6 +271,14 @@ void ShadowScapesAnalysis::save_cb(Timer& timer)
     
     _save_cnt++;
     
+    RefractiveIndex::_vidGrabber.grabFrame();  // get a new frame from the camera
+    
+    if (RefractiveIndex::_vidGrabber.isFrameNew())
+    {
+        RefractiveIndex::_pixels = RefractiveIndex::_vidGrabber.getPixelsRef(); //get ofPixels from the camera
+    }
+    
+    
     cout << "ShadowScapesAnalysis::saving...\n";
     
     string file_name;

src/ShapeFromShadingAnalysis.cpp

@@ -427,6 +427,13 @@ void ShapeFromShadingAnalysis::draw()
 void ShapeFromShadingAnalysis::save_cb(Timer& timer)
 {
     _save_cnt++;
+        
+    RefractiveIndex::_vidGrabber.grabFrame();  // get a new frame from the camera
+    
+    if (RefractiveIndex::_vidGrabber.isFrameNew())
+    {
+        RefractiveIndex::_pixels = RefractiveIndex::_vidGrabber.getPixelsRef(); //get ofPixels from the camera
+    }
     
     cout << "ShapeFromShadingAnalysis::saving...\n";
     

src/StrobeAnalysis.cpp

@@ -235,9 +235,15 @@ void StrobeAnalysis::draw()
 // this runs at save_cb timer rate = DELTA_T_SAVE
 void StrobeAnalysis::save_cb(Timer& timer)
 {
-
     _save_cnt++;
     
+    RefractiveIndex::_vidGrabber.grabFrame();  // get a new frame from the camera
+    
+    if (RefractiveIndex::_vidGrabber.isFrameNew())
+    {
+        RefractiveIndex::_pixels = RefractiveIndex::_vidGrabber.getPixelsRef(); //get ofPixels from the camera
+    }
+    
     cout << "StrobeAnalysis::saving...\n";
     
     string file_name = ofToString(_save_cnt,2)+"_"+ ofToString(_strobe_on) +"_"+ofToString(_run_cnt,2)+".jpg";