start of URDF parsing (extremely preliminary)

btgui/OpenGLWindow/GLInstancingRenderer.cpp

@@ -1311,6 +1311,10 @@ void writeTextureToPng(int textureWidth, int textureHeight, const char* fileName
 
 void GLInstancingRenderer::renderScene()
 {
+	//avoid some Intel driver on a Macbook Pro to lock-up
+	//todo: figure out what is going on on that machine
+
+	glFlush();
 
 	if (useShadowMap)
 	{

btgui/OpenGLWindow/SimpleOpenGL3App.cpp

@@ -319,6 +319,7 @@ int	SimpleOpenGL3App::registerGraphicsSphereShape(float radius, bool usePointSpr
 	return graphicsShapeIndex;
 }
 
+
 void SimpleOpenGL3App::drawGrid(DrawGridData data)
 {
     int gridSize = data.gridSize;

btgui/OpenGLWindow/SimpleOpenGL3App.h

@@ -41,7 +41,7 @@ struct SimpleOpenGL3App
 
     void dumpNextFrameToPng(const char* pngFilename);
     void dumpFramesToVideo(const char* mp4Filename);
-
+    
 	void drawGrid(DrawGridData data=DrawGridData());
 	void swapBuffer();
 	void drawText( const char* txt, int posX, int posY);