enable URDF loading throught the 'File/Open' menu

set a default camera targets for each demo. note that it is only reset when switching to a different demo, so you can restart at your chosen location.
no OpenCL pairbench drawing in OpenGL2 (there is no VBO available etc)

examples/CommonInterfaces/CommonRenderInterface.h

@@ -51,6 +51,10 @@ struct CommonRenderInterface
     
 	virtual void writeTransforms()=0;
     virtual void enableBlend(bool blend)=0;
+
+	//This is internal access to OpenGL3+ features, mainly used for OpenCL-OpenGL interop
+	//Only the GLInstancingRenderer supports it, just return 0 otherwise.
+	virtual struct	GLInstanceRendererInternalData* getInternalData()=0;
 };
 
 template <typename T>