Hi Igor, I currently have two students who are very motivated in working with the open gl binding. However we are experiencing stability problems. Last week I created a moose image with NBOpenGL and SourceCity and it worked well "SourceCity exampleRpackage" gave me the beautiful visualization. Today I cannot open the image anymore. I got the diabolic error "Could not find accessor for variable named "aModuleName" in NativeBoost." I have attached a .log file. Do you have any idea what is going on? Are there some resources that are not freed when I saved my image? How can I reset them? Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.