bool LoadSTL(){ //This function is used when a button is pressed
            bool rendered;
            canvas.ExecuteGL([&] { rendered = renderSTL(); });
            return rendered;
            
            // Maybe with template magic we could simplify to
            // return canvas.ExecuteGL([&] -> bool { return renderSTL(); });
	}

	bool rednerSTL() {
                // All methods calls from here could call to OpenGL... The same is true with lock approach...
                try {
                        //Context is here...
		        //Shaders Stuff
		        //OpenGL buffer filling and loading 
		        //Definition of draw
		} catch (Exc e) {
			Exclamation(DeQtf(e));
		}
		return false;
	}