Hi there, I'd like to use the glut functions from the tutorials (e.g. glutDisplayFunc, glutReshapeFunc, a.s.o.) in combination with member functions. For example I've created a viewer class, whose objects should contain the method that I want to be called by glutDisplayFunc: void viewer::start(int argc, char** argv) { (...) glutDisplayFunc(DrawGLScene); (...) } GLvoid viewer::DrawGLScene(GLvoid) { (...) } DrawGLScene here ist a public member function in the viewer class. The compiler tells me, that the argument of type 'GLvoid (viewer::)()' doesn't match 'void (*)()' I'm really a blockhead, so has anyone an idea how to solve this issue? Thanks a lot. darkurizen EDIT: I forgot to mention that I'm coding in C++ on a Mac ;)

You can't pass a pointer to a member function where a pointer to a free function is expected. The only function pointers which can be passed to glutDisplayFunc are those for free functions and static member functions.

Thank you, I marked the functions static and now it works.

Sort of obvious, but I was somehow blind ;)

Thanks.