Dear Xu you need also to have the license for Exceed OpenGL implementation. but I am not sure it is 100% compliant with GLX and GL > > Xlib: extension "GLX" missing on display "philsner:0.0", > ERROR: In vtkOpenGLRenderWindow.cxx, line 182 > vtkOpenGLRenderWindow: Could not find a decent visual. > cheers ~sathya