import sys, math from PyQt4 import QtCore, QtGui, QtXml, QtOpenGL from constants import * from commands import * # check for the installation of PyOpenGL try: from OpenGL.GL import * from OpenGL.GLU import * except ImportError: app = QtGui.QApplication(sys.argv) QtGui.QMessageBox.critical(None, "OpenGL grabber","PyOpenGL must be installed to run this example.", QtGui.QMessageBox.Ok | QtGui.QMessageBox.Default, QtGui.QMessageBox.NoButton) sys.exit(1)