OpenGL (cont'd) Setting the View



    # set the lookat point (view)
    glMatrixMode(GL_MODELVIEW)
    glLoadIdentity()
    vp = self.vp + (sgn * r)
    lookat = vp + self.vdir()
    up = self.vu
    gluLookAt(vp[X], vp[Y], vp[Z],
              lookat[X], lookat[Y], lookat[Z],
              up[X], up[Y], up[Z])
    self.display() # Execute drawing primitives