Ball of Light (Light, Material?) glutsolidsphere

问题

I'm programming a game which is called Falldown. I'm almost finished; now I want to design the ball. How can I light this ball such that it glows like these examples?

I created my cube with glutSolidSphere and ask myself how I can light the ball.

void ball()
{
    glColor4f(0, 0, 0.5, 0.5);
    glutSolidSphere(0.25,40,40);        
}

void initLightSources()
{
     ?????? 

     glEnable( GL_LIGHTING );
     glEnable(GL_DEPTH_TEST);
     glEnable( GL_LIGHT0 );
}

来源：https://stackoverflow.com/questions/23938836/ball-of-light-light-material-glutsolidsphere