don't initialize the vtScene until an OpenGL context exists
don't initialize the vtScene until an OpenGL context exists

seanisom/vtp,nakijun/vtp,markraz/vtp,seanisom/vtp,seanisom/vtp,markraz/vtp,markraz/vtp,nakijun/vtp,markraz/vtp,markraz/vtp,seanisom/vtp,seanisom/vtp,nakijun/vtp,nakijun/vtp,nakijun/vtp