(add-camera-scene-node! scene-manager #:position '(0 30 -40) #:lookat '(0 5 0))
;; draw everything
-(while (device-run? device)
+(while (run device)
(begin-scene driver #:color '(255 100 101 140))
(scene-draw-all scene-manager)
(gui-draw-all gui-env)