zurich-tower2.ac material Fenster /sim/time/sun-angle-rad 1.57 1.0 1.0 1.0 material Fenster /sim/time/sun-angle-rad 1.57 0.0 0.0 0.0 material Positionlight /sim/time/sun-angle-rad 1.57 1.0 0.0 0.0 material Fenster2 /sim/time/sun-angle-rad 1.57 0.8 0.8 0.4