.B \-fog | \-no-fog
Render in fog.
.TP 8
-.B \-fps | \-no-fps
-Whether to show a frames-per-second display at the bottom of the screen.
+.B \-fps
+Display the current frame rate, CPU load, and polygon count.
.TP 8
.B \-light | -no-light
Whether the scene is lit.