F1 - Default View
F2 - Scattering-only View
F3 - Wireframe View

F4 - Toggle Fullscreen

Space - Pause animation

V - Toggle Viewer Position
L - Toggle Light Type (Spot, Point, Directional)
O - Toggle Medium Type (Very Clear, Humid, Hazy, Murky)
P - Toggle Light Power (Medium, Low, High, Red, Green, Blue)
D - Toggle Downsample Mode (Full-Res, Half-Res, Quarter-Res)
M - Toggle MSAA Mode (1x, 2x, 4x)
U - Toggle Upsampling Mode (Point, Bilinear, Bilateral)