Controls:
W/A/S/D/Q/E to modify camera's origin,
UP/LEFT/DOWN/RIGHT arrow to modify camera's concentration point position,
1/! to increase/decrease the field of view,
2/@ to increase/decrease the aperture size,
3/# to increase/decrease the focal length,
D to toggle enhanced debug display (3x2 grid with temporal history),
V to show detailed ReSTIR debug information,
C to center debug divider (when in debug mode),
Mouse drag to adjust debug view in grid mode,
SPACE to reset camera,
R to reset view direction,
Esc to stop