Basic fact: Light is linear
Double intensity of sources,
double photons reaching eye.
Turn on two lights, and photons reaching
eye are same as sum of number when each light is on separately.
This means we can render lights separatelyDouble intensity of sources,
double photons reaching eye.
Turn on two lights, and photons reaching
eye are same as sum of number when each light is on separately.
This means we can render lights separately