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dshernan

What exactly do you mean by "without change in frequency?" Isn't the light reflected off of these surfaces reflected with different wavelengths (i.e. frequencies)?

large_monkey

Since light is reflected without change in frequency, how does reflecting light off of a surface cause its perception to be different? I assume then that this would have to do with other factors.

jonasjiang

Do we need to take the incident angle into account? It seems we need this angle to calculate the out radiance

ddkim

Are there a set of reflection functions that are most commonly used?