Cycles Spectral Rendering

[Eary_Chow]

@CarlG

I was speaking for “most of us”, not “everyone”. There will always be the outliers doing office spaces and then trying to battle realistic lighting from fluorescent lights looking bad.

@CarlG

photographers do everything in their power to hide it,

I am not sure we are talking about the same thing? Does it make sense for if a person wearing red clothes standing under green light looking like they are wearing a black clothes? Does a blue car under red light looks like a black car in real life? Would a photographer deliberately grade their blue cars under red lights to black? Are we even talking about the same thing here?

@CarlG

I think the point is there don’t exist texture data for spectral absorption.

First of all there actually are openly available databases for spectral absorption, @kram10321 had done some test against the 2.93 version of Spectral Branch back when spectral nodes were there.

But the important part is, again, you don’t need to use spectral data if you don’t want to. RGB textures will always be reconstructed into spectra under the hood before they are fed to Spectral Cycles, your user experience will basically be the same as before.

@Debuk

Another thing is that more calculations have to be done during rendering, so another drawback is an increase in rendertime.

Actually with the help of Hero Wavelength Sampling, the performance impact has been minimized so it will not be that big of a deal.