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Multiplexed Spectral subsampling

Alban Fichet requested to merge af_spectral_subsampling into master

This merge request enable rendering without spectral aliasing.
This is the phase 1 of the subsampling implementation.

Example with sampling each 50nm:

Reference No spectral subsampling With spectral subsampling
ref old_50 new_50

Future:

  • Subsampling for a single wavelength (-wpp 1)
  • Pre-integration on the spectrum to get better integration result (e.g. case of a spiky spectra within the boundaries -> in such scenario, the spike can be under estimated if sending a single interpolated value)
  • Keep track of the energy computed for the upper bound when several spectral passes are performed (needs important discussion and refactoring).
Edited by Alban Fichet

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