The option turns on the spectral rendering mode. For convenience, duplicates the switch on the tab Quality Options.
Dali Renderer uses an AVX optimized HERO Wavelength extension for the continuous spectrum and includes special material versions for this. In spectral mode, the picture will be slightly different from RGB mode. This is due to the fact that all original textures and colors of materials are set in RGB. During rendering, they are somehow converted into a continuous spectrum with an infinite number of frequencies and, after rendering, converted back to RGB.
Fluorescence
This option is currently not available and will be activated in a future version.
Min wavelength, Max wavelength
Dali Renderer is not limited to the visible spectrum only. The spectrum can be expanded towards the infrared and ultraviolet regions. In this case, using fluorescent materials, it is possible to obtain complex effects of irradiation with invisible light with re-emission in the visible range. The initial data for the invisible range can be obtained from additional texture channels (up to 8 channels).
However, fluorescence is not currently available and will only be activated in future versions.
Max Texture Channels
The maximum number of color channels in textures (up to 8 maximum). Multichannel textures can be obtained from the supported JPEG2000 and OpenEXR formats. For each additional channel in the Channel splines table, a spline curve must be specified to convert this channel to spectrum.
Use Channel splines
Each of the splines corresponds to one of the color channels and determines the distribution function of the channel energy over the spectrum. The first three channels correspond to classic RGB (red, green, blue).
Smits for CIE1931
When this option is enabled, base RGB (red, green, blue) channels are converted to a spectrum using the well-known Smits Spectrum to RGB conversion algorithm. The first three splines from Channel splines are ignored.
RGB-CMYK Spectral composition
For the first three RGB channels (red, green, blue), an advanced color spectrum decomposition algorithm will be used. This is the recommended option.
Spectrum to XYZ conversion
Determines how to convert a continuous spectrum back to XYZ space and then to RGB. It is possible to use the built-in CIE1931 or CIE2006 profiles. Alternatively, arbitrary tabular data can be loaded.
