Hello,
@ChrisBrejon post above got me itching so I “forcibly” found some cycles to create those images that I was meant to do for a long while (I would also like to shoot some skin references against the LED Wall). They are spectrally rendered using Mitsuba 3 using the Standard Human Observer. The 6 first columns are the primaries and secondaries of BT.2020 using gaussian SPDs (10 FWHM), i.e. 630nm, 571nm, 532nm, 493nm, 467nm, 630 + 467nm, the two last columns are 400nm and 700nm, bordering the visible spectrum. The SPDs have been normalised against the luminous flux of a similar gaussian SPD at 555nm but it is obviously not enough for them them to be equally bright. Next step is to render them using a virtual camera to generate physically non-realisable values and maybe address the brightness.
- EXR file, subject to change, in-place, is here: Spectral_Cornell_Boxes.exr - Google Drive
- colour-mitsuba : GitHub - colour-science/colour-mitsuba: Various resources for Mitsuba 3
Many things to discuss, maybe tomorrow!
Cheers,
Thomas
Edit: I need to check if the PNG files are properly encoded and I need to write back the EXR file in 32-bit as it clamps.