IES Lighting

This work has been done in 25 days as a contractor in order to implement an IES parser, and reconstruct the direct lighting shadowing term.

IES files are LUT that encodes radiance flux measured physically by goniophotometers in all directions.

I choose to use shaders to reconstruct the signal from LUT but one could even reduce this shader to be a single texture fetch if the signal is correctly reconstructed and splatted into a texture ready for indexing.

2 IES Lights

Yet another fancy luminaire attenuation