. Finished implementing (lamely duplicating really) the precomputed multiple-scattering shaders from Bruneton's paper
 => It compiles and runs (actually, the computation is instantaneous but the compilation is not! ^^)
 => Still need to UNDERSTAND each stage and debug the whole thing
 => That's basically not difficult at all but Bruneton's paper is especially cryptic (!!) using all mathematical symbols known to man for the sole purpose of... confusing the reader?