Ok! Here is the result of my tests with the Index: I see no difference at all. I’m used to HIGH, so I first tried LOW and then ULTRA, and this changes nothing whatsoever to the EFIS screens, and I can’t find any particular difference on the decals either. It might be possible some of the cockpit interior materials and fabrics are showing maybe a few more details but I’m not even sure of this. Either it doesn’t work on my system, or this setting works in tandem with another one I didn’t set like yours, or the Index resolution is lower and in practice it doesn’t show, or maybe it was just placebo, or actually my vision has become so poor I can’t distinguish any difference either. ???
Nevertheless, as far as I remember, this setting was supposed to only affect cockpit textures but more particularly, the cockpit texture overlay effect (this is the effect of recreating bumps and ridges on the plastics and the fabrics). It is not dissimilar in nature to the other setting, Texture Synthesis, except this one if I’m not mistaken is about the “details” on the ground.