

The metal Materials I've been trying that don't work aren't dissimilar to those that do, in fact only the colour is different. I have (or thought I had.LOL) a reasonably good understanding of how PBR materials works, I just don't understand why some are not working as expected in Flight Sim World? When using other 3d engines such as Unity or Unreal the materials work perfectly, even using the same outputted texture maps.

Thanks for taking the time to compile those links Gilles_Sim, I have unfortunately seen the majority of them.
