I wanted to import a normal map with AO in it’s alpha. But it turns out that even with “Compress without alpha” disabled, the alpha channel still gets scrapped when the compression setting is TC_Normalmap.
I know it’s an unusual place for an AO map :), but I just wanted to create a Multi-Layer material with quite a lot of layers as an experiment and for this I need to minimize the number of texture samplers, even at the cost of memory. Why is it like that and can it be changed? Can the Alpha somehow adversely affect the compression or something?
Also, why even in a completely empty material with no textures and only scalar values are there still 3/16 texture samplers used?