Texture Maps: 4 Base Color Map, Channel Map, Normal Map, Packed Channel Map: Red channel for metallic, green channel for ambient occlusion, alpha channel for roughness. It is recommended to use the mochies shader for remapping texture channels, with metallic in R, roughness in A, and ambient occlusion in G. Alternatively, manually reassign channels in the texture import settings in Unity 2022. Standard Shader: Duplicate the texture; map the channels of the first texture as "R, 0, 0, A-1" for metallic input, and the second one as "G, G, G, 1" for ambient occlusion input.
