Thanks, TheGabmeister. But, If I had 3 base materials and their has 2K or 4K texture's resolution. I can combined the height/roughness/metallic/ao maps in one texture for each material. So I need preparing 3 base colors, 3 normals, 3 combine texutres. right? It has 9 textures of 2K or 4K. Does it cost more memory cost?