To unwrap 3D models with opacity, texture artists should isolate transparent/translucent parts into separate UV islands—this ensures opacity maps align correctly without issues.
Separating these islands prevents alpha channel stretching or overlap with opaque areas, making it easier to paint textures for glass, leaves, or sheer fabric.
For complex opacity (like layered materials), use UV packing tools to group transparent islands. Preview in-engine early to tweak spacing for realistic transparency.