That leaves the uvs for the yellow faces separated from the uvs for the green faces like in the third image. If that’s not possible, I can make it work if the yellow part uvs are rotated in the same direction as the green part uvs.
Yeah, i guess i was reading all over the sentences… However inside usually is different from the outside material.
You can rotate any UV island separately of course. L selects like in 3d view. Dunno if some stitching or welding might help and that’s a lot of manual work anyways.
You don’t say much about what exactly you put on UVs: join shards temporarily and use smart project. I already know that’s not the option due to whatever reason…But when you separate them again by loose parts each will have this UV map. And maybe selecting faces and mask/stencil 3d painting would help.