Heyo,
I was wondering if I can use both methods for UV unwrap at the same time. I have a model consisting of multiple objects and I'd like to unwrap all of them with cutting seams except for one. For this one I'd like to use smart unwrap but have everything on them same UV layout image in the right scale. Is this possible? Somebody knows how?
Cheers,
tobles
In edit mode, select only the faces/objects that you'd like to use manual unwrap. Then after that has been unwrapped, select the rest of the faces/objects and perform the smart uv project. And then you can just do what jamesley said, "Average islands scale", and "Pack islands".