I've been messing around lately with LOD's and my main problem at the moment is being able to maintain normal map information on the lower LODs shared UV's. I've noticed that when optimising using the target weld option effects how the normal map look on the LOD, for example sometimes it creates artefacts, where as,…
my only worry with that is that with bigger models I could be spending more than an hour optimising it, and since transfer attributes looks as thought it can be only done at the end, it's not something I'd want to be gambling with. Ideally I'd want more control over the optimisation, being able to careful optimise my model…
I think that the lower LODs will always have deformed map information, not much you can do about it unless you have a unique map for the lower LODs (but a lot lower resolution). But I basically avoid using target weld as much as I am able. If I want to move verts together, I find that often the normal map will deform less…