I have the same problem with "Import Error: UV Set UV0 contains no data!" message. I've tried demo on my model, but here is simple scene, only 6 boxes, that is giving me this message as well. https://www.dropbox.com/s/52gcrv1pqivw7xb/UV0_test.obj?dl=0
Thanks for your answer :) There's no UV islands outside of the 0-1 space, I've left some big empty spaces on purpose to have a better view of the differences and the non cohesive results. Here is where some parts have been moved and unfortunately as we can see "rescaled" even if it's not the right term. Thanks
@god3ila The packer is not scaling up or down individual uv shells. The imported uv islands are always scaled up and down together. So the texelratio between all uv islands will always be the same. Maybe the problem occurs now, because each uv island got more texeldensity now (from 30% coverage to 10%) So the different…