Hi Misaki,
Yeah the poly texture packing was exactly what I was referring to before.. thanks for the link :yes:
in my particular situation I have an image sequence where all the images are set to be the same size when importing them into spine. I'm using the sequence feature (which i assume is using a linked mesh) for some reason I was expecting that on export (with poly packing and white space trimming enabled) that spine would be able to trim the whitespace knowing where not to view the overlapping uvs from the atlas.. although thinking about it now im not sure if its possible, maybe if I used separate meshes for each frame? but that wouldn't work for my purpose so for now im disabling 'white space trimming' unless you know of a better way?
update
So I thought i'd try creating the sequence using individual mesh layers (not using the new sequence feature or linked mesh) and it exports fine but seems to be ignoring the white space trimming.. I guess because its not supported on mesh. which would answer why we've never seen an issue before I guess 😃