Hi everyone.

I've been trying to read an .atlas file and I've noticed a recurrent "index: -1" value.
Does anybody know what that means?

Thanks in advance!

arm lx shoot 2
rotate: false
xy: 282, 35
size: 61, 33
orig: 61, 33
offset: 0, 0
index: -1

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This atlas format is actually the libGDX atlas format, but almost all Spine runtimes that can use atlases use it.
index is used by libGDX for image sequences.
0 means it's the first frame in a sequence.
-1 means it's not part of a sequence.
At least, that's what I understand from it.
Currently, this isn't used by Spine. But it's there because it's part of the libGDX atlas spec.

Spine atlas doc: Atlas export format

All clear!
Thank you so much Pharan ^^