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Second atlas page seems to ignore Premultiply Alpha checkbox?

Darkop

I've been adding skins to one of my skeletons and it now has two atlas pages.

The Premultiply Alpha checkbox is checked in Spine:

But in Unity, I see an issue (these horizontal lines coming off the edge of the skeleton) which as per https://esotericsoftware.com/forum/d/3132-premultiplied-alpha-guide/2 is related to straight vs premultiplied alpha:

If I check "Straight Alpha Texture" on the _2 material, then the artifacts go away:

But I'm confused as to why checking this is necessary. Shouldn't the second atlas page for this skeleton also have premultiplied alpha?

Edit: turns out this was because my _2 PNG had "Alpha is Transparency" checked. Unchecking that fixed the issue

Misaki

Could you please make sure you have set correct template materials to Additive Material, Multiply Material, and Screen Material in Preferences - Spine? The correct settings for importing PMA textures are shown in the screenshot below.

For more information, please see the Advanced - Premultiplied vs Straight Alpha Import section on the documentation:
http://esotericsoftware.com/spine-unity#Advanced---Premultiplied-vs-Straight-Alpha-Import

Darkop

Thank you @Misaki !

The materials seem to be set up correctly like your screenshot.

It appears the problem was that my _2 PNG for this skeleton had "Alpha is Transparency" box checked in Unity. This skeleton didn't originally have 2 PNGs so I had a few issues when a second one was added - the issue probably occurred at that time.

Harald

Thanks for reporting with the detailed info and sorry for the troubles!

We could reproduce that a later added texture atlas page does not get the texture preset applied automatically. We have created an issue ticket here for you to subscribe:
EsotericSoftware/spine-runtimes2266
We will let you know once this issue has been resolved.

Harald

We have just released a bugfix on both 4.1 and 4.2-beta branches. Updated spine-unity unitypackages are available for download here as usual:
https://esotericsoftware.com/spine-unity-download
Thanks again for reporting!