Stretched images in spine works perfectly but it causes glitches in unity.

Nommalorel

Hi. I am working in a mobile game company and i have to prepare game assets that has to work in unity. For optimisation purposes we cut down the useless parts of the images and stretch the parts together so that they still look pretty much the same with the finished product but also having way less atlas dimensions which is good for optimisation.

However. It has caused a visual glitch in unity where the stretched edges end up having weird "shadows" on them which causes the "seamless look".

Here i prepared an example that has the same problem as i described above. Unfortunately i cannot show the actual asset.

Spinebot

The issue you're experiencing with visual glitches in Unity when using stretched images from Spine is likely related to how the textures are being handled in Unity. One common cause of such artifacts is the use of premultiplied alpha settings. If your textures are exported with premultiplied alpha, but Unity is not set up to handle them correctly, it can result in unwanted shadows or outlines. To resolve this, ensure that your Unity project settings and materials are configured to use premultiplied alpha if your textures are exported that way. Alternatively, you can try re-exporting your textures with straight alpha and adjust the material settings in Unity accordingly. Additionally, consider using the "Bleed" setting during export to help mitigate edge artifacts.

Nommalorel

Spinebot I tested with exporting without checking the "premultiply alpha" this time and the issue persists.

Harald

@Nommalorel Please note that inside the Spine Editor you see single images displayed, while in Unity the packed atlas texture is used for rendering. Please make sure that your export and import settings are correct, as described here in the FAQ and here in the documentation.

If export and import settings match, then I would suspect that you haven't added enough padding around your atlas regions, so neighbour region pixels appear during texture filtering. Please have a try whether re-exporting your atlas with increased padding resolves your issue:
https://de.esotericsoftware.com/spine-texture-packer#Region-padding

Nommalorel

Harald Thank you so much!

The first part you told about it was not relevant since the export and import settings are correct.

The padding was irrelevant too. I tried increasing and decreasing but it did not change anything. However. I went to the link you provided and tried "Duplicate padding" and it works perfectly now! Thank you so much.

Harald

@Nommalorel Glad to hear you've figured it out, thanks for getting back to us!