How do you use SecondarySpriteTexture?

In 2019.1, SecondarySpriteTexture was added, but I can't find anything in the editor or any use of it. It sounds intriguing, but how does one use this?

• TextureImporter.secondarySpriteTextures, which lets you assign secondary textures to a texture asset imported as Sprite

What does the secondary sprite texture do?

 

I guess it is just a way to make multiple sprites related to one main sprite with no specific purpose.. (no even Editor presentation anywhere, I see that the only way to confirm is by looking at the meta file) maybe it's up to you to use the importer to query them back and do something. This could be useful for external tools to express sprite hierarchy to Unity in the case of multiple sheets. (In which that external tools has a custom Unity inspector that knows to read back the secondary textures)



(Maybe) all would be included in the build even if they are not used given that your main sprite was used somewhere because the build will scan all GUIDs in the meta? Not sure. EDIT: Yes I confirmed it is the case. I have only used main.png in the scene as Image's Sprite :

 

Huh...alright. I'm still pretty confused as to its use, but thank for you the info! Perhaps it's for something down the road.

 

I just noticed there is an editor over here (2019.2)