From what I can tell, the ability to set Secondary Textures from script now only exists in Editor on the TextureImporter. Yet SecondarySpriteTexture looks like it exists in the engine itself, so I am wondering if it is possible to expose a setter so I may assign them at runtime. Context: I'm generating spritesheets out of vanilla and mod sprites on startup. Secondary Textures are super-nifty for avoiding material swaps or thinking about materials at all. It would simplify a lot.