SpriteAtlasExtensions.SetMasterAtlas

public static void SetMasterAtlas (U2D.SpriteAtlas spriteAtlas, U2D.SpriteAtlas value);

Description

Set an atlas to be the master atlas.

Setting a valid master atlas will not turn this into a variant Sprite Atlas. You have to use SpriteAtlasExtensions.SetIsVariant to make it a variant.