Now go into the sprite editor, assign the normal maps as a secondary texture, and make sure the name is the same as in your shader, _NormalMap (or something else, as long as it's the same).I wrote blog post about it here: Key is setting secondary sprite textures array of texture importer: Sprite Editor: Secondary Textures - Unity Manua texture: The texture to be used as a secondary Sprite texture I created small utility, that sets secondary textures in batch for all selected sprites. Use this name to identify and sample the texture in the shader. Each added Secondary Texture appears as an entry on the list, with two fields: Name and Texture The shader property name of the secondary Sprite texture. You can add a maximum of eight Secondary Textures to each Sprite or Sprite Sheet. Adding a Secondary Texture To add a new Secondary Texture entry, select the ''+'' at the bottom right of the Secondary Textures panel. If you are used to working in 3D, Sprites are essentially just standard textures but there are special techniques for combining and managing sprite textures for efficiency and convenience during development. The Sprite Editor's Secondary Textures module can associate additional Textures with edited Sprites A 2D graphic objects. Suggested names remain in the drop-down menu even after their associated. The drop-down arrow to the right of the Name field displays a list of valid suggested names.
Some Unity packages suggest Texture names that can be used with their Shaders. You can enter a custom name for the Secondary Texture in the Name field. Each added Secondary Texture appears as an entry on the list, with two fields: Name and Texture.
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