Whether your game is going to be 2D or 3D, you will deal with a number of 2D assets, mainly textures. Therefore, before building a game, I will cover this topic and explain how textures and other 2D assets are dealt within Unity.
Though we assume you are familiar with texturing-related matters and image file formats used for texturing games, we are going to describe the most relevant aspects of the operations throughout this chapter.
Some could say that textures should have been covered before importing 3D models into Unity. As a matter of fact, when you export a model from a 3D editor like Maya, the exporting process takes care of setting references between the exported model, its material, and the textures for those materials. Once the model is imported, the material instances are recreated in Unity; if the textures for those materials have already been imported into the project, the materials can actually be read by Unity and the model will (almost) look like it did in Maya...