Sort sprites

Unity’s Graphics settings (menu: Edit > Project Settings > Graphics) provide a setting called Transparency Sort Mode, which you can use to control how to sort sprites depending on their position in relation to the Camera. More specifically, it uses the sprite’s position on an axis to determine which ones are transparent compared to others.

An example of when you might use this setting is to sort spritesA 2D graphic objects. 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. More info
See in Glossary along the y-axis. This is quite common in 2D games, where sprites that are higher up the y-axis are sorted behind sprites that are lower, to make them appear further away.

Notes:

• If you set the Transparency Sort Mode to Custom Axis, you also need to set the Transparency Sort Axis.

• If the Transparency Sort Mode is set to Custom Axis, renderers in the SceneA Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More info
  See in Glossary view are sorted based on the distance of this axis from the cameraA component which creates an image of a particular viewpoint in your scene. The output is either drawn to the screen or captured as a texture. More info
  See in Glossary. Use a value between –1 and 1 to define the axis. For example: X=0, Y=1, Z=0 sets the axis direction to up. X=1, Y=1, Z=0 sets the axis to a diagonal direction between X and Y.