By default the background of a rendered scene is black. To change this, you need to create a game object in the scene and attach a sky component.

SkyBox component

The SkyBox component implements a simply sky, which displays a cubemap texture as a static background. The position and scale of the game object has no effect on the sky, it will always appear behind all other geometry. The rotation, however, can be used to orient the sky as desired.

See Also