Version: 2019.2
public SpriteMeshType spriteMeshType ;

Description

SpriteMeshType defines the type of Mesh that TextureImporter generates for a Sprite.

When SpriteMeshType.FullRect is specified, it will generate a rectangle Mesh equal to the user specified Sprite size.

When SpriteMeshType.Tight is specified, it will generate a tight Mesh based on pixel alpha values.