Packs multiple small textures in a single, bigger one. Helps to optimize video memory costs and render calls. [Texture] resource aimed at managing big textures files that pack multiple smaller textures. Consists of a [Texture], a margin that defines the border width, and a region that defines the actual area of the AtlasTexture. The texture that contains the atlas. Can be any [Texture] subtype. The margin around the region. The [Rect2]'s 'size' parameter ('w' and 'h' in the editor) resizes the texture so it fits within the margin. The AtlasTexture's used region.