Texture2D.GenerateAtlas(Vector2[],int,int)

Parameters

sizes		An array of rectangle dimensions.
padding		Amount of padding to insert between adjacent rectangles in the atlas.
atlasSize		The size of the atlas.

void If the function succeeds, this will contain the packed rectangles. Otherwise, the return value is null.

Packs a set of rectangles into a square atlas, with optional padding between rectangles.