Creates a pixel pyramid with separate uniform colors for the cubemap-Y faces.
Usually, this method is used to create a pixel pyramid that fills holes at the North and South poles (e.g. Mercator voids).
Fields / Required
The size of the bottom-most pyramid level, in pixels. Will be round up to the next power of two.
The uniform color value for Face.NegY. This is usually the North pole.
Fields / Optional
The uniform color value for Face.PosY. This is usually the South pole.