SkyGen is a skymap generator tool to be used with DAZ Studio to create HDR latitude/longitude maps for use in IBL and reflection mapping. SkyGen is not a set of preset sky maps but rather a tool to let you create a sky with an interactive interface. Place your sun base on time and location and given 'haze' --the possibilities are limitless.
SkyGen is intended to be used with UberEnvironment Light Shader to provide image based lighting. The generated maps can also be used with HumanSurface as reflection maps.