The Easy Environments series for Daz Studio and Poser combines high-res (12000x6000) SkySpheres/HDRIs with terrain geometry.
The terrain makes sure your character has something to stand on, while the SkySphere/HDRI provides full scene coverage and great vistas.
ExoPlanet III is a planet mostly covered in water, with scattered rocks brushed by rain storms. It`s well suited for scifi or fantasy renders.
The rain (as seen on the previews) is part of the set. The prop can be hidden if you want to go for a calmer scene.
The file formats are native .DUF for Daz Studio 3Delight and Iray, and .PP2 for Poser.
Lighting is included for all versions (Iray through the HDR environment, 3Delight parented to the skysphere, Poser as separate preload).
You can get additional info and tips here: http://flipmode3d.com/easy-environments/
Poser 10 / Poser Pro 2014 +, Daz Studio 4