The Easy Environments series for Daz Studio and Poser combines high-res 360° Skysphere/HDRI backgrounds with terrain geometry to place your characters on.
Autumn Hills presents a lovely landscape below a cloudy sky.
The wheel-trails on the path are a morph, you can dial it in or out.
The soft rain is a prop, you can hide or remove it. It skips the places below the trees.
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 a separate preload).
You can get additional info and tips here: http://flipmode3d.com/easy-environments/#AutumnHills