The Material comes with some short descriptions for some Nodes.

I also included a short python script to apply optimal render settings.

Just run it inside blender and you'll get the best settings for the most realistic results with overcast pro.

To use Overcast Pro in your scene, you can simply append the "00_Overcast Pro [Version 1.X]" into your scene.

If you don't see anything in your viewport or camera, change the render distance " clip end " to at least 10 km.