Douse a mesh in rain and fill all depressions.

Input parameters:

1. Ms → Mesh to douse.
2. Rs → Output surface type.
   • 0 → Shores
   • 1 → Dry Parts
   • 2 → Top Surface
   • 3 → Projected Top Surface
   • 4 → Lake Tops
   • 5 → Lake Bottoms
   • 6 → Lake Volumes

Output parameters:

1. Ms → Mesh results of pooling analysis.
2. Lk → Boundary curves of all shores.