I have battled this problem for quite some time and have yet to find a suitable solution. How would you join these two solids or surfaces? This is intended to look like liquid mercury spilled out on a surface. I have probablly tried 20 different ways and every solution I come up with ends up with some kind of major kink/wrinkle or very non-liquid looking shape in the surfaces.

Here is a typical cross section:

Thanks for considering this difficult problem.

As a next try I would use Chris's 3D sketch along with my additional surfaces. Attached is a quicker way to create the surfaces that uses Chris's 3D sketch, extend face, boundary surface and a fill. I hope this helps.

Rob Stupplebeen