Surface Area

 From:  Syziph
388.1 
I just found out that it is possiblie to create a custom command in MoI, which is great!
Is there a link explaining how to create such commands.
I have two problems to solve:
1. I want to model a simple stone-like shape derived from three closed splines (placed in "gizmo" manner - one in X, one in Y and one in Z planes). My result is not what I've expected ( a smooth shape). I tried trimming, lofting, sweeping with one and two rails without any success. Only creating sphere in this manner produce smooth result (I know that there is sphere solid!)
2. I would like to calculate the area surface of that shape.
I hope you can help me!
Syziph