Hi Žydrūnas!

**Žydrūnas wrote:**
... it writes "mesh not converted because its__ not closed __or self intersects".

But you don't tell us if you thought of closing the surface or not.

Did you try to quickly draw a transom and a deck?

I assume AutoCAD needs the surface to be definitely closed before changing it in volume, otherwise there'll be leaking points and the calculation will be impossible. (Note: Delftship has the tool to check the surface/leaking points).

I'm not 100% sure, but I guess you can check for the center of buoyancy with heeling angle using Delftship. I already mentioned this possibility (with a question mark) in a discussion bout lateral stability for asymmetrical hull:

http://www.delftship.net/DELFTship/index.php/forum/hydrostatics-and-stability/3708-heeled-waterlines-and-calculating-righting-moment#4856 (Can a competent member of this forum tell me if I'm right?) .

The idea was to rotate the model 90° on a vertical axis, thus the lateral stability will be inverted with the longitudinal one. Then giving the model a pitch angle (which can be calculated) will be like giving it a heeling angle (which can't be calculated... theoritically) and the longitudinal stability result will have to be considered as being the lateral stability result.

... I hope it's clear...