Imported SolidWorks surfaces not recognized by Hydrostatics command

Rhino
1

I’ve imported a SolidWorks file that contains 6 surfaces without gaps. The model is a boat design. Looking for help on what might be going wrong here. I’ve linked the file if that might help.
Autum Leaf_2.3dm (86.2 KB)

When I run the Hydrostatics command I receive the following error (I’ve included the import lines as well):

Opening the SW file
Command: _Open
Opened file: D:\Library\Documents\CAD_Files\SolidWorks_Projects\SOF Autum Leaf\Autum Leaf_2.SLDPRT

Part		 - Autum Leaf_2.SLDPRT

Successfully read file “D:\Library\Documents\CAD_Files\SolidWorks_Projects\SOF Autum Leaf\Autum Leaf_2.SLDPRT”
6 surfaces added to selection.

Moving the surfaces into position
Press Control to extrude, tap Alt to make a duplicate
Press Control to extrude, tap Alt to make a duplicate
6 surfaces added to selection.
Press Control to extrude, tap Alt to make a duplicate

Running the Hydrostatics command, Error on last line
Command: _Hydrostatics
Select surfaces or polysurfaces ( WaterlineElevation=0 Symmetric=No Longitude=X )
Cannot use these objects. Removing them from selection.

2

Join the surfaces and polysurfaces into a single polysurface.

Volume Displacement = 10666.8
Center of Buoyancy = 5.68017, -1.1056e-14, -1.49801
Wetted Surface Area = 4332.96
Waterline Length = 190.835
Maximum Waterline Beam = 25.7056
Water Plane Area = 3896.95
Center of Floatation = 5.62335, -7.22167e-14,0

Hydrostatics needs either a surface/polysurface with no naked edges below the water line (Symmetry=No)
– or –
a “half” surface on one side or the the xz plane with no naked edges below the water line except for the edges directly on the xz plane (Symmetry=Yes).

1 Like
3

Thanks! That did it.

I don’t use this command very often and forget the subtleties.