How to select objects with NEG volume ?

[ggaliens]

Object with negative volume is very simply ... likely inside-out or has some HOLES.

Wings3D is a very good tool for analysis. Often when I import objects form other packages ... they are not "watertight". I doubt I'm the only one experiencing this.

I use Wings3D as a beautification tool, a vetting tool, etc in more complicated workflows.

Right now ... I want to import a few items from Surface evolver.

OORT ... Sea-Shells might ultimately import with near sero volume ... depends on whose shells they are.