On Thu, Jan 17, 2013 at 11:02 AM, Roy Stogner <roystgnr@ices.utexas.edu> wrote:
For unions of linear simplicial meshes you can just turn each
polyhedron into more simplices; not a great idea if it was going to
effect basis conditioning but just fine if it's only used for
integration.

But that's not even the real tricky case: For unions of higher order
simplices (or *any*-order hexes/prisms/pyramids) the geometric union
can include *lenses* and even nastier shapes; I can't even imagine the
right way to handle that.

Yep - right now they only support linear meshes.  However, they do also have a geometry engine (CAD style) that can support arbitrary geometry.  We'll see where this goes.
 
Derek