TetGen generates tets for empty chambers/holes in a model

I am using tetgen to generate meshes for my research.My models have empty internal chambers inside them. For example, an empty box of size (5,5,5) inside a box of size (10, 10, 10). See image:The problem is that tetgen generates tetrahedrons inside the empty chamber. Why? Is there a way to avoid it?I tried using -YY, -q, -CC, -c, and their combinations, but all had the same problem, and did not give insight on the error. (http://wias-berlin.de/software/tetgen/1.5/doc/manual/manual005.html).If not, I will try to grammatically eliminate these tet...Read more