Trapped null geodesies in a rotating interior metric

We consider trapped, null geodesies in an interior, rotating metric which matches the Kerr metric on a spheroidal surface. The interior metric is unphysical, but still useful for obtaining a qualitative understandng of the properties of the trapped, interior geodesies. We find, by numerical techniques, that the presence of rotation increases trapping for count-errotating orbits, but decreases it for corotating orbits.