Surface to Tetrahedral Mesh

Does anybody know a way to generate a tetrahedral mesh from the surface of a geometrc object?

I only got 1D and 2D elements (nodes, lines, triangles) in 3D space and want to generate tetrahedrons out of it.

I know that it's not always possible, but I think it should be possible if the lines and triangles are building a valid surface.

Thanks for any hint....

[Mario Koddenbrock]

Okay, i found this:

Shewchuk, Jonathan Richard. "Constrained Delaunay Tetrahedralizations and Provably Good Boundary Recovery." IMR. 2002. ( PDF download. )