This takes a matrix of integers, and adjusts the values such that the minimal value is the 'target_min_index' value. It is used to adjust from 0-based to 1-based indices in meshes.
adjust.face.indices.to(faces, target_min_index = 1L)
3xn integer matrix, the adjusted values
3xn integer matrix, the vertex indices of the faces
integer, one of 1L or 0L. The target minimal value that the data should have afterwards.