The theoretical aspects are discussed of our developed software, MeshToSS, for the conversion to Loop subdivision surfaces of dense triangular meshes. This software generates subdivision surfaces that approximate to their original mesh. The output is either a control mesh or its subdivided mesh applied to the Loop subdivision scheme. Our simple approach for the conversion is based on a well-known mesh simplification technique that applies a sequence of edge collapse operations. We show that this enables fast and flexible conversion to subdivision surfaces.