As described in this thread, subdivision is a fantastic tool to smooth meshes (considering you've the right amount of RAM
) but there are some caveats concerning corners or crisp edges as shown in the following image.
The back row shows the initial objects and the front row shows the same objects with a subdivision. The differences between the two cubes come from the initial subdivision of the sides. Note how those cubes are deformed with the subdivision. The top (and bottom) of the cylinder are kept intact because the sides of the cylinder are smooth.
So, the subdivision is perfect for hairs or already smooth surfaces (bodies are usually smooth too
) but be aware that you could destroy some objects if you want to enhance a mesh with subdivision. As the modification can't be undone under DAZ Studio (you get a warning), consider making a save before applying it.
PS : That's why good 3D manuals ask to avoid creating crisp edges and ask the user to create tiny bevelled edges instead. This makes meshes heavier but subdivision can be applied without any problem.