How can I loft 4 curves (one at top, one at left side, one at right side and one at the bottom) together like #18 in this tutorial http://www.highend3d.com/maya/tutorials/patch/ ?
use boundary tool or square tool to make up the surface for those 4 curves that should do it make sure all curves are touching each other i mean vereces other wise you will not get sucessful results or it won't work at all