Instead, patches, as their name implies, are built-in sections that connect together to produce a smooth surface
. Patches do require a somewhat different modeling thought process. Building patches can be done in one of two ways: through Patch surfaces or primitives. Primitives give you the ability to start with a more complex shape from which to build. For instance, building an arm from a patch cylinder is much easier than building from a series of Quad Patch objects and free 3d model.