With patch modeling, you can create objects that look mesh-like but whose surface curvature can be controlled with handles, like splines. You can create a patch model with built-in patch grids, and can convert most objects to patch format.
Editable Patch provides controls for manipulating an object as a patch object and at five sub-object levels: vertex, handle, edge, patch, and element.
You can create two kinds of patch surfaces in grid form: Quad Patch and Tri Patch. Patch grids begin as flat plane objects but can be modified into arbitrary 3D surfaces by either using an Edit Patch modifier or collapsing the grid’s modifier stack down to an Editable Patch in the Modify panel.
