Create or select an object. > Modify panel > Modifier List > Patch/Spline Editing > Edit Patch
Create or select an object > Modifiers menu > Patch/Spline Editing > Edit Patch
The Edit Patch modifier provides editing tools for different sub-object levels of the selected object: vertex, edge, patch, and element. The Edit Patch modifier matches all the capabilities of the base Editable Patch object, except that you cannot animate sub-objects in Edit Patch. See Editable Patch for a complete parameter reference.
When possible, itÆs far more efficient and reliable to perform explicit editing at the Editable Patch level rather than store those edits within the Edit Patch modifier. The Edit Patch modifier must copy the geometry passed to it, and this storage can lead to large file sizes. The Edit Patch modifier also establishes a topological dependency that can be adversely effected if earlier operations change the topology being sent to it.
There are, however, situations where using the Edit Patch modifier is the preferred method.
You want to edit a parametric object as a patch, but want to retain the ability to modify its creation parameters after the edit.
You want to store your edits temporarily within Edit Patch until you are satisfied with the results, before committing them permanently to an editable patch.
You need to make edits across several patch objects at once, but do not want to convert them to a single editable patch object.
You have a modifier in the stack that must stay parametric, and the resulting patch must be edited after the modifier is applied.