Entity Sets and History

Save reusable selections and navigate document state with undo, redo, and rollback.

Entity sets and history make MeshTools practical for longer editing sessions.

Entity Sets

An entity set is a named saved group of faces, edges, and points.

Create one

Select entities in the viewport.
Use Add to Entity Set.
If no sets exist yet, MeshTools creates a new one automatically.
Otherwise, you can choose New Entity Set or append to an existing set.

Manage sets

Click an entity set in the scene tree to select its members.
Double-click its name to rename it.
Renaming ignores empty names and leaves unchanged names alone.

What entity sets are good for

preserving regions you will revisit,
building edit targets incrementally,
capturing selection results from Expand Selection,
grouping work before saving a project.

History

History records document-changing actions such as:

opening or importing a document,
changing project up axis,
creating or renaming entity sets,
modify operations.

Ways To Move Through History

Control	Result
`Undo`	steps backward on the active branch
`Redo`	steps forward on the active branch
Rollback slider	jumps along the current branch
History tree	jumps directly to a chosen node

Restoring an older node rebuilds the mesh state and then refreshes topology caches.

What History Does Not Mean

History is session state. It is not currently saved into the .mt project archive. When you reopen a project later, you start with a fresh history rooted at the open event.