> For the complete documentation index, see [llms.txt](https://docs.enercalc.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.enercalc.com/e3d-training-manual/building-the-model/general-modeling-theory/editing-model-geometry/re-number.md).

# Renumber

How to renumber nodes, members, shells, and bricks for convenience and improved analysis performance.

**Modify > Renumber** offers a few ways to renumber entities in the model.

**Auto Renumber All Nodes** provides a quick way to automatically renumber all nodes in the current model. It provides control over how the renumbering is to progress with three dropdown list boxes that can be used to prioritize the process. This can be helpful because it allows the nodes to be renumbered, for example, in a way that generally progresses from top to bottom in the model, and then within a given level the renumbering will primarily flow from east to west and secondarily from north to south.

**Renumber Selected Nodes** provides two options:

* *Increment each selected node number* allows node numbers to be incremented by a user-specified amount.
* *Renumber each selected node* allows nodes to be renumbered starting at a user-specified start number and incrementing by a user-specified step.

**Renumber Selected Members** provides two options:

* *Increment each selected member number* allows member numbers to be incremented by a user-specified amount.
* *Renumber each selected member* allows members to be renumbered starting at a user-specified start number and incrementing by a user-specified step.

![](https://3750289988-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FlRZtG5Ynp58kYzLHYbR7%2Fuploads%2Fgit-blob-cd07f25b0868ccebf64f11b54cd03d36293eaf72%2FRenumber%20start.jpg?alt=media)

leads to

![](https://3750289988-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FlRZtG5Ynp58kYzLHYbR7%2Fuploads%2Fgit-blob-44b275a42c8f1818830147d4b3cfaa0886268cba%2FRenumber%20end.jpg?alt=media)

**Renumber Selected Shells** provides two options:

* *Increment each selected shell number* allows shell numbers to be incremented by a user-specified amount.
* *Renumber each selected shell* allows shells to be renumbered starting at a user-specified start number and incrementing by a user-specified step.

**Renumber Selected Bricks** provides two options:

* *Increment each selected brick number* allows brick numbers to be incremented by a user-specified amount.
* *Renumber each selected brick* allows bricks to be renumbered starting at a user-specified start number and incrementing by a user-specified step.

In general, renumbering can be useful for the user's convenience. But it can also improve calculation performance by reducing the amount of memory required to analyze a given model. Naturally, it is more significant in larger models and in situations where large spans of unused node numbers have developed through the model generation process and through deletions.


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