> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Can I turn a closed curve into a profile?

## Question:

Can I turn a closed curve into a profile?

## Applies to:

* Implicit modeling
* Modeling
* nTop 5.20

## Answer:

Yes, you can use the **Profile from Curves** block to create closed profiles from input curves.

![An example of an open profile in nTop. The Profile from Curves block has a warning icon that alerts the user that the profile is open.](https://files.learn.ntop.com/help-articles/implicit-modeling/40340084056339.png)

![An example of a closed profile in nTop. The Profile from Curves block doesn't have a warning icon because the profile is closed.](https://files.learn.ntop.com/help-articles/implicit-modeling/40340084067987.png)

A **Profile** is a set of coplanar curves. It has two field properties: the first is the Signed Distance field to the infinite extrusion relative to the profile's plane and the second is the unsigned distance field to the enclosed region.

![](https://files.learn.ntop.com/help-articles/implicit-modeling/40340084070291.png)

*Profile field properties, from left to right: distance to extrusion, distance to region.*

A **Profile** can also be closed or open. If closed, it can have multiple loops (e.g. several circles inside a rectangle or the disconnected loops of a logo). Open profiles are semi-infinite and can be used in the same blocks as closed profiles.

![](https://files.learn.ntop.com/help-articles/implicit-modeling/40340084070803.png)

*Three Profiles, from left to right: closed, closed with multiple loops, and open*

## Keywords:

*create question profile curve polygon closed*