# Nurbs

Nurbs are features that generate 3D geometry from [splines](https://help3.depence.com/depence-construction/depence-splines).

![Example of Nurbs](https://4198123652-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MhIYO0xEuDDA2b69m5L%2Fuploads%2FxyNIFHx49CrmfafhLMio%2Fimage.png?alt=media\&token=ef4fd8a6-c077-448c-ba90-115376326f3a)

## Usage

To add a nurbs feature from the 3D Hierarchy, click on "Add" and select your feature:

![Nurbs features](https://4198123652-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MhIYO0xEuDDA2b69m5L%2Fuploads%2FFqGj8JtDfXa5yrmhPqzi%2FNurbs-Menu.png?alt=media\&token=e28b8ebf-f159-4a40-a1d2-d4dcd3cf49a3)

All nurbs features require a spline to generate 3D geometry. The [spline](https://help3.depence.com/depence-construction/depence-splines) must be a child of the nurbs:

![Sweep Nurbs](https://4198123652-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MhIYO0xEuDDA2b69m5L%2Fuploads%2FOibnw0uahBPEQWXg63Kf%2Fimage.png?alt=media\&token=3fca4b77-822c-4ac1-9dcc-9fd1348ef645)

### Sweep nurbs

Sweep nurbs will create tubes around the [spline](https://help3.depence.com/depence-construction/depence-splines):

![Sweep Nurbs - Settings](https://4198123652-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MhIYO0xEuDDA2b69m5L%2Fuploads%2F6G8hbvJ3ZZZCLUTd5Htu%2Fimage.png?alt=media\&token=8a298a29-7c69-4755-9bec-f3faa4bdfc5e)

Its radius can be adjusted through the dimension properties.

### Extrude nurbs

Extrude nurbs will extrude the [spline ](https://help3.depence.com/depence-construction/depence-splines)vertically to generate a volume:

![Extrude nurbs - Settings](https://4198123652-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MhIYO0xEuDDA2b69m5L%2Fuploads%2FCoqW35pQRVs9U7KU5RC2%2Fimage.png?alt=media\&token=eaeff1c6-96e2-40f0-a721-d0a10731b4bc)

Its depth can be adjusted through the dimension properties.