---
name: "gluNurbsCallbackDataEXT"
section: "3x"
platform: "linux"
package: "xlibmesa-glu-dev"
version: "4.3.0.dfsg.1-14sarge7"
release: "Debian 3.1 (Sarge)"
platforms: ["linux"]
url: "https://new.carta.tech/gluNurbsCallbackDataEXT"
---

# gluNurbsCallbackDataEXT(3x)

set a user data pointer

## NAME

**gluNurbsCallbackDataEXT** - set a user data pointer

## C SPECIFICATION

void **gluNurbsCallbackDataEXT**( GLUnurbs\* *nurb*,

```
	GLvoid* userData )
```

delim $$

## PARAMETERS

- *nurb*

  Specifies the NURBS object (created with **gluNewNurbsRenderer**).

- *userData*

  Specifies a pointer to the user's data.

## DESCRIPTION

**gluNurbsCallbackDataEXT** is used to pass a pointer to the application's data to NURBS tessellator. A copy of this pointer will be passed by the tessellator in the NURBS callback functions (set by **gluNurbsCallback**).

## SEE ALSO

**gluNurbsCallback(3G)**