# on_rez

*LSL event*

```lsl
on_rez(integer start_param)
```

- `integer start_param`: Integer start parameter passed from the rezzing call.

**start_param** is always zero when an object is not rezzed by [llRezObject](/functions/llRezObject/) or [llRezAtRoot](/functions/llRezAtRoot/).

When an object is rezzed by [llRezObject](/functions/llRezObject/) or [llRezAtRoot](/functions/llRezAtRoot/), then **start_param** will be the value given as the last parameter of the rezzing command.

**start_param** is available at any subsequent time by calling [llGetStartParameter](/functions/llGetStartParameter/) (unless it has been overridden by [llRemoteLoadScriptPin](/functions/llRemoteLoadScriptPin/)). Passes start_param from the rezzing call (or 0 if rezzed from inventory).

Triggered when an object is rezzed (by script or by user). Also triggered in attachments when a user logs in, or when the object is [attach](/events/attach/)ed from inventory.

```lsl title="How to use" frame="terminal"
on_rez(integer start_param)
{

}
```

## Caveats

- If an object is rezzed by another object then the [object_rez](/events/object_rez/) event in the parent object does not trigger at the same time as the on_rez event in the child object and the order of the events is not guaranteed. See the examples in [object_rez](/events/object_rez/) for how to reliably establish communications between objects when rezzing.

## Examples

<details open>
<summary>Example 1</summary>

```lsl
default
{
    on_rez(integer start_param)
    {
        // Restarts the script every time the object is rezzed
        llResetScript();
    }
}
```

</details>

## Notes

### [state_entry](/events/state_entry/) & [on_rez](/events/on_rez/)

[state_entry](/events/state_entry/) will be triggered prior to [on_rez](/events/on_rez/) if [state_entry](/events/state_entry/) has not been run prior.

### [on_rez](/events/on_rez/) & [attach](/events/attach/)

[on_rez](/events/on_rez/) will be triggered prior to [attach](/events/attach/) when attaching from inventory or during login.

### [on_rez](/events/on_rez/) & slow events

If the script was already processing an event at rez time, [on_rez](/events/on_rez/) does not **not** trigger until the current event handler is completed. (same with [attach](/events/attach/))

## See also

### Functions

- [llGetStartParameter](/functions/llGetStartParameter/)
- [llRezObject](/functions/llRezObject/)
- [llRezAtRoot](/functions/llRezAtRoot/)

### Events

- [object_rez](/events/object_rez/) — triggered when this object rezzes an object from inventory
- [state_entry](/events/state_entry/) — triggered during script startup, reset and state change

---

*Source: [On rez](https://wiki.secondlife.com/wiki/On_rez) on the Second Life Wiki. Content from the Second Life Wiki article On rez (revision 1212503, 2022-10-01), CC BY-SA 3.0.*

---

From lsl.dev: https://lsl.dev/events/on_rez/