---
title: Preliminary_Action
framework: usd
role: collectionGroup
path: usd/preliminary-action
---

# Preliminary_Action

A specific task that a trigger performs.

## Overview

Overview Because it inherits Typed, this schema declares a Preliminary_Action as a type of prim. For more information about typed schemas, see USD Specification > Typed. When a behavior executes an action, the behavior modifies the state of the scene dynamically. For example, an action might start an animation, change the location of a prim, or start playing audio. Declaration class "Preliminary_Action" (     inherits = </Typed> ) Define an action that slides a cube The following example shows an action prim called PushCube that affects an impulse feature. #usda 1.0

def Cube "Cube" {}

def Preliminary_Action "PushCube" {         uniform token info:id = "Impulse"     rel affectedObjects = [ </Cube> ]     uniform vector3d velocity = (1.0, 0.0, 0.0) }

## Topics

### Properties

- [info:id](usd/info-id.md)
- [multiplePerformOperation](usd/multipleperformoperation.md)

## See Also

### Actions

- [AudioAction](usd/audioaction.md)
- [ChangeSceneAction](usd/changesceneaction.md)
- [EmphasizeAction](usd/emphasizeaction.md)
- [GroupAction](usd/groupaction.md)
- [ImpulseAction](usd/impulseaction.md)
- [LookAtCameraAction](usd/lookatcameraaction.md)
- [OrbitAction](usd/orbitaction.md)
- [SpinAction](usd/spinaction.md)
- [StartAnimationAction](usd/startanimationaction.md)
- [TransformAction](usd/transformaction.md)
- [TransformAnimationAction](usd/transformanimationaction.md)
- [VisibilityAction](usd/visibilityaction.md)
- [WaitAction](usd/waitaction.md)
- [NotificationAction](usd/notificationaction.md)