---
title: Preliminary_Behavior
framework: usd
role: collectionGroup
path: usd/preliminary-behavior
---

# Preliminary_Behavior

A typed schema that combines one or more triggers with associated actions.

## Overview

Overview Because it inherits Typed, this schema declares a Preliminary_Behavior as a type of prim. For more information about typed schemas, see USD Specification > Typed. To run actions based on a trigger, an asset defines a prim of this type and sets its triggers and actions. Declaration class Preliminary_Behavior "Preliminary_Behavior" (     inherits = </Typed> ) Trigger animation for a tapped cube The following example demonstrates a behavior that applies an EmphasizeAction to a cube to flip it. Because the cube defines a tap trigger, the runtime performs the flip when a user taps the cube in an AR experience. #usda 1.0

def Preliminary_Behavior "TapAndFlip" {     rel triggers = [ <Tap> ]     rel actions = [ <Entry> ]

def Preliminary_Trigger "Tap" ( inherits = </TapGestureTrigger> )     {         rel affectedObjects = [ </Cube> ]     }

def Preliminary_Action "Entry" ( inherits = </GroupAction> )     {         uniform token type = "parallel"         rel actions = [ <Flip> ]     }

def Preliminary_Action "Flip" ( inherits = </EmphasizeAction> )     {         rel affectedObjects = [ </Cube> ]         uniform token motionType = "flip"     } }

def Cube "Cube" { }

## Topics

### Properties

- [triggers](usd/triggers.md)
- [actions](usd/actions.md)
- [exclusive](usd/exclusive.md)