Needle Engine Documentation
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Downloads
  • What is Needle Engine?
  • Testimonials
  • Get an overview

    • Samples and Showcase
    • Our Vision 🔮
    • Feature Overview
    • Technical Overview
  • Resources

    • Pricing and Plans
    • Changelog
    • API Documentation
    • Support & Community
  • Integrations

    • Needle Engine for Unity
    • Needle Engine for Blender
    • Needle Engine as Web Component
    • Needle Engine on your Website
    • Needle Cloud
  • Topics

    • Web Project Structure
    • Everywhere Actions
    • Exporting Assets to glTF
    • Frameworks, Bundlers, HTML
    • Testing on local devices
    • Deployment and Optimization
  • Advanced

    • Networking
    • VR & AR (WebXR)
    • Using Needle Engine directly from HTML
    • Editor Sync
  • Troubleshooting

    • How To Debug
    • Questions and Answers (FAQ) 💡
    • Get Help
  • Videos

    • Tutorials on Youtube
    • Interviews on Youtube
  • Scripting Overview

    • Scripting in Needle Engine
    • Scripting Introduction for Unity Developers
    • Needle Core Components
    • Everywhere Actions
  • Components and Lifecycle

    • Creating and using Components
    • @serializable and other decorators
    • Automatic Component Generation
    • Scripting Examples
    • Community Contributions
    • Additional Modules
  • Settings and APIs

    • <needle-engine> Configuration
    • needle.config.json
    • Needle Engine API
    • three.js API
Help
Samples
Pricing
  • Needle Website
  • Needle Cloud
  • Support Community
  • Discord Server
  • X/Twitter
  • YouTube
  • Newsletter
  • Email
  • Feedback
  • Github
  • English
  • 简体中文
  • Español
  • Português
  • Français
  • हिन्दी
  • 日本語
  • Deutsch
  • Tiếng Việt
  • Getting Started

    • Downloads
    • Needle Engine for Unity
    • Needle Engine for Blender
    • Needle Engine as Web Component
    • Needle Engine on your Website
    • Needle Cloud
    • Custom integrations
    • Support and Community
  • Core Concepts

    • Web Project Structure
    • Everywhere Actions
    • Exporting Assets to glTF
    • Frameworks, Bundlers, HTML
    • Testing on local devices
    • Deployment and Optimization
    • How To Debug
    • Questions and Answers (FAQ) 💡
  • Scripting

    • Scripting in Needle Engine
    • Scripting Introduction for Unity Developers
    • Creating and using Components
    • Automatic Component Generation
    • Scripting Examples
    • Community Contributions
  • Advanced

    • VR & AR (WebXR)
    • Networking
    • Editor Sync
  • Reference

    • Feature Overview
    • Technical Overview
    • Needle Core Components
    • needle.config.json
    • <needle-engine> Configuration
    • @serializable and other decorators

Overview

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View on Github

USDZ: Hide Object on Start

This is an example from our Everywhere Actions. The following script hides an object on start on Android and on iOS AR

export class HideOnStart extends Behaviour implements UsdzBehaviour {

    start() {
        this.gameObject.visible = false;
    }

    createBehaviours(ext, model, _context) {
        if (model.uuid === this.gameObject.uuid)
            ext.addBehavior(new BehaviorModel("HideOnStart_" + this.gameObject.name,
                TriggerBuilder.sceneStartTrigger(),
                ActionBuilder.fadeAction(model, 0, false)
            ));
    }

    beforeCreateDocument() {
        this.gameObject.visible = true;
    }

    afterCreateDocument() {
        this.gameObject.visible = false;
    }
}