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Instant Placement developer guide for AR Foundation | ARCore

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Learn how to use the Instant Placement API, or persistent raycasts, in your own apps.

Make sure that you understand fundamental AR concepts and how to configure an ARCore session before proceeding.

Names of certain concepts and methods may differ between AR Foundation and the ARCore SDK for Unity. These are listed in the table below for easy reference.

This guide assumes you have already installed and configured Unity. If not, see the Getting started with ARCore Extensions for AR Foundation for installation and setup steps.

Instant Placement (persistent raycasts) is available out of the box with the AR Foundation package. Follow these steps to set up your scene.

1. Add the predefined game objects AR Session Origin and AR Session.

2. Add the AR Raycast Manager component into the AR Session Origin game object.

When Raycast Prefab is not null, ARRaycastManager will instantiate the prefab and automatically sync its pose with the pose of ARRaycast.

1. Add the predefined game objects XR Origin and AR Session.

2. Add the AR Raycast Manager component into the XR Origin game object.

When Raycast Prefab is not null, ARRaycastManager will instantiate the prefab and automatically sync its pose with the pose of ARRaycast.

1. Add the predefined game objects XR Origin and AR Session.

2. Add the AR Raycast Manager component into the XR Origin game object.

When Raycast Prefab is not null, ARRaycastManager will instantiate the prefab and automatically sync its pose with the pose of ARRaycast.

In a new ARCore session, perform a hit test using ARRaycastManager.AddRaycast(Vector2, float).

public ARRaycastManager RaycastManager; // set from the Editor Inspector.

void Update()
{
    Touch touch;
    if (Input.touchCount < 1 || (touch = Input.GetTouch(0)).phase != TouchPhase.Began)
    {
        return;
    }

    if (EventSystem.current.IsPointerOverGameObject(touch.fingerId))
    {
        return;
    }

    ARRaycast raycast = RaycastManager.AddRaycast(touch.position, _estimateDistance);
    if (raycast != null)
    {
        // You can instantiate a 3D object here if you haven’t set Raycast Prefab in the scene.
        …
    }
}

If ARCore has an accurate 3D pose, the ARRaycast.trackingState will be Tracking. Otherwise, it will start with Limited and transition to Tracking once ARCore has an accurate 3D pose. Once the tracking state becomes Tracking, it will not revert to Limited.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-07-14 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-07-14 UTC."],[[["Learn to use the Instant Placement API or persistent raycasts in your AR apps."],["Understand fundamental AR concepts and ARCore session configuration as prerequisites."],["Set up your scene with AR Session Origin, AR Session, and AR Raycast Manager components."],["Place objects by performing hit tests using `ARRaycastManager.AddRaycast`."],["Monitor the `ARRaycast` tracking state to determine the accuracy of the 3D pose."]]],[]]

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