ARCore 會連線至 ARCore API 雲端端點，以便代管及解析 Cloud Anchor，進而提供這些共用體驗。必須連上可正常運作的網際網路。
以下概略說明代管和解析的運作方式：
使用者在自己的環境中建立本機錨點。
錨點會代管：ARCore 會將該本機錨點的資料上傳至 ARCore API 雲端端點，而端點會傳回該錨點的專屬 ID。
應用程式會將該專屬 ID 分發給其他使用者。
錨點已解析：裝置具有專屬 ID 的使用者可以使用 ARCore Cloud Anchor API 重新建立相同的錨點。
託管
為建立及代管錨點，ARCore 會使用錨點周圍空間的 3D 特徵地圖。為了取得這張特徵地圖，裝置的後置鏡頭必須在主機呼叫前，從不同視角和位置繪製感興趣中心內和周圍的環境。接著，ARCore Cloud Anchor API 會建立空間的 3D 特徵地圖，並將專屬的 Cloud Anchor ID 傳回裝置。
解決中
當同一個環境中的其他使用者將裝置相機對準 Cloud Anchor 所在位置時，解析要求會讓 ARCore Cloud Anchor API 定期將場景中的視覺特徵與已建立的 3D 特徵地圖進行比較。ARCore 會利用這些比較結果，找出使用者相對於 Cloud Anchor 的位置、方向和姿勢。
[null,null,["上次更新時間：2025-07-26 (世界標準時間)。"],[[["\u003cp\u003eARCore enables AR experiences within Android Instant Apps, allowing users to engage without prior installation.\u003c/p\u003e\n"],["\u003cp\u003eUnlike regular apps, AR-enabled Instant Apps require explicit checks and installation prompts for Google Play Services for AR.\u003c/p\u003e\n"],["\u003cp\u003eDevelopers need to be mindful of the size constraints imposed on Instant Apps, with the ARCore SDK contributing to the limit.\u003c/p\u003e\n"],["\u003cp\u003eCreating an instant-enabled app bundle is the starting point for integrating ARCore with Instant Apps.\u003c/p\u003e\n"]]],[],null,["# Cloud Anchors allow different users to share AR experiences\n\n**Platform-specific guides** \n\n### Android (Kotlin/Java)\n\n- [Quickstart](/ar/develop/java/cloud-anchors/quickstart)\n- [Developer guide](/ar/develop/java/cloud-anchors/developer-guide)\n\n### Android NDK (C)\n\n- [Developer guide](/ar/develop/c/cloud-anchors/developer-guide)\n\n### Unity (AR Foundation)\n\n- [Developer guide](/ar/develop/unity-arf/cloud-anchors/developer-guide)\n\n### iOS\n\n- [Quickstart](/ar/develop/ios/cloud-anchors/quickstart)\n- [Developer guide](/ar/develop/ios/cloud-anchors/developer-guide)\n\n### Unreal Engine\n\n- [ARCore SDK for Unreal Engine (official documentation)](https://docs.unrealengine.com/5.0/en-US/developing-for-arcore-in-unreal-engine/)\n\nA **Cloud Anchor** is a special type of [anchor](/ar/develop/anchors) that can be used to persist AR experiences in the real world. With the **ARCore Cloud Anchor API** , or **ARCore Cloud Anchor service**, you can create interactive layers of digital information and anchor them to actual locations, designing experiences that can be shared over time by multiple people across many different devices. Cloud Anchors connect real world locations with digital content that anyone can access from compatible mobile devices. Both Android and iOS users can participate in the same experience and return to them again and again, even weeks or months later.\n\nAnchors and Cloud Anchors\n-------------------------\n\nCloud Anchors are anchors that are hosted on the [ARCore API](https://console.cloud.google.com/apis/library/arcore) cloud endpoint. This hosting enables users to share experiences in the same app. The basic guidelines for anchors also apply to Cloud Anchors.\n\nUse cases for developing with the ARCore Cloud Anchor API\n---------------------------------------------------------\n\nThe ARCore Cloud Anchor API can help persist AR experiences in the real world and create shared experiences between users. The following are some ways you can use it in your own projects.\n\n### Persist AR experiences in the real world\n\nCloud Anchors enable one user to place an AR object in the physical environment and another to see the same object at the same place at a later time. For example, use Cloud Anchors to create virtual signs in front of stores, leave virtual notes on their kitchen countertops for their friends, or redecorate their bedrooms with virtual posters. In general, Cloud Anchors are best used for room-scale AR experiences.\n\n### Real-time collaborative experiences\n\nCloud Anchors also enable real-time collaboration between users. For example, users can play a virtual game of ping-pong on the coffee table, or paint a virtual mural together with their community.\n\nDevice compatibility\n--------------------\n\nThe ARCore Cloud Anchor API works on all ARCore [supported devices](/ar/devices).\n\nHow Cloud Anchors work\n----------------------\n\nARCore connects to the [ARCore API](https://console.cloud.google.com/apis/library/arcore) cloud endpoint to host and resolve Cloud Anchors, thereby enabling these shared experiences. This requires a working Internet connection.\n\nHere's a high-level picture of how hosting and resolving works:\n\n1. The user creates a local anchor in their environment.\n2. The anchor is **hosted** --- ARCore uploads that local anchor's data to the ARCore API cloud endpoint, and the endpoint returns a unique ID for that anchor.\n3. The app distributes that unique ID to other users.\n4. The anchor is **resolved** --- Users whose devices have the unique ID can recreate the same anchor using the ARCore Cloud Anchor API.\n\n### Hosting\n\nYour browser does not support the video tag.\n\nTo establish and host an anchor, ARCore uses a 3D feature map of the space surrounding that anchor. To obtain this feature map, the device's rear camera must map the environment in and around the center of interest from different viewing angles and positions before the host call. The ARCore Cloud Anchor API then creates a 3D feature map of the space, and returns a unique Cloud Anchor ID to the device.\n\n### Resolving\n\nYour browser does not support the video tag.\n\nWhen another user in the same environment points their device's camera at the area where the Cloud Anchor was hosted, a resolve request causes the ARCore Cloud Anchor API to periodically compare visual features from the scene against the 3D feature map that was created. ARCore uses these comparisons to pinpoint the user's position, orientation, and pose relative to the Cloud Anchor.\n\n### API deprecation policy\n\nSee [ARCore Cloud Anchor API deprecation policy](/ar/develop/cloud-anchors/cloud-anchor-deprecation-policy)\nfor details."]]
