3D Spatial Viewer

3D Spatial Viewer is an application designed for Apple Vision Pro, iPhone, and iPad that displays 3D models at true 1:1 scale for engineering and design review. It imports common file formats such as STL, OBJ, PLY, and USDZ from local files or iCloud, allowing users to load multiple parts at a consistent scale. Users can rotate and reposition models with gestures, adjust transparency, apply colors, and play animations embedded in USDZ files.

The app is specifically aimed at engineers, designers, manufacturing teams, hobbyists, and enthusiasts who need to inspect parts and assemblies at true 1:1 scale. It allows users to walk around models and analyze them with a professional workflow without needing a mouse or orbit camera, relying instead on hand and eye tracking.

To get started, users can download the universal app for free from the App Store, which supports visionOS 2.0, iOS 17, and iPadOS 17 or later. The application works offline and allows users to load and explore their 3D models anywhere, including on iPhone and iPad for review on the go.

The software supports a variety of file formats including STL, OBJ, PLY, GLB, and USDZ, which can be imported from Files or iCloud. Users can also load multiple parts at once at a consistent scale to inspect assemblies effectively.

Users can inspect models naturally by rotating and repositioning them with intuitive gestures, and they can set per-model transparency to see through assemblies. Additionally, assigning colors to untextured meshes helps clarify details during the review process.

The app includes tools for measuring distances directly on geometry at real-world scale, allowing users to place points to check clearances and fit. Users can also slice any model along the X, Y, or Z axis to reveal internal geometry and wall thickness.

Users can capture spatial screenshots and review them in a built-in gallery, where they can annotate with pen, marker, and highlighter to flag issues. They can also save and recall specific camera positions and model states to jump back to critical angles instantly.

The application enables collaborative design reviews via SharePlay, allowing users to start a shared FaceTime session to inspect the same models together. When a SharePlay session starts, all models already open are automatically sent to the other participant, including OBJ files.

Some users on Reddit say the app is a free tool that turns CAD and mesh files into full-scale objects you can walk around and measure. It is described as being aimed at people who actually need to inspect 3D models, including engineers, designers, and hobbyists who scan or print things.

The website states that the app is now a universal app, meaning the same workflow runs on iPhone and iPad in addition to Apple Vision Pro. This allows users to load and explore their 3D models anywhere, with reliable receiving on iPhone even if nothing has been loaded yet.

The app provides a transfer indicator that clearly shows 'Sharing model…' or 'Receiving model…' while a model is being sent or received. On iPhone, the info button hides while a model is loaded to provide a cleaner view during the sharing process.

The software requires visionOS 2.0 or later to run on Apple Vision Pro, and it is available for download on the App Store. It functions as a standalone application that does not require an internet connection for basic operations.

On Trustburn, 3D Spatial Viewer has a rating of 4.6 out of 5 based on 5 reviews.