DB LabsWhat Is Photogrammetry on iPhone?
By Jack Smith — Updated March 12, 2026
Photogrammetry is the process of creating 3D models from overlapping 2D photographs. On iPhone, apps like Polycam, Scaniverse, and Apple's RealityKit use dozens or hundreds of photos taken from different angles to reconstruct objects and environments as detailed 3D meshes with textures. Photogrammetry is storage-intensive — a single scan can produce files ranging from 50 MB to over 500 MB.
How Photogrammetry Works on iPhone
The process starts by capturing overlapping photographs of an object or scene from many angles — typically 30 to 200+ images depending on the subject's complexity. Software then identifies matching features across photos, calculates camera positions, and triangulates 3D point positions. These points form a dense point cloud that gets converted into a mesh (a surface made of triangles), which is then textured using the original photos.
On iPhone, most of this processing happens either on-device using the Neural Engine and GPU, or is uploaded to cloud servers for more complex reconstructions. Apple's Object Capture API, part of RealityKit, enables native photogrammetry processing directly on Apple Silicon devices.
Storage Impact
Photogrammetry is one of the most storage-hungry activities you can do on an iPhone. The source photos alone can total 500 MB to 2 GB for a detailed scan. The resulting 3D model adds another 50-500 MB depending on mesh density and texture resolution. A typical scan session can consume 1-3 GB of storage in total.
- Source photos: 30-200+ images at 2-5 MB each = 60 MB to 1 GB+
- 3D model file: 50-500 MB (USDZ, OBJ, or GLB format)
- Texture maps: 10-200 MB of additional image data baked onto the mesh
If you scan frequently, consider offloading completed scans to cloud storage or an external drive. You can also delete source photos after the 3D model has been finalized to reclaim significant space.
LiDAR vs. Photo-Only Photogrammetry
iPhones with LiDAR (iPhone 12 Pro and later Pro models) can combine laser depth data with photogrammetry for faster, more accurate scans. LiDAR provides a depth scaffold that reduces the number of photos needed and improves alignment accuracy, especially for featureless surfaces like walls and floors. Photo-only photogrammetry works on any iPhone but requires more photos and more processing time.
Popular Photogrammetry Apps
- Polycam — Supports both LiDAR and photo-mode scanning with cloud processing
- Scaniverse — Free app from Niantic with on-device processing
- RealityCapture — Professional-grade photogrammetry (desktop processing)
- Apple Object Capture — Developer API for building custom scanning apps
Related Terms
- LiDAR Scanner — Depth sensor that enhances photogrammetry accuracy
- ProRAW — High-quality photo format often used for photogrammetry source images
- HEIC — Standard iPhone photo format used in basic scans
Frequently Asked Questions
How much storage does photogrammetry use on iPhone?
A single scan can use 50-500 MB for the 3D model alone. Including source photos, a complete scan session may consume 1-3 GB of storage.
Do I need a LiDAR iPhone for photogrammetry?
No. Photogrammetry works on any iPhone using overlapping 2D photos. LiDAR (available on iPhone 12 Pro+) improves speed and accuracy but is not required.
What apps do photogrammetry on iPhone?
Popular options include Polycam, Scaniverse, and apps built on Apple's Object Capture API. Each offers different tradeoffs between on-device and cloud processing.
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