LiDAR vs Photogrammetry: Which 3D Scanning Method Should You Use?

If you've started capturing the real world in 3D on your iPhone, you've run into two terms that get used almost interchangeably but mean very different things: LiDAR and photogrammetry. Both turn physical reality into a 3D model. Both run on a modern iPhone. But they work in fundamentally opposite ways, and each is dramatically better than the other at certain jobs.

Pick the wrong one and you'll fight the tool — trying to LiDAR-scan a small detailed object and getting a blobby mess, or trying to photogrammetry a whole room and spending an hour for a worse result than a two-minute scan would have given you. Pick the right one and the same phone produces clean, accurate, usable 3D either way.

This guide explains how each method actually works, where each wins and loses across accuracy, speed, lighting, and object type, and — most usefully — exactly when to reach for room LiDAR scanning (Apple's RoomPlan) versus photo-based capture (Apple's Object Capture). Both live in Lidar Scanner, so the real question isn't which app to buy; it's which mode to tap for the thing in front of you.

How LiDAR Works

LiDAR — Light Detection and Ranging — is an active sensing technology. The LiDAR scanner on a Pro iPhone or iPad Pro fires out pulses of infrared light and measures how long each pulse takes to bounce back. Because the speed of light is constant, that timing translates directly into distance, producing a dense field of precise depth measurements — a point cloud — of everything in front of the sensor.

The key word is active: LiDAR makes its own light and measures it, so it doesn't depend on ambient illumination to determine distance, and it captures geometry in real time as you move. On iPhone, Apple's RoomPlan framework builds on this, fusing the LiDAR depth stream with the camera feed and motion sensors to recognize architectural elements — walls, doors, windows, openings — and furniture, assembling a structured 3D model of a room while you walk through it.

What this gives you: fast, dimensionally accurate capture of large surfaces and spaces, with measurements you can trust to within a few centimeters, available the instant you finish.

How Photogrammetry Works

Photogrammetry is the opposite approach — it's passive and computational. Instead of measuring distance directly, it takes many overlapping photographs of a subject from different angles and reconstructs 3D geometry by analyzing how features shift between images. Software finds the same point across multiple photos, triangulates where it must sit in space, and builds up a detailed, textured mesh from thousands of those correspondences.

On iPhone, Apple's Object Capture is the photogrammetry pipeline. You shoot a guided set of photos all the way around an object — a turntable-style sweep — and it produces a photogrammetry-ready, fully textured 3D model with the real surface colors and fine detail baked in.

Because it's reconstructing from photographs, photogrammetry's superpower is surface fidelity: it captures intricate detail and true-to-life texture far better than LiDAR's depth-only point cloud. Its weakness is that it depends entirely on the photos — it needs good light, lots of overlap, and surfaces with enough visual texture for the software to find matching features.

There's a deeper philosophical difference worth holding onto. LiDAR measures the world — it knows distances because it timed them. Photogrammetry infers the world — it deduces shape from how the picture changes as the camera moves. That's why LiDAR is dependable about dimensions but coarse about detail, and photogrammetry is rich in detail but only as trustworthy as the photo set you fed it. Keep that distinction in mind and most of the tradeoffs below follow naturally.

The Tradeoffs: Accuracy, Speed, Lighting, Object Type

Neither method is "better." They're optimized for different things. Here's how they compare on the axes that actually matter.

Accuracy and scale

LiDAR delivers reliable dimensional accuracy across large surfaces — centimeter-level wall lengths and room dimensions — which is exactly what you want for floor plans and as-builts. Its detail resolution is coarser, though; it's measuring depth, not capturing fine surface relief.

Photogrammetry delivers high surface detail and can resolve fine geometry on a well-photographed object, but its real-world scale depends on the capture and processing, and it's far better suited to single objects than to entire rooms.

Speed

LiDAR is fast — both to capture and to process. A room scan is a single slow walk-around, and the model and floor plan are ready in seconds, on-device. Photogrammetry is slower on both ends: you shoot dozens of carefully overlapped photos, then the reconstruction has to crunch them into a mesh.

Lighting

This is a real differentiator. LiDAR's depth measurement works in any light, even darkness — though RoomPlan still wants decent light for its camera-based recognition and tracking. Photogrammetry lives and dies by lighting: it needs bright, even, diffuse light with no harsh shadows or blown-out highlights, because shadows get baked into the texture and poor exposure starves the matching algorithm.

Object type and surfaces

LiDAR excels at large, planar, structural things — rooms, walls, building interiors. It struggles with small intricate objects (too little detail) and with glass and mirrors (light passes through or reflects, creating artifacts).

Photogrammetry excels at small-to-medium objects with visible texture — figurines, products, sculptural pieces, anything with surface detail worth preserving. It struggles with featureless surfaces (a blank white wall gives the matcher nothing to lock onto), and shares LiDAR's difficulty with transparent and shiny materials.

Equipment and accessibility

A point in LiDAR's favor that's easy to overlook: dedicated LiDAR scanners have historically cost thousands of dollars, while photogrammetry only ever needed a camera. The interesting thing about a modern Pro iPhone is that it collapses that distinction — the same device carries a real LiDAR sensor and a camera capable of photogrammetry. So the old "LiDAR is the expensive professional option, photogrammetry is the accessible one" framing no longer applies. On iPhone, both are free with the hardware you already own, and choosing between them is purely about which fits the subject — not which you can afford.

Output and post-processing

The two methods also tend to produce different kinds of output. LiDAR room scanning, through RoomPlan, yields structured results: clean architectural geometry with labeled walls, openings, and objects, plus a derived 2D floor plan — data that's ready to use immediately and exports neatly to USDZ or RoomPlan JSON. Photogrammetry yields a textured mesh: a detailed, photo-realistic surface that captures how an object actually looks, but as raw geometry rather than labeled structure. If your goal is a measured plan, LiDAR's output needs little cleanup; if your goal is a lifelike object, photogrammetry's texture is the payoff. Both, in Lidar Scanner, are generated and finished on-device.

At a glance

When to Use Room LiDAR (RoomPlan)

Reach for LiDAR room scanning when you're capturing space and structure:

• Rooms and interiors — bedrooms, kitchens, offices, retail floors. Anything where you need walls, doors, windows, and layout.
• Floor plans and measurements — when the deliverable is a dimensioned 2D plan or a measured as-built. LiDAR's accuracy across large surfaces is exactly the strength here.
• Real estate, interior design, architecture, facilities — workflows that care about layout, square footage, and how a space is arranged. Our guide to iPhone LiDAR for real estate floor plans digs into this use case.
• Speed-critical capture — when you need a usable result in minutes, on-site, without post-processing.

If your subject is a place you can walk through, LiDAR is the answer. The full workflow — prep, capture, editing, and export — is in our complete guide to scanning a room with iPhone LiDAR, and the scanning tips guide will help you get the cleanest results.

When to Use Object Capture (Photogrammetry)

Reach for Object Capture when you're capturing a single object with detail worth preserving:

• Products and props — items you want as detailed, textured 3D models for listings, AR, or catalogs.
• Figurines, sculptures, and collectibles — subjects where surface relief and true color are the whole point.
• Creative and AR assets — base meshes of real objects to bring into your 3D tools or AR scenes.
• Anything you can circle — if you can comfortably walk all the way around the subject and photograph it from every angle in good light, photogrammetry will capture detail LiDAR can't.

If your subject is a thing you can put on a table and orbit, Object Capture is the answer. Just give it bright, even light and plenty of overlapping angles — featureless, transparent, or mirror-finished objects are the ones to approach with caution.

Lidar Scanner Gives You Both

Here's the part that makes the choice low-stakes: you don't have to commit to one method or own two apps. Lidar Scanner includes both pipelines, so you pick the right tool per subject:

• Live LiDAR room scanning powered by RoomPlan — walls, doors, windows, openings, and furniture captured with live on-screen guidance, in Standard or High-Fidelity quality, producing an editable floor plan and a 3D room model.
• Object Capture — guided turntable photo sets turned into photogrammetry-ready, textured 3D models of individual objects.

Both feed into the same toolkit: a three-mode floor plan editor for room scans, a scan library to browse and organize everything you capture, location metadata for correctly oriented plans, and a full set of exports — USDZ and textured mesh for 3D, RoomPlan JSON for raw structured data, and DXF, PDF, and SVG for floor plans. If you're deciding which 3D format to keep, our USDZ vs OBJ vs RoomPlan JSON breakdown covers it, and everything is processed on-device — private, offline, no account required.

So the practical workflow is simple: scanning a space? Use room LiDAR. Capturing an object? Use Object Capture. One app, the right method for whatever's in front of you.

Can You Combine Both Methods?

A natural question once you have both tools in one place: should you ever use them together? In professional 3D capture, the answer is sometimes yes — LiDAR provides the accurate dimensional skeleton of a space while photogrammetry layers in rich surface detail, and the two get fused into a single result. RoomPlan itself already blends ideas from both worlds, using the LiDAR depth stream for geometry and the camera feed to recognize and classify what it's seeing.

For most everyday captures, though, you won't need to merge them by hand — you'll just pick the right one for the subject. The useful mental model is scale: as your subject gets larger and more architectural, LiDAR pulls ahead; as it gets smaller and more detailed, photogrammetry does. A whole room is unambiguously LiDAR territory. A single ornament is unambiguously Object Capture territory. The genuinely in-between cases — a large piece of furniture, say — are rare, and even then you can simply try one, check the result, and switch if it disappoints. Because both modes live in the same app and process on-device, experimenting costs you nothing but a minute.

Choosing the Right Tool

LiDAR and photogrammetry aren't competitors so much as specialists. LiDAR is your fast, accurate choice for rooms, walls, and floor plans — large structural captures where dimensions matter and you need a result in minutes. Photogrammetry is your high-detail choice for individual objects — products, figurines, and props where surface texture and fine relief are the point and you can take your time in good light. Match the method to the subject and the same iPhone handles both beautifully.

Lidar Scanner puts both in one app — RoomPlan room scanning and Object Capture photogrammetry, with a floor plan editor and exports to USDZ, DXF, PDF, SVG, and JSON, all on-device. It's available on the App Store. Download it from the App Store to start scanning, explore every capability on the features page, see how the whole pipeline works, and compare what's free and what Pro unlocks on the pricing page.

Whichever method your next project calls for, your phone is already carrying the tool.