Resource · Definition

What is a 3D walkthrough?

A plain-English guide to what a 3D walkthrough actually is, how it differs from renders and virtual tours, how one is made, and what it costs in India.

In short

A 3D walkthrough is an interactive, first-person tour of a building you can walk through in a web browser. The viewer controls the camera, walks room to room, and explores the space the way they would if they were standing inside it — instead of watching a pre-rendered video or flipping through still images.

What is a 3D walkthrough?

A 3D walkthrough is an interactive first-person tour of a three-dimensional space, rendered in real time on a screen. The viewer controls the camera — they walk through rooms, turn around, look up at the ceiling, look out the window, and spend as much time in any part of the space as they want. It is closer to a single-player video game than to a video.

The space itself is built from a 3D model — typically authored by an architect or designer in a tool like SketchUp, Revit or Rhino. Lighting, materials and furniture are added on top. The whole scene is then packaged so it can run inside a standard web browser, on a laptop, tablet or phone, with no plugin or app install required.

A 3D walkthrough is the format you reach for when a 2D plan or a rendered image is not enough — when the person on the other end of the conversation needs to understand what it actually feels like to stand inside the space.

How is it different from a render or a 360° tour?

The three formats most often confused with a 3D walkthrough are 3D renders, rendered flythrough videos, and 360° virtual tours. Each is useful in its own context, but they are not interchangeable.

3D walkthrough vs 3D render

A 3D render is a single still image of a 3D scene from a specific camera angle, computed offline by a render engine like V-Ray, Corona or Lumion. A walkthrough is a continuous, interactive experience of that same 3D scene — many thousands of frames, generated in real time as the viewer moves.

3D walkthrough vs rendered flythrough video

A rendered flythrough is a fixed video — usually 30 to 90 seconds — where the camera path, framing and pace are decided in advance and the output is an MP4 the viewer watches. A 3D walkthrough is interactive — the viewer steers the camera, decides which room to enter first, and lingers wherever they want.

3D walkthrough vs 360° virtual tour

A 360° tour is a stitched series of panoramic images. The viewer can pan around inside each panorama, but movement between locations is teleportation — they jump from one fixed bubble to the next. A 3D walkthrough renders the actual geometry, so movement is continuous and the viewer can walk anywhere the floor allows, not just to predefined positions.

3D walkthrough vs VR

VR puts the viewer inside the same first-person 3D scene using a headset like the Meta Quest or Apple Vision Pro, with stereo rendering and head tracking. A standard 3D walkthrough renders the same scene to a flat screen — laptop, tablet or phone — and the viewer steers with mouse, keyboard or touch. The geometry and lighting are the same; the input device differs.

How is a 3D walkthrough made?

A 3D walkthrough is built in three stages: model, dress, publish. Each stage is handled by a different tool, and the workflow is the same whether the source is a residential SketchUp model in Kerala or a stadium project authored in Revit.

1. Model the space

The architect or designer authors the geometry in a CAD tool — most commonly SketchUp for residential and small-commercial work, Revit for larger projects, Rhino for parametric design, or 3ds Max for archviz-first studios. The output is a file containing walls, floors, windows, doors and basic materials.

2. Dress the scene

A walkthrough application imports the model and adds the layers a CAD tool will not give you: realistic materials, point and area lights, sun direction, and furniture. This is where a bare model becomes a place — a kitchen with warm under-cabinet lighting, a living room with a real sofa, a bedroom that looks like 7pm.

3. Bake and publish

The walkthrough application then bakes the scene — pre-computing the lighting and shadows so the browser does not have to recalculate them on every frame — and packages the result as a self-contained web payload. The output is a URL. Send the URL, the viewer opens it, the walkthrough loads.

Who uses 3D walkthroughs, and what for?

The original audience for 3D walkthroughs was archviz studios producing showcase pieces for award entries. The current audience is much broader — anyone who needs to communicate the experience of a building before it exists.

  • Architects use walkthroughs to present residential and commercial designs to clients who cannot read 2D plans. The walkthrough replaces a stack of printouts and a stack of “what does this look like?” questions.
  • Real-estate developers use them to sell apartments off-plan, before the building is up. Buyers walk a representative unit on the developer’s website months before site work begins.
  • Interior designers use them to walk clients through proposed schemes — finishes, lighting, furniture layout — so the conversation happens before the contractor arrives.
  • Hospitality and retail brands use them for design review across distributed teams — a regional manager in another city walks the proposed store layout instead of waiting for renders.

How much does a 3D walkthrough cost in India?

There are two cost models, and they look nothing alike. A pre-rendered walkthrough video commissioned from an Indian archviz agency typically runs ₹1.5 lakh to ₹5 lakh per project, with a turnaround of two to four weeks. The deliverable is a single MP4 of a fixed camera path.

Subscription-based interactive walkthrough software — Brickrat, Shapespark, Enscape — runs ₹2,000 to ₹25,000 per month and covers every project on the architect’s desk. The deliverable is a shareable URL the client opens in their browser.

For most residential and small-commercial work, the second model is dramatically cheaper per project — a single agency video can fund a year of subscription software. The agency video still wins for cinematic marketing assets, where the camera path is part of the deliverable.

How long does it take to make one?

Assuming the underlying 3D model is already finished, a first-time interactive walkthrough of a residential project takes most architects a single afternoon — most of that time is spent placing furniture and tuning lights, not learning the tool. Subsequent walkthroughs on similar projects take two to three hours.

A pre-rendered agency video of the same project takes the agency two to four weeks of elapsed time, including a design brief, multiple revision rounds, and final render time on their farm.

What does the client need to view it?

Modern interactive walkthroughs run on WebGL — a graphics standard supported by every mainstream browser since 2012. The client needs nothing other than a recent version of Chrome, Safari, Firefox or Edge. No app store, no plugin, no account, no download.

On a desktop or laptop, the client clicks and drags to look around, and uses arrow keys or W/A/S/D to walk. On a tablet or phone, they swipe to look and tap to move. A residential walkthrough loads in five to ten seconds on a typical home internet connection and runs smoothly on hardware as old as a 2018 laptop or a mid-range smartphone.

Keep reading

More on 3D walkthroughs.

Inside Brickrat’s walkthrough features
The upload, lighting, furniture, bake and viewer that turn a SketchUp file into a browser walkthrough.
See the features →
SketchUp to browser walkthrough
Walk through the .skp → browser-link workflow, step by step, the way most Indian architects already work.
See the integration →
Walkthrough vs an agency video
The cost, turnaround, and revision math, line by line — when each format wins.
Read the comparison →
Convert your SketchUp model to a browser walkthrough
A practical guide to publishing your first interactive walkthrough from a finished SketchUp file.
Read the post →

FAQ

Frequently asked questions.

What is a 3D walkthrough?
A 3D walkthrough is an interactive first-person tour of a building or interior space, viewed in real time on a screen. The viewer controls the camera — they walk room to room, look around, and explore the space as if they were inside it, instead of watching a fixed video or flipping through still images.
How is a 3D walkthrough different from a rendered video?
A rendered video is a fixed flythrough — the camera path, framing and pace are decided in advance and the output is an MP4 file the viewer watches. A 3D walkthrough is interactive — the viewer steers the camera themselves, looks where they want, and spends as much time in any room as they like.
How is a 3D walkthrough different from a 360° virtual tour?
A 360° virtual tour is a series of stitched panoramas you can pan inside but cannot walk between freely — you teleport from one fixed point to the next. A 3D walkthrough lets you walk continuously through the space, with the geometry rendered in real time, so the experience is closer to a video game than to a panorama gallery.
What is the difference between a 3D walkthrough and a 3D model?
A 3D model is the underlying geometry — typically authored in SketchUp, Revit, Rhino or 3ds Max — and viewed inside the modelling tool. A 3D walkthrough is an end-user-ready experience built on top of that model, with materials, lighting, furniture and a first-person camera, designed for someone who has never opened a CAD application.
What does an architect use a 3D walkthrough for?
Architects use 3D walkthroughs to present designs to clients who cannot read 2D plans, to win pitches against firms that only show printouts, and to cut revision cycles by removing ambiguity early. Most residential clients make sharper decisions after walking the space themselves than after reviewing a stack of drawings.
How is a 3D walkthrough made?
A 3D walkthrough is made in three stages: an architect models the building in a tool like SketchUp, a walkthrough application adds materials, lighting and furniture and bakes the scene for the web, and the result is published as a shareable browser link. Tools like Brickrat compress the second and third stages into an afternoon for a residential project.
What is “baking” in a 3D walkthrough?
Baking is pre-computing the lighting and shadow information of a 3D scene and storing it on the surfaces of the model, so the browser does not have to recalculate it on every frame. Baked walkthroughs run smoothly on mid-range laptops and phones because the heavy lighting math has already been done.
What software makes 3D walkthroughs?
Common 3D walkthrough software includes Brickrat, Shapespark, Enscape, Twinmotion, Lumion and Unreal Engine. They differ in input format, output target (browser link vs standalone executable vs VR), price band, and whether they are aimed at archviz studios, real-estate developers, or working architects.
Does a 3D walkthrough need a special viewer or plugin?
A modern 3D walkthrough opens in any standard web browser using WebGL — no plugin, no app store, no account needed. The viewer just clicks the link and the walkthrough loads in seconds, on a laptop, tablet or phone.
How long does it take to make a 3D walkthrough?
For a residential project where the SketchUp model is already finished, a first-time 3D walkthrough takes most architects a single afternoon — most of that time is spent placing furniture and tuning lights. Subsequent walkthroughs on similar projects take a couple of hours.
How much does a 3D walkthrough cost in India?
Pre-rendered walkthrough videos from Indian architectural visualization agencies typically run ₹1.5 lakh to ₹5 lakh per project, with a 2 to 4 week turnaround. Subscription-based interactive walkthrough software runs ₹2,000 to ₹25,000 per month and covers every project on the architect’s desk.
Can a client view a 3D walkthrough on a phone?
Yes. Modern browser-based 3D walkthroughs are tuned for mid-range mobile hardware and run inside the phone’s built-in browser. The client taps the link, drags a finger to look around, and taps arrows or swipes to walk forward.
Is a 3D walkthrough the same as VR?
No, but the two are related. VR puts the viewer inside the same first-person 3D scene using a headset like the Quest or Vision Pro, with stereo rendering and head tracking. A standard 3D walkthrough renders the same scene to a flat screen — laptop, tablet or phone — and the viewer steers with mouse, keyboard or touch.
Who needs a 3D walkthrough?
Architects use them to present residential and commercial designs to clients. Real estate developers use them to sell apartments before the building is up. Interior designers use them to walk clients through proposed schemes. Anyone trying to communicate the experience of a not-yet-built space benefits from one.

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