Can I walk through an IFC model in a web browser?

Yes. In IFC Viewer Online press G to switch to walk mode: move with WASD or the arrow keys, look with the mouse, and double-click a floor to glide there at eye height. It runs on the IFC directly, with nothing uploaded.

Why can I walk through walls?

On purpose. When reviewing a model you usually want to step through a wall into the next room rather than find the door. Collision also needs constant geometry queries that would slow large models down.

Is a browser walkthrough good enough for a client presentation?

For a live review, yes. For a polished presentation, record the walk as a video and edit it, or use guided tours that move the camera between saved views.

Back to the BIM & IFC blog

Tools & comparisons · 2026-10-02 · 7 min

Walk Through an IFC Model in First Person, in the Browser

Orbiting shows you a building as an object. Walking through it at eye height shows you the building as somebody will use it — and it is often the fastest way to find the door that opens into a column. How first-person navigation works on an IFC, and when it helps.

Walk Through an IFC Model in First Person, in the Browser — IFC Viewer Online article cover

Orbiting is how BIM tools teach us to look at buildings: from outside, slightly above, turning the model in our hands. It is excellent for coordination and useless for one question — what will this feel like to walk through?

First-person navigation answers it, and it answers a few more practical ones along the way. The door that swings into a column. The corridor that is technically wide enough and feels like a tunnel. The ceiling that drops to 2.1 metres for no visible reason. All of these are obvious at eye height and nearly invisible from above.

How walking works

Keyboard controls for walking through an IFC model in first person: G to enter walk mode, W A S D to move, mouse to look, double-click to go — Walk mode controls: G to start, WASD to move, the mouse to look around, double-click a floor to go there at eye height.

Action	Control
Enter or leave walk mode	G
Move	W A S D or the arrow keys
Look around	Mouse (click the view to capture the cursor)
Change speed	Mouse wheel while walking
Go to a spot	Double-click a floor — the camera glides there at 1.65 m above the surface

With the cursor captured, a crosshair marks the centre of the view, and that is where clicks land: selecting an element while walking picks what you are looking at, not where the mouse was when you started.

Why there is no collision

Games stop you at walls. A model review should not. When you are checking a building you usually want to step into the next room to look at the other side of a partition, not search for the door. And collision on a large IFC means querying geometry on every frame, which costs exactly the smoothness that makes walking useful.

What walking finds that orbiting misses

Door swings that clash with furniture, columns or each other.
Headroom under stairs, beams and ductwork.
Sightlines — whether the reception desk can see the entrance.
Wayfinding — whether the route to the stair is obvious from the lift lobby.
Proportion — rooms that meet the area requirement and still feel wrong.

When you find something, measure it on the spot — how to measure an IFC model online — and raise it as a BCF issue with the viewpoint you are standing in.

From a walk to something you can send

A live walk is a review. For a client, the same path recorded as a short video is usually more persuasive than any rendering. Turning a recording into an edited MP4 with titles, sized for the platform it will be watched on, is covered in turning an IFC model into a video.

Walk Through an IFC Model in First Person, in the Browser