Preparing IFC Room Context

ClashWise Plan mode and room assignment use an IFC context model that is uploaded once, attached to a clash set, designated to provide rooms and levels, and aligned with the clash scene.

IFC is the semantic source in this release. A GLB can provide geometry, but it does not provide room or level identity.

Before you start

Your organization must allow web context-model upload.
Uploading model context requires the plan shown by the current organization settings.
Use a synthetic or approved IFC whose IfcBuilding, IfcBuildingStorey, and IfcSpace relationships are populated.
The IFC and clash geometry need a common alignment you can verify visually.

Upload the IFC

Open Model library.
Choose Upload model and select the IFC.
Leave the page open while the direct upload completes, or resume the pending upload if prompted.
Wait for geometry conversion to reach Ready. You can continue using an older active version while a replacement shows Ready · updating.
Use View to inspect the generated preview. A loading state is normal while the image is prepared from the converted context bounds.

If conversion fails, use Retry. Replacing a model creates a new revision; the older spatial derivative becomes stale immediately.

Attach it to a clash set

Open the clash set in the 3D viewer.
Open the context models panel and choose Add / Add model context.
Add the ready IFC.
Tick Provides rooms and levels.
Wait for Rooms ready. While processing, the attachment shows Preparing rooms…. If room extraction fails, use Retry.

Geometry stays usable even if room extraction fails, but Plan/room assignment is not ready.

Align the model

Expand the uploaded model's appearance/alignment controls in the viewer:

choose a nudge step;
move east/west, north/south, and up/down;
rotate around the vertical axis;
adjust scale only when the source units genuinely require it; and
use Fit as a starting aid, then verify known geometry.

Uploaded models are aligned by hand and may be shared across sets. Navisworks-published context is already in the clash coordinate frame and does not expose these controls.

Room assignment occurs only for a ready, aligned spatial attachment. Changing alignment, spatial role, or source revision queues location recomputation. Verify at least one known clash centre in a known room before relying on spatial filters.

Verify Plan and assignment

Choose the intended building and level.
Switch from 3D to Plan.
Confirm room fills/outlines, labels, grids, and clash pins align with the clipped context.
Select a room and choose Review this space.
Open a known clash and inspect its building, level, room/space, source, confidence, and anchor.
Return to 3D and confirm the same room remains selected.

ClashWise uses the exact clash centre when available, then the saved viewpoint anchor, then a bounding-box fallback. It tests that point against room polygons and vertical ranges. It does not choose the nearest room.

Troubleshooting

Provides rooms and levels is missing — only IFC attachments expose the semantic-room role.
Preparing rooms… does not finish — refresh the attachment state; if it failed, choose Retry.
Plan is empty — confirm Rooms ready, the selected building/level, and the attachment's alignment.
Pins are offset — correct the uploaded model transform, then allow locations to recompute.
A clash has no room — verify its anchor is actually inside the room boundary and vertical range. An unknown result is preferable to a guessed room.
The replacement looks correct but rooms are stale — wait for the new revision's spatial derivative to become ready.