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This is 2026.9 preview documentation. Coverage here is incremental: a page exists only where 2026.9 differs or is newly documented.
This page is the mechanical path onto 2026.9 model placement. For Apply Transform, the placement picker, and the placement record, see Revit in 2026.9. For install, sign-in, publish, and load in today’s connector, see How to use Speckle for Revit.

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When to switch

Existing v3 models keep working. Re-publish from a 2026.9 connector if you need the viewer placement picker and named datums. Scripts and SDK consumers that read referencePointTransform on the root object must switch to modelPlacement.*.

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Before and after

v3 connectors that read 2026.9 models get the old root-object transform rebuilt from the placement record. When a 2026.9 consumer reads a v3 model, the old root transform is migrated into a placement record, but the datum kind cannot be recovered.

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How to switch

1

Update the Revit connector

Use a 2026.9 Revit connector. You should see Apply Transform next to Reference Point in publish settings.
2

Publish a new version

Leave Apply Transform off, then publish as usual. You should see a new version on the model.
Keep Apply Transform off unless a downstream tool that does not understand model placements needs the geometry pre-positioned.

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Scripts and SDK consumers

Assume the model is already in scope.
  1. Read modelPlacement.* from eav.model.
  2. Apply modelPlacement.transform. The value is 16 row-major doubles. Translation is expressed in modelPlacement.units.
  3. If modelPlacement.appliedToGeometry is true, invert that transform before you place the model. Do this regardless of the receive datum.
  4. Then apply the receive datum you want, if it is not Source.
AutoCAD and Civil 3D follow the same contract.

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FAQ

It is not the placement record in 2026.9. Read modelPlacement.* from eav.model. See Placement record.
Invert modelPlacement.transform before you place the model, then apply your receive datum. Revit does this automatically. A custom consumer must do the same.
No. They keep working. 2026.9 consumers rebuild a placement record from the old root transform. Re-publish once from a 2026.9 connector if you need the viewer placement picker and named datums.
Report it with the model URL and the publish and receive settings on both sides. The viewer’s placement overlay shows world origin, model origin, and each reference point.
Last modified on September 2, 2026