Verify Your Export in 3D Before It Ever Reaches Revit

1. Load your .3dm into the Rhino → Revit tool and set the layer mapping as usual.
2. Watch the Pre-export review panel ("What you'll actually get in Revit"). It re-runs automatically a moment after every mapping change — a dry run of the same extraction the export uses, so it shows real results, not guesses.
3. If the panel shows the green Everything maps cleanly to the types you chose — ready to export message, you can export immediately.
4. Fix anything under Needs attention (red) first — these are mapped layers that will produce zero elements, usually a mistake:
   • "the geometry is flat — there's no height to build from": the layer holds 2D outlines; remap it or extrude the geometry in Rhino.
   • "this layer is mostly curves — no solid to build from": walls, floors and openings need breps/extrusions/meshes, not curves.
5. Read the amber Auto-adjusted to fit Revit list — objects that will import as a different type than you mapped (e.g. a squat solid on a wall layer coming in as Column or Mass), each with the reason.
   • Click Show on a row to open the 3D preview framed on exactly those objects.
6. Open the 3D preview (click Show on its header). The model is colored by final resolved type — the legend at the bottom lists only the types actually in use.
7. Orbit and scan for color mistakes: an object drawn in the wrong color is a misclassification you are about to ship to Revit.
8. Click any object to override it individually. A menu appears — On "‹layer›" — import as: with Wall / Column / Mass / Floor / Beam / Skip:
   • Pick the correct type; the object recolors instantly and the review re-runs.
   • Choosing Wall forces wall — it stays a wall even where the geometry checks would auto-reclassify it.
   • Skip drops just that object while the rest of its layer still exports.
9. Made a wrong override? Click the object again and choose Use layer default to clear it.
10. When the review is green (or every remaining amber row is intentional), click Download for Revit — the export uses exactly the overrides and mapping you just verified.

Note: The dry run executes the identical classification code as the export, so what you see colored in the preview is what Revit will build — five minutes of clicking here replaces the delete-everything-and-reimport cycle that eats studio afternoons.

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Taught in

• New for 2026 — first taught in BIM + Computational Workflow 2026. See also the Rhino2Revit tutorial.