Revit To Lumion Bridge” – free add-in for Revit

Export your models
from Autodesk Revit

Get “Revit To Lumion Bridge” – free add-in for Revit.

This allows you to save your model in a format that Lumion can directly read.
After installing it, it is available in Revit’s default {3D} view via:
Add-ins tab -> External tools -> Revit To Lumion Bridge

Revit To Lumion Bridge

Revit To Lumion Bridge (v1.1) – for Autodesk Revit 2015.
Revit To Lumion Bridge (v1.1) – for Autodesk Revit 2014.
If you want to try new beta version of Revit To Lumion Bridge, you can find it here.

Legacy COLLADA exporter

Download Revit 2014 COLLADA exporter (v2.12).
Download Revit 2013 COLLADA exporter (v2.12).
Download Revit 2012 COLLADA exporter (v2.12).

Warning: Add-in doesn’t work with Autodesk Revit LT versions.

Source: http://lumion3d.com/