Maintaining the Link between Autodesk Revit and Autodesk VIZ:

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When you decide to make changes to your Revit design, you can export the edited design to the same DWG file you used previously. This way, changes to the DWG will be recognized by the File Link Manager in Autodesk VIZ.

Change the Revit design:

Start Autodesk Revit 7 if it is not already running.
Make sure the detached_garage.rvt file you used earlier is opened.
In the Project Browser window, under Floor Plans, double-click on Ground. The view changes to a top view.
Select the door on the left wall.

Notice the door is 3’-0” away from the garage entrance wall and 21’-0” away from the back wall. You are going to invert that.
Click once on the 3’-0” dimension label to edit it.
Type in a value of 21, and then press Enter.

The door is now 3’ away from the back wall.
Select the planter object outside the left wall.

It is presently 11’-0” away from the back wall.
Click once to select the 11’-0” dimension label.
Type in a value of 20, and then press Enter. The planter is now closer to the front wall. On the main toolbar, click the 3D button to revert back to a 3D view.
From the File menu, choose Export and choose the option, DWG, DXF, DGN from the cascading menu.
In the dialog that appears, ensure the Save as type option is set to AutoCAD 2004 DWG Files.
Browse to the location on your hard drive where you saved detached_garage.dwg earlier.
Select that file and then click Save.

A warning box appears.
Answer Yes to overwrite the existing DWG file.

Reload the scene in Autodesk VIZ:

In Autodesk VIZ, go to the File pull-down menu and choose File Link Manager.

On the Files panel, notice the red flag that appears informing you that the linked file has changed.
On the Files panel, make sure the Show Reload Options check box is active.
Click the Reload button. From the dialog that appears, go to the Advanced tab.
Turn on Use Scene Material Definitions and Use Scene Material Assignments on Reload.

These two options ensure that any editing of materials in Autodesk VIZ is retained.
Click OK to reload the updated Revit design. The positions of the door and planter are updated, but their materials still retain the changes made in the Material Editor.
Render the scene to view the results.