Workflow and Site Modeling - Autodesk Revit Architecture 2015 Essentials - page 307

6. Click the Toposurface button on the Massing & Site tab in the ribbon.

7. In the Tools panel on the Modify | Edit Surface tab, select Create
From Import and then choose Select Import Instance.

8. Click the linked CAD file, and the Add Points From Selected Layers
dialog box appears (Figure 13.8).

9. Click the Check None button, and then select the layers
C-TOPO-MAJR and C-TOPO-MINR.

▶

All of the active layers
in your CAD file will
appear in this dialog
box. To ensure that
your CAD file will be
usable for a 3D topo-
surface, isolate and
rename the contour
lines as their own
linetype within the
CAD file.

FIgUre 13.8 Select only the layers
containing 3D contour information.

10. Click OK to close the dialog box. Revit Architecture may take a few
seconds to generate the points based on the contour polylines in the
linked file, but they will appear as black squares when they have all
been placed.

11. If you want to use fewer points to define the toposurface, click the
Simplify Surface button in the contextual ribbon, and enter a larger
value such as 1 ′ - 0 ″ ( 300 mm), and click OK.

12. Click the Finish Surface button in the contextual ribbon to complete
the toposurface. Change the visual style of the view to Consistent
Colors to examine your results.

Upon completion, your toposurface should resemble c13-ex13.1end.rvt file,
available for download from the topic's web page.