Am I missing something because I can't display my contour lines in the Model viewer?
You can display the surface if the triangles are on, but you can't see the contours and if you turn off the triangles you see nothing. You can see them in the older object viewer.
The model viewer is probably just getting started. It is also missing the Realistic View and a couple other that the object viewer has available. I suspect the MV capabilities will advance further as we go along.
Wish item: Add the ability to show featureline PI's & EP's grips in the model Viewer when selected in plan view
