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Forums >> Revit Building >> Technical Support >> Toposurface triangulation of imported CAD

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Thu, Jul 18, 2013 at 9:55:31 AM | Toposurface triangulation of imported CAD




Joined: Mon, Apr 15, 2013
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Hello, first time poster but I've been lurking a while so thanks for all the tips I've used so far.

I'm having an issue with the toposurface generation when I import a CAD file into Revit 2013. We are receiving Civil files of the ground surface with just triangles from the engineer for import purposes, when opened in autocad or sketchup it shows as a reasonably clean mesh with drops at kerb edges and flat footpaths with slopes to sides (see image 1). However no matter what format I bring this information into Revit with, when converted to a toposurface Revit triangulates the points quite poorly, creating jagged edges at kerbs and connecting points across footpaths roads etc. such that sharp mounds and dips appear in the surfaces (see image 2). I appreciate it should be possible to correct the mesh by editing the points in the toposurface, this is too time consuming though given that I already have a correct mesh! Another problem with editing the toposurface is that not all of the original points appear for editing (see image 3), especially when working with subregions- I would have to add new points which would diverge from the original design intent of the Civil file. 

Is there any kind of plugin/import process/workaround that might help with this? Is there any easy way to edit the way points triangulate to each other as you might in sketchup?


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Thu, Jul 18, 2013 at 12:12:11 PM | Toposurface triangulation of imported CAD



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Joined: Tue, May 16, 2006
13079 Posts
3.5 Stars: 362 Votes

Revit can only work with what you give it - in this case - points.  It will always triangulate between every two adjacent points.  If that is not what you want, you have to add another point to control the surface.  (that's what you are really doing in sketchup - modifying the surface).


If a point does not show up - its not there!  Someone cheated in the CAD model.


If you really want to correctly model curbs, the surface needs to be split at the curb line and the correct point has to be at the bottom of the curb on one side and the top on the other.

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