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Joined: Mon, Aug 4, 2008
153 Posts
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Here are the tips for how to create topo surface from imported AutoCAD file and work on it (Revit 2013).
1. You need to do some preparations in AutoCAD first.
A. If your CAD file is a 2D, (if it’s a 3D then go to item B).
a. Turn-off or Lock all layers, just have those Mjr (Major contour lines), and Mnr (Minor contour lines) layers can be seen or modified.
b. Assign the Z-coordinates to each contour line accordingly.
B. Check the base point of the file (origin), if the origin is couple thousand feet or miles away from you project area.
a. Draw a line on a unique layer, such as Non-Print-Origin, from an existing building corner, or a known point on survey (which will be your project origin), to base origin 0,0 (which is CAD survey origin). This way the site contractor will able to re-place the site file back to original topo-survey coordinates during construction.
b. Turn-on, thaw, un-lock all layers, select everything and use your project origin as the base point, then move everything to 0,0. This way when you insert the CAD file into Revit, that project origin will be set at Revit base point.
In Revit:
2. Open a new project with “Site” view under Revit “Floor Plans” views, set your view range cut plane above the highest point in toposurvey.
3. Use “Insert” to link the CAD file into your Revit project. In pop-up window “Link CAD Formats” window, change the Positioning to “Auto – Origin to Origin”, and open the selected file. Then you will see the CAD topo.
4. In “Massing & Site”, click the arrow at the lower right corner of “Model Site”, you can set up your preferred “Site Settings”, then click “Toposurface”, in “Tools” under “Modify | Edit Surface” select “Create from Import”, click “Select Import Instance”, then select the CAD topo, a pop-up window “Add Points from Selected Layers” will show, check layers “Cont-Mjr” and “Cont-Mnr” only, then check “OK”. In “Graphic display options” change to “Shaded”, now you can see the new toposurface. You can go to “Manage Links”, in “CAD Formats”, unload the CAD file if you like.
5. In “View”, click “Visibility/Graphics”, scroll down to “Topography”, double click “Primary” or “Secondary” contour lines, you can change the color and line type as you like. Now you have your Revit toposurface.
6. There are several ways to create new grade, I’m only showing the way by “Split Surface”. Click “Split Surface” in “Modify Site” panel, select the toposurface you just got from the CAD. Suppose that has a gentle slop from northwest toward southeast, draw a 80’ x 80’ square box in the center of the toposurface, we call it TS-A, now you have another one TS-B.
7. Pick TS-B, click “Edit Surface”, you will see lots of points in TS-B, select all and in “Properties” change them to about 2 feet higher than the existing grade, for example 20’-0”, then click green check mark in “Surface” panel. You can go to 3D view see the changes. These two surface TS-A and TS-B has a gap in between.
8. Now select TS-A, click “Edit Surface”, you will see lots of points in TS-A, select points about 5’-0” adjacent to TS-B, by using window, you will see those selected points turn to blue dots, and change those elevations to the one you set in step 7. and “Selection” panel showed up in your ribbon area, now click “Filter”, un-check “Interior Points”, then click green check mark in “Surface” panel. Go to 3D view, now you can see your new very rough grading plan. After those steps, now you have to do lots of calculations and moving points, and changing elevations to achieve what your desired final grading plan.
Here are some links for more info.
http://www.revitcity.com/forums.php?action=viewthread&thread_id=27733
http://www.youtube.com/watch?v=_K1zvaiymn4
Edited on: Sun, Jun 9, 2013 at 11:46:23 PM
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