Some users have reported that when they tried to import/link a dwg/dxf file representing the property boundary (where one of the boundary is accurately measured with 90 degrees, 0 minutes and 30 something seconds; or there is a deviation of 3/8” over the length of the site) provided by the property surveyor, Revit will treat and round up those angles as exactly 90 degrees.
They would like to know how they might set up their models to account for this level of accuracy, or explain the thinking behind this rounding up by Revit.
Here is the technical explanation.
Revit requires almost-vertical and almost-parallel lines (where "almost" is defined as 0.02 degree off or something like that) to be made exactly vertical or horizontal in order for our Geometry engine to work properly. This code applies to the imported lines as well. That’s why when importing a DWG/DXF with “almost orthogonal” or “very sharp angle” line, Revit will somehow “straighten” it for the Geometry engine purposes.
For now, here is a workaround that for users to input exactly the 90 degrees, 0 minutes and 30 something seconds:
1- Import the DWG/DXF in Revit (yes, I know that some of “almost orthogonal” line will become “straightened”)
2- Go to Site > Property Line > Create property lines by sketching
3- In sketch mode, use Pick Lines tool and select all the imported DXF lines.
4- Finish sketch
5- Click on the Revit generated Property Line and then on the option bar Edit Table
6- Now you can do the adjustment by inputting/adding back the 30 something seconds into the original “almost orthogonal” line. (See below jpgs)
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Iam still having problems when importing a dwg to revit 8. I get the following responce "no valid elements detected try to set 'proxygrahics to 1'
Posted by: Meshack | November 27, 2008 at 11:18 PM