Forums >> Revit Building >> Technical Support >> Weird Graphics Issues

JHARevit

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Joined: Fri, May 6, 2016
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I was creating a detail (drafting view) and imported the CAD I had of a fire extinguisher to save myself totally recreating it in Revit.  That import seemed to corrupt the drafting view, though it is not guaranteed to be the cause.  I've been through my whole machine and it is not a hardware issue.  The file opened in other versions of Revit displays the same.  The file opened on other machines entirely displays the same.  The other views (within the same project file) and other files do not share the same issue, it is only the particular drafting view.  If I import the affected view into a new clean file, the issue remains.

The issue is that all arcs get graphically depicted as randomized segments that vary as you zoom in and out.  Same goes for filled region boundaries in edit mode.  The problem is that editing this is extremely difficult as where the program displays the line is not at all where the program snaps the lines to.  It's a guessing game to know if you're connecting to the right place or even selecting the right lines.  I've attached photos of an arc and region boundary lines.  All photos are of the same items, the variations are simply do to a change in the zoom.  The shaded area of the "Offset Lines and Arc" is the actual boundary, so the line showing above and below are the offsets I'm speaking of.

Is there any way of saving this drafting view or do I have to start from total scratch?  Does anyone know what/why this is so as to avoid it in the future?  It would be a shame to never import ANY cad out of fear of destroying segments of work.

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Beaucoupnice

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Joined: Mon, Nov 19, 2007
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DWGs and Revit really dont get along.This issue normally happens when the lines in the DWG are a long way away from 0,0,0.

Try shifting them as close as possible to 0,0,0 in AutoCAD and try changing all the linework to a single layer "0", then purge and audie the DWG.

Then reimport it back into Revit.

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__________I'm the guy they come to when they didn't follow my recommended workflows.__________

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WWHub

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Joined: Tue, May 16, 2006
13079 Posts

I don't think the images posted match the description you give.  Sure doesn't look like a fire extinguisher.

Many of us have cautioned users about importing and exploding CAD - just too many negatives.  It's always better to import/explode the CAD in a junk project to clean everything up before importing into your valuable project.

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JHARevit

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Joined: Fri, May 6, 2016
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The images are of the wall base of the extinguisher cabinet section.  It is the most obvious curve to display the issue, though all curved lines and regions within the detail show the same anomolies.  The wall base is a detail group.  And if I copy that exact same detail group into another drafting view it displays just fine.

It's quite sad to learn that an Autodesk product is generally incompatible with an Autodesk product...so much for an easy change over...

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JHARevit

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Joined: Fri, May 6, 2016
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I just spoke with Revit technical support.  As soon as I finished explaining he said what I've feared.  The detail view is eternally corrupt.  No chance to save it.  Start over.

Soooo, to second WWHub and share the Revit Support Technician, DON'T IMPORT CAD INTO REVIT!!.  You can link it and trace over, but DON'T use the "select line" option as it may also corrupt the detail if the CAD linework isn't to Revit's liking...

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WWHub

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Joined: Tue, May 16, 2006
13079 Posts

It may help you to understand why these problems exist.  Revit was NOT created by Autodesk, they bought it.  I have Revit 3.1 (copyright 2001) setting on my desk which I did not install at the time because I was using CAD.  It was developed by the Revit Technology Corporation.  As such, the way Revit handles primitives like lines, arcs etc is completely different from CAD.  Revit liks elements to be parallel or at a defined angle from a reference.  AutoCAD keeps track of lines by two endpoints with those each being defined with a value 00.xxxx? decimal places and it doesn't care about parallel or angles from a base ponit.  Also, Revits internal base point is nothing like AutoCADS and it doesn't use a 'UCS'. 

Although AutoCAD's system is great for precise engineering, Revit's system seems to be far superior for the work it is intended for.

It is furstrating some times, especially at the beginning but later on, CAD's complexity and inabilities will frustrate you even more.

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