Forums >> Revit Building >> Technical Support >> Linked CAD site plan appears 'crushed' in Revit

iamian33

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Joined: Tue, Nov 17, 2009
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RAC 2013

This is hard to describe, so bare with me ... I need to link a CAD site plan into my model but when it is linked, the CAD file appears 'on end'. Everything in the CAD file has been 'crushed' to appear flat, with the exception of the text and many of the blocks.

The CAD file, on it's own is fine and shows no issue within autocad. The UCS = World, Units = millimeters. I suspect that an error has creeped into our CAD files from the Civil engineers system.

I have had limited success with detaching the xref's and copying the cad elements into a new DWG file. However this doesn't always work. Even if it does, it would result in a CAD background that is not updated/current in my model. My hope is that there is a system variable in CAD that can correct this issue. At the very least, a reasonable workflow that will allow me to update my site background in my Revit model.  Please see the attached image and CAD file, I hope it is clear.

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Ian Shafer

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True North S&F Consultants

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WWHub

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Joined: Tue, May 16, 2006
13079 Posts

Perhaps you imported from the wrong view.

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iamian33

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thank you for your response. I'm not sure how the view type would affect this kind of distortionin a linked cad view I have tried a variety of plan and 3D views. What type of view might you suggest WW? The cad file is not actually on end, in 3D the distortion still exists. 

Any other thoughts?

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Ian Shafer

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True North S&F Consultants

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This is not exploded CAD?

First, CAD can be imported in any view and the orientation is then dependent on the current view's work plane.

When you import CAD, you have the option check box of showing it in all views.  When you check that box, the CAD becomes 3D linework in essence.   If you un-check the box, the CAD acts like 2D linework and is only in the view it was imported in.

I don't know what you are showing us with the PDF.  I assume that is a plan view but I don't know what is CAD or what is model.  You know but you don't explain. 

I won't open your DWG.... A PDF of the DWG would have been better.

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iamian33

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Thank you for your extensive explaination.  To clarify, the LINKED CAD file appears distorted, as if it has been 'cushed' flat.  The files attached are:

• another image of the crushed cad file along side the topo created from a previous (successful) cad link.
• a 3D view of the same crushed cad file and toposurface, showing that the distortion is extensive
• a PDF of the autocad screen for WW's viewing, as requested
• the CAD file (DWG), incase someone wants to see the issue for themselves.

In order to see the current site in my model, I have had to

• bind all xref's
• explode all blocks
• purge and audit
• delete all unnecessary layers (usual M.O.)
• wblock the relevant site stuff to a new cad file.

Now the cad like appears properly - but the processing was a royal pain.  I still get the warning that the extents of the cad is greater that 1E9, but the file appears. 

I still believe that there is a variable in the cad file that is messed up.  If anyone can offer a useful perspective, I'd be most grateful. 

-----------------------------------

Ian Shafer

Principal Consultant

True North S&F Consultants

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