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Site Survey CAD Import Distorted

34 ANTWORTEN 34
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Nachricht 1 von 35
Anonymous
3362 Aufrufe, 34 Antworten

Site Survey CAD Import Distorted

Hello,

I recieved a DWG file from a civil engineer so I could update my Revit model site. The CAD file looks perfectly fine in Autocad. Lines that are supposed to be parallel and perpendicular look perfectly fine. But when I link to my model, lines seem distorted in the X axis. It won't let me align or dimension between CAD and Revit elements because it doesn't read these lines as parallel. I've tried everything I can think of in Autocad. I'm not sure the original software used to create the site survey before they converted to CAD. Not sure what else to add.........

34 ANTWORTEN 34
Nachricht 2 von 35
barthbradley
als Antwort auf: Anonymous

sounds like the CAD is far away from the Internal Origin in Revit. 

Nachricht 3 von 35
Anonymous
als Antwort auf: barthbradley

Is there any way to fix this?

Nachricht 4 von 35
ennujozlagam
als Antwort auf: Anonymous

have you try to set your autocad file VIEWRES to 20000 and untick correct lines that are slightly off axis and check your ddunits in autocad and revit if they are the same and see if helps. thanks

 

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Nachricht 5 von 35
barthbradley
als Antwort auf: Anonymous

First, let's verify. Is the CAD far away from the IO? 

Nachricht 6 von 35
Anonymous
als Antwort auf: barthbradley

It seems to be pretty far away.

Nachricht 7 von 35
barthbradley
als Antwort auf: Anonymous

Okay, it sounds like I hit the nail on the head.  You simply need to unpin and move the CAD to the right position/orientation relative to your Revit model.  Do you have any known/fixed coordinates you can work with to achieve this, or are you just eyeballing placement?  

Nachricht 8 von 35
Anonymous
als Antwort auf: barthbradley

I have a plan view CAD export from my model I used the origin from that to move the CAD more in alignment. Re imported trying both with the "correct lines etc" checked and unchecked. The problem persists. 

Nachricht 9 von 35
barthbradley
als Antwort auf: Anonymous


@Anonymous wrote:

I have a plan view CAD export from my model I used the origin from that to move the CAD more in alignment. Re imported trying both with the "correct lines etc" checked and unchecked. The problem persists. 


 

I have no idea what this means.  Bottom line is that Revit has a distance limit. If you have elements placed more than 10 miles from the Internal Origin, you can experience issues such as you are describing.  The remedy is to move those element closer to the IO.  

 

Here's some literature on the subject:

 

https://knowledge.autodesk.com/support/revit-products/learn-explore/caas/CloudHelp/cloudhelp/2018/ENU/Revit-Model/files/GUID-3F79BF5A-F051-49F3-951E-D3E86F51BECC-htm.html

Nachricht 10 von 35
_Vijay
als Antwort auf: Anonymous

Can you show some images?

Nachricht 11 von 35
Anonymous
als Antwort auf: barthbradley

I tried matching the origin point in the CAD file base don the Revit origin point. When you say move closer. I have my CAD directly over my model so I can trace, align, etc from the CAD overlay. So I'm not following you. These 2 elements are as close as one can get them.

Nachricht 12 von 35
Anonymous
als Antwort auf: _Vijay

The cyan lines look perfectly stright in CAD and read as either 0, 90, 270 degrees etc in CAD. When linking to Revit the come in angled. So if I try tracing over them in Revit. They become distorted like that. The black lines are my Revit in place family.

Nachricht 13 von 35
barthbradley
als Antwort auf: Anonymous


@Anonymous wrote:

I tried matching the origin point in the CAD file base don the Revit origin point. When you say move closer. I have my CAD directly over my model so I can trace, align, etc from the CAD overlay. So I'm not following you. These 2 elements are as close as one can get them.


 

Go to a 3D view and Zoom to Fit, and then, under VGOs, check Site: Internal Origin, Site: Project Base Point and Site: Survey Point. Now examine the view and tell me where the CAD is located in relationship to these 3 points.  

Nachricht 14 von 35
barthbradley
als Antwort auf: Anonymous


@Anonymous wrote:

The cyan lines look perfectly stright in CAD and read as either 0, 90, 270 degrees etc in CAD. When linking to Revit the come in angled. So if I try tracing over them in Revit. They become distorted like that. The black lines are my Revit in place family.


 

Sounds like you are tracing on the wrong Workplane. That is, the Workplane you are tracing on is not parallel to the Workplane of the imported CAD linework.  

Nachricht 15 von 35
Anonymous
als Antwort auf: barthbradley

591 ft.

Nachricht 16 von 35
barthbradley
als Antwort auf: Anonymous


@Anonymous wrote:

591 ft.


 

That's nothing. 

 

Can you post any illustrations showing what you are talking about?   

Nachricht 17 von 35
Anonymous
als Antwort auf: barthbradley

Never seen that happen before and I've linked CAD files hundreds of times. Is there a way to confirm/fix this?

Nachricht 18 von 35
barthbradley
als Antwort auf: Anonymous


@Anonymous wrote:

Never seen that happen before and I've linked CAD files hundreds of times. Is there a way to confirm/fix this?


 

Great!  Then we should be able to figure this out.  I just need some help understanding the issue. Pictures would help immensely.  

Nachricht 19 von 35
Anonymous
als Antwort auf: barthbradley

First image (blue lines) is the CAD. Second image (cyan lines) are what the blue lines look like when linked.

Nachricht 20 von 35
ToanDN
als Antwort auf: Anonymous

Open the CAD file, thaw all layers, zoom extent. What do you see?

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